cut method

Implementation

List<Rect> cut() {
  final cell = this.cell;
  final width = cell.x;
  final height = cell.y;
  final top = row * height;

  return List.generate(
    frames,
    (frame) => Rect.fromLTWH(
      (start + frame) * width,
      top,
      width,
      height,
    ),
    growable: false,
  );
}