Added color picker tool, activated pressing Ctrl

Author: Daniele Tolomelli

lorien/InfiniteCanvas/Cursor/ColorPickerCursor/ColorPickerCursor.gd

@@ -0,0 +1,6 @@
+class_name ColorPickerCursor
+extends BaseCursor
+
+# -------------------------------------------------------------------------------------------------
+func _on_zoom_changed(zoom_value: float) -> void:
+	scale = Vector2.ONE / zoom_value

lorien/InfiniteCanvas/Cursor/ColorPickerCursor/ColorPickerCursor.tscn

@@ -0,0 +1,16 @@
+[gd_scene load_steps=5 format=3 uid="uid://dmybbclki2clv"]
+
+[ext_resource type="Shader" path="res://InfiniteCanvas/Cursor/cursor.gdshader" id="1_q5575"]
+[ext_resource type="Script" path="res://InfiniteCanvas/Cursor/ColorPickerCursor/ColorPickerCursor.gd" id="2_labi7"]
+[ext_resource type="Texture2D" uid="uid://tcovt1vw06tr" path="res://Assets/Icons/color_picker.png" id="3_rydea"]
+
+[sub_resource type="ShaderMaterial" id="1"]
+shader = ExtResource("1_q5575")
+
+[node name="ColorPickerCursor" type="Sprite2D"]
+material = SubResource("1")
+script = ExtResource("2_labi7")
+
+[node name="Sprite2D" type="Sprite2D" parent="."]
+position = Vector2(7, -7)
+texture = ExtResource("3_rydea")

lorien/InfiniteCanvas/InfiniteCanvas.gd

@@ -12,6 +12,7 @@ const PLAYER = preload("res://Misc/Player/Player.tscn")
 @onready var _circle_tool: CircleTool = $CircleTool
 @onready var _eraser_tool: EraserTool = $EraserTool
 @onready var _selection_tool: SelectionTool = $SelectionTool
+@onready var _color_picker_tool: ColorPickerTool = $ColorPickerTool
 @onready var _active_tool: CanvasTool = _brush_tool
 @onready var _active_tool_type: int = Types.Tool.BRUSH
 @onready var _strokes_parent: Node2D = $SubViewport/Strokes
@@ -88,6 +89,16 @@ func _process_event(event: InputEvent) -> void:
 			else:
 				# restore tool from type
 				use_tool(_active_tool_type)
+	
+	if event is InputEventKey:
+		var keyEvent: InputEventKey = event as InputEventKey
+		if keyEvent.keycode == KEY_CTRL:
+			if keyEvent.pressed:
+				var tool_type := _active_tool_type
+				use_tool(Types.Tool.COLOR_PICKER)
+				_active_tool_type = tool_type
+			else:
+				use_tool(_active_tool_type)
 
 	if event.is_action("deselect_all_strokes"):
 		if _active_tool == _selection_tool:
@@ -133,6 +144,10 @@ func use_tool(tool_type: int) -> void:
 		Types.Tool.SELECT:
 			_active_tool = _selection_tool
 			_use_optimizer = false
+		Types.Tool.COLOR_PICKER:
+			_active_tool = _color_picker_tool
+			_use_optimizer = false
+		
 
 	if prev_tool != _active_tool:
 		prev_tool.enabled = false

lorien/InfiniteCanvas/InfiniteCanvas.tscn

@@ -9,12 +9,14 @@
 [ext_resource type="Script" path="res://InfiniteCanvas/Tools/SelectionTool.gd" id="7"]
 [ext_resource type="PackedScene" path="res://InfiniteCanvas/Cursor/SelectionCursor/SelectionCursor.tscn" id="8"]
 [ext_resource type="Script" path="res://InfiniteCanvas/Tools/SelectionRectangle.gd" id="9"]
+[ext_resource type="Script" path="res://InfiniteCanvas/Tools/ColorPickerTool.gd" id="9_xqyd5"]
 [ext_resource type="Shader" path="res://InfiniteCanvas/Tools/selection_rectangle.gdshader" id="10"]
 [ext_resource type="Script" path="res://InfiniteCanvas/Tools/RectangleTool.gd" id="11"]
 [ext_resource type="Script" path="res://InfiniteCanvas/InfiniteCanvasGrid.gd" id="12"]
 [ext_resource type="Script" path="res://InfiniteCanvas/Tools/CircleTool.gd" id="13"]
 [ext_resource type="Script" path="res://InfiniteCanvas/Tools/EraserTool.gd" id="14"]
 [ext_resource type="Script" path="res://InfiniteCanvas/DebugDraw.gd" id="15"]
+[ext_resource type="PackedScene" uid="uid://dmybbclki2clv" path="res://InfiniteCanvas/Cursor/ColorPickerCursor/ColorPickerCursor.tscn" id="16_mifpa"]
 
 [sub_resource type="ShaderMaterial" id="1"]
 shader = ExtResource("10")
@@ -55,6 +57,10 @@ script = ExtResource("7")
 selection_rectangle_path = NodePath("../SubViewport/SelectionRectangle")
 cursor_path = NodePath("../SubViewport/SelectionCursor")
 
+[node name="ColorPickerTool" type="Node" parent="."]
+script = ExtResource("9_xqyd5")
+cursor_path = NodePath("../SubViewport/ColorPickerCursor")
+
 [node name="SubViewport" type="SubViewport" parent="."]
 handle_input_locally = false
 size = Vector2i(1920, 1080)
@@ -80,3 +86,5 @@ script = ExtResource("9")
 [node name="BrushCursor" parent="SubViewport" instance=ExtResource("4")]
 
 [node name="SelectionCursor" parent="SubViewport" instance=ExtResource("8")]
+
+[node name="ColorPickerCursor" parent="SubViewport" instance=ExtResource("16_mifpa")]

lorien/InfiniteCanvas/Tools/ColorPickerTool.gd

@@ -0,0 +1,26 @@
+class_name ColorPickerTool extends CanvasTool
+
+# -------------------------------------------------------------------------------------------------
+func tool_event(event: InputEvent) -> void:
+	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT and event.is_pressed():
+		var mouseEvent = event as InputEventMouseButton
+		var picked_color = _pick_color(mouseEvent.position)
+		if picked_color != Color.TRANSPARENT:
+			GlobalSignals.color_changed.emit(picked_color)
+
+
+# -------------------------------------------------------------------------------------------------
+func _pick_color(pos: Vector2) -> Color:
+	var colorPicked =  _canvas._viewport.get_texture().get_image().get_pixel(pos.x, pos.y)
+	# the exact color picked may be a hue of the original stroke because of antialiasing
+	# to fix this, search along every stroke for the color that has an more equal color the picked one
+	var minDelta = 0.5;
+	var bestColorMatch = Color.TRANSPARENT
+	var strokes = _canvas.get_all_strokes()
+	for stroke in strokes:
+		var c = stroke.color
+		var colorDelta = abs(colorPicked.r - c.r) + abs(colorPicked.g - c.g) + abs(colorPicked.b - c.b)
+		if colorDelta < minDelta:
+			bestColorMatch = c
+			minDelta = colorDelta
+	return bestColorMatch

lorien/Main.gd

@@ -52,6 +52,7 @@ func _ready() -> void:
 
 	_brush_color_picker.closed.connect(_on_BrushColorPicker_closed)
 	_brush_color_picker.color_changed.connect(_on_BrushColorPicker_color_changed)
+	GlobalSignals.connect("color_changed", self._on_BrushColorPicker_color_changed)
 
 	_new_palette_dialog.new_palette_created.connect(_on_NewPaletteDialog_new_palette_created)
 	_delete_palette_dialog.palette_deleted.connect(_on_DeletePaletteDialog_palette_deleted)

lorien/Misc/GlobalSignals.gd

@@ -3,3 +3,4 @@ extends Node
 # -------------------------------------------------------------------------------------------------
 signal language_changed
 signal keybinding_changed(action: KeybindingsManager.Action)
+signal color_changed(color: Color)

lorien/Misc/Types.gd

@@ -9,6 +9,7 @@ enum Tool {
 	LINE,
 	ERASER,
 	SELECT,
+	COLOR_PICKER
 }
 
 # -------------------------------------------------------------------------------------------------