Changes to terrain editing controls

- Added new buttons:
  - Flatten tool mode (not implemented)
  - Up / down toggle modifier
    Switches between moving terrain up or down
  - Connected toggle modifier
    Used to cause corners to be disconnected
- Added ModifierToggleButton script
  Inversed by holding modifier button
- "Corner" tool shape button switches
  to single tile texture in paint mode
- Modify editing code to use modifier buttons

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

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

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+process/hdr_clamp_exposure=false
+process/size_limit=0
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assets/textures/terrain/editing/corner.png.import

@@ -31,4 +31,4 @@ process/normal_map_invert_y=false
 process/hdr_as_srgb=false
 process/hdr_clamp_exposure=false
 process/size_limit=0
-detect_3d/compress_to=1
+detect_3d/compress_to=0

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

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+metadata={
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+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

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

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+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

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

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+process/size_limit=0
+detect_3d/compress_to=1

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

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+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

terrain/editing/ModifierToggleButton.cs

@@ -0,0 +1,17 @@
+[Tool]
+public partial class ModifierToggleButton : Button
+{
+	[Export] public Texture2D OnTexture { get; set; }
+	[Export] public Texture2D OffTexture { get; set; }
+	[Export] public Key ModifierKey { get; set; }
+
+
+	public override void _Ready()
+		=> Toggled += (on) => Icon = on ? OnTexture : OffTexture;
+
+	public override void _Input(InputEvent ev)
+	{
+		if ((ev is InputEventKey { Keycode: var key }) && (key == ModifierKey))
+			ButtonPressed = !ButtonPressed;
+	}
+}

terrain/editing/TerrainEditingControls+Editing.cs

@@ -74,23 +74,22 @@ public partial class TerrainEditingControls
 					_ => throw new InvalidOperationException(),
 				}).ToHashSet();
 
-				// TODO: Handle different tool modes, such as painting.
+				// TODO: Handle different tool modes, such as flatten and painting.
-				// TODO: Add a flatten tool mode: Flattens everything selected to nearest corner height.
 				// TODO: Allow click-dragging which doesn't affect already changed tiles / corners.
 				// TODO: Support undo and redo.
-				// TODO: Support "disconnected" mode which can create vertical cliffs.
+				// TODO: Make mesh generation generate vertical walls between disconnected corners.
+				// TODO: Use ArrayMesh instead of ImmediateMesh.
 
 				// Raise / lower the terrain if left / right mouse button is pressed.
-				if ((mouse is InputEventMouseButton { ButtonIndex: var button, Pressed: true })
+				if (mouse is InputEventMouseButton { ButtonIndex: MouseButton.Left, Pressed: true }) {
-				 && (button is MouseButton.Left or MouseButton.Right))
-				{
 					GetViewport().SetInputAsHandled();
 
 					const float AdjustHeight = 0.5f;
-					var amount = (button == MouseButton.Left)
+					var amount = UpDownToggle.ButtonPressed ? AdjustHeight : -AdjustHeight;
-						? AdjustHeight : -AdjustHeight;
 
-					// Find corners that are "connected" and should be raised.
+					// 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);
@@ -112,6 +111,7 @@ public partial class TerrainEditingControls
 								tile2.Height[corner2] += amount;
 							terrain.SetTile(pos, tile2);
 						}
+					}
 
 					// Raise selected tiles themselves.
 					foreach (var pos in tiles) {

terrain/editing/TerrainEditingControls.cs

@@ -4,18 +4,25 @@ public partial class TerrainEditingControls
 {
 	public (ToolMode , Button)[] ToolModeButtons     { get; private set; }
 	public (ToolShape, Button)[] ToolShapeButtons    { get; private set; }
-	public Button[]              PaintTextureButtons { get; private set; }
 	public Slider                DrawSizeSlider      { get; private set; }
+	public Button[]              PaintTextureButtons { get; private set; }
+
+	public Button UpDownToggle    { get; private set; }
+	public Button ConnectedToggle { get; private set; }
 
 	public ToolMode  ToolMode  { get => GetToolMode (); set => SetToolMode (value); }
 	public ToolShape ToolShape { get => GetToolShape(); set => SetToolShape(value); }
 	public int       DrawSize  { get => GetDrawSize (); set => SetDrawSize (value); }
 	public int       Texture   { get => GetTexture  (); set => SetTexture  (value); }
 
+	[Export] public Texture2D CornerTextureNormal { get; set; }
+	[Export] public Texture2D CornerTexturePaint { get; set; }
+
 	public override void _Ready()
 	{
 		ToolModeButtons = [
 			(ToolMode.Height , GetNode<Button>("Height" )),
+			(ToolMode.Flatten, GetNode<Button>("Flatten")),
 			(ToolMode.Paint  , GetNode<Button>("Paint"  )),
 		];
 		ToolShapeButtons = [
@@ -40,6 +47,9 @@ public partial class TerrainEditingControls
 		var drawSizeLabel = GetNode<Label>("SizeLabel");
 		DrawSizeSlider = GetNode<Slider>("SizeSlider");
 		DrawSizeSlider.ValueChanged += (_) => drawSizeLabel.Text = $"{DrawSize}";
+
+		UpDownToggle = GetNode<Button>("UpDown");
+		ConnectedToggle = GetNode<Button>("Connected");
 	}
 
 	ToolMode GetToolMode()
@@ -51,6 +61,14 @@ public partial class TerrainEditingControls
 			button.Flat = !(button.ButtonPressed = value == mode);
 		foreach (var button in PaintTextureButtons)
 			button.Disabled = value != ToolMode.Paint;
+
+		// In paint mode, `ToolShape.Corner` affects a single tile regardless
+		// of `DrawSize`. This changes the button's icon to communicate that.
+		ToolShapeButtons[0].Item2.Icon = (value != ToolMode.Paint)
+			? CornerTextureNormal : CornerTexturePaint;
+
+		UpDownToggle.Disabled = value is ToolMode.Flatten or ToolMode.Paint;
+		ConnectedToggle.Disabled = value is ToolMode.Paint;
 	}
 
 	ToolShape GetToolShape()
@@ -88,6 +106,7 @@ public partial class TerrainEditingControls
 public enum ToolMode
 {
 	Height,
+	Flatten,
 	Paint,
 }
 

terrain/editing/TerrainEditingControls.tscn

@@ -1,11 +1,18 @@
-[gd_scene load_steps=15 format=3 uid="uid://bmljchm3fj42"]
+[gd_scene load_steps=18 format=3 uid="uid://bmljchm3fj42"]
 
 [ext_resource type="Script" path="res://terrain/editing/TerrainEditingControls.cs" id="1_fklx3"]
-[ext_resource type="Texture2D" uid="uid://btl3jsqeldix2" path="res://assets/textures/terrain/editing/corner.png" id="1_w5qr7"]
+[ext_resource type="Script" path="res://terrain/editing/ModifierToggleButton.cs" id="9_7fwmx"]
 [ext_resource type="Texture2D" uid="uid://dqbtbf8pe05qv" path="res://assets/textures/terrain/editing/height.png" id="2_hrmm4"]
-[ext_resource type="Texture2D" uid="uid://2u1ldmh0osbx" path="res://assets/textures/terrain/editing/circle.png" id="2_yvc34"]
+[ext_resource type="Texture2D" uid="uid://bcb8w33ns56go" path="res://assets/textures/terrain/editing/flatten.png" id="3_gvr2t"]
 [ext_resource type="Texture2D" uid="uid://btdpyu4n3pgkx" path="res://assets/textures/terrain/editing/paint.png" id="3_5x55r"]
+[ext_resource type="Texture2D" uid="uid://btl3jsqeldix2" path="res://assets/textures/terrain/editing/corner.png" id="1_w5qr7"]
+[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://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"]
 [ext_resource type="Image" uid="uid://bpo7mkr6sctqr" path="res://assets/textures/terrain/dirt.png" id="Image_y3rra"]
 [ext_resource type="Image" uid="uid://dqyqg6yt7yk3k" path="res://assets/textures/terrain/rock.png" id="Image_x8cdn"]
@@ -25,6 +32,8 @@ image = ExtResource("Image_sb66e")
 
 [node name="TerrainEditingControls" type="VBoxContainer"]
 script = ExtResource("1_fklx3")
+CornerTextureNormal = ExtResource("1_w5qr7")
+CornerTexturePaint = ExtResource("3_e00xo")
 
 [node name="Height" type="Button" parent="."]
 layout_mode = 2
@@ -32,6 +41,12 @@ toggle_mode = true
 button_pressed = true
 icon = ExtResource("2_hrmm4")
 
+[node name="Flatten" type="Button" parent="."]
+layout_mode = 2
+toggle_mode = true
+icon = ExtResource("3_gvr2t")
+flat = true
+
 [node name="Paint" type="Button" parent="."]
 layout_mode = 2
 toggle_mode = true
@@ -76,6 +91,29 @@ value = -1.0
 [node name="HSeparator2" type="HSeparator" parent="."]
 layout_mode = 2
 
+[node name="UpDown" type="Button" parent="."]
+layout_mode = 2
+toggle_mode = true
+button_pressed = true
+icon = ExtResource("9_u4loi")
+script = ExtResource("9_7fwmx")
+OnTexture = ExtResource("9_u4loi")
+OffTexture = ExtResource("10_owj33")
+ModifierKey = 4194325
+
+[node name="Connected" type="Button" parent="."]
+layout_mode = 2
+toggle_mode = true
+button_pressed = true
+icon = ExtResource("8_4qifu")
+script = ExtResource("9_7fwmx")
+OnTexture = ExtResource("8_4qifu")
+OffTexture = ExtResource("12_5hs2d")
+ModifierKey = 4194326
+
+[node name="HSeparator3" type="HSeparator" parent="."]
+layout_mode = 2
+
 [node name="Grass" type="Button" parent="."]
 layout_mode = 2
 theme_override_colors/icon_normal_color = Color(0.752941, 0.752941, 0.752941, 1)