Android 颤振:如何自下而上自定义剪辑图像?

Android 颤振:如何自下而上自定义剪辑图像?,android,ios,flutter,mobile,Android,Ios,Flutter,Mobile,我正在开发一个颤振项目,并试图剪辑图像。下面是我的代码 import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { final appTitle = 'Drawer Demo'; @override Widget build(BuildContext context) { return MaterialAp

我正在开发一个颤振项目,并试图剪辑图像。下面是我的代码

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;
}
导入“包装:颤振/材料.省道”;
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
最终appTitle=‘抽屉演示’;
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:appTitle,
主页:我的主页(标题:appTitle),
);
}
}
类MyHomePage扩展了无状态小部件{
最后的字符串标题;
var scaffoldKey=GlobalKey();
MyHomePage({Key,this.title}):超级(Key:Key);
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(标题:文本(“这是appBar”),),
主体:堆栈(
儿童:[
填充物(
填充:仅限常量边集(底部:2.0),
孩子:克利帕斯(
裁剪器:裁剪类(),
子:容器(
宽度:MediaQuery
.of(上下文)
.尺寸
.宽度,
高度:320.0,
装饰:盒子装饰(
图像:装饰图像(
适合:BoxFit.cover,
图片:NetworkImage(
"https://picsum.photos/250?image=9"))
),
),
),
),
],
),
);
}
}
类ClippingClass扩展了CustomClipper{
@凌驾
路径getClip(大小){
var path=path();
path.lineTo(0.0,大小。高度-40);
路径。方形贝塞尔托(尺寸。宽度/4,尺寸。高度,
尺寸。宽度/2,尺寸。高度);
路径。方形贝塞尔托(size.width-(size.width/4),size.height,
尺寸.宽度,尺寸.高度-40);
path.lineTo(size.width,0.0);
path.close();
返回路径;
}
@凌驾
bool shouldReclip(CustomClipper oldClipper)=>false;
}
下面是结果

然而,我的意图不是让曲线从下到上。相反,这里我有它从下到下

我需要的是以下内容(忽略这些行,它们是来自Adobe XD的指导行)


我如何才能做到这一点?

您只需在绘制的路径高度中反转应用
-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();

您只需在绘制的路径高度中反转应用
-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();
变化是

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);
全解

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;
}
导入“包装:颤振/材料.省道”;
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
最终appTitle=‘抽屉演示’;
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:appTitle,
主页:我的主页(标题:appTitle),
);
}
}
类MyHomePage扩展了无状态小部件{
最后的字符串标题;
var scaffoldKey=GlobalKey();
MyHomePage({Key,this.title}):超级(Key:Key);
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(标题:文本(“这是appBar”),),
主体:堆栈(
儿童:[
填充物(
填充:仅限常量边集(底部:2.0),
孩子:克利帕斯(
裁剪器:裁剪类(),
子:容器(
宽度:MediaQuery
.of(上下文)
.尺寸
.宽度,
高度:320.0,
装饰:盒子装饰(
图像:装饰图像(
适合:BoxFit.cover,
图片:NetworkImage(
"https://picsum.photos/250?image=9"))
),
),
),
),
],
),
);
}
}
类ClippingClass扩展了CustomClipper{
@凌驾
路径getClip(大小){
var path=path();
path.lineTo(0.0,大小.高度);
路径。方形贝塞尔托(size.width/4,size.height-40,size.width/2,size.height-40);
路径。方形贝塞尔托(size.width-(size.width/4),size.height-40,size.width,size.height-0);
path.lineTo(size.width,0.0);
path.close();
返回路径;
}
@凌驾
bool shouldReclip(CustomClipper oldClipper)=>false;
}
更改正在进行中

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);
全解

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;
}
导入“包装:颤振/材料.省道”;
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
最终appTitle=‘抽屉演示’;
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:appTitle,
主页:我的主页(标题:appTitle),
);
}
}
类MyHomePage扩展了无状态小部件{
最后的字符串标题;
var scaffoldKey=GlobalKey();
MyHomePage({Key,this.title}):超级(Key:Key);
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(标题:文本(“这是appBar”),),
主体:堆栈(
儿童:[
填充物(
填充:仅限常量边集(底部:2.0),
孩子:克利帕斯(
裁剪器:裁剪类(),
子:容器(
宽度:MediaQuery
.of(上下文)
.尺寸
.宽度,
高度:320.0,
装饰:盒子装饰(
图像:装饰图像(
适合:BoxFit.cover,
图片:NetworkImage(
"https://picsum.photos/250?image=9"))
),
),
),
),
],
),
);
}
}
类ClippingClass扩展了CustomClipper{
@凌驾
路径getClip(大小){
var path=path();
path.lineTo(0.0,大小.高度);
路径。方形贝塞尔托(size.width/4,size.height-40,size.width/2,size.height-40);
路径。方形贝塞尔托(size.width-(size.width/4),size.height-40,size.width,size.height-0);
路径