getClip method
Returns a description of the clip given that the render object being clipped is of the given size.
Implementation
@override
Path getClip(Size size) {
final path = new Path();
if (!up) path.moveTo(0.0, size.height);
path.cubicTo(
0.0,
up ? 0.0 : size.height,
size.width / 2,
up ? offset * 2 : size.height - offset * 2,
size.width,
up ? 0.0 : size.height);
path.close();
return path;
}