flutter-贝塞尔曲线

import 'package:flutter/material.dart';

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: <Widget>[
          ClipPath(
            clipper: BottomClipper(),//路径
            child: Container(
              color: Colors.deepOrange,
              height: 200,
            ),
          )
        ],
      ),
    );
  }
}

class BottomClipper extends CustomClipper<Path>{
  @override
  Path getClip(Size size) {
    var path=Path();
    path.lineTo(0, 0);
    path.lineTo(0, size.height-30);
    var firstControlPoint =Offset(size.width/2,size.height);
    var firstEndPoint = Offset(size.width,size.height-30);
     path.quadraticBezierTo(firstControlPoint.dx, firstControlPoint.dy, firstEndPoint.dx, firstEndPoint.dy);
    path.lineTo(size.width, size.height-30);
    path.lineTo(size.width, 0);
    return path;
  }

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

 

 

双曲线

 

import 'package:flutter/material.dart';

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: <Widget>[
          ClipPath(
            clipper: BottomClipper(),//路径
            child: Container(
              color: Colors.deepOrange,
              height: 200,
            ),
          )
        ],
      ),
    );
  }
}

class BottomClipper extends CustomClipper<Path>{
  @override
  Path getClip(Size size) {
    var path=Path();
    path.lineTo(0, 0);
    path.lineTo(0, size.height-20);
    path.lineTo(0, size.height-20);
      var firstControlPoint =Offset(size.width/4,size.height);
      var firstEndPoint = Offset(size.width/2.25,size.height-30);

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

      var secondControlPoint = Offset(size.width/4*3,size.height-80);
      var secondEndPoint = Offset(size.width,size.height-40);

      path.quadraticBezierTo(secondControlPoint.dx, secondControlPoint.dy, secondEndPoint.dx, secondEndPoint.dy);

    path.lineTo(size.width, size.height-40);
    path.lineTo(size.width, 0);

    return path;
  }

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