added the game

addons/better-terrain/BetterTerrain.cs

@@ -0,0 +1,258 @@
+using Godot;
+using Godot.Collections;
+
+#nullable disable
+
+/*
+
+This is a lightweight wrapper for Better Terrain in C#.
+
+It is not a C# implementation, it merely provides a type safe interface to access
+the BetterTerrain autoload from C#. If you are not using Godot in C#, you can ignore
+this file.
+
+The interface is created for a specific tilemap node, which it uses to locate the
+autoload, and to fill in as a parameter to simplify all the subsequent calls.
+Very simple example:
+
+```
+    BetterTerrain betterTerrain;
+
+    public override void _Ready()
+    {
+        TileMapLayer tileMapLayer = GetNode<TileMapLayer>("TileMapLayer");
+        betterTerrain = new BetterTerrain(tm);
+
+        var coordinates = new Vector2I(0, 0);
+        betterTerrain.SetCell(coordinates, 1);
+        betterTerrain.UpdateTerrainCell(coordinates);
+    }
+```
+
+The functions available are the same as BetterTerrain's, though the TileMapLayer or
+TileSet parameters are automatically filled in. The help is not duplicated here,
+refer to the GDScript version for specifics.
+
+*/
+
+public class BetterTerrain
+{
+    public enum TerrainType
+    {
+        MatchTiles = 0,
+        MatchVertices = 1,
+        Category = 2,
+        Decoration = 3
+    }
+
+    public enum SymmetryType
+    {
+        None = 0,
+        Mirror = 1, // Horizontally mirror
+        Flip = 2, // Vertically flip
+        Reflect = 3, // All four reflections
+        RotateClockwise = 4,
+        RotateCounterClockwise = 5,
+        Rotate180 = 6,
+        RotateAll = 7, // All four rotated forms
+        All = 8 // All rotated and reflected forms
+    }
+
+    private static readonly NodePath nodePath = new("/root/BetterTerrain");
+    private readonly Node betterTerrain;
+    private readonly TileMapLayer tileMapLayer;
+
+    public BetterTerrain(TileMapLayer tileMapLayer)
+    {
+        this.tileMapLayer = tileMapLayer;
+        betterTerrain = tileMapLayer.GetNode(nodePath);
+    }
+
+    public Array<Godot.Collections.Dictionary<string, Variant>> GetTerrainCategories()
+    {
+        return (Array<Godot.Collections.Dictionary<string, Variant>>)betterTerrain.Call(MethodName.GetTerrainCategories, tileMapLayer.TileSet);
+    }
+
+    public bool AddTerrain(string name, Color color, TerrainType type, Array<int> categories = null, Godot.Collections.Dictionary<Variant, Variant> icon = null)
+    {
+        categories ??= new Array<int>();
+        icon ??= new Godot.Collections.Dictionary<Variant, Variant>();
+        return (bool)betterTerrain.Call(MethodName.AddTerrain, tileMapLayer.TileSet, name, color, (int)type, categories, icon);
+    }
+
+    public bool RemoveTerrain(int index)
+    {
+        return (bool)betterTerrain.Call(MethodName.RemoveTerrain, tileMapLayer.TileSet, index);
+    }
+
+    public int TerrainCount()
+    {
+        return (int)betterTerrain.Call(MethodName.TerrainCount, tileMapLayer.TileSet);
+    }
+
+    public Godot.Collections.Dictionary<string, Variant> GetTerrain(int index)
+    {
+        return (Godot.Collections.Dictionary<string, Variant>)betterTerrain.Call(MethodName.GetTerrain, tileMapLayer.TileSet, index);
+    }
+
+    public bool SetTerrain(int index, string name, Color color, TerrainType type, Array<int> categories = null, Godot.Collections.Dictionary<Variant, Variant> icon = null)
+    {
+        categories ??= new Array<int>();
+        icon ??= new Godot.Collections.Dictionary<Variant, Variant>();
+        return (bool)betterTerrain.Call(MethodName.SetTerrain, tileMapLayer.TileSet, index, name, color, (int)type, categories, icon);
+    }
+
+    public bool SwapTerrains(int index1, int index2)
+    {
+        return (bool)betterTerrain.Call(MethodName.SwapTerrains, tileMapLayer.TileSet, index1, index2);
+    }
+
+    public bool SetTileTerrainType(TileData tileData, int type)
+    {
+        return (bool)betterTerrain.Call(MethodName.SetTileTerrainType, tileMapLayer.TileSet, tileData, type);
+    }
+
+    public int GetTileTerrainType(TileData tileData)
+    {
+        return (int)betterTerrain.Call(MethodName.GetTileTerrainType, tileData);
+    }
+
+    public bool SetTileSymmetryType(TileData tileData, SymmetryType type)
+    {
+        return (bool)betterTerrain.Call(MethodName.SetTileSymmetryType, tileMapLayer.TileSet, tileData, (int)type);
+    }
+
+    public SymmetryType GetTileSymmetryType(TileData tileData)
+    {
+        return (SymmetryType)(int)betterTerrain.Call(MethodName.GetTileSymmetryType, tileData);
+    }
+
+    public Array<TileData> GetTilesInTerrain(int type)
+    {
+        return (Array<TileData>)betterTerrain.Call(MethodName.GetTilesInTerrain, tileMapLayer.TileSet, type);
+    }
+
+    public Array<Godot.Collections.Dictionary<string, Variant>> GetTileSourcesInTerrain(int type)
+    {
+        return (Array<Godot.Collections.Dictionary<string, Variant>>)betterTerrain.Call(MethodName.GetTileSourcesInTerrain, tileMapLayer.TileSet, type);
+    }
+
+    public bool AddTilePeeringType(TileData tileData, TileSet.CellNeighbor peering, int type)
+    {
+        return (bool)betterTerrain.Call(MethodName.AddTilePeeringType, tileMapLayer.TileSet, tileData, (int)peering, type);
+    }
+
+    public bool RemoveTilePeeringType(TileData tileData, TileSet.CellNeighbor peering, int type)
+    {
+        return (bool)betterTerrain.Call(MethodName.RemoveTilePeeringType, tileMapLayer.TileSet, tileData, (int)peering, type);
+    }
+
+    public Array<TileSet.CellNeighbor> TilePeeringKeys(TileData tileData)
+    {
+        return (Array<TileSet.CellNeighbor>)betterTerrain.Call(MethodName.TilePeeringKeys, tileData);
+    }
+
+    public Array<int> TilePeeringTypes(TileData tileData, TileSet.CellNeighbor peering)
+    {
+        return (Array<int>)betterTerrain.Call(MethodName.TilePeeringTypes, tileData, (int)peering);
+    }
+
+    public Array<TileSet.CellNeighbor> TilePeeringForType(TileData tileData, int type)
+    {
+        return (Array<TileSet.CellNeighbor>)betterTerrain.Call(MethodName.TilePeeringForType, tileData, type);
+    }
+
+    public bool SetCell(Vector2I coordinate, int type)
+    {
+        return (bool)betterTerrain.Call(MethodName.SetCell, tileMapLayer, coordinate, type);
+    }
+
+    public bool SetCells(Array<Vector2I> coordinates, int type)
+    {
+        return (bool)betterTerrain.Call(MethodName.SetCells, tileMapLayer, coordinates, type);
+    }
+
+    public bool ReplaceCell(Vector2I coordinate, int type)
+    {
+        return (bool)betterTerrain.Call(MethodName.ReplaceCell, tileMapLayer, coordinate, type);
+    }
+
+    public bool ReplaceCells(Array<Vector2I> coordinates, int type)
+    {
+        return (bool)betterTerrain.Call(MethodName.ReplaceCells, tileMapLayer, coordinates, type);
+    }
+
+    public int GetCell(Vector2I coordinate)
+    {
+        return (int)betterTerrain.Call(MethodName.GetCell, tileMapLayer, coordinate);
+    }
+
+    public void UpdateTerrainCells(Array<Vector2I> cells, bool updateSurroundingCells = true)
+    {
+        betterTerrain.Call(MethodName.UpdateTerrainCells, tileMapLayer, cells, updateSurroundingCells);
+    }
+
+    public void UpdateTerrainCell(Vector2I cell, bool updateSurroundingCells = true)
+    {
+        betterTerrain.Call(MethodName.UpdateTerrainCell, tileMapLayer, cell, updateSurroundingCells);
+    }
+
+    public void UpdateTerrainArea(Rect2I area, bool updateSurroundingCells = true)
+    {
+        betterTerrain.Call(MethodName.UpdateTerrainArea, tileMapLayer, area, updateSurroundingCells);
+    }
+
+    public Godot.Collections.Dictionary<Variant, Variant> CreateTerrainChangeset(Godot.Collections.Dictionary<Vector2I, int> paint)
+    {
+        return (Godot.Collections.Dictionary<Variant, Variant>)betterTerrain.Call(MethodName.CreateTerrainChangeset, tileMapLayer, paint);
+    }
+
+    public bool IsTerrainChangesetReady(Godot.Collections.Dictionary<Variant, Variant> changeset)
+    {
+        return (bool)betterTerrain.Call(MethodName.IsTerrainChangesetReady, changeset);
+    }
+
+    public void WaitForTerrainChangeset(Godot.Collections.Dictionary<Variant, Variant> changeset)
+    {
+        betterTerrain.Call(MethodName.WaitForTerrainChangeset, changeset);
+    }
+
+    public void ApplyTerrainChangeset(Godot.Collections.Dictionary<Variant, Variant> changeset)
+    {
+        betterTerrain.Call(MethodName.ApplyTerrainChangeset, changeset);
+    }
+
+    private static class MethodName
+    {
+        public static readonly StringName GetTerrainCategories = "get_terrain_categories";
+        public static readonly StringName AddTerrain = "add_terrain";
+        public static readonly StringName RemoveTerrain = "remove_terrain";
+        public static readonly StringName TerrainCount = "terrain_count";
+        public static readonly StringName GetTerrain = "get_terrain";
+        public static readonly StringName SetTerrain = "set_terrain";
+        public static readonly StringName SwapTerrains = "swap_terrains";
+        public static readonly StringName SetTileTerrainType = "set_tile_terrain_type";
+        public static readonly StringName GetTileTerrainType = "get_tile_terrain_type";
+        public static readonly StringName SetTileSymmetryType = "set_tile_symmetry_type";
+        public static readonly StringName GetTileSymmetryType = "get_tile_symmetry_type";
+        public static readonly StringName GetTilesInTerrain = "get_tiles_in_terrain";
+        public static readonly StringName GetTileSourcesInTerrain = "get_tile_sources_in_terrain";
+        public static readonly StringName AddTilePeeringType = "add_tile_peering_type";
+        public static readonly StringName RemoveTilePeeringType = "remove_tile_peering_type";
+        public static readonly StringName TilePeeringKeys = "tile_peering_keys";
+        public static readonly StringName TilePeeringTypes = "tile_peering_types";
+        public static readonly StringName TilePeeringForType = "tile_peering_for_type";
+        public static readonly StringName SetCell = "set_cell";
+        public static readonly StringName SetCells = "set_cells";
+        public static readonly StringName ReplaceCell = "replace_cell";
+        public static readonly StringName ReplaceCells = "replace_cells";
+        public static readonly StringName GetCell = "get_cell";
+        public static readonly StringName UpdateTerrainCells = "update_terrain_cells";
+        public static readonly StringName UpdateTerrainCell = "update_terrain_cell";
+        public static readonly StringName UpdateTerrainArea = "update_terrain_area";
+        public static readonly StringName CreateTerrainChangeset = "create_terrain_changeset";
+        public static readonly StringName IsTerrainChangesetReady = "is_terrain_changeset_ready";
+        public static readonly StringName WaitForTerrainChangeset = "wait_for_terrain_changeset";
+        public static readonly StringName ApplyTerrainChangeset = "apply_terrain_changeset";
+    }
+}

addons/better-terrain/BetterTerrain.gd.uid

@@ -0,0 +1 @@
+uid://b5wvl76qnagcj

addons/better-terrain/BetterTerrainData.gd

@@ -0,0 +1,598 @@
+@tool
+
+## Data functions for [TileSet] properties.
+##
+## This data class has functions for retrieving data regarding the mathematical
+## properties of a tile set.
+
+const _terrain_peering_square_tiles : Array[int] = [0, 3, 4, 7, 8, 11, 12, 15]
+const _terrain_peering_square_vertices : Array[int] = [3, 7, 11, 15]
+const _terrain_peering_isometric_tiles : Array[int] = [1, 2, 5, 6, 9, 10, 13, 14]
+const _terrain_peering_isometric_vertices : Array[int] = [1, 5, 9, 13]
+const _terrain_peering_horiztonal_tiles : Array[int] = [0, 2, 6, 8, 10, 14]
+const _terrain_peering_horiztonal_vertices : Array[int] = [3, 5, 7, 11, 13, 15]
+const _terrain_peering_vertical_tiles : Array[int] = [2, 4, 6, 10, 12, 14]
+const _terrain_peering_vertical_vertices : Array[int] = [1, 3, 7, 9, 11, 15]
+const _terrain_peering_non_modifying : Array[int] = []
+
+const _terrain_peering_hflip : Array[int] = [8, 9, 6, 7, 4, 5, 2, 3, 0, 1, 14, 15, 12, 13, 10, 11]
+const _terrain_peering_vflip : Array[int] = [0, 1, 14, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3]
+const _terrain_peering_transpose : Array[int] = [4, 5, 2, 3, 0, 1, 14, 15, 12, 13, 10, 11, 8, 9, 6, 7]
+
+const symmetry_mapping := {
+	BetterTerrain.SymmetryType.NONE: [0],
+	BetterTerrain.SymmetryType.MIRROR: [0, TileSetAtlasSource.TRANSFORM_FLIP_H],
+	BetterTerrain.SymmetryType.FLIP: [0, TileSetAtlasSource.TRANSFORM_FLIP_V],
+	BetterTerrain.SymmetryType.REFLECT: [
+		0,
+		TileSetAtlasSource.TRANSFORM_FLIP_H,
+		TileSetAtlasSource.TRANSFORM_FLIP_V,
+		TileSetAtlasSource.TRANSFORM_FLIP_H | TileSetAtlasSource.TRANSFORM_FLIP_V
+	],
+	BetterTerrain.SymmetryType.ROTATE_CLOCKWISE: [0, TileSetAtlasSource.TRANSFORM_FLIP_H | TileSetAtlasSource.TRANSFORM_TRANSPOSE],
+	BetterTerrain.SymmetryType.ROTATE_COUNTER_CLOCKWISE: [0, TileSetAtlasSource.TRANSFORM_FLIP_V | TileSetAtlasSource.TRANSFORM_TRANSPOSE],
+	BetterTerrain.SymmetryType.ROTATE_180: [0, TileSetAtlasSource.TRANSFORM_FLIP_H | TileSetAtlasSource.TRANSFORM_FLIP_V],
+	BetterTerrain.SymmetryType.ROTATE_ALL: [
+		0,
+		TileSetAtlasSource.TRANSFORM_FLIP_H | TileSetAtlasSource.TRANSFORM_TRANSPOSE,
+		TileSetAtlasSource.TRANSFORM_FLIP_H | TileSetAtlasSource.TRANSFORM_FLIP_V,
+		TileSetAtlasSource.TRANSFORM_FLIP_V | TileSetAtlasSource.TRANSFORM_TRANSPOSE
+	],
+	BetterTerrain.SymmetryType.ALL: [
+		0,
+		TileSetAtlasSource.TRANSFORM_FLIP_H,
+		TileSetAtlasSource.TRANSFORM_FLIP_V,
+		TileSetAtlasSource.TRANSFORM_FLIP_H | TileSetAtlasSource.TRANSFORM_FLIP_V,
+		TileSetAtlasSource.TRANSFORM_TRANSPOSE,
+		TileSetAtlasSource.TRANSFORM_FLIP_H | TileSetAtlasSource.TRANSFORM_TRANSPOSE,
+		TileSetAtlasSource.TRANSFORM_FLIP_V | TileSetAtlasSource.TRANSFORM_TRANSPOSE,
+		TileSetAtlasSource.TRANSFORM_FLIP_H | TileSetAtlasSource.TRANSFORM_FLIP_V | TileSetAtlasSource.TRANSFORM_TRANSPOSE
+	]
+}
+
+
+## Returns an [Array] of ints of type [enum TileSet.CellNeighbor] which represent
+## the valid neighboring tiles for a terrain of [code]type[/code] in TileSet
+static func get_terrain_peering_cells(ts: TileSet, type: int) -> Array[int]:
+	if !ts or type < 0 or type >= BetterTerrain.TerrainType.MAX:
+		return []
+	
+	if type == BetterTerrain.TerrainType.CATEGORY:
+		return _terrain_peering_non_modifying
+	if type == BetterTerrain.TerrainType.DECORATION:
+		type = BetterTerrain.TerrainType.MATCH_TILES
+	
+	match [ts.tile_shape, type]:
+		[TileSet.TILE_SHAPE_SQUARE, BetterTerrain.TerrainType.MATCH_TILES]:
+			return _terrain_peering_square_tiles
+		[TileSet.TILE_SHAPE_SQUARE, BetterTerrain.TerrainType.MATCH_VERTICES]:
+			return _terrain_peering_square_vertices
+		[TileSet.TILE_SHAPE_ISOMETRIC, BetterTerrain.TerrainType.MATCH_TILES]:
+			return _terrain_peering_isometric_tiles
+		[TileSet.TILE_SHAPE_ISOMETRIC, BetterTerrain.TerrainType.MATCH_VERTICES]:
+			return _terrain_peering_isometric_vertices
+	
+	match [ts.tile_offset_axis, type]:
+		[TileSet.TILE_OFFSET_AXIS_VERTICAL, BetterTerrain.TerrainType.MATCH_TILES]:
+			return _terrain_peering_vertical_tiles
+		[TileSet.TILE_OFFSET_AXIS_VERTICAL, BetterTerrain.TerrainType.MATCH_VERTICES]:
+			return _terrain_peering_vertical_vertices
+		[TileSet.TILE_OFFSET_AXIS_HORIZONTAL, BetterTerrain.TerrainType.MATCH_TILES]:
+			return _terrain_peering_horiztonal_tiles
+		[TileSet.TILE_OFFSET_AXIS_HORIZONTAL, BetterTerrain.TerrainType.MATCH_VERTICES]:
+			return _terrain_peering_horiztonal_vertices
+	
+	return []
+
+
+## Returns true if [code]peering[/code] is a valid neighboring cell for a terrain of
+## [code]type[/code] in [TileSet]
+static func is_terrain_peering_cell(ts: TileSet, type: int, peering: int) -> bool:
+	return peering in get_terrain_peering_cells(ts, type)
+
+
+static func _peering_polygon_square_tiles(peering: int) -> PackedVector2Array:
+	const t := 1.0 / 3.0
+	var result : PackedVector2Array
+	match peering:
+		TileSet.CELL_NEIGHBOR_RIGHT_SIDE: result.append(Vector2(2*t, t))
+		TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_CORNER: result.append(Vector2(2*t, 2*t))
+		TileSet.CELL_NEIGHBOR_BOTTOM_SIDE: result.append(Vector2(t, 2*t))
+		TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_CORNER: result.append(Vector2(0, 2*t))
+		TileSet.CELL_NEIGHBOR_LEFT_SIDE: result.append(Vector2(0, t))
+		TileSet.CELL_NEIGHBOR_TOP_LEFT_CORNER: result.append(Vector2(0, 0))
+		TileSet.CELL_NEIGHBOR_TOP_SIDE: result.append(Vector2(t, 0))
+		TileSet.CELL_NEIGHBOR_TOP_RIGHT_CORNER: result.append(Vector2(2*t, 0))
+		-1: result.append(Vector2(t, t))
+	result.append(result[0] + Vector2(t, 0))
+	result.append(result[0] + Vector2(t, t))
+	result.append(result[0] + Vector2(0, t))
+	return result
+
+
+static func _peering_polygon_square_vertices(peering: int) -> PackedVector2Array:
+	const t := 1.0 / 2.0
+	var result : PackedVector2Array
+	match peering:
+		TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_CORNER:
+			result.append(Vector2(1, t))
+			result.append(Vector2(1, 1))
+			result.append(Vector2(t, 1))
+		TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_CORNER:
+			result.append(Vector2(0, t))
+			result.append(Vector2(t, 1))
+			result.append(Vector2(0, 1))
+		TileSet.CELL_NEIGHBOR_TOP_LEFT_CORNER:
+			result.append(Vector2(0, 0))
+			result.append(Vector2(t, 0))
+			result.append(Vector2(0, t))
+		TileSet.CELL_NEIGHBOR_TOP_RIGHT_CORNER:
+			result.append(Vector2(t, 0))
+			result.append(Vector2(1, 0))
+			result.append(Vector2(1, t))
+		-1:
+			result.append(Vector2(t, 0))
+			result.append(Vector2(1, t))
+			result.append(Vector2(t, 1))
+			result.append(Vector2(0, t))
+	return result
+
+
+static func _peering_polygon_isometric_tiles(peering: int) -> PackedVector2Array:
+	const t := 1.0 / 4.0
+	match peering:
+		-1: return PackedVector2Array([Vector2(2 * t, t), Vector2(3 * t, 2 * t), Vector2(2 * t, 3 * t), Vector2(t, 2 * t)])
+		TileSet.CELL_NEIGHBOR_RIGHT_CORNER:
+			return PackedVector2Array([Vector2(3 * t, 2 * t), Vector2(1, t), Vector2(1, 3 * t)])
+		TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_SIDE:
+			return PackedVector2Array([Vector2(3 * t, 2 * t), Vector2(1, 3 * t), Vector2(3 * t, 1), Vector2(2 * t, 3 * t)])
+		TileSet.CELL_NEIGHBOR_BOTTOM_CORNER:
+			return PackedVector2Array([Vector2(2 * t, 3 * t), Vector2(3 * t, 1), Vector2(t, 1)])
+		TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_SIDE:
+			return PackedVector2Array([Vector2(t, 2 * t), Vector2(2 * t, 3 * t), Vector2(t, 1), Vector2(0, 3 * t)])
+		TileSet.CELL_NEIGHBOR_LEFT_CORNER:
+			return PackedVector2Array([Vector2(0, t), Vector2(t, 2 * t), Vector2(0, 3 * t)])
+		TileSet.CELL_NEIGHBOR_TOP_LEFT_SIDE:
+			return PackedVector2Array([Vector2(t, 0), Vector2(2 * t, t), Vector2(t, 2 * t), Vector2(0, t)])
+		TileSet.CELL_NEIGHBOR_TOP_CORNER:
+			return PackedVector2Array([Vector2(t, 0), Vector2(3 * t, 0), Vector2(2 * t, t)])
+		TileSet.CELL_NEIGHBOR_TOP_RIGHT_SIDE:
+			return PackedVector2Array([Vector2(3 * t, 0), Vector2(1, t), Vector2(3 * t, 2 * t), Vector2(2 * t, t)])
+	return PackedVector2Array()
+
+
+static func _peering_polygon_isometric_vertices(peering: int) -> PackedVector2Array:
+	const t := 1.0 / 4.0
+	const ttt := 3.0 * t
+	match peering:
+		-1: return PackedVector2Array([Vector2(t, t), Vector2(ttt, t), Vector2(ttt, ttt), Vector2(t, ttt)])
+		TileSet.CELL_NEIGHBOR_RIGHT_CORNER:
+			return PackedVector2Array([Vector2(ttt, t), Vector2(1, 0), Vector2(1, 1), Vector2(ttt, ttt)])
+		TileSet.CELL_NEIGHBOR_BOTTOM_CORNER:
+			return PackedVector2Array([Vector2(t, ttt), Vector2(ttt, ttt), Vector2(1, 1), Vector2(0, 1)])
+		TileSet.CELL_NEIGHBOR_LEFT_CORNER:
+			return PackedVector2Array([Vector2(0, 0), Vector2(t, t), Vector2(t, ttt), Vector2(0, 1)])
+		TileSet.CELL_NEIGHBOR_TOP_CORNER:
+			return PackedVector2Array([Vector2(0, 0), Vector2(1, 0), Vector2(ttt, t), Vector2(t, t)])
+	return PackedVector2Array()
+
+
+static func _peering_polygon_horizontal_tiles(peering: int) -> PackedVector2Array:
+	const e := 1.0 / (2.0 * sqrt(3.0))
+	const w := sqrt(3.0) / 8.0
+	const t := 1.0 / 2.0
+	const s := 1.0 / 8.0
+	match peering:
+		-1:
+			return PackedVector2Array([
+				Vector2(t, 2 * s),
+				Vector2(t + w, t - s),
+				Vector2(t + w, t + s),
+				Vector2(t, 6 * s),
+				Vector2(t - w, t + s),
+				Vector2(t - w, t - s)
+			])
+		TileSet.CELL_NEIGHBOR_RIGHT_SIDE:
+			return PackedVector2Array([
+				Vector2(t + w, t - s),
+				Vector2(1, t - e),
+				Vector2(1, t + e),
+				Vector2(t + w, t + s)
+			])
+		TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_SIDE:
+			return PackedVector2Array([
+				Vector2(t + w, t + s),
+				Vector2(1, t + e),
+				Vector2(t, 1),
+				Vector2(t, 6 * s)
+			])
+		TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_SIDE:
+			return PackedVector2Array([
+				Vector2(t, 6 * s),
+				Vector2(t, 1),
+				Vector2(0, t + e),
+				Vector2(t - w, t + s)
+			])
+		TileSet.CELL_NEIGHBOR_LEFT_SIDE:
+			return PackedVector2Array([
+				Vector2(t - w, t + s),
+				Vector2(0, t + e),
+				Vector2(0, t - e),
+				Vector2(t - w, t - s)
+			])
+		TileSet.CELL_NEIGHBOR_TOP_LEFT_SIDE:
+			return PackedVector2Array([
+				Vector2(t - w, t - s),
+				Vector2(0, t - e),
+				Vector2(t, 0),
+				Vector2(t, 2 * s)
+			])
+		TileSet.CELL_NEIGHBOR_TOP_RIGHT_SIDE:
+			return PackedVector2Array([
+				Vector2(t, 2 * s),
+				Vector2(t, 0),
+				Vector2(1, t - e),
+				Vector2(t + w, t - s)
+			])
+	return PackedVector2Array()
+
+
+static func _peering_polygon_horizontal_vertices(peering: int) -> PackedVector2Array:
+	const e := 1.0 / (2.0 * sqrt(3.0))
+	const w := sqrt(3.0) / 8.0
+	const t := 1.0 / 2.0
+	const s := 1.0 / 8.0
+	match peering:
+		-1:
+			return PackedVector2Array([
+				Vector2(t - s, t - w),
+				Vector2(t + s, t - w),
+				Vector2(6 * s, t),
+				Vector2(t + s, t + w),
+				Vector2(t - s, t + w),
+				Vector2(2 * s, t)
+			])
+		TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_CORNER:
+			return PackedVector2Array([
+				Vector2(6 * s, t),
+				Vector2(1, t),
+				Vector2(1, t + e),
+				Vector2(t + e, 1 - s),
+				Vector2(t + s, t +  w)
+			])
+		TileSet.CELL_NEIGHBOR_BOTTOM_CORNER:
+			return PackedVector2Array([
+				Vector2(t - s, t + w),
+				Vector2(t + s, t + w),
+				Vector2(t + e, 1 - s),
+				Vector2(t, 1),
+				Vector2(t - e, 1 - s)
+			])
+		TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_CORNER:
+			return PackedVector2Array([
+				Vector2(0, t),
+				Vector2(2 * s, t),
+				Vector2(t - s, t +  w),
+				Vector2(t - e, 1 - s),
+				Vector2(0, t + e)
+			])
+		TileSet.CELL_NEIGHBOR_TOP_LEFT_CORNER:
+			return PackedVector2Array([
+				Vector2(t - e, s),
+				Vector2(t - s, t - w),
+				Vector2(2 * s, t),
+				Vector2(0, t),
+				Vector2(0, t - e)
+			])
+		TileSet.CELL_NEIGHBOR_TOP_CORNER:
+			return PackedVector2Array([
+				Vector2(t, 0),
+				Vector2(t + e, s),
+				Vector2(t + s, t - w),
+				Vector2(t - s, t - w),
+				Vector2(t - e, s)
+			])
+		TileSet.CELL_NEIGHBOR_TOP_RIGHT_CORNER:
+			return PackedVector2Array([
+				Vector2(t + e, s),
+				Vector2(1, t - e),
+				Vector2(1, t),
+				Vector2(6 * s, t),
+				Vector2(t + s, t - w)
+			])
+	return PackedVector2Array()
+
+
+static func _peering_polygon_vertical_tiles(peering: int) -> PackedVector2Array:
+	const e := 1.0 / (2.0 * sqrt(3.0))
+	const w := sqrt(3.0) / 8.0
+	const t := 1.0 / 2.0
+	const s := 1.0 / 8.0
+	match peering:
+		-1:
+			return PackedVector2Array([
+				Vector2(t - s, t - w),
+				Vector2(t + s, t - w),
+				Vector2(6 * s, t),
+				Vector2(t + s, t + w),
+				Vector2(t - s, t + w),
+				Vector2(2 * s, t)
+			])
+		TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_SIDE:
+			return PackedVector2Array([
+				Vector2(6 * s, t),
+				Vector2(1, t),
+				Vector2(t + e, 1),
+				Vector2(t + s, t + w)
+			])
+		TileSet.CELL_NEIGHBOR_BOTTOM_SIDE:
+			return PackedVector2Array([
+				Vector2(t - s, t + w),
+				Vector2(t + s, t + w),
+				Vector2(t + e, 1),
+				Vector2(t - e, 1)
+			])
+		TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_SIDE:
+			return PackedVector2Array([
+				Vector2(0, t),
+				Vector2(2 * s, t),
+				Vector2(t - s, t + w),
+				Vector2(t - e, 1)
+			])
+		TileSet.CELL_NEIGHBOR_TOP_LEFT_SIDE:
+			return PackedVector2Array([
+				Vector2(t - e, 0),
+				Vector2(t - s, t - w),
+				Vector2(2 * s, t),
+				Vector2(0, t)
+			])
+		TileSet.CELL_NEIGHBOR_TOP_SIDE:
+			return PackedVector2Array([
+				Vector2(t - e, 0),
+				Vector2(t + e, 0),
+				Vector2(t + s, t - w),
+				Vector2(t - s, t - w)
+			])
+		TileSet.CELL_NEIGHBOR_TOP_RIGHT_SIDE:
+			return PackedVector2Array([
+				Vector2(t + e, 0),
+				Vector2(1, t),
+				Vector2(6 * s, t),
+				Vector2(t + s, t - w)
+			])
+	return PackedVector2Array()
+
+
+static func _peering_polygon_vertical_vertices(peering: int) -> PackedVector2Array:
+	const e := 1.0 / (2.0 * sqrt(3.0))
+	const w := sqrt(3.0) / 8.0
+	const t := 1.0 / 2.0
+	const s := 1.0 / 8.0
+	match peering:
+		-1:
+			return PackedVector2Array([
+				Vector2(t, 2 * s),
+				Vector2(t + w, t - s),
+				Vector2(t + w, t + s),
+				Vector2(t, 6 * s),
+				Vector2(t - w, t + s),
+				Vector2(t - w, t - s)
+			])
+		TileSet.CELL_NEIGHBOR_RIGHT_CORNER:
+			return PackedVector2Array([
+				Vector2(1 - s, t - e),
+				Vector2(1, t),
+				Vector2(1 - s, t + e),
+				Vector2(t + w, t + s),
+				Vector2(t + w, t - s)
+			])
+		TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_CORNER:			
+			return PackedVector2Array([
+				Vector2(t + w, t + s),
+				Vector2(1 - s, t + e),
+				Vector2(t + e, 1),
+				Vector2(t, 1),
+				Vector2(t, 6 * s)
+			])
+		TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_CORNER:
+			return PackedVector2Array([
+				Vector2(t - w, t + s),
+				Vector2(t, 6 * s),
+				Vector2(t, 1),
+				Vector2(t - e, 1),
+				Vector2(s, t + e)
+			])
+		TileSet.CELL_NEIGHBOR_LEFT_CORNER:
+			return PackedVector2Array([
+				Vector2(s, t - e),
+				Vector2(t - w, t - s),
+				Vector2(t - w, t + s),
+				Vector2(s, t + e),
+				Vector2(0, t)
+			])
+		TileSet.CELL_NEIGHBOR_TOP_LEFT_CORNER:
+			return PackedVector2Array([
+				Vector2(t - e, 0),
+				Vector2(t, 0),
+				Vector2(t, 2 * s),
+				Vector2(t - w, t - s),
+				Vector2(s, t - e)
+			])
+		TileSet.CELL_NEIGHBOR_TOP_RIGHT_CORNER:
+			return PackedVector2Array([
+				Vector2(t, 0),
+				Vector2(t + e, 0),
+				Vector2(1 - s, t - e),
+				Vector2(t + w, t - s),
+				Vector2(t, 2 * s)
+			])
+	return PackedVector2Array()
+
+
+static func _peering_non_modifying() -> PackedVector2Array:
+	const t := 1.0 / 3.0
+	return PackedVector2Array([
+		Vector2(t, 0),
+		Vector2(2 * t, 0),
+		Vector2(1, t),
+		Vector2(1, 2 * t),
+		Vector2(2 * t, 1),
+		Vector2(t, 1),
+		Vector2(0, 2 * t),
+		Vector2(0, t)
+	])
+
+
+## Returns a parameterized polygon (coordinated are between 0 and 1) for [code]peering[/code]
+## direction for a terrain of [code]type[/code] in [TileSet]
+static func peering_polygon(ts: TileSet, type: int, peering: int) -> PackedVector2Array:
+	if type == BetterTerrain.TerrainType.CATEGORY:
+		return _peering_non_modifying()
+	if type == BetterTerrain.TerrainType.DECORATION:
+		type = BetterTerrain.TerrainType.MATCH_TILES
+	
+	match [ts.tile_shape, type]:
+		[TileSet.TILE_SHAPE_SQUARE, BetterTerrain.TerrainType.MATCH_TILES]:
+			return _peering_polygon_square_tiles(peering)
+		[TileSet.TILE_SHAPE_SQUARE, BetterTerrain.TerrainType.MATCH_VERTICES]:
+			return _peering_polygon_square_vertices(peering)
+		[TileSet.TILE_SHAPE_ISOMETRIC, BetterTerrain.TerrainType.MATCH_TILES]:
+			return _peering_polygon_isometric_tiles(peering)
+		[TileSet.TILE_SHAPE_ISOMETRIC, BetterTerrain.TerrainType.MATCH_VERTICES]:
+			return _peering_polygon_isometric_vertices(peering)
+	
+	match [ts.tile_offset_axis, type]:
+		[TileSet.TILE_OFFSET_AXIS_VERTICAL, BetterTerrain.TerrainType.MATCH_TILES]:
+			return _peering_polygon_vertical_tiles(peering)
+		[TileSet.TILE_OFFSET_AXIS_VERTICAL, BetterTerrain.TerrainType.MATCH_VERTICES]:
+			return _peering_polygon_vertical_vertices(peering)
+		[TileSet.TILE_OFFSET_AXIS_HORIZONTAL, BetterTerrain.TerrainType.MATCH_TILES]:
+			return _peering_polygon_horizontal_tiles(peering)
+		[TileSet.TILE_OFFSET_AXIS_HORIZONTAL, BetterTerrain.TerrainType.MATCH_VERTICES]:
+			return _peering_polygon_horizontal_vertices(peering)
+	
+	return PackedVector2Array()
+
+
+## Returns as polygon centered on 0, 0 which represents the shape of the cell of
+## a tile from [TileSet].
+static func cell_polygon(ts: TileSet) -> PackedVector2Array:
+	const t := 1.0 / 2.0
+	if ts.tile_shape in [TileSet.TILE_SHAPE_SQUARE, TileSet.TILE_SHAPE_HALF_OFFSET_SQUARE]:
+		return PackedVector2Array([Vector2(-t, -t), Vector2(t, -t), Vector2(t, t), Vector2(-t, t)])
+	if ts.tile_shape == TileSet.TILE_SHAPE_ISOMETRIC:
+		return PackedVector2Array([Vector2(0, -t), Vector2(t, 0), Vector2(0, t), Vector2(-t, 0)])
+	
+	const e := t - 1.0 / (2.0 * sqrt(3.0))
+	if ts.tile_offset_axis == TileSet.TILE_OFFSET_AXIS_HORIZONTAL:
+		return PackedVector2Array([
+			Vector2(0, -t),
+			Vector2(t, -e),
+			Vector2(t, e),
+			Vector2(0, t),
+			Vector2(-t, e),
+			Vector2(-t, -e),
+		])
+	
+	return PackedVector2Array([
+		Vector2(-t, 0),
+		Vector2(-e, -t),
+		Vector2(e, -t),
+		Vector2(t, 0),
+		Vector2(e, t),
+		Vector2(-e, t),
+	])
+
+
+## Returns an [Array] of coordinated that neighbor [code]coord[/code] based on [code]peering[/code]
+## [Array] of [enum TileSet.CellNeighbor] for a [TileSet].
+static func neighboring_coords(tm: TileMapLayer, coord: Vector2i, peerings: Array) -> Array:
+	return peerings.map(func(p): return tm.get_neighbor_cell(coord, p))
+
+
+## Returns an [Array] of coordinates which neighbor the vertex describe by [code]corner[/code]
+## (which is of type [enum TileSet.CellNeighbor]) from [code]coord[/code] in [TileSet].
+static func associated_vertex_cells(tm: TileMapLayer, coord: Vector2i, corner: int) -> Array:
+	# get array of associated peering bits
+	if tm.tile_set.tile_shape in [TileSet.TILE_SHAPE_SQUARE, TileSet.TILE_SHAPE_ISOMETRIC]:
+		match corner:
+			# Square
+			TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_CORNER:
+				return neighboring_coords(tm, coord, [0, 3, 4])
+			TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_CORNER:
+				return neighboring_coords(tm, coord, [4, 7, 8])
+			TileSet.CELL_NEIGHBOR_TOP_LEFT_CORNER:
+				return neighboring_coords(tm, coord, [8, 11, 12])
+			TileSet.CELL_NEIGHBOR_TOP_RIGHT_CORNER:
+				return neighboring_coords(tm, coord, [12, 15, 0])
+			# Isometric
+			TileSet.CELL_NEIGHBOR_RIGHT_CORNER:
+				return neighboring_coords(tm, coord, [14, 1, 2])
+			TileSet.CELL_NEIGHBOR_BOTTOM_CORNER:
+				return neighboring_coords(tm, coord, [2, 5, 6])
+			TileSet.CELL_NEIGHBOR_LEFT_CORNER:
+				return neighboring_coords(tm, coord, [6, 9, 10])
+			TileSet.CELL_NEIGHBOR_TOP_CORNER:
+				return neighboring_coords(tm, coord, [10, 13, 14])
+	
+	if tm.tile_set.tile_offset_axis == TileSet.TILE_OFFSET_AXIS_HORIZONTAL:
+		match corner:
+			TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_CORNER:
+				return neighboring_coords(tm, coord, [0, 2])
+			TileSet.CELL_NEIGHBOR_BOTTOM_CORNER:
+				return neighboring_coords(tm, coord, [2, 6])
+			TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_CORNER:
+				return neighboring_coords(tm, coord, [6, 8])
+			TileSet.CELL_NEIGHBOR_TOP_LEFT_CORNER:
+				return neighboring_coords(tm, coord, [8, 10])
+			TileSet.CELL_NEIGHBOR_TOP_CORNER:
+				return neighboring_coords(tm, coord, [10, 14])
+			TileSet.CELL_NEIGHBOR_TOP_RIGHT_CORNER:
+				return neighboring_coords(tm, coord, [14, 0])
+	
+	# TileSet.TILE_OFFSET_AXIS_VERTICAL
+	match corner:
+		TileSet.CELL_NEIGHBOR_RIGHT_CORNER:
+			return neighboring_coords(tm, coord, [14, 2])
+		TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_CORNER:
+			return neighboring_coords(tm, coord, [2, 4])
+		TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_CORNER:
+			return neighboring_coords(tm, coord, [4, 6])
+		TileSet.CELL_NEIGHBOR_LEFT_CORNER:
+			return neighboring_coords(tm, coord, [6, 10])
+		TileSet.CELL_NEIGHBOR_TOP_LEFT_CORNER:
+			return neighboring_coords(tm, coord, [10, 12])
+		TileSet.CELL_NEIGHBOR_TOP_RIGHT_CORNER:
+			return neighboring_coords(tm, coord, [12, 14])
+	
+	return []
+
+
+## Returns an [Array] of [enum TileSet.CellNeighbor] suitable for flood filling
+## an area in [TileSet].
+static func cells_adjacent_for_fill(ts: TileSet) -> Array[int]:
+	if ts.tile_shape == TileSet.TILE_SHAPE_SQUARE:
+		return [0, 4, 8, 12]
+	if ts.tile_shape == TileSet.TILE_SHAPE_ISOMETRIC:
+		return [2, 6, 10, 14]
+	if ts.tile_offset_axis == TileSet.TILE_OFFSET_AXIS_HORIZONTAL:
+		return _terrain_peering_horiztonal_tiles
+	return _terrain_peering_vertical_tiles
+
+
+static func peering_bit_after_symmetry(bit: int, altflags: int) -> int:
+	if altflags & TileSetAtlasSource.TRANSFORM_TRANSPOSE:
+		bit = _terrain_peering_transpose[bit]
+	if altflags & TileSetAtlasSource.TRANSFORM_FLIP_H:
+		bit = _terrain_peering_hflip[bit]
+	if altflags & TileSetAtlasSource.TRANSFORM_FLIP_V:
+		bit = _terrain_peering_vflip[bit]
+	return bit
+
+
+static func peering_bits_after_symmetry(dict: Dictionary, altflags: int) -> Dictionary:
+	# rearrange dictionary keys based on altflags
+	var result := {}
+	for k in dict:
+		result[peering_bit_after_symmetry(k, altflags)] = dict[k]
+	return result

addons/better-terrain/BetterTerrainData.gd.uid

@@ -0,0 +1 @@
+uid://dns30obk1hpvd

addons/better-terrain/TerrainPlugin.gd

@@ -0,0 +1,72 @@
+@tool
+extends EditorPlugin
+
+const AUTOLOAD_NAME = "BetterTerrain"
+var dock : Control
+var button : Button
+
+func _enter_tree() -> void:
+	# Wait for autoloads to register
+	await get_tree().process_frame
+	
+	if !get_tree().root.get_node_or_null(^"BetterTerrain"):
+		# Autoload wasn't present on plugin init, which means plugin won't have loaded correctly
+		add_autoload_singleton(AUTOLOAD_NAME, "res://addons/better-terrain/BetterTerrain.gd")
+		ProjectSettings.save()
+		
+		var confirm = ConfirmationDialog.new()
+		confirm.dialog_text = "The editor needs to be restarted for Better Terrain to load correctly. Restart now? Note: Unsaved changes will be lost."
+		confirm.confirmed.connect(func():
+			OS.set_restart_on_exit(true, ["-e"])
+			get_tree().quit()
+		)
+		get_editor_interface().popup_dialog_centered(confirm)
+	
+	dock = load("res://addons/better-terrain/editor/Dock.tscn").instantiate()
+	dock.update_overlay.connect(self.update_overlays)
+	get_editor_interface().get_editor_main_screen().mouse_exited.connect(dock.canvas_mouse_exit)
+	dock.undo_manager = get_undo_redo()
+	button = add_control_to_bottom_panel(dock, "Terrain")
+	button.toggled.connect(dock.about_to_be_visible)
+	dock.force_show_terrains.connect(button.toggled.emit.bind(true))
+	button.visible = false
+
+
+func _exit_tree() -> void:
+	remove_control_from_bottom_panel(dock)
+	dock.queue_free()
+
+
+func _handles(object) -> bool:
+	return object is TileMapLayer or object is TileSet
+
+
+func _make_visible(visible) -> void:
+	button.visible = visible
+
+
+func _edit(object) -> void:
+	var new_tileset : TileSet = null
+	
+	if object is TileMapLayer:
+		dock.tilemap = object
+		new_tileset = object.tile_set
+	if object is TileSet:
+		new_tileset = object
+	
+	if dock.tileset != new_tileset:
+		dock.tiles_about_to_change()
+		dock.tileset = new_tileset
+		dock.tiles_changed()
+
+
+func _forward_canvas_draw_over_viewport(overlay: Control) -> void:
+	if dock.visible:
+		dock.canvas_draw(overlay)
+
+
+func _forward_canvas_gui_input(event: InputEvent) -> bool:
+	if !dock.visible:
+		return false
+	
+	return dock.canvas_input(event)

addons/better-terrain/TerrainPlugin.gd.uid

@@ -0,0 +1 @@
+uid://bj2cm2q4tdgno

addons/better-terrain/Watcher.gd

@@ -0,0 +1,20 @@
+@tool
+extends Node
+
+signal trigger
+var complete := false
+var tileset : TileSet
+
+func tidy() -> bool:
+	if complete:
+		return false
+	
+	complete = true
+	queue_free()
+	return true
+
+
+func activate():
+	if tidy():
+		trigger.emit()
+

addons/better-terrain/Watcher.gd.uid

@@ -0,0 +1 @@
+uid://d3rqd2eagpoe0

addons/better-terrain/editor/Dock.gd

@@ -0,0 +1,939 @@
+@tool
+extends Control
+
+signal update_overlay
+signal force_show_terrains
+
+# The maximum individual tiles the overlay will draw before shortcutting the display
+# To prevent editor lag when drawing large rectangles or filling large areas
+const MAX_CANVAS_RENDER_TILES = 1500
+const TERRAIN_PROPERTIES_SCENE := preload("res://addons/better-terrain/editor/TerrainProperties.tscn")
+const TERRAIN_ENTRY_SCENE := preload("res://addons/better-terrain/editor/TerrainEntry.tscn")
+const MIN_ZOOM_SETTING := "editor/better_terrain/min_zoom_amount"
+const MAX_ZOOM_SETTING := "editor/better_terrain/max_zoom_amount"
+
+
+# Buttons
+@onready var draw_button: Button = $VBox/Toolbar/Draw
+@onready var line_button: Button = $VBox/Toolbar/Line
+@onready var rectangle_button: Button = $VBox/Toolbar/Rectangle
+@onready var fill_button: Button = $VBox/Toolbar/Fill
+@onready var replace_button: Button = $VBox/Toolbar/Replace
+
+@onready var paint_type: Button = $VBox/Toolbar/PaintType
+@onready var paint_terrain: Button = $VBox/Toolbar/PaintTerrain
+@onready var select_tiles: Button = $VBox/Toolbar/SelectTiles
+
+@onready var paint_symmetry: Button = $VBox/Toolbar/PaintSymmetry
+@onready var symmetry_options: OptionButton = $VBox/Toolbar/SymmetryOptions
+
+@onready var shuffle_random: Button = $VBox/Toolbar/ShuffleRandom
+@onready var zoom_slider_container: VBoxContainer = $VBox/Toolbar/ZoomContainer
+
+@onready var source_selector: MenuBar = $VBox/Toolbar/Sources
+@onready var source_selector_popup: PopupMenu = $VBox/Toolbar/Sources/Sources
+
+@onready var clean_button: Button = $VBox/Toolbar/Clean
+@onready var layer_up: Button = $VBox/Toolbar/LayerUp
+@onready var layer_down: Button = $VBox/Toolbar/LayerDown
+@onready var layer_highlight: Button = $VBox/Toolbar/LayerHighlight
+@onready var layer_grid: Button = $VBox/Toolbar/LayerGrid
+
+@onready var grid_mode_button: Button = $VBox/HSplit/Terrains/LowerToolbar/GridMode
+@onready var quick_mode_button: Button = $VBox/HSplit/Terrains/LowerToolbar/QuickMode
+
+@onready var edit_tool_buttons: HBoxContainer = $VBox/HSplit/Terrains/LowerToolbar/EditTools
+@onready var add_terrain_button: Button = $VBox/HSplit/Terrains/LowerToolbar/EditTools/AddTerrain
+@onready var edit_terrain_button: Button = $VBox/HSplit/Terrains/LowerToolbar/EditTools/EditTerrain
+@onready var pick_icon_button: Button = $VBox/HSplit/Terrains/LowerToolbar/EditTools/PickIcon
+@onready var move_up_button: Button = $VBox/HSplit/Terrains/LowerToolbar/EditTools/MoveUp
+@onready var move_down_button: Button = $VBox/HSplit/Terrains/LowerToolbar/EditTools/MoveDown
+@onready var remove_terrain_button: Button = $VBox/HSplit/Terrains/LowerToolbar/EditTools/RemoveTerrain
+
+@onready var scroll_container: ScrollContainer = $VBox/HSplit/Terrains/Panel/ScrollContainer
+@onready var terrain_list: HFlowContainer = $VBox/HSplit/Terrains/Panel/ScrollContainer/TerrainList
+@onready var tile_view: Control = $VBox/HSplit/Panel/ScrollArea/TileView
+
+
+var selected_entry := -2
+
+var tilemap : TileMapLayer
+var tileset : TileSet
+
+var undo_manager : EditorUndoRedoManager
+var terrain_undo
+
+var draw_overlay := false
+var initial_click : Vector2i
+var prev_position : Vector2i
+var current_position : Vector2i
+var tileset_dirty := false
+var zoom_slider : HSlider
+
+enum PaintMode {
+	NO_PAINT,
+	PAINT,
+	ERASE
+}
+
+enum PaintAction {
+	NO_ACTION,
+	LINE,
+	RECT
+}
+
+enum SourceSelectors {
+	ALL = 1000000,
+	NONE = 1000001,
+}
+
+var paint_mode := PaintMode.NO_PAINT
+
+var paint_action := PaintAction.NO_ACTION
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	draw_button.icon = get_theme_icon("Edit", "EditorIcons")
+	line_button.icon = get_theme_icon("Line", "EditorIcons")
+	rectangle_button.icon = get_theme_icon("Rectangle", "EditorIcons")
+	fill_button.icon = get_theme_icon("Bucket", "EditorIcons")
+	select_tiles.icon = get_theme_icon("ToolSelect", "EditorIcons")
+	add_terrain_button.icon = get_theme_icon("Add", "EditorIcons")
+	edit_terrain_button.icon = get_theme_icon("Tools", "EditorIcons")
+	pick_icon_button.icon = get_theme_icon("ColorPick", "EditorIcons")
+	move_up_button.icon = get_theme_icon("ArrowUp", "EditorIcons")
+	move_down_button.icon = get_theme_icon("ArrowDown", "EditorIcons")
+	remove_terrain_button.icon = get_theme_icon("Remove", "EditorIcons")
+	grid_mode_button.icon = get_theme_icon("FileThumbnail", "EditorIcons")
+	quick_mode_button.icon = get_theme_icon("GuiVisibilityVisible", "EditorIcons")
+	layer_up.icon = get_theme_icon("MoveUp", "EditorIcons")
+	layer_down.icon = get_theme_icon("MoveDown", "EditorIcons")
+	layer_highlight.icon = get_theme_icon("TileMapHighlightSelected", "EditorIcons")
+	layer_grid.icon = get_theme_icon("Grid", "EditorIcons")
+	
+	select_tiles.button_group.pressed.connect(_on_bit_button_pressed)
+	
+	terrain_undo = load("res://addons/better-terrain/editor/TerrainUndo.gd").new()
+	add_child(terrain_undo)
+	tile_view.undo_manager = undo_manager
+	tile_view.terrain_undo = terrain_undo
+	
+	tile_view.paste_occurred.connect(_on_paste_occurred)
+	tile_view.change_zoom_level.connect(_on_change_zoom_level)
+	tile_view.terrain_updated.connect(_on_terrain_updated)
+	
+	# Zoom slider is manipulated by settings, make it at runtime
+	zoom_slider = HSlider.new()
+	zoom_slider.custom_minimum_size = Vector2(100, 0)
+	zoom_slider.value_changed.connect(tile_view._on_zoom_value_changed)
+	zoom_slider_container.add_child(zoom_slider)
+	
+	# Init settings if needed
+	if !ProjectSettings.has_setting(MIN_ZOOM_SETTING):
+		ProjectSettings.set(MIN_ZOOM_SETTING, 1.0)
+	ProjectSettings.add_property_info({
+		"name": MIN_ZOOM_SETTING,
+		"type": TYPE_FLOAT,
+		"hint": PROPERTY_HINT_RANGE,
+		"hint_string": "0.1,1.0,0.1"
+	})
+	ProjectSettings.set_initial_value(MIN_ZOOM_SETTING, 1.0)
+	ProjectSettings.set_as_basic(MIN_ZOOM_SETTING, true)
+	
+	if !ProjectSettings.has_setting(MAX_ZOOM_SETTING):
+		ProjectSettings.set(MAX_ZOOM_SETTING, 8.0)
+	ProjectSettings.add_property_info({
+		"name": MAX_ZOOM_SETTING,
+		"type": TYPE_FLOAT,
+		"hint": PROPERTY_HINT_RANGE,
+		"hint_string": "2.0,32.0,1.0"
+	})
+	ProjectSettings.set_initial_value(MAX_ZOOM_SETTING, 8.0)
+	ProjectSettings.set_as_basic(MAX_ZOOM_SETTING, true)
+	ProjectSettings.set_order(MAX_ZOOM_SETTING, ProjectSettings.get_order(MIN_ZOOM_SETTING) + 1)
+	
+	ProjectSettings.settings_changed.connect(_on_adjust_settings)
+	_on_adjust_settings()
+	zoom_slider.value = 1.0
+
+
+func _process(delta):
+	scroll_container.scroll_horizontal = 0
+
+
+func _on_adjust_settings():
+	zoom_slider.min_value = ProjectSettings.get_setting(MIN_ZOOM_SETTING, 1.0)
+	zoom_slider.max_value = ProjectSettings.get_setting(MAX_ZOOM_SETTING, 8.0)
+	zoom_slider.step = (zoom_slider.max_value - zoom_slider.min_value) / 100.0
+
+
+func _get_fill_cells(target: Vector2i) -> Array:
+	var pick := BetterTerrain.get_cell(tilemap, target)
+	var bounds := tilemap.get_used_rect()
+	var neighbors = BetterTerrain.data.cells_adjacent_for_fill(tileset)
+	
+	# No sets yet, so use a dictionary
+	var checked := {}
+	var pending := [target]
+	var goal := []
+	
+	while !pending.is_empty():
+		var p = pending.pop_front()
+		if checked.has(p):
+			continue
+		checked[p] = true
+		if !bounds.has_point(p) or BetterTerrain.get_cell(tilemap, p) != pick:
+			continue
+		
+		goal.append(p)
+		pending.append_array(BetterTerrain.data.neighboring_coords(tilemap, p, neighbors))
+	
+	return goal
+
+
+func tiles_about_to_change() -> void:
+	if tileset and tileset.changed.is_connected(queue_tiles_changed):
+		tileset.changed.disconnect(queue_tiles_changed)
+
+
+func tiles_changed() -> void:
+	# ensure up to date
+	BetterTerrain._update_terrain_data(tileset)
+	
+	# clear terrains
+	for c in terrain_list.get_children():
+		terrain_list.remove_child(c)
+		c.queue_free()
+	
+	# load terrains from tileset
+	var terrain_count := BetterTerrain.terrain_count(tileset)
+	var item_count = terrain_count + 1
+	for i in terrain_count:
+		var terrain := BetterTerrain.get_terrain(tileset, i)
+		if i >= terrain_list.get_child_count():
+			add_terrain_entry(terrain, i)
+	
+	if item_count > terrain_list.get_child_count():
+		var terrain := BetterTerrain.get_terrain(tileset, BetterTerrain.TileCategory.EMPTY)
+		if terrain.valid:
+			add_terrain_entry(terrain, item_count - 1)
+	
+	while item_count < terrain_list.get_child_count():
+		var child = terrain_list.get_child(terrain_list.get_child_count() - 1)
+		terrain_list.remove_child(child)
+		child.free()
+	
+	source_selector_popup.clear()
+	source_selector_popup.add_item("All", SourceSelectors.ALL)
+	source_selector_popup.add_item("None", SourceSelectors.NONE)
+	var source_count = tileset.get_source_count() if tileset else 0
+	for s in source_count:
+		var source_id = tileset.get_source_id(s)
+		var source := tileset.get_source(source_id)
+		if !(source is TileSetAtlasSource):
+			continue
+		
+		var name := source.resource_name
+		if name.is_empty():
+			var texture := (source as TileSetAtlasSource).texture
+			var texture_name := texture.resource_name if texture else ""
+			if !texture_name.is_empty():
+				name = texture_name
+			else:
+				var texture_path := texture.resource_path if texture else ""
+				if !texture_path.is_empty():
+					name = texture_path.get_file()
+		
+		if !name.is_empty():
+			name += " "
+		name += " (ID: %d)" % source_id
+		
+		source_selector_popup.add_check_item(name, source_id)
+		source_selector_popup.set_item_checked(source_selector_popup.get_item_index(source_id), true)
+	source_selector.visible = source_selector_popup.item_count > 3 # All, None and more than one source
+	
+	update_tile_view_paint()
+	tile_view.refresh_tileset(tileset)
+	
+	if tileset and !tileset.changed.is_connected(queue_tiles_changed):
+		tileset.changed.connect(queue_tiles_changed)
+	
+	clean_button.visible = BetterTerrain._has_invalid_peering_types(tileset)
+	
+	tileset_dirty = false
+	_on_grid_mode_pressed()
+	_on_quick_mode_pressed()
+
+
+func about_to_be_visible(visible: bool) -> void:
+	if !visible:
+		return
+	
+	if tileset != tilemap.tile_set:
+		tiles_about_to_change()
+		tileset = tilemap.tile_set
+		tiles_changed()
+	
+	var settings := EditorInterface.get_editor_settings()
+	layer_highlight.set_pressed_no_signal(settings.get_setting("editors/tiles_editor/highlight_selected_layer"))
+	layer_grid.set_pressed_no_signal(settings.get_setting("editors/tiles_editor/display_grid"))
+
+
+func queue_tiles_changed() -> void:
+	# Bring terrain data up to date with complex tileset changes
+	if !tileset or tileset_dirty:
+		return
+	
+	tileset_dirty = true
+	tiles_changed.call_deferred()
+
+
+func _on_entry_select(index:int):
+	selected_entry = index
+	if selected_entry >= BetterTerrain.terrain_count(tileset):
+		selected_entry = BetterTerrain.TileCategory.EMPTY
+	for i in range(terrain_list.get_child_count()):
+		if i != index:
+			terrain_list.get_child(i).set_selected(false)
+	update_tile_view_paint()
+
+
+func _on_clean_pressed() -> void:
+	var confirmed := [false]
+	var popup := ConfirmationDialog.new()
+	popup.dialog_text = tr("Tile set changes have caused terrain to become invalid. Remove invalid terrain data?")
+	popup.dialog_hide_on_ok = false
+	popup.confirmed.connect(func():
+		confirmed[0] = true
+		popup.hide()
+	)
+	EditorInterface.popup_dialog_centered(popup)
+	await popup.visibility_changed
+	popup.queue_free()
+	
+	if confirmed[0]:
+		undo_manager.create_action("Clean invalid terrain peering data", UndoRedo.MERGE_DISABLE, tileset)
+		undo_manager.add_do_method(BetterTerrain, &"_clear_invalid_peering_types", tileset)
+		undo_manager.add_do_method(self, &"tiles_changed")
+		terrain_undo.create_peering_restore_point(undo_manager, tileset)
+		undo_manager.add_undo_method(self, &"tiles_changed")
+		undo_manager.commit_action()
+
+
+func _on_grid_mode_pressed() -> void:
+	for c in terrain_list.get_children():
+		c.grid_mode = grid_mode_button.button_pressed
+		c.update_style()
+
+
+func _on_quick_mode_pressed() -> void:
+	edit_tool_buttons.visible = !quick_mode_button.button_pressed
+	for c in terrain_list.get_children():
+		c.visible = !quick_mode_button.button_pressed or c.terrain.type in [BetterTerrain.TerrainType.MATCH_TILES, BetterTerrain.TerrainType.MATCH_VERTICES]
+
+
+func update_tile_view_paint() -> void:
+	tile_view.paint = selected_entry
+	tile_view.queue_redraw()
+	
+	var editable = tile_view.paint != BetterTerrain.TileCategory.EMPTY
+	edit_terrain_button.disabled = !editable
+	move_up_button.disabled = !editable or tile_view.paint == 0
+	move_down_button.disabled = !editable or tile_view.paint == BetterTerrain.terrain_count(tileset) - 1
+	remove_terrain_button.disabled = !editable
+	pick_icon_button.disabled = !editable
+
+
+func _on_add_terrain_pressed() -> void:
+	if !tileset:
+		return
+	
+	var popup := TERRAIN_PROPERTIES_SCENE.instantiate()
+	popup.set_category_data(BetterTerrain.get_terrain_categories(tileset))
+	popup.terrain_name = "New terrain"
+	popup.terrain_color = Color.from_hsv(randf(), 0.3 + 0.7 * randf(), 0.6 + 0.4 * randf())
+	popup.terrain_icon = ""
+	popup.terrain_type = 0
+	EditorInterface.popup_dialog_centered(popup)
+	await popup.visibility_changed
+	if popup.accepted:
+		undo_manager.create_action("Add terrain type", UndoRedo.MERGE_DISABLE, tileset)
+		undo_manager.add_do_method(self, &"perform_add_terrain", popup.terrain_name, popup.terrain_color, popup.terrain_type, popup.terrain_categories, {path = popup.terrain_icon})
+		undo_manager.add_undo_method(self, &"perform_remove_terrain", terrain_list.get_child_count() - 1)
+		undo_manager.commit_action()
+	popup.queue_free()
+
+
+func _on_edit_terrain_pressed() -> void:
+	if !tileset:
+		return
+	
+	if selected_entry < 0:
+		return
+	
+	var t := BetterTerrain.get_terrain(tileset, selected_entry)
+	var categories = BetterTerrain.get_terrain_categories(tileset)
+	categories = categories.filter(func(x): return x.id != selected_entry)
+	
+	var popup := TERRAIN_PROPERTIES_SCENE.instantiate()
+	popup.set_category_data(categories)
+	
+	t.icon = t.icon.duplicate()
+	
+	popup.terrain_name = t.name
+	popup.terrain_type = t.type
+	popup.terrain_color = t.color
+	if t.has("icon") and t.icon.has("path"):
+		popup.terrain_icon = t.icon.path
+	popup.terrain_categories = t.categories
+	EditorInterface.popup_dialog_centered(popup)
+	await popup.visibility_changed
+	if popup.accepted:
+		undo_manager.create_action("Edit terrain details", UndoRedo.MERGE_DISABLE, tileset)
+		undo_manager.add_do_method(self, &"perform_edit_terrain", selected_entry, popup.terrain_name, popup.terrain_color, popup.terrain_type, popup.terrain_categories, {path = popup.terrain_icon})
+		undo_manager.add_undo_method(self, &"perform_edit_terrain", selected_entry, t.name, t.color, t.type, t.categories, t.icon)
+		if t.type != popup.terrain_type:
+			terrain_undo.create_terrain_type_restore_point(undo_manager, tileset)
+			terrain_undo.create_peering_restore_point_specific(undo_manager, tileset, selected_entry)
+		undo_manager.commit_action()
+	popup.queue_free()
+
+
+func _on_pick_icon_pressed():
+	if selected_entry < 0:
+		return
+	tile_view.pick_icon_terrain = selected_entry
+
+
+func _on_pick_icon_focus_exited():
+	tile_view.pick_icon_terrain_cancel = true
+	pick_icon_button.button_pressed = false
+
+
+func _on_move_pressed(down: bool) -> void:
+	if !tileset:
+		return
+	
+	if selected_entry < 0:
+		return
+	
+	var index1 = selected_entry
+	var index2 = index1 + (1 if down else -1)
+	if index2 < 0 or index2 >= terrain_list.get_child_count():
+		return
+	
+	undo_manager.create_action("Reorder terrains", UndoRedo.MERGE_DISABLE, tileset)
+	undo_manager.add_do_method(self, &"perform_swap_terrain", index1, index2)
+	undo_manager.add_undo_method(self, &"perform_swap_terrain", index1, index2)
+	undo_manager.commit_action()
+
+
+func _on_remove_terrain_pressed() -> void:
+	if !tileset:
+		return
+	
+	if selected_entry < 0:
+		return
+	
+	# store confirmation in array to pass by ref
+	var t := BetterTerrain.get_terrain(tileset, selected_entry)
+	var confirmed := [false]
+	var popup := ConfirmationDialog.new()
+	popup.dialog_text = tr("Are you sure you want to remove {0}?").format([t.name])
+	popup.dialog_hide_on_ok = false
+	popup.confirmed.connect(func():
+		confirmed[0] = true
+		popup.hide()
+	)
+	EditorInterface.popup_dialog_centered(popup)
+	await popup.visibility_changed
+	popup.queue_free()
+	
+	if confirmed[0]:
+		undo_manager.create_action("Remove terrain type", UndoRedo.MERGE_DISABLE, tileset)
+		undo_manager.add_do_method(self, &"perform_remove_terrain", selected_entry)
+		undo_manager.add_undo_method(self, &"perform_add_terrain", t.name, t.color, t.type, t.categories, t.icon)
+		for n in range(terrain_list.get_child_count() - 2, selected_entry, -1):
+			undo_manager.add_undo_method(self, &"perform_swap_terrain", n, n - 1)
+		if t.type == BetterTerrain.TerrainType.CATEGORY:
+			terrain_undo.create_terrain_type_restore_point(undo_manager, tileset)
+		terrain_undo.create_peering_restore_point_specific(undo_manager, tileset, selected_entry)
+		undo_manager.commit_action()
+
+
+func add_terrain_entry(terrain:Dictionary, index:int = -1):
+	if index < 0:
+		index = terrain_list.get_child_count()
+	
+	var entry = TERRAIN_ENTRY_SCENE.instantiate()
+	entry.tileset = tileset
+	entry.terrain = terrain
+	entry.grid_mode = grid_mode_button.button_pressed
+	entry.select.connect(_on_entry_select)
+	
+	terrain_list.add_child(entry)
+	terrain_list.move_child(entry, index)
+
+
+func remove_terrain_entry(index: int):
+	terrain_list.get_child(index).free()
+	for i in range(index, terrain_list.get_child_count()):
+		var child = terrain_list.get_child(i)
+		child.terrain = BetterTerrain.get_terrain(tileset, i)
+		child.update()
+
+
+func perform_add_terrain(name: String, color: Color, type: int, categories: Array, icon:Dictionary = {}) -> void:
+	if BetterTerrain.add_terrain(tileset, name, color, type, categories, icon):
+		var index = BetterTerrain.terrain_count(tileset) - 1
+		var terrain = BetterTerrain.get_terrain(tileset, index)
+		add_terrain_entry(terrain, index)
+
+
+func perform_remove_terrain(index: int) -> void:
+	if index >= BetterTerrain.terrain_count(tileset):
+		return
+	if BetterTerrain.remove_terrain(tileset, index):
+		remove_terrain_entry(index)
+		update_tile_view_paint()
+
+
+func perform_swap_terrain(index1: int, index2: int) -> void:
+	var lower := min(index1, index2)
+	var higher := max(index1, index2)
+	if lower >= terrain_list.get_child_count() or higher >= terrain_list.get_child_count():
+		return
+	var item1 = terrain_list.get_child(lower)
+	var item2 = terrain_list.get_child(higher)
+	if BetterTerrain.swap_terrains(tileset, lower, higher):
+		terrain_list.move_child(item1, higher)
+		item1.terrain = BetterTerrain.get_terrain(tileset, higher)
+		item1.update()
+		item2.terrain = BetterTerrain.get_terrain(tileset, lower)
+		item2.update()
+		selected_entry = index2
+		terrain_list.get_child(index2).set_selected(true)
+		update_tile_view_paint()
+
+
+func perform_edit_terrain(index: int, name: String, color: Color, type: int, categories: Array, icon: Dictionary = {}) -> void:
+	if index >= terrain_list.get_child_count():
+		return
+	var entry = terrain_list.get_child(index)
+	# don't overwrite empty icon
+	var valid_icon = icon
+	if icon.has("path") and icon.path.is_empty():
+		var terrain = BetterTerrain.get_terrain(tileset, index)
+		valid_icon = terrain.icon
+	if BetterTerrain.set_terrain(tileset, index, name, color, type, categories, valid_icon):
+		entry.terrain = BetterTerrain.get_terrain(tileset, index)
+		entry.update()
+		tile_view.queue_redraw()
+
+
+func _on_shuffle_random_pressed():
+	BetterTerrain.use_seed = !shuffle_random.button_pressed 
+
+
+func _on_bit_button_pressed(button: BaseButton) -> void:
+	match select_tiles.button_group.get_pressed_button():
+		select_tiles: tile_view.paint_mode = tile_view.PaintMode.SELECT
+		paint_type: tile_view.paint_mode = tile_view.PaintMode.PAINT_TYPE
+		paint_terrain: tile_view.paint_mode = tile_view.PaintMode.PAINT_PEERING
+		paint_symmetry: tile_view.paint_mode = tile_view.PaintMode.PAINT_SYMMETRY
+		_: tile_view.paint_mode = tile_view.PaintMode.NO_PAINT
+	tile_view.queue_redraw()
+	
+	symmetry_options.visible = paint_symmetry.button_pressed
+
+
+func _on_symmetry_selected(index):
+	tile_view.paint_symmetry = index
+
+
+func _on_paste_occurred():
+	select_tiles.button_pressed = true
+
+
+func _on_change_zoom_level(value):
+	zoom_slider.value = value
+
+
+func _on_terrain_updated(index):
+	var entry = terrain_list.get_child(index)
+	entry.terrain = BetterTerrain.get_terrain(tileset, index)
+	entry.update()
+
+
+func canvas_tilemap_transform() -> Transform2D:
+	var transform := tilemap.get_viewport_transform() * tilemap.global_transform
+	
+	# Handle subviewport
+	var editor_viewport := EditorInterface.get_editor_viewport_2d()
+	if tilemap.get_viewport() != editor_viewport:
+		var container = tilemap.get_viewport().get_parent() as SubViewportContainer
+		if container:
+			transform = editor_viewport.global_canvas_transform * container.get_transform() * transform
+	
+	return transform
+
+
+func canvas_draw(overlay: Control) -> void:
+	if !draw_overlay:
+		return
+	
+	if selected_entry < 0:
+		return
+	
+	var type = selected_entry
+	var terrain := BetterTerrain.get_terrain(tileset, type)
+	if !terrain.valid:
+		return
+	
+	var tiles := []
+	var transform := canvas_tilemap_transform()
+	
+	if paint_action == PaintAction.RECT and paint_mode != PaintMode.NO_PAINT:
+		var area := Rect2i(initial_click, current_position - initial_click).abs()
+
+		# Shortcut fill for large areas
+		if area.size.x > 1 and area.size.y > 1 and area.size.x * area.size.y > MAX_CANVAS_RENDER_TILES:
+			var shortcut := PackedVector2Array([
+				tilemap.map_to_local(area.position),
+				tilemap.map_to_local(Vector2i(area.end.x, area.position.y)),
+				tilemap.map_to_local(area.end),
+				tilemap.map_to_local(Vector2i(area.position.x, area.end.y))
+			])
+			overlay.draw_colored_polygon(transform * shortcut, Color(terrain.color, 0.5))
+			return
+		
+		for y in range(area.position.y, area.end.y + 1):
+			for x in range(area.position.x, area.end.x + 1):
+				tiles.append(Vector2i(x, y))
+	elif paint_action == PaintAction.LINE and paint_mode != PaintMode.NO_PAINT:
+		var cells := _get_tileset_line(initial_click, current_position, tileset)
+		var shape = BetterTerrain.data.cell_polygon(tileset)
+		for c in cells:
+			var tile_transform := Transform2D(0.0, tilemap.tile_set.tile_size, 0.0, tilemap.map_to_local(c))
+			overlay.draw_colored_polygon(transform * tile_transform * shape, Color(terrain.color, 0.5))
+	elif fill_button.button_pressed:
+		tiles = _get_fill_cells(current_position)
+		if tiles.size() > MAX_CANVAS_RENDER_TILES:
+			tiles.resize(MAX_CANVAS_RENDER_TILES)
+	else:
+		tiles.append(current_position)
+	
+	var shape = BetterTerrain.data.cell_polygon(tileset)
+	for t in tiles:
+		var tile_transform := Transform2D(0.0, tilemap.tile_set.tile_size, 0.0, tilemap.map_to_local(t))
+		overlay.draw_colored_polygon(transform * tile_transform * shape, Color(terrain.color, 0.5))
+
+
+func canvas_input(event: InputEvent) -> bool:
+	if selected_entry < 0:
+		return false
+	
+	draw_overlay = true
+	if event is InputEventMouseMotion:
+		var tr := canvas_tilemap_transform()
+		var pos := tr.affine_inverse() * Vector2(event.position)
+		var event_position := tilemap.local_to_map(pos)
+		prev_position = current_position
+		if event_position == current_position:
+			return false
+		current_position = event_position
+		update_overlay.emit()
+	
+	var replace_mode = replace_button.button_pressed
+	
+	var released : bool = event is InputEventMouseButton and !event.pressed
+	if released:
+		terrain_undo.finish_action()
+		var type = selected_entry
+		if paint_action == PaintAction.RECT and paint_mode != PaintMode.NO_PAINT:
+			var area := Rect2i(initial_click, current_position - initial_click).abs()
+			# Fill from initial_target to target
+			undo_manager.create_action(tr("Draw terrain rectangle"), UndoRedo.MERGE_DISABLE, tilemap)
+			for y in range(area.position.y, area.end.y + 1):
+				for x in range(area.position.x, area.end.x + 1):
+					var coord := Vector2i(x, y)
+					if paint_mode == PaintMode.PAINT:
+						if replace_mode:
+							undo_manager.add_do_method(BetterTerrain, &"replace_cell", tilemap, coord, type)
+						else:
+							undo_manager.add_do_method(BetterTerrain, &"set_cell", tilemap, coord, type)
+					else:
+						undo_manager.add_do_method(tilemap, &"erase_cell", coord)
+			
+			undo_manager.add_do_method(BetterTerrain, &"update_terrain_area", tilemap, area)
+			terrain_undo.create_tile_restore_point_area(undo_manager, tilemap, area)
+			undo_manager.commit_action()
+			update_overlay.emit()
+		elif paint_action == PaintAction.LINE and paint_mode != PaintMode.NO_PAINT:
+			undo_manager.create_action(tr("Draw terrain line"), UndoRedo.MERGE_DISABLE, tilemap)
+			var cells := _get_tileset_line(initial_click, current_position, tileset)
+			if paint_mode == PaintMode.PAINT:
+				if replace_mode:
+					undo_manager.add_do_method(BetterTerrain, &"replace_cells", tilemap, cells, type)
+				else:
+					undo_manager.add_do_method(BetterTerrain, &"set_cells", tilemap, cells, type)
+			elif paint_mode == PaintMode.ERASE:
+				for c in cells:
+					undo_manager.add_do_method(tilemap, &"erase_cell", c)
+			undo_manager.add_do_method(BetterTerrain, &"update_terrain_cells", tilemap, cells)
+			terrain_undo.create_tile_restore_point(undo_manager, tilemap, cells)
+			undo_manager.commit_action()
+			update_overlay.emit()
+		
+		paint_mode = PaintMode.NO_PAINT
+		return true
+	
+	var clicked : bool = event is InputEventMouseButton and event.pressed
+	if clicked:
+		paint_mode = PaintMode.NO_PAINT
+		
+		if (event.is_command_or_control_pressed() and !event.shift_pressed):
+			var pick = BetterTerrain.get_cell(tilemap, current_position)
+			if pick >= 0:
+				terrain_list.get_children()[pick]._on_focus_entered()
+				#_on_entry_select(pick)
+			return true
+		
+		paint_action = PaintAction.NO_ACTION
+		if rectangle_button.button_pressed:
+			paint_action = PaintAction.RECT
+		elif line_button.button_pressed:
+			paint_action = PaintAction.LINE
+		elif draw_button.button_pressed:
+			if event.shift_pressed:
+				paint_action = PaintAction.LINE
+				if event.is_command_or_control_pressed():
+					paint_action = PaintAction.RECT
+		
+		if event.button_index == MOUSE_BUTTON_LEFT:
+			paint_mode = PaintMode.PAINT
+		elif event.button_index == MOUSE_BUTTON_RIGHT:
+			paint_mode = PaintMode.ERASE
+		else:
+			return false
+	
+	if (clicked or event is InputEventMouseMotion) and paint_mode != PaintMode.NO_PAINT:
+		if clicked:
+			initial_click = current_position
+			terrain_undo.action_index += 1
+			terrain_undo.action_count = 0
+		var type = selected_entry
+		
+		if paint_action == PaintAction.LINE or paint_action == PaintAction.RECT:
+			# if painting as line, execution happens on release. 
+			# prevent other painting actions from running.
+			pass
+		elif draw_button.button_pressed:
+			undo_manager.create_action(tr("Draw terrain") + str(terrain_undo.action_index), UndoRedo.MERGE_ALL, tilemap, true)
+			var cells := _get_tileset_line(prev_position, current_position, tileset)
+			if paint_mode == PaintMode.PAINT:
+				if replace_mode:
+					terrain_undo.add_do_method(undo_manager, BetterTerrain, &"replace_cells", [tilemap, cells, type])
+				else:
+					terrain_undo.add_do_method(undo_manager, BetterTerrain, &"set_cells", [tilemap, cells, type])
+			elif paint_mode == PaintMode.ERASE:
+				for c in cells:
+					terrain_undo.add_do_method(undo_manager, tilemap, &"erase_cell", [c])
+			terrain_undo.add_do_method(undo_manager, BetterTerrain, &"update_terrain_cells", [tilemap, cells])
+			terrain_undo.create_tile_restore_point(undo_manager, tilemap, cells)
+			undo_manager.commit_action()
+			terrain_undo.action_count += 1
+		elif fill_button.button_pressed:
+			var cells := _get_fill_cells(current_position)
+			undo_manager.create_action(tr("Fill terrain"), UndoRedo.MERGE_DISABLE, tilemap)
+			if paint_mode == PaintMode.PAINT:
+				if replace_mode:
+					undo_manager.add_do_method(BetterTerrain, &"replace_cells", tilemap, cells, type)
+				else:
+					undo_manager.add_do_method(BetterTerrain, &"set_cells", tilemap, cells, type)
+			elif paint_mode == PaintMode.ERASE:
+				for c in cells:
+					undo_manager.add_do_method(tilemap, &"erase_cell", c)
+			undo_manager.add_do_method(BetterTerrain, &"update_terrain_cells", tilemap, cells)
+			terrain_undo.create_tile_restore_point(undo_manager, tilemap, cells)
+			undo_manager.commit_action()
+		
+		update_overlay.emit()
+		return true
+	
+	return false
+
+
+func canvas_mouse_exit() -> void:
+	draw_overlay = false
+	update_overlay.emit()
+
+
+func _shortcut_input(event) -> void:
+	if event is InputEventKey:
+		if event.keycode == KEY_C and (event.is_command_or_control_pressed() and not event.echo):
+			get_viewport().set_input_as_handled()
+			tile_view.copy_selection()
+		if event.keycode == KEY_V and (event.is_command_or_control_pressed() and not event.echo):
+			get_viewport().set_input_as_handled()
+			tile_view.paste_selection()
+
+
+## bresenham alg ported from Geometry2D::bresenham_line()
+func _get_line(from:Vector2i, to:Vector2i) -> Array[Vector2i]:
+	if from == to:
+		return [to]
+	
+	var points:Array[Vector2i] = []
+	var delta := (to - from).abs() * 2
+	var step := (to - from).sign()
+	var current := from
+	
+	if delta.x > delta.y:
+		var err:int = delta.x / 2
+		while current.x != to.x:
+			points.push_back(current);
+			err -= delta.y
+			if err < 0:
+				current.y += step.y
+				err += delta.x
+			current.x += step.x
+	else:
+		var err:int = delta.y / 2
+		while current.y != to.y:
+			points.push_back(current)
+			err -= delta.x
+			if err < 0:
+				current.x += step.x
+				err += delta.y
+			current.y += step.y
+	
+	points.push_back(current);
+	return points;
+
+
+## half-offset bresenham alg ported from TileMapEditor::get_line
+func _get_tileset_line(from:Vector2i, to:Vector2i, tileset:TileSet) -> Array[Vector2i]:
+	if tileset.tile_shape == TileSet.TILE_SHAPE_SQUARE:
+		return _get_line(from, to)
+	
+	var points:Array[Vector2i] = []
+	
+	var transposed := tileset.get_tile_offset_axis() == TileSet.TILE_OFFSET_AXIS_VERTICAL
+	if transposed:
+		from = Vector2i(from.y, from.x)
+		to = Vector2i(to.y, to.x)
+
+	var delta:Vector2i = to - from
+	delta = Vector2i(2 * delta.x + abs(posmod(to.y, 2)) - abs(posmod(from.y, 2)), delta.y)
+	var sign:Vector2i = delta.sign()
+
+	var current := from;
+	points.push_back(Vector2i(current.y, current.x) if transposed else current)
+
+	var err := 0
+	if abs(delta.y) < abs(delta.x):
+		var err_step:Vector2i = 3 * delta.abs()
+		while current != to:
+			err += err_step.y
+			if err > abs(delta.x):
+				if sign.x == 0:
+					current += Vector2i(sign.y, 0)
+				else:
+					current += Vector2i(sign.x if bool(current.y % 2) != (sign.x < 0) else 0, sign.y)
+				err -= err_step.x
+			else:
+				current += Vector2i(sign.x, 0)
+				err += err_step.y
+			points.push_back(Vector2i(current.y, current.x) if transposed else current)
+	else:
+		var err_step:Vector2i = delta.abs()
+		while current != to:
+			err += err_step.x
+			if err > 0:
+				if sign.x == 0:
+					current += Vector2i(0, sign.y)
+				else:
+					current += Vector2i(sign.x if bool(current.y % 2) != (sign.x < 0) else 0, sign.y)
+				err -= err_step.y;
+			else:
+				if sign.x == 0:
+					current += Vector2i(0, sign.y)
+				else:
+					current += Vector2i(-sign.x if bool(current.y % 2) != (sign.x > 0) else 0, sign.y)
+				err += err_step.y
+			points.push_back(Vector2i(current.y, current.x) if transposed else current)
+	
+	return points
+
+
+func _on_terrain_enable_id_pressed(id):
+	if id in [SourceSelectors.ALL, SourceSelectors.NONE]:
+		for i in source_selector_popup.item_count:
+			if source_selector_popup.is_item_checkable(i):
+				source_selector_popup.set_item_checked(i, id == SourceSelectors.ALL)
+	else:
+		var index = source_selector_popup.get_item_index(id)
+		var checked = source_selector_popup.is_item_checked(index)
+		source_selector_popup.set_item_checked(index, !checked)
+	
+	var disabled_sources : Array[int]
+	for i in source_selector_popup.item_count:
+		if source_selector_popup.is_item_checkable(i) and !source_selector_popup.is_item_checked(i):
+			disabled_sources.append(source_selector_popup.get_item_id(i))
+	tile_view.disabled_sources = disabled_sources
+
+
+func corresponding_tilemap_editor_button(similar: Button) -> Button:
+	var editors = EditorInterface.get_base_control().find_children("*", "TileMapLayerEditor", true, false)
+	var tile_map_layer_editor = editors[0]
+	var buttons = tile_map_layer_editor.find_children("*", "Button", true, false)
+	for button: Button in buttons:
+		if button.icon == similar.icon:
+			return button
+	return null
+
+
+func _on_layer_up_or_down_pressed(button: Button) -> void:
+	var matching_button = corresponding_tilemap_editor_button(button)
+	if !matching_button:
+		return
+	
+	# Major hack, to reduce flicker hide the tileset editor briefly
+	var editors = EditorInterface.get_base_control().find_children("*", "TileSetEditor", true, false)
+	var tile_set_editor = editors[0]
+	
+	matching_button.pressed.emit()
+	tile_set_editor.modulate = Color.TRANSPARENT
+	await get_tree().process_frame
+	await get_tree().process_frame
+	force_show_terrains.emit()
+	tile_set_editor.modulate = Color.WHITE
+
+
+
+func _on_layer_up_pressed() -> void:
+	_on_layer_up_or_down_pressed(layer_up)
+
+
+func _on_layer_down_pressed() -> void:
+	_on_layer_up_or_down_pressed(layer_down)
+
+
+func _on_layer_highlight_toggled(toggled: bool) -> void:
+	var settings = EditorInterface.get_editor_settings()
+	settings.set_setting("editors/tiles_editor/highlight_selected_layer", toggled)
+	
+	var highlight = corresponding_tilemap_editor_button(layer_highlight)
+	if highlight:
+		highlight.toggled.emit(toggled)
+
+
+func _on_layer_grid_toggled(toggled: bool) -> void:
+	var settings = EditorInterface.get_editor_settings()
+	settings.set_setting("editors/tiles_editor/display_grid", toggled)
+	
+	var grid = corresponding_tilemap_editor_button(layer_grid)
+	if grid:
+		grid.toggled.emit(toggled)

addons/better-terrain/editor/Dock.gd.uid

@@ -0,0 +1 @@
+uid://ynajlxcomlkc

addons/better-terrain/editor/Dock.tscn

@@ -0,0 +1,399 @@
+[gd_scene load_steps=32 format=3 uid="uid://de8b6h6ieal7r"]
+
+[ext_resource type="Script" uid="uid://ynajlxcomlkc" path="res://addons/better-terrain/editor/Dock.gd" id="1_raoha"]
+[ext_resource type="Texture2D" uid="uid://c6lxq2y7mpb18" path="res://addons/better-terrain/icons/EditType.svg" id="2_cpm2t"]
+[ext_resource type="Texture2D" uid="uid://y3xy6qdckht6" path="res://addons/better-terrain/icons/Replace.svg" id="2_fvmt6"]
+[ext_resource type="Texture2D" uid="uid://bo2cjv08jkvf8" path="res://addons/better-terrain/icons/EditTerrain.svg" id="3_pqb1p"]
+[ext_resource type="Texture2D" uid="uid://b0es228gfcykd" path="res://addons/better-terrain/icons/Warning.svg" id="4_6ahwe"]
+[ext_resource type="Script" uid="uid://cpm7dq6r0n0sn" path="res://addons/better-terrain/editor/TileView.gd" id="4_nqppq"]
+[ext_resource type="Texture2D" uid="uid://co6gwwmog0pjy" path="res://addons/better-terrain/icons/EditSymmetry.svg" id="5_kfjwu"]
+[ext_resource type="Texture2D" uid="uid://cs4mdmluiydj6" path="res://addons/better-terrain/icons/ShuffleRandom.svg" id="5_n3owo"]
+[ext_resource type="Texture2D" uid="uid://5hm3bfj3dvej" path="res://addons/better-terrain/icons/SymmetryMirror.svg" id="6_mofuh"]
+[ext_resource type="Texture2D" uid="uid://dqmc1jp56or8m" path="res://addons/better-terrain/icons/SymmetryFlip.svg" id="7_ojxs0"]
+[ext_resource type="Texture2D" uid="uid://cxoewno1cefua" path="res://addons/better-terrain/icons/SymmetryReflect.svg" id="8_8dhyg"]
+[ext_resource type="Texture2D" uid="uid://baxhjy28r1iqj" path="res://addons/better-terrain/icons/SymmetryRotateClockwise.svg" id="9_tq76a"]
+[ext_resource type="Texture2D" uid="uid://csbwdkr6bc2db" path="res://addons/better-terrain/icons/SymmetryRotateCounterClockwise.svg" id="10_o5h1f"]
+[ext_resource type="Texture2D" uid="uid://8mcycyl3e66r" path="res://addons/better-terrain/icons/SymmetryRotate180.svg" id="11_m6syp"]
+[ext_resource type="Texture2D" uid="uid://b7fx4mk18lmls" path="res://addons/better-terrain/icons/SymmetryRotateAll.svg" id="12_11vru"]
+[ext_resource type="Texture2D" uid="uid://cyjra4g05dwh" path="res://addons/better-terrain/icons/SymmetryAll.svg" id="13_lp5m2"]
+
+[sub_resource type="ButtonGroup" id="ButtonGroup_aon7c"]
+
+[sub_resource type="InputEventKey" id="InputEventKey_saph6"]
+device = -1
+keycode = 68
+unicode = 100
+
+[sub_resource type="Shortcut" id="Shortcut_3k2al"]
+events = [SubResource("InputEventKey_saph6")]
+
+[sub_resource type="SVGTexture" id="SVGTexture_nkf6h"]
+_source = "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"16\" height=\"16\"><path fill=\"#ff5d5d\" d=\"M2 1v8.586l1.293-1.293a1 1 0 0 1 1.414 0L7 10.587l2.293-2.293a1 1 0 0 1 1.414 0L13 10.586l1-1V6H9V1H2zm8 0v4h4zm-6 9.414-2 2V15h12v-2.586l-.293.293a1 1 0 0 1-1.414 0L10 10.414l-2.293 2.293a1 1 0 0 1-1.414 0L4 10.414z\"/></svg>
+"
+
+[sub_resource type="InputEventKey" id="InputEventKey_q1v0d"]
+device = -1
+keycode = 76
+unicode = 108
+
+[sub_resource type="Shortcut" id="Shortcut_wc6bu"]
+events = [SubResource("InputEventKey_q1v0d")]
+
+[sub_resource type="InputEventKey" id="InputEventKey_68n3h"]
+device = -1
+keycode = 82
+unicode = 114
+
+[sub_resource type="InputEventKey" id="InputEventKey_qcu1e"]
+device = -1
+keycode = 67
+unicode = 99
+
+[sub_resource type="Shortcut" id="Shortcut_tcjet"]
+events = [SubResource("InputEventKey_68n3h"), SubResource("InputEventKey_qcu1e")]
+
+[sub_resource type="InputEventKey" id="InputEventKey_grxy4"]
+device = -1
+keycode = 66
+unicode = 98
+
+[sub_resource type="Shortcut" id="Shortcut_46fac"]
+events = [SubResource("InputEventKey_grxy4")]
+
+[sub_resource type="InputEventKey" id="InputEventKey_xd61m"]
+device = -1
+keycode = 80
+unicode = 112
+
+[sub_resource type="Shortcut" id="Shortcut_uwwa1"]
+events = [SubResource("InputEventKey_xd61m")]
+
+[sub_resource type="ButtonGroup" id="ButtonGroup_3wrxn"]
+allow_unpress = true
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_mpeb7"]
+bg_color = Color(0, 0, 0, 0.4)
+
+[node name="Dock" type="Control" node_paths=PackedStringArray("shortcut_context")]
+custom_minimum_size = Vector2(0, 100)
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+focus_mode = 2
+shortcut_context = NodePath(".")
+script = ExtResource("1_raoha")
+
+[node name="VBox" type="VBoxContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="Toolbar" type="HBoxContainer" parent="VBox"]
+layout_mode = 2
+
+[node name="Draw" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Draw terrain
+Shift: Draw line.
+Ctrl/Cmd+Shift: Draw rectangle."
+toggle_mode = true
+button_pressed = true
+button_group = SubResource("ButtonGroup_aon7c")
+shortcut = SubResource("Shortcut_3k2al")
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="Line" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Draw line"
+toggle_mode = true
+button_group = SubResource("ButtonGroup_aon7c")
+shortcut = SubResource("Shortcut_wc6bu")
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="Rectangle" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Fill a rectangle of terrain"
+toggle_mode = true
+button_group = SubResource("ButtonGroup_aon7c")
+shortcut = SubResource("Shortcut_tcjet")
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="Fill" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Bucket fill terrain"
+toggle_mode = true
+button_group = SubResource("ButtonGroup_aon7c")
+shortcut = SubResource("Shortcut_46fac")
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="Replace" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Toggle replace mode"
+toggle_mode = true
+shortcut = SubResource("Shortcut_uwwa1")
+icon = ExtResource("2_fvmt6")
+
+[node name="VSeparator" type="VSeparator" parent="VBox/Toolbar"]
+layout_mode = 2
+
+[node name="SelectTiles" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Select"
+toggle_mode = true
+button_group = SubResource("ButtonGroup_3wrxn")
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="PaintType" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Paint terrain types"
+toggle_mode = true
+button_group = SubResource("ButtonGroup_3wrxn")
+icon = ExtResource("2_cpm2t")
+flat = true
+
+[node name="PaintTerrain" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Paint terrain connecting types"
+toggle_mode = true
+button_group = SubResource("ButtonGroup_3wrxn")
+icon = ExtResource("3_pqb1p")
+flat = true
+
+[node name="PaintSymmetry" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Paint tile symmetry"
+toggle_mode = true
+button_group = SubResource("ButtonGroup_3wrxn")
+icon = ExtResource("5_kfjwu")
+flat = true
+
+[node name="SymmetryOptions" type="OptionButton" parent="VBox/Toolbar"]
+visible = false
+custom_minimum_size = Vector2(100, 0)
+layout_mode = 2
+selected = 0
+item_count = 9
+popup/item_0/text = "No symmetry"
+popup/item_0/id = 8
+popup/item_1/text = "Mirror"
+popup/item_1/icon = ExtResource("6_mofuh")
+popup/item_1/id = 1
+popup/item_2/text = "Flip"
+popup/item_2/icon = ExtResource("7_ojxs0")
+popup/item_2/id = 1
+popup/item_3/text = "Reflect"
+popup/item_3/icon = ExtResource("8_8dhyg")
+popup/item_3/id = 2
+popup/item_4/text = "Rotate clockwise"
+popup/item_4/icon = ExtResource("9_tq76a")
+popup/item_4/id = 3
+popup/item_5/text = "Rotate counter-clockwise"
+popup/item_5/icon = ExtResource("10_o5h1f")
+popup/item_5/id = 4
+popup/item_6/text = "Rotate 180"
+popup/item_6/icon = ExtResource("11_m6syp")
+popup/item_6/id = 5
+popup/item_7/text = "All rotations"
+popup/item_7/icon = ExtResource("12_11vru")
+popup/item_7/id = 6
+popup/item_8/text = "All reflections & rotations"
+popup/item_8/icon = ExtResource("13_lp5m2")
+popup/item_8/id = 7
+
+[node name="VSeparator3" type="VSeparator" parent="VBox/Toolbar"]
+layout_mode = 2
+
+[node name="ZoomContainer" type="VBoxContainer" parent="VBox/Toolbar"]
+layout_mode = 2
+alignment = 1
+
+[node name="Sources" type="MenuBar" parent="VBox/Toolbar"]
+layout_mode = 2
+
+[node name="Sources" type="PopupMenu" parent="VBox/Toolbar/Sources"]
+auto_translate_mode = 2
+auto_translate = false
+hide_on_item_selection = false
+hide_on_checkable_item_selection = false
+
+[node name="Spacer" type="Control" parent="VBox/Toolbar"]
+layout_mode = 2
+size_flags_horizontal = 3
+
+[node name="ShuffleRandom" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Shuffle random tiles each update"
+toggle_mode = true
+icon = ExtResource("5_n3owo")
+flat = true
+
+[node name="Clean" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+text = "Clean tile data"
+icon = ExtResource("4_6ahwe")
+
+[node name="VSeparator2" type="VSeparator" parent="VBox/Toolbar"]
+layout_mode = 2
+
+[node name="LayerUp" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Select previous layer"
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="LayerDown" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Select next layer"
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="LayerHighlight" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Highlight selected layer"
+toggle_mode = true
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="LayerGrid" type="Button" parent="VBox/Toolbar"]
+layout_mode = 2
+tooltip_text = "Toggle grid visibility"
+toggle_mode = true
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="HSplit" type="HSplitContainer" parent="VBox"]
+layout_mode = 2
+size_flags_vertical = 3
+split_offset = 325
+
+[node name="Terrains" type="VBoxContainer" parent="VBox/HSplit"]
+layout_mode = 2
+
+[node name="Panel" type="PanelContainer" parent="VBox/HSplit/Terrains"]
+layout_mode = 2
+size_flags_vertical = 3
+theme_override_styles/panel = SubResource("StyleBoxFlat_mpeb7")
+
+[node name="ScrollContainer" type="ScrollContainer" parent="VBox/HSplit/Terrains/Panel"]
+layout_mode = 2
+horizontal_scroll_mode = 3
+
+[node name="TerrainList" type="HFlowContainer" parent="VBox/HSplit/Terrains/Panel/ScrollContainer"]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 3
+
+[node name="LowerToolbar" type="HBoxContainer" parent="VBox/HSplit/Terrains"]
+layout_mode = 2
+
+[node name="GridMode" type="Button" parent="VBox/HSplit/Terrains/LowerToolbar"]
+layout_mode = 2
+tooltip_text = "Toggle grid view"
+toggle_mode = true
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="QuickMode" type="Button" parent="VBox/HSplit/Terrains/LowerToolbar"]
+auto_translate_mode = 1
+layout_mode = 2
+tooltip_text = "Toggle quick mode. Only shows paintable terrain types."
+toggle_mode = true
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="VSeparator" type="VSeparator" parent="VBox/HSplit/Terrains/LowerToolbar"]
+layout_mode = 2
+
+[node name="EditTools" type="HBoxContainer" parent="VBox/HSplit/Terrains/LowerToolbar"]
+layout_mode = 2
+size_flags_horizontal = 3
+alignment = 2
+
+[node name="AddTerrain" type="Button" parent="VBox/HSplit/Terrains/LowerToolbar/EditTools"]
+layout_mode = 2
+tooltip_text = "Add terrain type"
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="EditTerrain" type="Button" parent="VBox/HSplit/Terrains/LowerToolbar/EditTools"]
+layout_mode = 2
+tooltip_text = "Edit terrain type"
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="PickIcon" type="Button" parent="VBox/HSplit/Terrains/LowerToolbar/EditTools"]
+layout_mode = 2
+tooltip_text = "Pick terrain icon from tileset"
+toggle_mode = true
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="MoveUp" type="Button" parent="VBox/HSplit/Terrains/LowerToolbar/EditTools"]
+layout_mode = 2
+tooltip_text = "Move selected terrain up"
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="MoveDown" type="Button" parent="VBox/HSplit/Terrains/LowerToolbar/EditTools"]
+layout_mode = 2
+tooltip_text = "Move selected terrain down"
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="RemoveTerrain" type="Button" parent="VBox/HSplit/Terrains/LowerToolbar/EditTools"]
+layout_mode = 2
+tooltip_text = "Remove selected terrain type(s)"
+icon = SubResource("SVGTexture_nkf6h")
+flat = true
+
+[node name="Panel" type="Panel" parent="VBox/HSplit"]
+custom_minimum_size = Vector2(0, 80)
+layout_mode = 2
+
+[node name="ScrollArea" type="ScrollContainer" parent="VBox/HSplit/Panel"]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+size_flags_horizontal = 3
+
+[node name="TileView" type="Control" parent="VBox/HSplit/Panel/ScrollArea"]
+texture_filter = 1
+texture_repeat = 1
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 3
+focus_mode = 2
+script = ExtResource("4_nqppq")
+
+[connection signal="item_selected" from="VBox/Toolbar/SymmetryOptions" to="." method="_on_symmetry_selected"]
+[connection signal="id_pressed" from="VBox/Toolbar/Sources/Sources" to="." method="_on_terrain_enable_id_pressed"]
+[connection signal="pressed" from="VBox/Toolbar/ShuffleRandom" to="." method="_on_shuffle_random_pressed"]
+[connection signal="pressed" from="VBox/Toolbar/Clean" to="." method="_on_clean_pressed"]
+[connection signal="pressed" from="VBox/Toolbar/LayerUp" to="." method="_on_layer_up_pressed"]
+[connection signal="pressed" from="VBox/Toolbar/LayerDown" to="." method="_on_layer_down_pressed"]
+[connection signal="toggled" from="VBox/Toolbar/LayerHighlight" to="." method="_on_layer_highlight_toggled"]
+[connection signal="toggled" from="VBox/Toolbar/LayerGrid" to="." method="_on_layer_grid_toggled"]
+[connection signal="pressed" from="VBox/HSplit/Terrains/LowerToolbar/GridMode" to="." method="_on_grid_mode_pressed"]
+[connection signal="pressed" from="VBox/HSplit/Terrains/LowerToolbar/QuickMode" to="." method="_on_quick_mode_pressed"]
+[connection signal="pressed" from="VBox/HSplit/Terrains/LowerToolbar/EditTools/AddTerrain" to="." method="_on_add_terrain_pressed"]
+[connection signal="pressed" from="VBox/HSplit/Terrains/LowerToolbar/EditTools/EditTerrain" to="." method="_on_edit_terrain_pressed"]
+[connection signal="focus_exited" from="VBox/HSplit/Terrains/LowerToolbar/EditTools/PickIcon" to="." method="_on_pick_icon_focus_exited"]
+[connection signal="pressed" from="VBox/HSplit/Terrains/LowerToolbar/EditTools/PickIcon" to="." method="_on_pick_icon_pressed"]
+[connection signal="pressed" from="VBox/HSplit/Terrains/LowerToolbar/EditTools/MoveUp" to="." method="_on_move_pressed" binds= [false]]
+[connection signal="pressed" from="VBox/HSplit/Terrains/LowerToolbar/EditTools/MoveDown" to="." method="_on_move_pressed" binds= [true]]
+[connection signal="pressed" from="VBox/HSplit/Terrains/LowerToolbar/EditTools/RemoveTerrain" to="." method="_on_remove_terrain_pressed"]
+[connection signal="mouse_exited" from="VBox/HSplit/Panel/ScrollArea/TileView" to="VBox/HSplit/Panel/ScrollArea/TileView" method="clear_highlighted_tile"]

addons/better-terrain/editor/TerrainEntry.gd

@@ -0,0 +1,185 @@
+@tool
+extends PanelContainer
+
+signal select(index)
+
+@onready var color_panel := %Color
+@onready var terrain_icon_slot := %TerrainIcon
+@onready var type_icon_slot := %TypeIcon
+@onready var type_icon_panel := %TerrainIconPanel
+@onready var name_label := %Name
+@onready var layout_container := %Layout
+@onready var icon_layout_container := %IconLayout
+
+var selected := false
+
+var tileset:TileSet
+var terrain:Dictionary
+
+var grid_mode := false
+var color_style_list:StyleBoxFlat
+var color_style_grid:StyleBoxFlat
+var color_style_decoration:StyleBoxFlat
+
+var _terrain_texture:Texture2D
+var _terrain_texture_rect:Rect2i
+var _icon_draw_connected := false
+
+
+func _ready():
+	update()
+
+func update():
+	if !terrain or !terrain.valid:
+		return
+	if !tileset:
+		return
+	
+	name_label.text = terrain.name
+	tooltip_text = "%s (%d)" % [terrain.name, terrain.id]
+	
+	color_style_list = color_panel.get_theme_stylebox("panel").duplicate()
+	color_style_grid = color_panel.get_theme_stylebox("panel").duplicate()
+	color_style_decoration = color_panel.get_theme_stylebox("panel").duplicate()
+	
+	color_style_list.bg_color = terrain.color
+	color_style_list.corner_radius_top_left = 8
+	color_style_list.corner_radius_bottom_left = 8
+	color_style_list.corner_radius_top_right = 0
+	color_style_list.corner_radius_bottom_right = 0
+	color_style_list.content_margin_left = -1
+	color_style_list.content_margin_right = -1
+	color_style_list.border_width_left = 0
+	color_style_list.border_width_right = 0
+	color_style_list.border_width_top = 0
+	color_style_list.border_width_bottom = 0
+	
+	color_style_grid.bg_color = terrain.color
+	color_style_grid.corner_radius_top_left = 6
+	color_style_grid.corner_radius_bottom_left = 6
+	color_style_grid.corner_radius_top_right = 6
+	color_style_grid.corner_radius_bottom_right = 6
+	color_style_grid.content_margin_left = -1
+	color_style_grid.content_margin_right = -1
+	color_style_grid.border_width_left = 0
+	color_style_grid.border_width_right = 0
+	color_style_grid.border_width_top = 0
+	color_style_grid.border_width_bottom = 0
+	
+	color_style_decoration.bg_color = terrain.color
+	color_style_decoration.corner_radius_top_left = 8
+	color_style_decoration.corner_radius_bottom_left = 8
+	color_style_decoration.corner_radius_top_right = 8
+	color_style_decoration.corner_radius_bottom_right = 8
+	color_style_decoration.content_margin_left = -1
+	color_style_decoration.content_margin_right = -1
+	color_style_decoration.border_width_left = 4
+	color_style_decoration.border_width_right = 4
+	color_style_decoration.border_width_top = 4
+	color_style_decoration.border_width_bottom = 4
+	
+	match terrain.type:
+		BetterTerrain.TerrainType.MATCH_TILES:
+			type_icon_slot.texture = load("res://addons/better-terrain/icons/MatchTiles.svg")
+		BetterTerrain.TerrainType.MATCH_VERTICES:
+			type_icon_slot.texture = load("res://addons/better-terrain/icons/MatchVertices.svg")
+		BetterTerrain.TerrainType.CATEGORY:
+			type_icon_slot.texture = load("res://addons/better-terrain/icons/NonModifying.svg")
+		BetterTerrain.TerrainType.DECORATION:
+			type_icon_slot.texture = load("res://addons/better-terrain/icons/Decoration.svg")
+	
+	var has_icon = false
+	if terrain.has("icon"):
+		if terrain.icon.has("path") and not terrain.icon.path.is_empty():
+			terrain_icon_slot.texture = load(terrain.icon.path)
+			_terrain_texture = null
+			terrain_icon_slot.queue_redraw()
+			has_icon = true
+		elif terrain.icon.has("source_id") and tileset.has_source(terrain.icon.source_id):
+			var source := tileset.get_source(terrain.icon.source_id) as TileSetAtlasSource
+			var coord := terrain.icon.coord as Vector2i
+			var rect := source.get_tile_texture_region(coord, 0)
+			_terrain_texture = source.texture
+			_terrain_texture_rect = rect
+			terrain_icon_slot.queue_redraw()
+			has_icon = true
+	
+	if not has_icon:
+		var tiles = BetterTerrain.get_tile_sources_in_terrain(tileset, get_index())
+		if tiles.size() > 0:
+			var source := tiles[0].source as TileSetAtlasSource
+			var coord := tiles[0].coord as Vector2i
+			var rect := source.get_tile_texture_region(coord, 0)
+			_terrain_texture = source.texture
+			_terrain_texture_rect = rect
+			terrain_icon_slot.queue_redraw()
+	
+	if _terrain_texture:
+		terrain_icon_slot.texture = null
+	
+	if not _icon_draw_connected:
+		terrain_icon_slot.connect("draw", func():
+			if _terrain_texture:
+				terrain_icon_slot.draw_texture_rect_region(_terrain_texture, Rect2i(0,0, 44, 44), _terrain_texture_rect)
+		)
+		_icon_draw_connected = true
+	
+	update_style()
+
+
+func update_style():
+	if terrain.type == BetterTerrain.TerrainType.DECORATION:
+		type_icon_panel.visible = false
+		color_panel.custom_minimum_size = Vector2i(52,52)
+	else:
+		type_icon_panel.visible = true
+		color_panel.custom_minimum_size = Vector2i(24,24)
+			
+	if grid_mode:
+		if terrain.type == BetterTerrain.TerrainType.DECORATION:
+			color_panel.add_theme_stylebox_override("panel", color_style_decoration)
+			color_panel.size_flags_vertical = Control.SIZE_FILL
+			icon_layout_container.size_flags_vertical = Control.SIZE_EXPAND_FILL
+		else:
+			color_panel.add_theme_stylebox_override("panel", color_style_grid)
+			color_panel.size_flags_vertical = Control.SIZE_SHRINK_BEGIN
+			icon_layout_container.size_flags_vertical = Control.SIZE_FILL
+		custom_minimum_size = Vector2(0, 60)
+		size_flags_horizontal = Control.SIZE_FILL
+		layout_container.vertical = true
+		name_label.visible = false
+		icon_layout_container.add_theme_constant_override("separation", -24)
+	else:
+		if terrain.type == BetterTerrain.TerrainType.DECORATION:
+			color_panel.add_theme_stylebox_override("panel", color_style_decoration)
+		else:
+			color_panel.add_theme_stylebox_override("panel", color_style_list)
+		icon_layout_container.size_flags_vertical = Control.SIZE_FILL
+		custom_minimum_size = Vector2(2000, 60)
+		size_flags_horizontal = Control.SIZE_EXPAND_FILL
+		layout_container.vertical = false
+		name_label.visible = true
+		color_panel.size_flags_vertical = Control.SIZE_FILL
+		icon_layout_container.add_theme_constant_override("separation", 4)
+
+
+func set_selected(value:bool = true):
+	selected = value
+	if value:
+		select.emit(get_index())
+	queue_redraw()
+
+
+func _draw():
+	if selected:
+		draw_rect(Rect2(Vector2.ZERO, get_rect().size), Color(0.15, 0.70, 1, 0.3))
+
+
+func _on_focus_entered():
+	queue_redraw()
+	selected = true
+	select.emit(get_index())
+
+
+func _on_focus_exited():
+	queue_redraw()

addons/better-terrain/editor/TerrainEntry.gd.uid

@@ -0,0 +1 @@
+uid://c2qfovpuj58b7

addons/better-terrain/editor/TerrainEntry.tscn

@@ -0,0 +1,114 @@
+[gd_scene load_steps=8 format=3 uid="uid://u2y444hj182c"]
+
+[ext_resource type="Script" uid="uid://c2qfovpuj58b7" path="res://addons/better-terrain/editor/TerrainEntry.gd" id="1_o2na3"]
+[ext_resource type="Texture2D" uid="uid://kmypxsqhynyv" path="res://addons/better-terrain/icons/Decoration.svg" id="2_ossyj"]
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_3pdcc"]
+content_margin_left = 4.0
+content_margin_top = 4.0
+content_margin_right = 4.0
+content_margin_bottom = 4.0
+draw_center = false
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_dqhir"]
+bg_color = Color(0.243, 0.816, 0.518, 1)
+border_color = Color(0, 0, 0, 0.439216)
+corner_radius_top_left = 8
+corner_radius_bottom_left = 8
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_rohyw"]
+content_margin_left = 2.0
+content_margin_top = 2.0
+content_margin_right = 2.0
+content_margin_bottom = 2.0
+bg_color = Color(0, 0, 0, 0.439216)
+corner_radius_top_left = 4
+corner_radius_top_right = 4
+corner_radius_bottom_right = 4
+corner_radius_bottom_left = 4
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_xa0fl"]
+content_margin_left = 4.0
+content_margin_top = 4.0
+content_margin_right = 4.0
+content_margin_bottom = 4.0
+bg_color = Color(0, 0, 0, 0.439216)
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_b4rkm"]
+content_margin_left = 3.0
+bg_color = Color(0, 0, 0, 0.439216)
+draw_center = false
+
+[node name="TerrainEntry" type="PanelContainer"]
+custom_minimum_size = Vector2(60, 60)
+offset_right = 200.0
+offset_bottom = 60.0
+size_flags_vertical = 3
+focus_mode = 2
+theme_override_styles/panel = SubResource("StyleBoxFlat_3pdcc")
+script = ExtResource("1_o2na3")
+
+[node name="Layout" type="BoxContainer" parent="."]
+unique_name_in_owner = true
+layout_mode = 2
+theme_override_constants/separation = 4
+
+[node name="IconLayout" type="HBoxContainer" parent="Layout"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 4
+
+[node name="Color" type="PanelContainer" parent="Layout/IconLayout"]
+unique_name_in_owner = true
+z_index = 1
+custom_minimum_size = Vector2(24, 24)
+layout_mode = 2
+size_flags_horizontal = 0
+mouse_filter = 1
+theme_override_styles/panel = SubResource("StyleBoxFlat_dqhir")
+
+[node name="PanelContainer" type="PanelContainer" parent="Layout/IconLayout/Color"]
+layout_mode = 2
+size_flags_horizontal = 4
+size_flags_vertical = 4
+mouse_filter = 1
+theme_override_styles/panel = SubResource("StyleBoxFlat_rohyw")
+
+[node name="TypeIcon" type="TextureRect" parent="Layout/IconLayout/Color/PanelContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 4
+size_flags_vertical = 4
+texture = ExtResource("2_ossyj")
+
+[node name="TerrainIconPanel" type="PanelContainer" parent="Layout/IconLayout"]
+unique_name_in_owner = true
+custom_minimum_size = Vector2(52, 52)
+layout_mode = 2
+size_flags_horizontal = 4
+size_flags_vertical = 4
+mouse_filter = 1
+theme_override_styles/panel = SubResource("StyleBoxFlat_xa0fl")
+
+[node name="TerrainIcon" type="TextureRect" parent="Layout/IconLayout/TerrainIconPanel"]
+unique_name_in_owner = true
+texture_filter = 1
+custom_minimum_size = Vector2(40, 40)
+layout_mode = 2
+expand_mode = 4
+stretch_mode = 5
+
+[node name="Name" type="Label" parent="Layout"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 1
+theme_override_colors/font_outline_color = Color(0, 0, 0, 1)
+theme_override_constants/outline_size = 0
+theme_override_styles/normal = SubResource("StyleBoxFlat_b4rkm")
+text = "New Terrain"
+vertical_alignment = 1
+text_overrun_behavior = 3
+
+[connection signal="focus_entered" from="." to="." method="_on_focus_entered"]
+[connection signal="focus_exited" from="." to="." method="_on_focus_exited"]

addons/better-terrain/editor/TerrainProperties.gd

@@ -0,0 +1,85 @@
+@tool
+extends ConfirmationDialog
+
+var category_icon := load("res://addons/better-terrain/icons/NonModifying.svg")
+
+const CATEGORY_CHECK_ID = &"category_check_id"
+
+var accepted := false
+
+var terrain_name : String:
+	set(value): %NameEdit.text = value
+	get: return %NameEdit.text
+
+var terrain_color : Color:
+	set(value): %ColorPicker.color = value
+	get: return %ColorPicker.color
+
+var terrain_icon : String:
+	set(value): %IconEdit.text = value
+	get: return %IconEdit.text
+
+var terrain_type : int:
+	set(value):
+		%TypeOption.selected = value
+		_on_type_option_item_selected(value)
+	get: return %TypeOption.selected
+
+var terrain_categories : Array: set = set_categories, get = get_categories
+
+
+# category is name, color, id
+func set_category_data(options: Array) -> void:
+	if !options.is_empty():
+		%CategoryLabel.show()
+		%CategoryContainer.show()
+	
+	for o in options:
+		var c = CheckBox.new()
+		c.text = o.name
+		c.icon = category_icon
+		c.add_theme_color_override(&"icon_normal_color", o.color)
+		c.add_theme_color_override(&"icon_disabled_color", Color(o.color, 0.4))
+		c.add_theme_color_override(&"icon_focus_color", o.color)
+		c.add_theme_color_override(&"icon_hover_color", o.color)
+		c.add_theme_color_override(&"icon_hover_pressed_color", o.color)
+		c.add_theme_color_override(&"icon_normal_color", o.color)
+		c.add_theme_color_override(&"icon_pressed_color", o.color)
+		
+		c.set_meta(CATEGORY_CHECK_ID, o.id)
+		%CategoryLayout.add_child(c)
+
+
+func set_categories(ids : Array):
+	for c in %CategoryLayout.get_children():
+		c.button_pressed = c.get_meta(CATEGORY_CHECK_ID) in ids
+
+
+func get_categories() -> Array:
+	var result := []
+	if terrain_type == BetterTerrain.TerrainType.CATEGORY:
+		return result
+	for c in %CategoryLayout.get_children():
+		if c.button_pressed:
+			result.push_back(c.get_meta(CATEGORY_CHECK_ID))
+	return result
+
+
+func _on_confirmed() -> void:
+	# confirm valid name
+	if terrain_name.is_empty():
+		var dialog := AcceptDialog.new()
+		dialog.dialog_text = "Name cannot be empty"
+		EditorInterface.popup_dialog_centered(dialog)
+		await dialog.visibility_changed
+		dialog.queue_free()
+		return
+	
+	accepted = true
+	hide()
+
+
+func _on_type_option_item_selected(index: int) -> void:
+	var categories_available = (index != BetterTerrain.TerrainType.CATEGORY)
+	for c in %CategoryLayout.get_children():
+		c.disabled = !categories_available

addons/better-terrain/editor/TerrainProperties.gd.uid

@@ -0,0 +1 @@
+uid://j81f0xo4p36y

addons/better-terrain/editor/TerrainProperties.tscn

@@ -0,0 +1,96 @@
+[gd_scene load_steps=5 format=3 uid="uid://fdjybw6e7whr"]
+
+[ext_resource type="Script" uid="uid://j81f0xo4p36y" path="res://addons/better-terrain/editor/TerrainProperties.gd" id="1_52nx8"]
+[ext_resource type="Texture2D" uid="uid://d1h1p7pcwdnjk" path="res://addons/better-terrain/icons/MatchTiles.svg" id="2_ncc5p"]
+[ext_resource type="Texture2D" uid="uid://dfemy1g6okwlv" path="res://addons/better-terrain/icons/MatchVertices.svg" id="3_0nvmi"]
+[ext_resource type="Texture2D" uid="uid://1yr6yruwl63u" path="res://addons/better-terrain/icons/NonModifying.svg" id="5_awp83"]
+
+[node name="TerrainProperties" type="ConfirmationDialog"]
+auto_translate_mode = 2
+oversampling_override = 1.0
+title = "Edit terrain properties"
+initial_position = 2
+size = Vector2i(317, 257)
+visible = true
+dialog_hide_on_ok = false
+script = ExtResource("1_52nx8")
+
+[node name="GridContainer" type="GridContainer" parent="."]
+offset_left = 8.0
+offset_top = 8.0
+offset_right = 309.0
+offset_bottom = 212.0
+columns = 2
+
+[node name="NameLabel" type="Label" parent="GridContainer"]
+layout_mode = 2
+text = "Name"
+
+[node name="NameEdit" type="LineEdit" parent="GridContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+placeholder_text = "Terrain name"
+
+[node name="ColorLabel" type="Label" parent="GridContainer"]
+layout_mode = 2
+text = "Color"
+
+[node name="ColorPicker" type="ColorPickerButton" parent="GridContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+color = Color(1, 0.262745, 0.498039, 1)
+edit_alpha = false
+
+[node name="IconLabel" type="Label" parent="GridContainer"]
+layout_mode = 2
+text = "Icon"
+
+[node name="IconEdit" type="LineEdit" parent="GridContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+placeholder_text = "Icon path (optional)"
+
+[node name="TypeLabel" type="Label" parent="GridContainer"]
+layout_mode = 2
+text = "Mode"
+
+[node name="TypeOption" type="OptionButton" parent="GridContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+item_count = 3
+popup/item_0/text = "Match tiles"
+popup/item_0/icon = ExtResource("2_ncc5p")
+popup/item_0/id = 0
+popup/item_1/text = "Match vertices"
+popup/item_1/icon = ExtResource("3_0nvmi")
+popup/item_1/id = 1
+popup/item_2/text = "Category"
+popup/item_2/icon = ExtResource("5_awp83")
+popup/item_2/id = 2
+
+[node name="CategoryLabel" type="Label" parent="GridContainer"]
+unique_name_in_owner = true
+visible = false
+layout_mode = 2
+size_flags_vertical = 1
+text = "Categories"
+
+[node name="CategoryContainer" type="ScrollContainer" parent="GridContainer"]
+unique_name_in_owner = true
+visible = false
+custom_minimum_size = Vector2(0, 100)
+layout_mode = 2
+size_flags_vertical = 3
+
+[node name="CategoryLayout" type="VBoxContainer" parent="GridContainer/CategoryContainer"]
+unique_name_in_owner = true
+custom_minimum_size = Vector2(0, 100)
+layout_mode = 2
+size_flags_vertical = 3
+
+[connection signal="confirmed" from="." to="." method="_on_confirmed"]
+[connection signal="item_selected" from="GridContainer/TypeOption" to="." method="_on_type_option_item_selected"]

addons/better-terrain/editor/TerrainUndo.gd

@@ -0,0 +1,190 @@
+@tool
+extends Node
+
+var action_index := 0
+var action_count := 0
+var _current_action_index := 0
+var _current_action_count := 0
+
+func create_tile_restore_point(undo_manager: EditorUndoRedoManager, tm: TileMapLayer, cells: Array, and_surrounding_cells: bool = true) -> void:
+	if and_surrounding_cells:
+		cells = BetterTerrain._widen(tm, cells)
+	
+	var restore := []
+	for c in cells:
+		restore.append([
+			c,
+			tm.get_cell_source_id(c),
+			tm.get_cell_atlas_coords(c),
+			tm.get_cell_alternative_tile(c)
+		])
+	
+	undo_manager.add_undo_method(self, &"restore_tiles", tm, restore)
+
+
+func create_tile_restore_point_area(undo_manager: EditorUndoRedoManager, tm: TileMapLayer, area: Rect2i, and_surrounding_cells: bool = true) -> void:
+	area.end += Vector2i.ONE
+	
+	var restore := []
+	for y in range(area.position.y, area.end.y):
+		for x in range(area.position.x, area.end.x):
+			var c := Vector2i(x, y)
+			restore.append([
+				c,
+				tm.get_cell_source_id(c),
+				tm.get_cell_atlas_coords(c),
+				tm.get_cell_alternative_tile(c)
+			])
+	
+	undo_manager.add_undo_method(self, &"restore_tiles", tm, restore)
+	
+	if !and_surrounding_cells:
+		return
+	
+	var edges := []
+	for x in range(area.position.x, area.end.x):
+		edges.append(Vector2i(x, area.position.y))
+		edges.append(Vector2i(x, area.end.y))
+	for y in range(area.position.y + 1, area.end.y - 1):
+		edges.append(Vector2i(area.position.x, y))
+		edges.append(Vector2i(area.end.x, y))
+	
+	edges = BetterTerrain._widen_with_exclusion(tm, edges, area)
+	create_tile_restore_point(undo_manager, tm, edges, false)
+
+
+func restore_tiles(tm: TileMapLayer, restore: Array) -> void:
+	for r in restore:
+		tm.set_cell(r[0], r[1], r[2], r[3])
+
+
+func create_peering_restore_point(undo_manager: EditorUndoRedoManager, ts: TileSet) -> void:
+	var restore := []
+	
+	for s in ts.get_source_count():
+		var source_id := ts.get_source_id(s)
+		var source := ts.get_source(source_id) as TileSetAtlasSource
+		if !source:
+			continue
+		
+		for t in source.get_tiles_count():
+			var coord := source.get_tile_id(t)
+			for a in source.get_alternative_tiles_count(coord):
+				var alternate := source.get_alternative_tile_id(coord, a)
+				
+				var td := source.get_tile_data(coord, alternate)
+				var tile_type := BetterTerrain.get_tile_terrain_type(td)
+				if tile_type == BetterTerrain.TileCategory.NON_TERRAIN:
+					continue
+				
+				var peering_dict := {}
+				for c in BetterTerrain.tile_peering_keys(td):
+					peering_dict[c] = BetterTerrain.tile_peering_types(td, c)
+				var symmetry = BetterTerrain.get_tile_symmetry_type(td)
+				restore.append([source_id, coord, alternate, tile_type, peering_dict, symmetry])
+	
+	undo_manager.add_undo_method(self, &"restore_peering", ts, restore)
+
+
+func create_peering_restore_point_specific(undo_manager: EditorUndoRedoManager, ts: TileSet, protect: int) -> void:
+	var restore := []
+	
+	for s in ts.get_source_count():
+		var source_id := ts.get_source_id(s)
+		var source := ts.get_source(source_id) as TileSetAtlasSource
+		if !source:
+			continue
+		
+		for t in source.get_tiles_count():
+			var coord := source.get_tile_id(t)
+			for a in source.get_alternative_tiles_count(coord):
+				var alternate := source.get_alternative_tile_id(coord, a)
+				
+				var td := source.get_tile_data(coord, alternate)
+				var tile_type := BetterTerrain.get_tile_terrain_type(td)
+				if tile_type == BetterTerrain.TileCategory.NON_TERRAIN:
+					continue
+				
+				var to_restore : bool = tile_type == protect
+				
+				var terrain := BetterTerrain.get_terrain(ts, tile_type)
+				var cells = BetterTerrain.data.get_terrain_peering_cells(ts, terrain.type)
+				for c in cells:
+					if protect in BetterTerrain.tile_peering_types(td, c):
+						to_restore = true
+						break
+				
+				if !to_restore:
+					continue
+				
+				var peering_dict := {}
+				for c in cells:
+					peering_dict[c] = BetterTerrain.tile_peering_types(td, c)
+				var symmetry = BetterTerrain.get_tile_symmetry_type(td)
+				restore.append([source_id, coord, alternate, tile_type, peering_dict, symmetry])
+	
+	undo_manager.add_undo_method(self, &"restore_peering", ts, restore)
+
+
+func create_peering_restore_point_tile(undo_manager: EditorUndoRedoManager, ts: TileSet, source_id: int, coord: Vector2i, alternate: int) -> void:
+	var source := ts.get_source(source_id) as TileSetAtlasSource
+	var td := source.get_tile_data(coord, alternate)
+	var tile_type := BetterTerrain.get_tile_terrain_type(td)
+	
+	var restore := []
+	var peering_dict := {}
+	for c in BetterTerrain.tile_peering_keys(td):
+		peering_dict[c] = BetterTerrain.tile_peering_types(td, c)
+	var symmetry = BetterTerrain.get_tile_symmetry_type(td)
+	restore.append([source_id, coord, alternate, tile_type, peering_dict, symmetry])
+	
+	undo_manager.add_undo_method(self, &"restore_peering", ts, restore)
+
+
+func restore_peering(ts: TileSet, restore: Array) -> void:
+	for r in restore:
+		var source := ts.get_source(r[0]) as TileSetAtlasSource
+		var td := source.get_tile_data(r[1], r[2])
+		BetterTerrain.set_tile_terrain_type(ts, td, r[3])
+		var peering_types = r[4]
+		for peering in peering_types:
+			var types := BetterTerrain.tile_peering_types(td, peering)
+			for t in types:
+				BetterTerrain.remove_tile_peering_type(ts, td, peering, t)
+			for t in peering_types[peering]:
+				BetterTerrain.add_tile_peering_type(ts, td, peering, t)
+		var symmetry = r[5]
+		BetterTerrain.set_tile_symmetry_type(ts, td, symmetry)
+
+
+func create_terrain_type_restore_point(undo_manager: EditorUndoRedoManager, ts: TileSet) -> void:
+	var count = BetterTerrain.terrain_count(ts)
+	var restore = []
+	for i in count:
+		restore.push_back(BetterTerrain.get_terrain(ts, i))
+	
+	undo_manager.add_undo_method(self, &"restore_terrain", ts, restore)
+
+
+func restore_terrain(ts: TileSet, restore: Array) -> void:
+	for i in restore.size():
+		var r = restore[i]
+		BetterTerrain.set_terrain(ts, i, r.name, r.color, r.type, r.categories, r.icon)
+
+
+func add_do_method(undo_manager: EditorUndoRedoManager, object:Object, method:StringName, args:Array):
+	if action_index > _current_action_index:
+		_current_action_index = action_index
+		_current_action_count = action_count
+	if action_count > _current_action_count:
+		_current_action_count = action_count
+	undo_manager.add_do_method(self, "_do_method", object, method, args, action_count)
+
+
+func _do_method(object:Object, method:StringName, args:Array, this_action_count:int):
+	if this_action_count >= _current_action_count:
+		object.callv(method, args)
+
+
+func finish_action():
+	_current_action_count = 0

addons/better-terrain/editor/TerrainUndo.gd.uid

@@ -0,0 +1 @@
+uid://ds1kcnrnbywo6

addons/better-terrain/editor/TileView.gd

@@ -0,0 +1,896 @@
+@tool
+extends Control
+
+signal paste_occurred
+signal change_zoom_level(value)
+signal terrain_updated(index)
+
+@onready var checkerboard := get_theme_icon("Checkerboard", "EditorIcons")
+
+@onready var paint_symmetry_icons := [
+	null,
+	preload("res://addons/better-terrain/icons/paint-symmetry/SymmetryMirror.svg"),
+	preload("res://addons/better-terrain/icons/paint-symmetry/SymmetryFlip.svg"),
+	preload("res://addons/better-terrain/icons/paint-symmetry/SymmetryReflect.svg"),
+	preload("res://addons/better-terrain/icons/paint-symmetry/SymmetryRotateClockwise.svg"),
+	preload("res://addons/better-terrain/icons/paint-symmetry/SymmetryRotateCounterClockwise.svg"),
+	preload("res://addons/better-terrain/icons/paint-symmetry/SymmetryRotate180.svg"),
+	preload("res://addons/better-terrain/icons/paint-symmetry/SymmetryRotateAll.svg"),
+	preload("res://addons/better-terrain/icons/paint-symmetry/SymmetryAll.svg"),
+]
+
+# Draw checkerboard and tiles with specific  materials in
+# individual canvas items via rendering server
+var _canvas_item_map = {}
+var _canvas_item_background : RID
+
+var tileset: TileSet
+var disabled_sources: Array[int] = []: set = set_disabled_sources
+
+var paint := BetterTerrain.TileCategory.NON_TERRAIN
+var paint_symmetry := BetterTerrain.SymmetryType.NONE
+var highlighted_tile_part := { valid = false }
+var zoom_level := 1.0
+
+var tiles_size : Vector2
+var tile_size : Vector2i
+var tile_part_size : Vector2
+var alternate_size : Vector2
+var alternate_lookup := []
+var initial_click : Vector2i
+var prev_position : Vector2i
+var current_position : Vector2i
+
+var selection_start : Vector2i
+var selection_end : Vector2i
+var selection_rect : Rect2i
+var selected_tile_states : Array[Dictionary] = []
+var copied_tile_states : Array[Dictionary] = []
+var staged_paste_tile_states : Array[Dictionary] = []
+
+var pick_icon_terrain : int = -1
+var pick_icon_terrain_cancel := false
+
+var undo_manager : EditorUndoRedoManager
+var terrain_undo
+
+# Modes for painting
+enum PaintMode {
+	NO_PAINT,
+	PAINT_TYPE,
+	PAINT_PEERING,
+	PAINT_SYMMETRY,
+	SELECT,
+	PASTE
+}
+
+var paint_mode := PaintMode.NO_PAINT
+
+# Actual interactions for painting
+enum PaintAction {
+	NO_ACTION,
+	DRAW_TYPE,
+	ERASE_TYPE,
+	DRAW_PEERING,
+	ERASE_PEERING,
+	DRAW_SYMMETRY,
+	ERASE_SYMMETRY,
+	SELECT,
+	PASTE
+}
+
+var paint_action := PaintAction.NO_ACTION
+
+const ALTERNATE_TILE_MARGIN := 18
+
+func _enter_tree() -> void:
+	_canvas_item_background = RenderingServer.canvas_item_create()
+	RenderingServer.canvas_item_set_parent(_canvas_item_background, get_canvas_item())
+	RenderingServer.canvas_item_set_draw_behind_parent(_canvas_item_background, true)
+
+
+func _exit_tree() -> void:
+	RenderingServer.free_rid(_canvas_item_background)
+	for p in _canvas_item_map:
+		RenderingServer.free_rid(_canvas_item_map[p])
+	_canvas_item_map.clear()
+
+
+func refresh_tileset(ts: TileSet) -> void:
+	tileset = ts
+	
+	tiles_size = Vector2.ZERO
+	alternate_size = Vector2.ZERO
+	alternate_lookup = []
+	disabled_sources = []
+	
+	if !tileset:
+		return
+	
+	for s in tileset.get_source_count():
+		var source_id := tileset.get_source_id(s)
+		var source := tileset.get_source(source_id) as TileSetAtlasSource
+		if !source or !source.texture:
+			continue
+		
+		tiles_size.x = max(tiles_size.x, source.texture.get_width())
+		tiles_size.y += source.texture.get_height()
+		
+		tile_size = source.texture_region_size
+		tile_part_size = Vector2(tile_size) / 3.0
+		
+		for t in source.get_tiles_count():
+			var coord := source.get_tile_id(t)
+			var alt_count := source.get_alternative_tiles_count(coord)
+			if alt_count <= 1:
+				continue
+			
+			var rect := source.get_tile_texture_region(coord, 0)
+			alternate_lookup.append([rect.size, source_id, coord])
+			alternate_size.x = max(alternate_size.x, rect.size.x * (alt_count - 1))
+			alternate_size.y += rect.size.y
+	
+	_on_zoom_value_changed(zoom_level)
+
+
+func is_tile_in_source(source: TileSetAtlasSource, coord: Vector2i) -> bool:
+	var origin := source.get_tile_at_coords(coord)
+	if origin == Vector2i(-1, -1):
+		return false
+	
+	# Animation frames are not needed
+	var size := source.get_tile_size_in_atlas(origin)
+	return coord.x < origin.x + size.x and coord.y < origin.y + size.y
+
+
+func _build_tile_part_from_position(result: Dictionary, position: Vector2i, rect: Rect2) -> void:
+	result.rect = rect
+	var type := BetterTerrain.get_tile_terrain_type(result.data)
+	if type == BetterTerrain.TileCategory.NON_TERRAIN:
+		return
+	result.terrain_type = type
+	
+	var normalize_position := (Vector2(position) - rect.position) / rect.size
+	
+	var terrain := BetterTerrain.get_terrain(tileset, type)
+	if !terrain.valid:
+		return
+	for p in BetterTerrain.data.get_terrain_peering_cells(tileset, terrain.type):
+		var side_polygon = BetterTerrain.data.peering_polygon(tileset, terrain.type, p)
+		if Geometry2D.is_point_in_polygon(normalize_position, side_polygon):
+			result.peering = p
+			result.polygon = side_polygon
+			break
+
+
+func tile_part_from_position(position: Vector2i) -> Dictionary:
+	if !tileset:
+		return { valid = false }
+	
+	var offset := Vector2.ZERO
+	var alt_offset := Vector2.RIGHT * (zoom_level * tiles_size.x + ALTERNATE_TILE_MARGIN)
+	if Rect2(alt_offset, zoom_level * alternate_size).has_point(position):
+		for a in alternate_lookup:
+			if a[1] in disabled_sources:
+				continue
+			var next_offset_y = alt_offset.y + zoom_level * a[0].y
+			if position.y > next_offset_y:
+				alt_offset.y = next_offset_y
+				continue
+			
+			var source := tileset.get_source(a[1]) as TileSetAtlasSource
+			if !source:
+				break
+			
+			var count := source.get_alternative_tiles_count(a[2])
+			var index := int((position.x - alt_offset.x) / (zoom_level * a[0].x)) + 1
+			
+			if index < count:
+				var alt_id := source.get_alternative_tile_id(a[2], index)
+				var target_rect := Rect2(
+					alt_offset + Vector2.RIGHT * (index - 1) * zoom_level * a[0].x,
+					zoom_level * a[0]
+				)
+				
+				var result := {
+					valid = true,
+					source_id = a[1],
+					coord = a[2],
+					alternate = alt_id,
+					data = source.get_tile_data(a[2], alt_id)
+				}
+				_build_tile_part_from_position(result, position, target_rect)
+				return result
+	
+	else:
+		for s in tileset.get_source_count():
+			var source_id := tileset.get_source_id(s)
+			if source_id in disabled_sources:
+				continue
+			var source := tileset.get_source(source_id) as TileSetAtlasSource
+			if !source || !source.texture:
+				continue
+			for t in source.get_tiles_count():
+				var coord := source.get_tile_id(t)
+				var rect := source.get_tile_texture_region(coord, 0)
+				var target_rect := Rect2(offset + zoom_level * rect.position, zoom_level * rect.size)
+				if !target_rect.has_point(position):
+					continue
+				
+				var result := {
+					valid = true,
+					source_id = source_id,
+					coord = coord,
+					alternate = 0,
+					data = source.get_tile_data(coord, 0)
+				}
+				_build_tile_part_from_position(result, position, target_rect)
+				return result
+			
+			offset.y += zoom_level * source.texture.get_height()
+	
+	return { valid = false }
+
+
+func tile_rect_from_position(position: Vector2i) -> Rect2:
+	if !tileset:
+		return Rect2(-1,-1,0,0)
+	
+	var offset := Vector2.ZERO
+	var alt_offset := Vector2.RIGHT * (zoom_level * tiles_size.x + ALTERNATE_TILE_MARGIN)
+	if Rect2(alt_offset, zoom_level * alternate_size).has_point(position):
+		for a in alternate_lookup:
+			if a[1] in disabled_sources:
+				continue
+			var next_offset_y = alt_offset.y + zoom_level * a[0].y
+			if position.y > next_offset_y:
+				alt_offset.y = next_offset_y
+				continue
+			
+			var source := tileset.get_source(a[1]) as TileSetAtlasSource
+			if !source:
+				break
+			
+			var count := source.get_alternative_tiles_count(a[2])
+			var index := int((position.x - alt_offset.x) / (zoom_level * a[0].x)) + 1
+			
+			if index < count:
+				var target_rect := Rect2(
+					alt_offset + Vector2.RIGHT * (index - 1) * zoom_level * a[0].x,
+					zoom_level * a[0]
+				)
+				return target_rect
+	
+	else:
+		for s in tileset.get_source_count():
+			var source_id := tileset.get_source_id(s)
+			if source_id in disabled_sources:
+				continue
+			var source := tileset.get_source(source_id) as TileSetAtlasSource
+			if !source:
+				continue
+			for t in source.get_tiles_count():
+				var coord := source.get_tile_id(t)
+				var rect := source.get_tile_texture_region(coord, 0)
+				var target_rect := Rect2(offset + zoom_level * rect.position, zoom_level * rect.size)
+				if target_rect.has_point(position):
+					return target_rect
+			
+			offset.y += zoom_level * source.texture.get_height()
+	
+	return Rect2(-1,-1,0,0)
+
+
+func tile_parts_from_rect(rect:Rect2) -> Array[Dictionary]:
+	if !tileset:
+		return []
+	
+	var tiles:Array[Dictionary] = []
+	
+	var offset := Vector2.ZERO
+	var alt_offset := Vector2.RIGHT * (zoom_level * tiles_size.x + ALTERNATE_TILE_MARGIN)
+	for s in tileset.get_source_count():
+		var source_id := tileset.get_source_id(s)
+		if source_id in disabled_sources:
+			continue
+		var source := tileset.get_source(source_id) as TileSetAtlasSource
+		if !source:
+			continue
+		for t in source.get_tiles_count():
+			var coord := source.get_tile_id(t)
+			var tile_rect := source.get_tile_texture_region(coord, 0)
+			var target_rect := Rect2(offset + zoom_level * tile_rect.position, zoom_level * tile_rect.size)
+			if target_rect.intersects(rect):
+				var result := {
+					valid = true,
+					source_id = source_id,
+					coord = coord,
+					alternate = 0,
+					data = source.get_tile_data(coord, 0)
+				}
+				var pos = target_rect.position + target_rect.size/2
+				_build_tile_part_from_position(result, pos, target_rect)
+				tiles.push_back(result)
+			var alt_count := source.get_alternative_tiles_count(coord)
+			for a in alt_count:
+				var alt_id := 0
+				if a == 0:
+					continue
+				
+				target_rect = Rect2(alt_offset + zoom_level * (a - 1) * tile_rect.size.x * Vector2.RIGHT, zoom_level * tile_rect.size)
+				alt_id = source.get_alternative_tile_id(coord, a)
+				if target_rect.intersects(rect):
+					var td := source.get_tile_data(coord, alt_id)
+					var result := {
+						valid = true,
+						source_id = source_id,
+						coord = coord,
+						alternate = alt_id,
+						data = td
+					}
+					var pos = target_rect.position + target_rect.size/2
+					_build_tile_part_from_position(result, pos, target_rect)
+					tiles.push_back(result)
+			if alt_count > 1:
+				alt_offset.y += zoom_level * tile_rect.size.y
+		
+		offset.y += zoom_level * source.texture.get_height()
+	
+	return tiles
+
+
+func _get_canvas_item(td: TileData) -> RID:
+	if !td.material:
+		return self.get_canvas_item()
+	if _canvas_item_map.has(td.material):
+		return _canvas_item_map[td.material]
+	
+	var rid = RenderingServer.canvas_item_create()
+	RenderingServer.canvas_item_set_material(rid, td.material.get_rid())
+	RenderingServer.canvas_item_set_parent(rid, get_canvas_item())
+	RenderingServer.canvas_item_set_draw_behind_parent(rid, true)
+	RenderingServer.canvas_item_set_default_texture_filter(rid, RenderingServer.CANVAS_ITEM_TEXTURE_FILTER_NEAREST)
+	_canvas_item_map[td.material] = rid
+	return rid
+
+
+func _draw_tile_data(texture: Texture2D, rect: Rect2, src_rect: Rect2, td: TileData, draw_sides: bool = true) -> void:
+	var flipped_rect := rect
+	if td.flip_h:
+		flipped_rect.size.x = -rect.size.x
+	if td.flip_v:
+		flipped_rect.size.y = -rect.size.y
+	
+	RenderingServer.canvas_item_add_texture_rect_region(
+		_get_canvas_item(td),
+		flipped_rect,
+		texture.get_rid(),
+		src_rect,
+		td.modulate,
+		td.transpose
+	)
+	
+	var type := BetterTerrain.get_tile_terrain_type(td)
+	if type == BetterTerrain.TileCategory.NON_TERRAIN:
+		draw_rect(rect, Color(0.1, 0.1, 0.1, 0.5), true)
+		return
+	
+	var terrain := BetterTerrain.get_terrain(tileset, type)
+	if !terrain.valid:
+		return
+	
+	var transform := Transform2D(0.0, rect.size, 0.0, rect.position)
+	var center_polygon = transform * BetterTerrain.data.peering_polygon(tileset, terrain.type, -1)
+	draw_colored_polygon(center_polygon, Color(terrain.color, 0.6))
+	if terrain.type == BetterTerrain.TerrainType.DECORATION:
+		center_polygon.append(center_polygon[0])
+		draw_polyline(center_polygon, Color.BLACK)
+	
+	if paint < BetterTerrain.TileCategory.EMPTY or paint >= BetterTerrain.terrain_count(tileset):
+		return
+	
+	if not draw_sides:
+		return
+	
+	var paint_terrain := BetterTerrain.get_terrain(tileset, paint)
+	for p in BetterTerrain.data.get_terrain_peering_cells(tileset, terrain.type):
+		if paint in BetterTerrain.tile_peering_types(td, p):
+			var side_polygon = transform * BetterTerrain.data.peering_polygon(tileset, terrain.type, p)
+			draw_colored_polygon(side_polygon, Color(paint_terrain.color, 0.6))
+			if paint_terrain.type == BetterTerrain.TerrainType.DECORATION:
+				side_polygon.append(side_polygon[0])
+				draw_polyline(side_polygon, Color.BLACK)
+
+
+func _draw_tile_symmetry(texture: Texture2D, rect: Rect2, src_rect: Rect2, td: TileData, draw_icon: bool = true) -> void:
+	var flipped_rect := rect
+	if td.flip_h:
+		flipped_rect.size.x = -rect.size.x
+	if td.flip_v:
+		flipped_rect.size.y = -rect.size.y
+	
+	RenderingServer.canvas_item_add_texture_rect_region(
+		_get_canvas_item(td),
+		flipped_rect,
+		texture.get_rid(),
+		src_rect,
+		td.modulate,
+		td.transpose
+	)
+	
+	if not draw_icon:
+		return
+	
+	var symmetry_type = BetterTerrain.get_tile_symmetry_type(td)
+	if symmetry_type == 0:
+		return
+	var symmetry_icon = paint_symmetry_icons[symmetry_type]
+	
+	RenderingServer.canvas_item_add_texture_rect_region(
+		_get_canvas_item(td),
+		rect,
+		symmetry_icon.get_rid(),
+		Rect2(Vector2.ZERO, symmetry_icon.get_size()),
+		Color(1,1,1,0.5)
+	)
+
+
+func _draw() -> void:
+	if !tileset:
+		return
+	
+	# Clear material-based render targets
+	RenderingServer.canvas_item_clear(_canvas_item_background)
+	for p in _canvas_item_map:
+		RenderingServer.canvas_item_clear(_canvas_item_map[p])
+	
+	var offset := Vector2.ZERO
+	var alt_offset := Vector2.RIGHT * (zoom_level * tiles_size.x + ALTERNATE_TILE_MARGIN)
+	
+	RenderingServer.canvas_item_add_texture_rect(
+		_canvas_item_background,
+		Rect2(alt_offset, zoom_level * alternate_size),
+		checkerboard.get_rid(),
+		true
+	)
+	
+	for s in tileset.get_source_count():
+		var source_id := tileset.get_source_id(s)
+		if source_id in disabled_sources:
+			continue
+		var source := tileset.get_source(source_id) as TileSetAtlasSource
+		if !source or !source.texture:
+			continue
+		
+		RenderingServer.canvas_item_add_texture_rect(
+			_canvas_item_background,
+			Rect2(offset, zoom_level * source.texture.get_size()),
+			checkerboard.get_rid(),
+			true
+		)
+		for t in source.get_tiles_count():
+			var coord := source.get_tile_id(t)
+			var rect := source.get_tile_texture_region(coord, 0)
+			var alt_count := source.get_alternative_tiles_count(coord)
+			var target_rect : Rect2
+			for a in alt_count:
+				var alt_id := 0
+				if a == 0:
+					target_rect = Rect2(offset + zoom_level * rect.position, zoom_level * rect.size)
+				else:
+					target_rect = Rect2(alt_offset + zoom_level * (a - 1) * rect.size.x * Vector2.RIGHT, zoom_level * rect.size)
+					alt_id = source.get_alternative_tile_id(coord, a)
+				
+				var td := source.get_tile_data(coord, alt_id)
+				var drawing_current = BetterTerrain.get_tile_terrain_type(td) == paint
+				if paint_mode == PaintMode.PAINT_SYMMETRY:
+					_draw_tile_symmetry(source.texture, target_rect, rect, td, drawing_current)
+				else:
+					_draw_tile_data(source.texture, target_rect, rect, td)
+				
+				if drawing_current:
+					draw_rect(target_rect.grow(-1), Color(0,0,0, 0.75), false, 1)
+					draw_rect(target_rect, Color(1,1,1, 0.75), false, 1)
+				
+				if paint_mode == PaintMode.SELECT:
+					if selected_tile_states.any(func(v):
+						return v.part.data == td
+						):
+						draw_rect(target_rect.grow(-1), Color.DEEP_SKY_BLUE, false, 2)
+			
+			if alt_count > 1:
+				alt_offset.y += zoom_level * rect.size.y
+		
+		# Blank out unused or uninteresting tiles
+		var size := source.get_atlas_grid_size()
+		for y in size.y:
+			for x in size.x:
+				var pos := Vector2i(x, y)
+				if !is_tile_in_source(source, pos):
+					var atlas_pos := source.margins + pos * (source.separation + source.texture_region_size)
+					draw_rect(Rect2(offset + zoom_level * atlas_pos, zoom_level * source.texture_region_size), Color(0.0, 0.0, 0.0, 0.8), true)
+		
+		offset.y += zoom_level * source.texture.get_height()
+	
+	# Blank out unused alternate tile sections
+	alt_offset = Vector2.RIGHT * (zoom_level * tiles_size.x + ALTERNATE_TILE_MARGIN)
+	for a in alternate_lookup:
+		if a[1] in disabled_sources:
+			continue
+		var source := tileset.get_source(a[1]) as TileSetAtlasSource
+		if source:
+			var count := source.get_alternative_tiles_count(a[2]) - 1
+			var occupied_width = count * zoom_level * a[0].x
+			var area := Rect2(
+				alt_offset.x + occupied_width,
+				alt_offset.y,
+				zoom_level * alternate_size.x - occupied_width,
+				zoom_level * a[0].y
+			)
+			draw_rect(area, Color(0.0, 0.0, 0.0, 0.8), true)
+		alt_offset.y += zoom_level * a[0].y
+	
+	if highlighted_tile_part.valid:
+		if paint_mode == PaintMode.PAINT_PEERING and highlighted_tile_part.has("polygon"):
+			var transform := Transform2D(0.0, highlighted_tile_part.rect.size - 2 * Vector2.ONE, 0.0, highlighted_tile_part.rect.position + Vector2.ONE)
+			draw_colored_polygon(transform * highlighted_tile_part.polygon, Color(Color.WHITE, 0.2))
+		if paint_mode != PaintMode.NO_PAINT:
+			var inner_rect := Rect2(highlighted_tile_part.rect.position + Vector2.ONE, highlighted_tile_part.rect.size - 2 * Vector2.ONE) 
+			draw_rect(inner_rect, Color.WHITE, false)
+		if paint_mode == PaintMode.PAINT_SYMMETRY:
+			if paint_symmetry > 0:
+				var symmetry_icon = paint_symmetry_icons[paint_symmetry]
+				draw_texture_rect(symmetry_icon, highlighted_tile_part.rect, false, Color(0.5,0.75,1,0.5))
+	
+	if paint_mode == PaintMode.SELECT:
+		draw_rect(selection_rect, Color.WHITE, false)
+	
+	if paint_mode == PaintMode.PASTE:
+		if staged_paste_tile_states.size() > 0:
+			var base_rect = staged_paste_tile_states[0].base_rect
+			var paint_terrain := BetterTerrain.get_terrain(tileset, paint)
+			var paint_terrain_type = paint_terrain.type
+			if paint_terrain_type == BetterTerrain.TerrainType.CATEGORY:
+				paint_terrain_type = 0
+			for state in staged_paste_tile_states:
+				var staged_rect:Rect2 = state.base_rect
+				staged_rect.position -= base_rect.position + base_rect.size / 2
+				
+				staged_rect.position *= zoom_level
+				staged_rect.size *= zoom_level
+				
+				staged_rect.position += Vector2(current_position)
+				
+				var real_rect = tile_rect_from_position(staged_rect.get_center())
+				if real_rect.position.x >= 0:
+					draw_rect(real_rect, Color(0,0,0, 0.3), true)
+					var transform := Transform2D(0.0, real_rect.size, 0.0, real_rect.position)
+					var tile_sides = BetterTerrain.data.get_terrain_peering_cells(tileset, paint_terrain_type)
+					for p in tile_sides:
+						if state.paint in BetterTerrain.tile_peering_types(state.part.data, p):
+							var side_polygon = BetterTerrain.data.peering_polygon(tileset, paint_terrain_type, p)
+							var color = Color(paint_terrain.color, 0.6)
+							draw_colored_polygon(transform * side_polygon, color)
+				
+				draw_rect(staged_rect, Color.DEEP_PINK, false)
+	
+
+
+func delete_selection():
+	undo_manager.create_action("Delete tile terrain peering types", UndoRedo.MERGE_DISABLE, tileset)
+	for t in selected_tile_states:
+		for side in range(16):
+			var old_peering = BetterTerrain.tile_peering_types(t.part.data, side)
+			if old_peering.has(paint):
+				undo_manager.add_do_method(BetterTerrain, &"remove_tile_peering_type", tileset, t.part.data, side, paint)
+				undo_manager.add_undo_method(BetterTerrain, &"add_tile_peering_type", tileset, t.part.data, side, paint)
+	
+	undo_manager.add_do_method(self, &"queue_redraw")
+	undo_manager.add_undo_method(self, &"queue_redraw")
+	undo_manager.commit_action()
+
+
+func toggle_selection():
+	undo_manager.create_action("Toggle tile terrain", UndoRedo.MERGE_DISABLE, tileset, true)
+	for t in selected_tile_states:
+		var type := BetterTerrain.get_tile_terrain_type(t.part.data)
+		var goal := paint if paint != type else BetterTerrain.TileCategory.NON_TERRAIN
+		
+		terrain_undo.add_do_method(undo_manager, BetterTerrain, &"set_tile_terrain_type", [tileset, t.part.data, goal])
+		if goal == BetterTerrain.TileCategory.NON_TERRAIN:
+			terrain_undo.create_peering_restore_point_tile(
+				undo_manager,
+				tileset,
+				t.part.source_id,
+				t.part.coord,
+				t.part.alternate
+			)
+		else:
+			undo_manager.add_undo_method(BetterTerrain, &"set_tile_terrain_type", tileset, t.part.data, type)
+	
+	terrain_undo.add_do_method(undo_manager, self, &"queue_redraw", [])
+	undo_manager.add_undo_method(self, &"queue_redraw")
+	undo_manager.commit_action()
+	terrain_undo.action_count += 1
+
+
+func copy_selection():
+	copied_tile_states = selected_tile_states
+
+
+func paste_selection():
+	staged_paste_tile_states = copied_tile_states
+	selected_tile_states = []
+	paint_mode = PaintMode.PASTE
+	paint_action = PaintAction.PASTE
+	paste_occurred.emit()
+	queue_redraw()
+
+
+func set_disabled_sources(list):
+	disabled_sources = list
+	queue_redraw()
+
+
+func emit_terrain_updated(index):
+	terrain_updated.emit(index)
+
+
+func _gui_input(event) -> void:
+	if event is InputEventKey and event.is_pressed():
+		if event.keycode == KEY_DELETE and not event.echo:
+			accept_event()
+			delete_selection()
+		if event.keycode == KEY_ENTER and not event.echo:
+			accept_event()
+			toggle_selection()
+		if event.keycode == KEY_ESCAPE and not event.echo:
+			accept_event()
+			if paint_action == PaintAction.PASTE:
+				staged_paste_tile_states = []
+				paint_mode = PaintMode.SELECT
+				paint_action = PaintAction.NO_ACTION
+				selection_start = Vector2i(-1,-1)
+		if event.keycode == KEY_C and (event.ctrl_pressed or event.meta_pressed) and not event.echo:
+			accept_event()
+			copy_selection()
+		if event.keycode == KEY_X and (event.ctrl_pressed or event.meta_pressed) and not event.echo:
+			accept_event()
+			copy_selection()
+			delete_selection()
+		if event.keycode == KEY_V and (event.ctrl_pressed or event.meta_pressed) and not event.echo:
+			accept_event()
+			paste_selection()
+	if event is InputEventMouseButton:
+		if event.button_index == MOUSE_BUTTON_WHEEL_UP and (event.ctrl_pressed or event.meta_pressed):
+			accept_event()
+			change_zoom_level.emit(zoom_level * 1.1)
+		if event.button_index == MOUSE_BUTTON_WHEEL_DOWN and (event.ctrl_pressed or event.meta_pressed):
+			accept_event()
+			change_zoom_level.emit(zoom_level / 1.1)
+	
+	var released : bool = event is InputEventMouseButton and (not event.pressed and (event.button_index == MOUSE_BUTTON_LEFT or event.button_index == MOUSE_BUTTON_RIGHT))
+	if released:
+		paint_action = PaintAction.NO_ACTION
+	
+	if event is InputEventMouseMotion:
+		prev_position = current_position
+		current_position = event.position
+		var tile := tile_part_from_position(event.position)
+		if tile.valid != highlighted_tile_part.valid or\
+			(tile.valid and tile.data != highlighted_tile_part.data) or\
+			(tile.valid and tile.get("peering") != highlighted_tile_part.get("peering")) or\
+			event.button_mask & MOUSE_BUTTON_LEFT and paint_action == PaintAction.SELECT:
+			queue_redraw()
+		highlighted_tile_part = tile
+	
+	var clicked : bool = event is InputEventMouseButton and (event.pressed and (event.button_index == MOUSE_BUTTON_LEFT or event.button_index == MOUSE_BUTTON_RIGHT))
+	if clicked:
+		initial_click = current_position
+		selection_start = Vector2i(-1,-1)
+		terrain_undo.action_index += 1
+		terrain_undo.action_count = 0
+	if released:
+		terrain_undo.finish_action()
+		selection_rect = Rect2i(0,0,0,0)
+		queue_redraw()
+	
+	if paint_action == PaintAction.PASTE:
+		if event is InputEventMouseMotion:
+			queue_redraw()
+		
+		if clicked:
+			if event.button_index == MOUSE_BUTTON_LEFT and staged_paste_tile_states.size() > 0:
+				undo_manager.create_action("Paste tile terrain peering types", UndoRedo.MERGE_DISABLE, tileset)
+				var base_rect = staged_paste_tile_states[0].base_rect
+				for p in staged_paste_tile_states:
+					var staged_rect:Rect2 = p.base_rect
+					staged_rect.position -= base_rect.position + base_rect.size / 2
+					
+					staged_rect.position *= zoom_level
+					staged_rect.size *= zoom_level
+					
+					staged_rect.position += Vector2(current_position)
+					
+					var old_tile_part = tile_part_from_position(staged_rect.get_center())
+					var new_tile_state = p
+					if (not old_tile_part.valid) or (not new_tile_state.part.valid):
+						continue
+					
+					for side in range(16):
+						var old_peering = BetterTerrain.tile_peering_types(old_tile_part.data, side)
+						var new_sides = new_tile_state.sides
+						if new_sides.has(side) and not old_peering.has(paint):
+							undo_manager.add_do_method(BetterTerrain, &"add_tile_peering_type", tileset, old_tile_part.data, side, paint)
+							undo_manager.add_undo_method(BetterTerrain, &"remove_tile_peering_type", tileset, old_tile_part.data, side, paint)
+						elif old_peering.has(paint) and not new_sides.has(side):
+							undo_manager.add_do_method(BetterTerrain, &"remove_tile_peering_type", tileset, old_tile_part.data, side, paint)
+							undo_manager.add_undo_method(BetterTerrain, &"add_tile_peering_type", tileset, old_tile_part.data, side, paint)
+					
+					var old_symmetry = BetterTerrain.get_tile_symmetry_type(old_tile_part.data)
+					var new_symmetry = new_tile_state.symmetry
+					if new_symmetry != old_symmetry:
+						undo_manager.add_do_method(BetterTerrain, &"set_tile_symmetry_type", tileset, old_tile_part.data, new_symmetry)
+						undo_manager.add_undo_method(BetterTerrain, &"set_tile_symmetry_type", tileset, old_tile_part.data, old_symmetry)
+					
+				undo_manager.add_do_method(self, &"queue_redraw")
+				undo_manager.add_undo_method(self, &"queue_redraw")
+				undo_manager.commit_action()
+			
+			staged_paste_tile_states = []
+			paint_mode = PaintMode.SELECT
+			paint_action = PaintAction.SELECT
+		return
+	
+	if clicked and pick_icon_terrain >= 0:
+		highlighted_tile_part = tile_part_from_position(current_position)
+		if !highlighted_tile_part.valid:
+			return
+		
+		var t = BetterTerrain.get_terrain(tileset, paint)
+		var prev_icon = t.icon.duplicate()
+		var icon = {
+			source_id = highlighted_tile_part.source_id,
+			coord = highlighted_tile_part.coord
+		}
+		undo_manager.create_action("Edit terrain details", UndoRedo.MERGE_DISABLE, tileset)
+		undo_manager.add_do_method(BetterTerrain, &"set_terrain", tileset, paint, t.name, t.color, t.type, t.categories, icon)
+		undo_manager.add_do_method(self, &"emit_terrain_updated", paint)
+		undo_manager.add_undo_method(BetterTerrain, &"set_terrain", tileset, paint, t.name, t.color, t.type, t.categories, prev_icon)
+		undo_manager.add_undo_method(self, &"emit_terrain_updated", paint)
+		undo_manager.commit_action()
+		pick_icon_terrain = -1
+		return
+	
+	if pick_icon_terrain_cancel:
+		pick_icon_terrain = -1
+		pick_icon_terrain_cancel = false
+	
+	if paint != BetterTerrain.TileCategory.NON_TERRAIN and clicked:
+		paint_action = PaintAction.NO_ACTION
+		if highlighted_tile_part.valid:
+			match [paint_mode, event.button_index]:
+				[PaintMode.PAINT_TYPE, MOUSE_BUTTON_LEFT]: paint_action = PaintAction.DRAW_TYPE
+				[PaintMode.PAINT_TYPE, MOUSE_BUTTON_RIGHT]: paint_action = PaintAction.ERASE_TYPE
+				[PaintMode.PAINT_PEERING, MOUSE_BUTTON_LEFT]: paint_action = PaintAction.DRAW_PEERING
+				[PaintMode.PAINT_PEERING, MOUSE_BUTTON_RIGHT]: paint_action = PaintAction.ERASE_PEERING
+				[PaintMode.PAINT_SYMMETRY, MOUSE_BUTTON_LEFT]: paint_action = PaintAction.DRAW_SYMMETRY
+				[PaintMode.PAINT_SYMMETRY, MOUSE_BUTTON_RIGHT]: paint_action = PaintAction.ERASE_SYMMETRY
+				[PaintMode.SELECT, MOUSE_BUTTON_LEFT]: paint_action = PaintAction.SELECT
+		else:
+			match [paint_mode, event.button_index]:
+				[PaintMode.SELECT, MOUSE_BUTTON_LEFT]: paint_action = PaintAction.SELECT
+	
+	if (clicked or event is InputEventMouseMotion) and paint_action != PaintAction.NO_ACTION:
+		
+		if paint_action == PaintAction.SELECT:
+			if clicked:
+				selection_start = Vector2i(-1,-1)
+				queue_redraw()
+			if selection_start.x < 0:
+				selection_start = current_position
+			selection_end = current_position
+			
+			selection_rect = Rect2i(selection_start, selection_end - selection_start).abs()
+			var selected_tile_parts = tile_parts_from_rect(selection_rect)
+			selected_tile_states = []
+			for t in selected_tile_parts:
+				var state := {
+					part = t,
+					base_rect = Rect2(t.rect.position / zoom_level, t.rect.size / zoom_level),
+					paint = paint,
+					sides = BetterTerrain.tile_peering_for_type(t.data, paint),
+					symmetry = BetterTerrain.get_tile_symmetry_type(t.data)
+				}
+				selected_tile_states.push_back(state)
+		else:
+			if !highlighted_tile_part.valid:
+				return
+			#slightly crude and non-optimal but way simpler than the "correct" solution
+			var current_position_vec2 = Vector2(current_position)
+			var prev_position_vec2 = Vector2(prev_position)
+			var mouse_dist = current_position_vec2.distance_to(prev_position_vec2)
+			var step_size = (tile_part_size.x * zoom_level)
+			var steps = ceil(mouse_dist / step_size) + 1
+			for i in range(steps):
+				var t = float(i) / steps 
+				var check_position = prev_position_vec2.lerp(current_position_vec2, t)
+				highlighted_tile_part = tile_part_from_position(check_position)
+			
+				if !highlighted_tile_part.valid:
+					continue
+				
+				if paint_action == PaintAction.DRAW_TYPE or paint_action == PaintAction.ERASE_TYPE:
+					var type := BetterTerrain.get_tile_terrain_type(highlighted_tile_part.data)
+					var goal := paint if paint_action == PaintAction.DRAW_TYPE else BetterTerrain.TileCategory.NON_TERRAIN
+					if type != goal:
+						undo_manager.create_action("Set tile terrain type " + str(terrain_undo.action_index), UndoRedo.MERGE_ALL, tileset, true)
+						terrain_undo.add_do_method(undo_manager, BetterTerrain, &"set_tile_terrain_type", [tileset, highlighted_tile_part.data, goal])
+						terrain_undo.add_do_method(undo_manager, self, &"queue_redraw", [])
+						if goal == BetterTerrain.TileCategory.NON_TERRAIN:
+							terrain_undo.create_peering_restore_point_tile(
+								undo_manager,
+								tileset,
+								highlighted_tile_part.source_id,
+								highlighted_tile_part.coord,
+								highlighted_tile_part.alternate
+							)
+						else:
+							undo_manager.add_undo_method(BetterTerrain, &"set_tile_terrain_type", tileset, highlighted_tile_part.data, type)
+						undo_manager.add_undo_method(self, &"queue_redraw")
+						undo_manager.commit_action()
+						terrain_undo.action_count += 1
+				elif paint_action == PaintAction.DRAW_PEERING:
+					if highlighted_tile_part.has("peering"):
+						if !(paint in BetterTerrain.tile_peering_types(highlighted_tile_part.data, highlighted_tile_part.peering)):
+							undo_manager.create_action("Set tile terrain peering type " + str(terrain_undo.action_index), UndoRedo.MERGE_ALL, tileset, true)
+							terrain_undo.add_do_method(undo_manager, BetterTerrain, &"add_tile_peering_type", [tileset, highlighted_tile_part.data, highlighted_tile_part.peering, paint])
+							terrain_undo.add_do_method(undo_manager, self, &"queue_redraw", [])
+							undo_manager.add_undo_method(BetterTerrain, &"remove_tile_peering_type", tileset, highlighted_tile_part.data, highlighted_tile_part.peering, paint)
+							undo_manager.add_undo_method(self, &"queue_redraw")
+							undo_manager.commit_action()
+							terrain_undo.action_count += 1
+				elif paint_action == PaintAction.ERASE_PEERING:
+					if highlighted_tile_part.has("peering"):
+						if paint in BetterTerrain.tile_peering_types(highlighted_tile_part.data, highlighted_tile_part.peering):
+							undo_manager.create_action("Remove tile terrain peering type " + str(terrain_undo.action_index), UndoRedo.MERGE_ALL, tileset, true)
+							terrain_undo.add_do_method(undo_manager, BetterTerrain, &"remove_tile_peering_type", [tileset, highlighted_tile_part.data, highlighted_tile_part.peering, paint])
+							terrain_undo.add_do_method(undo_manager, self, &"queue_redraw", [])
+							undo_manager.add_undo_method(BetterTerrain, &"add_tile_peering_type", tileset, highlighted_tile_part.data, highlighted_tile_part.peering, paint)
+							undo_manager.add_undo_method(self, &"queue_redraw")
+							undo_manager.commit_action()
+							terrain_undo.action_count += 1
+				elif paint_action == PaintAction.DRAW_SYMMETRY:
+					if paint == BetterTerrain.get_tile_terrain_type(highlighted_tile_part.data):
+						undo_manager.create_action("Set tile symmetry type " + str(terrain_undo.action_index), UndoRedo.MERGE_ALL, tileset, true)
+						var old_symmetry = BetterTerrain.get_tile_symmetry_type(highlighted_tile_part.data)
+						terrain_undo.add_do_method(undo_manager, BetterTerrain, &"set_tile_symmetry_type", [tileset, highlighted_tile_part.data, paint_symmetry])
+						terrain_undo.add_do_method(undo_manager, self, &"queue_redraw", [])
+						undo_manager.add_undo_method(BetterTerrain, &"set_tile_symmetry_type", tileset, highlighted_tile_part.data, old_symmetry)
+						undo_manager.add_undo_method(self, &"queue_redraw")
+						undo_manager.commit_action()
+						terrain_undo.action_count += 1
+				elif paint_action == PaintAction.ERASE_SYMMETRY:
+					if paint == BetterTerrain.get_tile_terrain_type(highlighted_tile_part.data):
+						undo_manager.create_action("Remove tile symmetry type " + str(terrain_undo.action_index), UndoRedo.MERGE_ALL, tileset, true)
+						var old_symmetry = BetterTerrain.get_tile_symmetry_type(highlighted_tile_part.data)
+						terrain_undo.add_do_method(undo_manager, BetterTerrain, &"set_tile_symmetry_type", [tileset, highlighted_tile_part.data, BetterTerrain.SymmetryType.NONE])
+						terrain_undo.add_do_method(undo_manager, self, &"queue_redraw", [])
+						undo_manager.add_undo_method(BetterTerrain, &"set_tile_symmetry_type", tileset, highlighted_tile_part.data, old_symmetry)
+						undo_manager.add_undo_method(self, &"queue_redraw")
+						undo_manager.commit_action()
+						terrain_undo.action_count += 1
+
+
+func _on_zoom_value_changed(value) -> void:
+	zoom_level = value
+	custom_minimum_size.x = zoom_level * tiles_size.x
+	if alternate_size.x > 0:
+		custom_minimum_size.x += ALTERNATE_TILE_MARGIN + zoom_level * alternate_size.x
+	custom_minimum_size.y = zoom_level * max(tiles_size.y, alternate_size.y)
+	queue_redraw()
+
+
+func clear_highlighted_tile() -> void:
+	highlighted_tile_part = { valid = false }
+	queue_redraw()

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