How to create a Sine Wave Clipper in Flutter? - flutter

Question

I want to create a Custom Clipper like the image below.

Answer 1

Finally figured it out.
Clip Widget
ClipPath(
child: Container(
height: 8,
width: double.infinity,
color: Colors.white,
),
clipper: WaveClipper(),
),
Wave Clipper
class WaveClipper extends CustomClipper<Path> {
#override
Path getClip(Size size) {
var path = Path();
path.lineTo(0, size.height);
var x = 0.0;
var numberOfWaves = 30;
var increment = size.width / numberOfWaves;
bool startFromTop = false;
while (x < size.width) {
if (startFromTop) {
path.lineTo(x, 0);
path.cubicTo(x + increment / 2, 0, x + increment / 2, size.height,
x + increment, size.height);
} else {
path.lineTo(x, size.height);
path.cubicTo(x + increment / 2, size.height, x + increment / 2, 0,
x + increment, 0);
}
x += increment;
startFromTop = !startFromTop;
}
path.lineTo(size.width, 0);
path.lineTo(0, 0);
path.close();
return path;
}
#override
bool shouldReclip(CustomClipper<Path> oldClipper) => false;
}

Answer 2

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
home: MyHomePage(title: 'Flutter'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
widget.title,
style: TextStyle(color: Colors.white),
),
),
body: Padding(
padding: const EdgeInsets.all(30.0),
child: ClipPath(
child: Container(
width: MediaQuery.of(context).size.width,
height: 200,
color: Colors.grey,
),
clipper: CustomClipPath(),
),
),
);
}
}
class CustomClipPath extends CustomClipper<Path> {
Path getClip(Size size) {
var path = new Path();
path.lineTo(0.0, 40.0);
path.lineTo(0.0, size.height);
path.lineTo(size.width, size.height);
path.lineTo(size.width, 40.0);
for (int i = 0; i < 10; i++) {
if (i % 2 == 0) {
path.quadraticBezierTo(
size.width - (size.width / 16) - (i * size.width / 8),
0.0,
size.width - ((i + 1) * size.width / 8),
size.height - 160);
} else {
path.quadraticBezierTo(
size.width - (size.width / 16) - (i * size.width / 8),
size.height - 120,
size.width - ((i + 1) * size.width / 8),
size.height - 160);
}
}
path.lineTo(0.0, 40.0);
path.close();
return path;
}
#override
bool shouldReclip(CustomClipper<Path> oldClipper) => false;
}