class BottomClipper extends CustomClipper<Path> {
@override
Path getClip(Size size) {//child 元素的size
var path = Path();
path.lineTo(0, 0);//起始点
path.lineTo(0, size.height - 30);//第二个点
var controlPoint = Offset(size.width/4, size.height);//控制点
var endPoint = Offset(size.width/2, size.height - 30);//结束点
path.quadraticBezierTo(controlPoint.dx, controlPoint.dy, endPoint.dx, endPoint.dy);// 画了贝塞尔曲线
var controlPoint2 = Offset(size.width / 4 * 3, size.height - 60);//第2个控制点
var endPoint2 = Offset(size.width, size.height - 30);//第二个结束点
path.quadraticBezierTo(controlPoint2.dx, controlPoint2.dy, endPoint2.dx, endPoint2.dy);
path.lineTo(size.width, size.height - 30);
path.lineTo(size.width, 0);//第四个点
return path;
}
@override
bool shouldReclip(CustomClipper<Path> oldClipper) => false;
}
总结：
