如何在Flutter中裁剪图像？(How do I crop an image in Flutter?)
假设我有一个长方形的肖像图像：
我想裁剪它，使其呈现如下：
我如何在Flutter中做到这一点？
（我不需要调整图像大小。）
（图片来自https://flic.kr/p/nwXTDb ）
Let's say I have a rectangular, portrait image:
I'd like to crop it, such that it's rendered like this:
How can I do this in Flutter?
(I don't need to resize the image.)
(Image from https://flic.kr/p/nwXTDb)
最满意答案
我可能会使用带有DecorationImage的BoxDecoration 。 您可以使用alignment和fit属性来确定图像如何裁剪。 如果您不想在Container上硬编码高度，则可以使用AspectRatio小部件。
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(
home: new MyHomePage(),
));
}
class MyHomePage extends StatelessWidget {
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("Image Crop Example"),
),
body: new Center(
child: new AspectRatio(
aspectRatio: 487 / 451,
child: new Container(
decoration: new BoxDecoration(
image: new DecorationImage(
fit: BoxFit.fitWidth,
alignment: FractionalOffset.topCenter,
image: new NetworkImage('https://i.stack.imgur.com/lkd0a.png'),
)
),
),
),
),
);
}
}
I would probably use a BoxDecoration with a DecorationImage. You can use the alignment and fit properties to determine how your image is cropped. You can use an AspectRatio widget if you don't want to hard code a height on the Container.
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(
home: new MyHomePage(),
));
}
class MyHomePage extends StatelessWidget {
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("Image Crop Example"),
),
body: new Center(
child: new AspectRatio(
aspectRatio: 487 / 451,
child: new Container(
decoration: new BoxDecoration(
image: new DecorationImage(
fit: BoxFit.fitWidth,
alignment: FractionalOffset.topCenter,
image: new NetworkImage('https://i.stack.imgur.com/lkd0a.png'),
)
),
),
),
),
);
}
}
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