Flutter图片缩放插件nine_scaling_image的使用
Flutter图片缩放插件nine_scaling_image的使用
该插件允许用户在Flutter中使用九宫格缩放图像。
图像示例
开始使用
在pubspec.yaml
文件中添加nine_scaling_image
依赖:
dependencies:
nine_scaling_image: any
然后,在pubspec.yaml
中添加你的图片资源路径:
flutter:
assets:
- assets/sampleimage.png
接下来,导入包并使用NineScalingImage
类:
NineScalingImage img = NineScalingImage(assetPath: 'assets/sampleimage.png', pieceSize: const Size.square(5));
你可以设置以下参数:
-
assetPath
(必需)- 图片的路径。
-
pieceSize
(必需)- 九宫格分割块的大小。
-
centerColor
(可选)- 填充中心区域的颜色。
-
dstPieceScale
(可选)- 目标图像与源图像的比例。
-
child
(可选)- 九宫格对象中的子部件。
完整示例
import 'package:flutter/material.dart';
import 'package:nine_scaling_image/nine_scaling_image.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
title: 'Flutter Example',
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Flutter Plugin Example'),
),
body: Padding(
padding: const EdgeInsets.all(10),
child: Row(
children: [
Column(
children: [
const Text("Source Image \n 4x Scaled"),
SizedBox(
width: 120,
height: 120,
child: Stack(
fit: StackFit.expand,
children: [
Image.asset('assets/sampleimage.png', fit: BoxFit.contain,
isAntiAlias: false,
filterQuality: FilterQuality.none,),
const Align(
alignment: Alignment(-0.8, -0.8),
child: Text("piece 4x4", style: TextStyle(color: Colors.red),),
),
Align(
alignment: const Alignment(-1.0, -1.0),
child: Container(
width: 16,
height: 16,
decoration: BoxDecoration(
border: Border.all(color: Colors.red),
),
),
),
Align(
alignment: const Alignment(1.0, -1.0),
child: Container(
width: 16,
height: 16,
decoration: BoxDecoration(
border: Border.all(color: Colors.red),
),
),
),
Align(
alignment: const Alignment(1.0, 1.0),
child: Container(
width: 16,
height: 16,
decoration: BoxDecoration(
border: Border.all(color: Colors.red),
),
),
),
Align(
alignment: const Alignment(-1.0, 1.0),
child: Container(
width: 16,
height: 16,
decoration: BoxDecoration(
border: Border.all(color: Colors.red),
),
),
),
],
)
)
],
),
const Column(
children: [
Text("Nine Scaling Image \n (dstPieceScale: 1)"),
SizedBox(
width: 120,
height: 120,
child: NineScalingImage(assetPath: 'assets/sampleimage.png', pieceSize: Size.square(5),)
)
],
),
const Column(
children: [
Text("Nine Scaling Image \n (dstPieceScale: 4)"),
SizedBox(
width: 120,
height: 120,
child: NineScalingImage(assetPath: 'assets/sampleimage.png',
pieceSize: Size.square(5), dstPieceScale: 4,)
)
],
),
const Column(
children: [
Text("Nine Scaling Image \n (dstPieceScale: 8)"),
SizedBox(
width: 120,
height: 120,
child: NineScalingImage(assetPath: 'assets/sampleimage.png',
pieceSize: Size.square(5), dstPieceScale: 8,)
)
],
),
const Column(
children: [
Text("Nine Scaling Image \n with child text widget"),
SizedBox(
width: 120,
height: 120,
child: NineScalingImage(assetPath: 'assets/sampleimage.png',
pieceSize: Size.square(5), child: Text("child text"),)
)
],
),
Column(
children: [
const Text("Nine Scaling Image \n with child Container widget"),
SizedBox(
width: 120,
height: 120,
child: NineScalingImage(assetPath: 'assets/sampleimage.png',
pieceSize: Size.square(5), child: Container(
color: Colors.red,
),)
)
],
),
const Column(
children: [
Text("Nine Scaling Image \n with centerColor"),
SizedBox(
width: 120,
height: 120,
child: NineScalingImage(assetPath: 'assets/sampleimage.png',
pieceSize: Size.square(5),
centerColor: Colors.red,
)
)
],
)
]
)
)
);
}
}
更多关于Flutter图片缩放插件nine_scaling_image的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter图片缩放插件nine_scaling_image的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
nine_scaling_image
是一个用于 Flutter 的图片缩放插件,它允许你在应用中实现类似于 Android 中的 NinePatch
图片缩放效果。NinePatch
是一种特殊的 PNG 图片格式,它定义了图片的可拉伸区域和内容区域,使得图片在缩放时能够保持特定的部分不变形。
安装 nine_scaling_image
插件
首先,你需要在 pubspec.yaml
文件中添加 nine_scaling_image
插件的依赖:
dependencies:
flutter:
sdk: flutter
nine_scaling_image: ^1.0.0 # 请检查最新版本
然后,运行 flutter pub get
来安装依赖。
使用 nine_scaling_image
以下是一个简单的示例,展示了如何使用 nine_scaling_image
插件来加载和缩放一个 NinePatch
图片。
import 'package:flutter/material.dart';
import 'package:nine_scaling_image/nine_scaling_image.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Nine Scaling Image Example'),
),
body: Center(
child: NineScalingImage(
image: AssetImage('assets/example.9.png'), // 你的 NinePatch 图片路径
width: 200.0, // 设置图片宽度
height: 100.0, // 设置图片高度
),
),
),
);
}
}