reset method

@override dynamic reset()

重置

Implementation

@override
reset() {
  var rect = PrinterRect.fromLTWH(0, 0, pageSize!.width!, pageSize!.height!);
  recorder = PictureRecorder();
  canvas = Canvas(recorder!, Rect.fromLTRB(rect.left, rect.top, rect.right, rect.bottom));
  picture = null;
}