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) {
return Path()
..addOval(
Rect.fromCircle(
center: Offset(size.width / 2, size.height / 2),
radius: _getDiagonal(size) / 2 * animation.value,
),
);
}