export method

Implementation

Future<Uint8List?> export(Size canvasSize) async {
  var recorder = PictureRecorder();
  var origin = const Offset(0.0, 0.0);
  var paintBounds = Rect.fromPoints(
    canvasSize.topLeft(origin),
    canvasSize.bottomRight(origin),
  );
  var canvas = Canvas(recorder, paintBounds);
  paint(canvas, canvasSize);
  var picture = recorder.endRecording();
  var image = await Future.value(picture.toImage(
    canvasSize.width.round(),
    canvasSize.height.round(),
  ));
  ByteData? bytes = await image.toByteData(format: ImageByteFormat.png);
  return bytes?.buffer.asUint8List();
}