Initial commit

scripts/camera_controller.gd

@@ -0,0 +1,42 @@
+class_name CameraController extends Camera2D
+
+const DRAG_THRESHOLD := 8.0
+
+var _dragging := false
+var _left_pending := false
+var _drag_start := Vector2.ZERO
+
+
+func _unhandled_input(event: InputEvent) -> void:
+	if event is InputEventMouseButton:
+		match event.button_index:
+			MOUSE_BUTTON_LEFT:
+				if event.pressed:
+					_left_pending = true
+					_drag_start = event.position
+				else:
+					_left_pending = false
+					if _dragging:
+						_dragging = false
+						Input.set_default_cursor_shape(Input.CURSOR_ARROW)
+						get_viewport().set_input_as_handled()
+			MOUSE_BUTTON_MIDDLE:
+				if event.pressed:
+					_dragging = true
+					_drag_start = event.position
+					Input.set_default_cursor_shape(Input.CURSOR_DRAG)
+				else:
+					_dragging = false
+					Input.set_default_cursor_shape(Input.CURSOR_ARROW)
+				get_viewport().set_input_as_handled()
+	elif event is InputEventMouseMotion:
+		if _left_pending and not _dragging:
+			if event.position.distance_to(_drag_start) >= DRAG_THRESHOLD:
+				_dragging = true
+				_left_pending = false
+				Input.set_default_cursor_shape(Input.CURSOR_DRAG)
+		if _dragging:
+			var delta: Vector2 = _drag_start - event.position
+			_drag_start = event.position
+			position += delta / zoom
+			get_viewport().set_input_as_handled()