getArrowPath method
Implementation
Path getArrowPath(Size size) {
final Path path = Path();
path.moveTo(0, 0);
path.lineTo(size.width * 3.5 / 4, 0.0);
path.lineTo(size.width, size.height / 2);
path.lineTo(size.width * 3.5 / 4, size.height);
path.lineTo(0.0, size.height);
path.close();
return path;
}