Moving/Dragging

You can use BoxTransformer.move to translate a box by some amount of pixels.

Moving a box

  final Box rect = Box.fromLTWH(50, 50, 100, 100);
  final MoveResult result = BoxTransformer.move(
    initialRect: rect,
    initialLocalPosition: Vector2.zero(),
    localPosition: Vector2.zero(),
  );

  result.position; // the new position of the box

BoxTransformer.move returns a MoveResult that contains information about the new position of the box. result.position is a Vector2 that defines the new position of the box.

Limiting movements#

You can limit the movements by providing clampingRect to BoxTransformer.move to limit the movements to a specific area.

Limiting movements

  final Box rect = Box.fromLTWH(50, 50, 100, 100);
  final MoveResult result = BoxTransformer.move(
    initialRect: rect,
    initialLocalPosition: Vector2.zero(),
    localPosition: Vector2.zero(),
    clampingRect: Box.fromLTWH(0, 0, 1000, 1000),
  );

  result.position; // the new position of the box