[英]Flutter: How to custom clip an image from bottom to up?
我正在開發一個顫振項目並嘗試剪輯圖像。 下面是我的代碼
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
final appTitle = 'Drawer Demo';
@override
Widget build(BuildContext context) {
return MaterialApp(
title: appTitle,
home: MyHomePage(title: appTitle),
);
}
}
class MyHomePage extends StatelessWidget {
final String title;
var scaffoldKey = GlobalKey<ScaffoldState>();
MyHomePage({Key key, this.title}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("THIS IS APP BAR"),),
body: Stack(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(bottom: 2.0),
child:ClipPath(
clipper: ClippingClass(),
child: Container(
width: MediaQuery
.of(context)
.size
.width,
height: 320.0,
decoration: BoxDecoration(
image: DecorationImage(
fit: BoxFit.cover,
image: NetworkImage(
"https://picsum.photos/250?image=9"))
),
),
),
),
],
),
);
}
}
class ClippingClass extends CustomClipper<Path> {
@override
Path getClip(Size size) {
var path = Path();
path.lineTo(0.0, size.height-40);
path.quadraticBezierTo(size.width / 4, size.height,
size.width / 2, size.height);
path.quadraticBezierTo(size.width - (size.width / 4), size.height,
size.width, size.height - 40);
path.lineTo(size.width, 0.0);
path.close();
return path;
}
@override
bool shouldReclip(CustomClipper<Path> oldClipper) => false;
}
下面是結果。
然而,我的目的不是讓曲線從下到上。 相反,我從下到下都有它。
我需要的是如下(忽略線條,它們是來自 Adobe XD 的指導線)
我怎樣才能做到這一點?
您只需要在正在繪制的路徑的高度中反轉應用-40
的位置:
path.lineTo(0.0, size.height);
path.quadraticBezierTo(size.width / 4, size.height - 40,
size.width / 2, size.height - 40);
path.quadraticBezierTo(size.width - (size.width / 4), size.height - 40,
size.width, size.height);
path.lineTo(size.width, 0.0);
path.close();
變化是
path.lineTo(0.0, size.height);
path.quadraticBezierTo(size.width / 4, size.height-40, size.width / 2, size.height-40);
path.quadraticBezierTo(size.width - (size.width / 4), size.height-40, size.width, size.height - 0);
path.lineTo(size.width, 0.0);
完整解決方案
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
final appTitle = 'Drawer Demo';
@override
Widget build(BuildContext context) {
return MaterialApp(
title: appTitle,
home: MyHomePage(title: appTitle),
);
}
}
class MyHomePage extends StatelessWidget {
final String title;
var scaffoldKey = GlobalKey<ScaffoldState>();
MyHomePage({Key key, this.title}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("THIS IS APP BAR"),),
body: Stack(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(bottom: 2.0),
child:ClipPath(
clipper: ClippingClass(),
child: Container(
width: MediaQuery
.of(context)
.size
.width,
height: 320.0,
decoration: BoxDecoration(
image: DecorationImage(
fit: BoxFit.cover,
image: NetworkImage(
"https://picsum.photos/250?image=9"))
),
),
),
),
],
),
);
}
}
class ClippingClass extends CustomClipper<Path> {
@override
Path getClip(Size size) {
var path = Path();
path.lineTo(0.0, size.height);
path.quadraticBezierTo(size.width / 4, size.height-40, size.width / 2, size.height-40);
path.quadraticBezierTo(size.width - (size.width / 4), size.height-40, size.width, size.height - 0);
path.lineTo(size.width, 0.0);
path.close();
return path;
}
@override
bool shouldReclip(CustomClipper<Path> oldClipper) => false;
}
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