generateImage method

Future generateImage(dynamic kCanvasSize)

Implementation

Future generateImage(kCanvasSize) async {

 ByteData imgBytes;
  final recorder = ui.PictureRecorder();
  final canvas = Canvas(recorder,
      Rect.fromPoints(Offset(0.0, 0.0), Offset(kCanvasSize, kCanvasSize)));

  final stroke = Paint()
    ..color = Colors.black
    ..style = PaintingStyle.stroke;

  // canvas.drawRect(Rect.fromLTWH(0.0, 0.0, kCanvasSize, kCanvasSize), stroke);

  final paint = Paint()
    ..color = Colors.black
    ..style = PaintingStyle.fill;
List<Offset> offsetPoints = [];
  for (int i = 0; i < points.length - 1; i++) {
    if (points[i] != null && points[i + 1] != null) {

      canvas.drawLine(points[i].points, points[i + 1].points,
          points[i].paint);
    } else if (points[i] != null && points[i + 1] == null) {

      offsetPoints.clear();
      offsetPoints.add(points[i].points);
      offsetPoints.add(Offset(
          points[i].points.dx + 0.1, points[i].points.dy + 0.1));
      canvas.drawPoints(PointMode.points, offsetPoints, points[i].paint);
    }
  }

  final picture = recorder.endRecording();
  final img = await picture.toImage(400, 600);
  final pngBytes = await img.toByteData(format: ImageByteFormat.png);
 imgBytes = pngBytes!;
 return imgBytes;


}