Rename up/down to raise/lower

addons/terrain-editing/terrain_editing_plugin.gd

@@ -20,6 +20,7 @@ func _make_visible(visible: bool) -> void:
 		if not controls:
 			var controls_scene = load("res://terrain/editing/TerrainEditingControls.tscn")
 			controls = controls_scene.instantiate()
+			controls.EditorUndoRedo = get_undo_redo()
 		add_control_to_container(CONTAINER, controls)
 	elif controls and controls.get_parent():
 		remove_control_from_container(CONTAINER, controls)

assets/textures/terrain/editing/height_lower.png.import

@@ -3,15 +3,15 @@
 importer="texture"
 type="CompressedTexture2D"
 uid="uid://covyafauwthij"
-path="res://.godot/imported/height_down.png-47ae6eeb5feb0ddf7bd952befb4351fe.ctex"
+path="res://.godot/imported/height_lower.png-d00d3c7062c0a355f5c8381ee7e664da.ctex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://assets/textures/terrain/editing/height_down.png"
-dest_files=["res://.godot/imported/height_down.png-47ae6eeb5feb0ddf7bd952befb4351fe.ctex"]
+source_file="res://assets/textures/terrain/editing/height_lower.png"
+dest_files=["res://.godot/imported/height_lower.png-d00d3c7062c0a355f5c8381ee7e664da.ctex"]
 
 [params]
 

assets/textures/terrain/editing/height_raise.png.import

@@ -3,15 +3,15 @@
 importer="texture"
 type="CompressedTexture2D"
 uid="uid://dxbfohim13ti1"
-path="res://.godot/imported/height_up.png-d84180c0cff17a8285e5e5cb8f54e819.ctex"
+path="res://.godot/imported/height_raise.png-a5718ceb2e90ce17597f6300a0a9a715.ctex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://assets/textures/terrain/editing/height_up.png"
-dest_files=["res://.godot/imported/height_up.png-d84180c0cff17a8285e5e5cb8f54e819.ctex"]
+source_file="res://assets/textures/terrain/editing/height_raise.png"
+dest_files=["res://.godot/imported/height_raise.png-a5718ceb2e90ce17597f6300a0a9a715.ctex"]
 
 [params]
 

terrain/Tile.cs

@@ -90,6 +90,9 @@ public struct Corners<T>(T topLeft, T topRight, T bottomRight, T bottomLeft)
 	public T BottomRight = bottomRight;
 	public T BottomLeft  = bottomLeft;
 
+	public Corners(T value)
+		: this(value, value, value, value) {  }
+
 	public T this[Corner corner] {
 		readonly get => corner switch {
 			Corner.TopLeft     => TopLeft,

terrain/editing/TerrainEditingControls+Editing.cs

@@ -1,5 +1,10 @@
+using System.IO;
+
 public partial class TerrainEditingControls
 {
+	// Set by the terrain editing plugin.
+	public EditorUndoRedoManager EditorUndoRedo { get; set; }
+
 	Terrain _currentTerrain = null;
 
 	Material _editToolMaterial;
@@ -76,7 +81,6 @@ public partial class TerrainEditingControls
 
 				// TODO: Handle different tool modes, such as flatten and painting.
 				// TODO: Allow click-dragging which doesn't affect already changed tiles / corners.
-				// TODO: Support undo and redo.
 				// TODO: Make mesh generation generate vertical walls between disconnected corners.
 				// TODO: Use ArrayMesh instead of ImmediateMesh.
 
@@ -84,13 +88,16 @@ public partial class TerrainEditingControls
 				if (mouse is InputEventMouseButton { ButtonIndex: MouseButton.Left, Pressed: true }) {
 					GetViewport().SetInputAsHandled();
 
-					const float AdjustHeight = 0.5f;
-					var amount = UpDownToggle.ButtonPressed ? AdjustHeight : -AdjustHeight;
+					var cornersToChange = new HashSet<(TilePos Position, Corner Corner)>();
+
+					// Raise selected tiles themselves.
+					foreach (var pos in tiles)
+						foreach (var corner2 in Enum.GetValues<Corner>())
+							cornersToChange.Add((pos, corner2));
 
 					// If the Connected toggle button is active, move "connected" corners.
 					// Connected corners are the ones that are at the same height as ones already being moved.
 					if (ConnectedToggle.ButtonPressed) {
-						var corners = new HashSet<(TilePos Position, Corner Corner)>();
 						foreach (var pos in tiles) {
 							var tile2 = terrain.GetTile(pos);
 							foreach (var corner2 in Enum.GetValues<Corner>()) {
@@ -98,30 +105,48 @@ public partial class TerrainEditingControls
 								foreach (var (neighborPos, neighborCorner) in GetNeighbors(pos, corner2)) {
 									if (tiles.Contains(neighborPos)) continue;
 									var neighborHeight = terrain.GetTile(neighborPos).Height[neighborCorner];
-									if (neighborHeight == height) corners.Add((neighborPos, neighborCorner));
+									if (neighborHeight == height) cornersToChange.Add((neighborPos, neighborCorner));
+								}
 							}
 						}
 					}
 
-						// Raise connected corners.
-						foreach (var group in corners.GroupBy(e => e.Position, e => e.Corner)) {
+					var isFlatten = ToolMode == ToolMode.Flatten;
+					var isRaise   = RaiseLowerToggle.ButtonPressed;
+
+					const float AdjustHeight = 0.5f;
+					var amount = isFlatten ? terrain.GetTile(tile).Height[corner]
+					           : isRaise   ? AdjustHeight : -AdjustHeight;
+
+					var tilesPrevious = new List<(TilePos, Corners<float>)>();
+					var tilesChanged  = new List<(TilePos, Corners<float>)>();
+					foreach (var group in cornersToChange.GroupBy(c => c.Position, c => c.Corner)) {
 						var pos = group.Key;
 						var tile2 = terrain.GetTile(pos);
-							foreach (var corner2 in group)
-								tile2.Height[corner2] += amount;
-							terrain.SetTile(pos, tile2);
+						tilesPrevious.Add((pos, tile2.Height));
+
+						var newHeight = tile2.Height;
+						foreach (var corner2 in group) {
+							if (isFlatten) newHeight[corner2]  = amount;
+							else           newHeight[corner2] += amount;
 						}
+						tilesChanged.Add((pos, newHeight));
 					}
 
-					// Raise selected tiles themselves.
-					foreach (var pos in tiles) {
-						var tile2 = terrain.GetTile(pos);
-						tile2.Height.Adjust(amount);
-						terrain.SetTile(pos, tile2);
-					}
+					if (EditorUndoRedo is EditorUndoRedoManager undo) {
+						var name = "Modify terrain"; // TODO: Change name depending on tool mode.
+						undo.CreateAction(name, customContext: terrain, backwardUndoOps: false);
 
-					terrain.UpdateMeshAndShape();
-					terrain.NotifyPropertyListChanged();
+						undo.AddDoMethod(this, nameof(TerrainModifyHeight), terrain, Pack(tilesChanged));
+						undo.AddDoMethod(terrain, GodotObject.MethodName.NotifyPropertyListChanged);
+						undo.AddDoMethod(terrain, nameof(Terrain.UpdateMeshAndShape));
+
+						undo.AddUndoMethod(this, nameof(TerrainModifyHeight), terrain, Pack(tilesPrevious));
+						undo.AddUndoMethod(terrain, GodotObject.MethodName.NotifyPropertyListChanged);
+						undo.AddUndoMethod(terrain, nameof(Terrain.UpdateMeshAndShape));
+
+						undo.CommitAction(true);
+					}
 				}
 
 				UpdateEditToolMesh(terrain, tiles);
@@ -131,6 +156,43 @@ public partial class TerrainEditingControls
 		}
 	}
 
+	public void TerrainModifyHeight(Terrain terrain, byte[] data)
+	{
+		foreach (var (pos, corners) in Unpack(data)) {
+			var tile = terrain.GetTile(pos);
+			tile.Height = corners;
+			terrain.SetTile(pos, tile);
+		}
+	}
+
+	static byte[] Pack(IEnumerable<(TilePos Position, Corners<float> Corners)> data) {
+		using var stream = new MemoryStream();
+		using var writer = new BinaryWriter(stream);
+		foreach (var (pos, corners) in data) {
+			writer.Write(pos.X);
+			writer.Write(pos.Y);
+			writer.Write(corners.TopLeft);
+			writer.Write(corners.TopRight);
+			writer.Write(corners.BottomRight);
+			writer.Write(corners.BottomLeft);
+		}
+		return stream.ToArray();
+	}
+
+	static IEnumerable<(TilePos Position, Corners<float> Corners)> Unpack(byte[] data)
+	{
+		using var stream = new MemoryStream(data);
+		using var reader = new BinaryReader(stream);
+		while (stream.Position < stream.Length) {
+			var x = reader.ReadInt32();
+			var y = reader.ReadInt32();
+			var corners = new Corners<float>(
+				reader.ReadSingle(), reader.ReadSingle(),
+				reader.ReadSingle(), reader.ReadSingle());
+			yield return (new(x, y), corners);
+		}
+	}
+
 	void UpdateEditToolMesh(Terrain terrain, IEnumerable<TilePos> tiles)
 	{
 		if (terrain != _currentTerrain) ClearEditToolMesh();

terrain/editing/TerrainEditingControls.cs

@@ -7,7 +7,7 @@ public partial class TerrainEditingControls
 	public Slider                DrawSizeSlider      { get; private set; }
 	public Button[]              PaintTextureButtons { get; private set; }
 
-	public Button UpDownToggle    { get; private set; }
+	public Button RaiseLowerToggle { get; private set; }
 	public Button ConnectedToggle  { get; private set; }
 
 	public ToolMode  ToolMode  { get => GetToolMode (); set => SetToolMode (value); }
@@ -44,11 +44,11 @@ public partial class TerrainEditingControls
 		foreach (var (i, button) in PaintTextureButtons.Select((b, i) => (i, b)))
 			button.Pressed += () => SetTexture(i + 1);
 
-		var drawSizeLabel = GetNode<Label>("SizeLabel");
+		var drawSizeLabel = GetNode<Label> ("SizeLabel");
 		DrawSizeSlider    = GetNode<Slider>("SizeSlider");
 		DrawSizeSlider.ValueChanged += (_) => drawSizeLabel.Text = $"{DrawSize}";
 
-		UpDownToggle = GetNode<Button>("UpDown");
+		RaiseLowerToggle = GetNode<Button>("RaiseLower");
 		ConnectedToggle  = GetNode<Button>("Connected");
 	}
 
@@ -67,7 +67,7 @@ public partial class TerrainEditingControls
 		ToolShapeButtons[0].Item2.Icon = (value != ToolMode.Paint)
 			? CornerTextureNormal : CornerTexturePaint;
 
-		UpDownToggle.Disabled = value is ToolMode.Flatten or ToolMode.Paint;
+		RaiseLowerToggle.Disabled = value is ToolMode.Flatten or ToolMode.Paint;
 		ConnectedToggle.Disabled = value is ToolMode.Paint;
 	}
 

terrain/editing/TerrainEditingControls.tscn

@@ -9,8 +9,8 @@
 [ext_resource type="Texture2D" uid="uid://dc0q2xn2cgcjw" path="res://assets/textures/terrain/editing/corner_paint.png" id="3_e00xo"]
 [ext_resource type="Texture2D" uid="uid://2u1ldmh0osbx" path="res://assets/textures/terrain/editing/circle.png" id="2_yvc34"]
 [ext_resource type="Texture2D" uid="uid://btjd1704xtdjv" path="res://assets/textures/terrain/editing/square.png" id="3_aaaoe"]
-[ext_resource type="Texture2D" uid="uid://dxbfohim13ti1" path="res://assets/textures/terrain/editing/height_up.png" id="9_u4loi"]
-[ext_resource type="Texture2D" uid="uid://covyafauwthij" path="res://assets/textures/terrain/editing/height_down.png" id="10_owj33"]
+[ext_resource type="Texture2D" uid="uid://dxbfohim13ti1" path="res://assets/textures/terrain/editing/height_raise.png" id="9_u4loi"]
+[ext_resource type="Texture2D" uid="uid://covyafauwthij" path="res://assets/textures/terrain/editing/height_lower.png" id="10_owj33"]
 [ext_resource type="Texture2D" uid="uid://dsbovbbrtuv8f" path="res://assets/textures/terrain/editing/connected_on.png" id="8_4qifu"]
 [ext_resource type="Texture2D" uid="uid://c5j5v62f7p6qt" path="res://assets/textures/terrain/editing/connected_off.png" id="12_5hs2d"]
 [ext_resource type="Image" uid="uid://b0jp1dyxugbr7" path="res://assets/textures/terrain/grass.png" id="Image_d41co"]
@@ -91,7 +91,7 @@ value = -1.0
 [node name="HSeparator2" type="HSeparator" parent="."]
 layout_mode = 2
 
-[node name="UpDown" type="Button" parent="."]
+[node name="RaiseLower" type="Button" parent="."]
 layout_mode = 2
 toggle_mode = true
 button_pressed = true