flutter - 如何在 Flutter 中为容器提供自定义边框？

Question

我想把向外弯曲的边框放在左下角，把向内的边框放在右边，只是想让这个图案与之相反。这是我的 CustomClipper 代码

var path = Path();
path.lineTo(0, size.height * .65);

var firstControlPoint = Offset(0, size.height * .75);
var firstEndPoint = Offset(size.width / 6, size.height * .75);

path.quadraticBezierTo(firstControlPoint.dx, firstControlPoint.dy,
    firstEndPoint.dx, firstEndPoint.dy);

path.lineTo(size.width / 1.2, size.height * .75);

var secControlPoint = Offset(size.width, size.height * .75);
var secEndPoint = Offset(size.width, size.height * 0.85);

path.quadraticBezierTo(
    secControlPoint.dx, secControlPoint.dy, secEndPoint.dx, secEndPoint.dy);

path.lineTo(size.width, 0);
path.close();

return path;

图片：