Drawing.tscn

[gd_scene load_steps=2 format=3 uid="uid://r5o6c5lg4s1i"]

[sub_resource type="GDScript" id="GDScript_kr0f6"]
script/source = "extends CanvasLayer

var drawing = false
var path = PackedVector2Array()
var zoom_speed = 0.1
var max_zoom_out = 0.5  # Set your desired maximum zoom-out value
var base_line_width = 5  # Set your desired base line width

var camera_2d: Camera2D = null

func _ready():
	set_process_input(true)
	camera_2d = $Camera2D

func _input(event):
	if event is InputEventMouseButton:
		if event.button_index == MOUSE_BUTTON_LEFT:
			drawing = event.pressed
			if drawing:
				path.clear()
				path.append(_get_world_mouse_position(event.position))
			else:
				# Finish drawing
				path.append(_get_world_mouse_position(event.position))
				draw_path()

	elif event is InputEventMouseMotion and drawing:
		path.append(_get_world_mouse_position(event.position))
		draw_path()

	elif event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_MIDDLE:
		# Middle mouse button to pan the camera
		if event.pressed:
			camera_2d.set_drag_enabled(true)
		else:
			camera_2d.set_drag_enabled(false)

	elif event is InputEventKey:
		if event.keycode == KEY_I:
			print(\"Zoom in\")
			# Zoom in
			camera_2d.zoom /= (1.0 - zoom_speed)

		elif event.keycode == KEY_O:
			print(\"Zoom out\")
			# Zoom out
			camera_2d.zoom *= 1.0 - zoom_speed

			# Ensure a minimum zoom level
			camera_2d.zoom = max(camera_2d.zoom, max_zoom_out)

func draw_path():
	var line = Line2D.new()

	# Adjust the line width inversely proportional to the camera zoom
	line.width = base_line_width / camera_2d.zoom

	line.points = path
	add_child(line)

func _get_world_mouse_position(original_position):
	# Convert the mouse position to world coordinates using the camera
	var ray_origin = camera_2d.project_ray_origin(original_position)
	var ray_direction = camera_2d.project_ray_normal(original_position)
	var intersection = ray_origin + ray_direction * camera_2d.zfar

	return intersection
"

[node name="Node2D" type="CanvasLayer"]
script = SubResource("GDScript_kr0f6")

[node name="Camera2D" type="Camera2D" parent="."]