huixiang_app/lib/utils/bg_clipper.dart

import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';

class BackGroundClipper extends CustomClipper<Path> {

  @override
  Path getClip(Size size) {
    //创建 Path
    Path path = Path();
    //移动到点 P0点 也是曲线的起点
    path.lineTo(0, 0);
    path.lineTo(size.width, 0);
    path.lineTo(size.width, size.height - 30.h);

    path.quadraticBezierTo(size.width / 2.0, size.height, 0, size.height - 30.h);

    path.close();
    return path;
  }

  @override
  bool shouldReclip(CustomClipper<Path> oldClipper) {
    return true;
  }
}