getClip method

@override Path getClip(Size size)

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 double w = size.width;
  final double h = size.height;

  final Path path = Path();

  if (fillAlignment == FillAlignment.top) {
    path
      ..moveTo(0, -fillOffset)
      ..lineTo(w, -fillOffset)
      ..lineTo(w, h * animation.value - fillOffset * (1 - animation.value))
      ..quadraticBezierTo(w / 2, h * animation.value, 0,
          h * animation.value - fillOffset * (1 - animation.value))
      ..close();
  } else if (fillAlignment == FillAlignment.right) {
    path
      ..moveTo(w + fillOffset, 0)
      ..lineTo(w + fillOffset, h)
      ..lineTo((w + fillOffset) * (1 - animation.value), h)
      ..quadraticBezierTo(
        (w - (fillOffset - 1)) * (1 - animation.value),
        h / 2,
        (w + fillOffset) * (1 - animation.value),
        0,
      )
      ..close();
  } else if (fillAlignment == FillAlignment.bottom) {
    path
      ..moveTo(0, h + fillOffset)
      ..lineTo(w, h + fillOffset)
      ..lineTo(w, (h + fillOffset) * (1 - animation.value))
      ..quadraticBezierTo(
          w / 2,
          (h - (fillOffset - 1)) * (1 - animation.value),
          0,
          (h + fillOffset) * (1 - animation.value))
      ..close();
  } else {
    path
      ..moveTo(-fillOffset, 0)
      ..lineTo(-fillOffset, h)
      ..lineTo(w * animation.value - fillOffset * (1 - animation.value), h)
      ..quadraticBezierTo(
        (w + fillOffset - 1) * animation.value,
        h / 2,
        w * animation.value - fillOffset * (1 - animation.value),
        0,
      )
      ..close();
  }

  return path;
}