如何在容器中创建类似于此的曲线。
如果您需要为存放个人资料图片的容器创建曲线,您最好使用带有自定义剪切器的ClipPath。
以下类似代码可以解决问题:
ClipPath(
clipper: CurveClipper(),
child: Container(
color: Colors.red,
height: 200.0,
),
);
我们定制的CurveClipper
需要我们绘制一个包含贝塞尔曲线的路径,以获得容器底部的曲线形状:
class CurveClipper extends CustomClipper<Path> {
@override
Path getClip(Size size) {
int curveHeight = 40;
Offset controlPoint = Offset(size.width / 2, size.height + curveHeight);
Offset endPoint = Offset(size.width, size.height - curveHeight);
Path path = Path()
..lineTo(0, size.height - curveHeight)
..quadraticBezierTo(controlPoint.dx, controlPoint.dy, endPoint.dx, endPoint.dy)
..lineTo(size.width, 0)
..close();
return path;
}
@override
bool shouldReclip(CustomClipper<Path> oldClipper) => false;
}
实际上,在这张图片中使用的是圆角的AppBar。要实现这个效果:
AppBar(
title: Text('Anything'),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.vertical(
bottom: Radius.circular(30),
),
),
),
如果您想要这种形状的容器:
Container(
height: 200.0,
decoration: new BoxDecoration(
color: Colors.red,
borderRadius: BorderRadius.vertical(
bottom: Radius.elliptical(
MediaQuery.of(context).size.width, 100.0)),
),
),
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: ProfileScreen(),
);
}
}
// class to draw the profile screen
class ProfileScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
appBar: AppBar(
elevation: 0.0,
backgroundColor: const Color(0xffea5d49),
leading: Icon(
Icons.menu,
color: Colors.white,
),
),
body: Stack(
alignment: Alignment.center,
children: [
CustomPaint(
child: Container(
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height,
),
painter: HeaderCurvedContainer(),
),
Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Padding(
padding: const EdgeInsets.all(20.0),
child: Text(
'Profile',
style: TextStyle(
fontSize: 35.0,
letterSpacing: 1.5,
color: Colors.white,
fontWeight: FontWeight.w600,
),
),
),
Container(
width: MediaQuery.of(context).size.width / 2,
height: MediaQuery.of(context).size.width / 2,
padding: const EdgeInsets.all(10.0),
decoration: BoxDecoration(
shape: BoxShape.circle,
color: Colors.white,
// image: DecorationImage(
// image: AssetImage(null),
// fit: BoxFit.cover,
// ),
),
),
],
),
],
),
),
);
}
}
// CustomPainter class to for the header curved-container
class HeaderCurvedContainer extends CustomPainter {
@override
void paint(Canvas canvas, Size size) {
Paint paint = Paint()..color = const Color(0xffea5d49);
Path path = Path()
..relativeLineTo(0, 150)
..quadraticBezierTo(size.width / 2, 250.0, size.width, 150)
..relativeLineTo(0, -150)
..close();
canvas.drawPath(path, paint);
}
@override
bool shouldRepaint(CustomPainter oldDelegate) => false;
}