RPSCustomPainter.dart

class RPSCustomPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    Paint paint = new Paint()
      ..color = Colors.blue
      ..style = PaintingStyle.stroke;
// Code for path
// From here ....
Path path = Path();
    path.moveTo(size.width * 0.07, size.height * 0.08);
    path.quadraticBezierTo(size.width * 0.07, size.height * 0.04,
        size.width * 0.13, size.height * 0.04);
    path.cubicTo(size.width * 0.32, size.height * 0.04, size.width * 0.68,
        size.height * 0.04, size.width * 0.87, size.height * 0.04);
    path.quadraticBezierTo(size.width * 0.93, size.height * 0.04,
        size.width * 0.93, size.height * 0.08);
    path.quadraticBezierTo(size.width * 0.93, size.height * 0.44,
        size.width * 0.93, size.height * 0.56);
    path.cubicTo(size.width * 0.93, size.height * 0.72, size.width * 0.61,
        size.height * 0.81, size.width * 0.53, size.height * 0.84);
    path.quadraticBezierTo(size.width * 0.49, size.height * 0.85,
        size.width * 0.46, size.height * 0.84);
    path.quadraticBezierTo(size.width * 0.07, size.height * 0.72,
        size.width * 0.07, size.height * 0.56);
    path.quadraticBezierTo(size.width * 0.07, size.height * 0.44,
        size.width * 0.07, size.height * 0.08);
    path.close();
// .... to here
canvas.drawPath(path, paint);
  }
@override
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return true;
  }
}