Flutter特效绘制插件neonpen的使用
Flutter特效绘制插件neonpen的使用
Neonpen
一个用于在文本上添加霓虹笔效果的Flutter插件。该插件提供了颜色、透明度、锯齿、双层等选项。
安装
在你的pubspec.yaml文件中添加以下依赖：
dependencies:
neonpen: ^2.0.5
然后在你的Dart文件中导入该库：
import 'package:neonpen/neonpen.dart';
如何使用
通过简单的添加带有必要参数的Neonpen小部件来使用该插件。以下是一个完整的示例代码：
import 'package:flutter/material.dart';
import 'package:neonpen/neonpen.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
[@override](/user/override)
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Neonpen(
text: Text(
'Hello World!',
style: TextStyle(
fontSize: 15,
),
),
color: Colors.red,
opacity: 0.3,
emphasisWidth: 5,
emphasisOpacity: 0.3,
emphasisAngleDegree: 0.5,
enableLineZiggle: true,
lineZiggleLevel: 0,
isDoubleLayer: false,
),
SizedBox(height: 30),
Neonpen(
text: Text(
'Hello World!',
style: TextStyle(
fontSize: 15,
),
),
color: Colors.yellow,
padding: EdgeInsets.symmetric(vertical: 5, horizontal: 15),
opacity: 0.3,
disableEmphasis: true,
lineZiggleLevel: 1,
isDoubleLayer: false,
),
SizedBox(height: 30),
Neonpen(
text: Text(
'Hello World!',
style: TextStyle(
fontSize: 15,
),
),
color: Colors.orange,
padding: EdgeInsets.only(
top: -10,
left: 5,
right: 5,
),
opacity: 0.3,
disableEmphasis: true,
enableLineZiggle: true,
lineZiggleLevel: 1,
isDoubleLayer: false,
),
SizedBox(height: 30),
Neonpen(
text: Text(
'Hello World!',
style: TextStyle(
fontSize: 15,
),
),
color: Colors.grey,
padding: EdgeInsets.symmetric(vertical: 5, horizontal: 15),
opacity: 0.7,
emphasisWidth: 5,
emphasisOpacity: 0.5,
emphasisAngleDegree: 0.5,
enableLineZiggle: true,
lineZiggleLevel: 1,
isDoubleLayer: false,
),
SizedBox(height: 30),
Neonpen(
text: Text(
'Hello World!',
style: TextStyle(
fontSize: 15,
),
),
color: Colors.blue,
padding: EdgeInsets.symmetric(vertical: 5, horizontal: 15),
opacity: 0.3,
emphasisWidth: 15,
emphasisOpacity: 0.3,
emphasisAngleDegree: 2,
enableLineZiggle: true,
lineZiggleLevel: 1,
isDoubleLayer: false,
),
SizedBox(height: 30),
Neonpen(
text: Text(
'Hello World!',
style: TextStyle(
fontSize: 15,
),
),
color: Colors.purple,
padding: EdgeInsets.symmetric(vertical: 5, horizontal: 15),
opacity: 0.3,
emphasisWidth: 10,
emphasisOpacity: 0.3,
emphasisAngleDegree: 2,
enableLineZiggle: true,
lineZiggleLevel: 2,
isDoubleLayer: false,
),
SizedBox(height: 30),
Neonpen(
text: Text(
'Hello World!',
style: TextStyle(
fontSize: 15,
),
),
color: Colors.green,
padding: EdgeInsets.symmetric(vertical: 5, horizontal: 20),
opacity: 0.3,
emphasisWidth: 5,
emphasisOpacity: 0.3,
emphasisAngleDegree: 0.5,
enableLineZiggle: true,
lineZiggleLevel: 1,
isDoubleLayer: true,
),
SizedBox(height: 30),
Neonpen(
text: Text(
'Hello World!',
style: TextStyle(
fontSize: 15,
),
),
color: Colors.lime,
padding: EdgeInsets.symmetric(vertical: 5, horizontal: 20),
opacity: 0.3,
emphasisWidth: 5,
emphasisOpacity: 0.3,
emphasisAngleDegree: 2,
enableLineZiggle: true,
lineZiggleLevel: 1,
isDoubleLayer: true,
),
SizedBox(height: 30),
Neonpen(
text: Text(
'Hello World!',
style: TextStyle(
fontSize: 15,
),
),
color: Colors.amber,
padding: EdgeInsets.symmetric(vertical: 10, horizontal: 25),
opacity: 0.3,
emphasisWidth: 5,
emphasisOpacity: 0.3,
emphasisAngleDegree: 0.5,
enableLineZiggle: true,
lineZiggleLevel: 1,
isDoubleLayer: true,
),
SizedBox(height: 30),
Neonpen(
text: Text(
'Hello World!',
style: TextStyle(
fontSize: 15,
),
),
color: Colors.indigo,
padding: EdgeInsets.symmetric(vertical: 10, horizontal: 25),
opacity: 0.3,
emphasisWidth: 8,
emphasisOpacity: 0.1,
emphasisAngleDegree: 0.8,
enableLineZiggle: true,
lineZiggleLevel: 1,
isDoubleLayer: true,
),
SizedBox(height: 30),
],
),
),
);
}
}
更多关于Flutter特效绘制插件neonpen的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
1 回复
更多关于Flutter特效绘制插件neonpen的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然，以下是如何在Flutter中使用neonpen插件进行特效绘制的代码示例。neonpen是一个用于绘制具有霓虹效果的图形的Flutter插件。假设你已经在pubspec.yaml文件中添加了neonpen依赖，并运行了flutter pub get来安装它。
首先，确保你的pubspec.yaml包含以下依赖：
dependencies:
flutter:
sdk: flutter
neonpen: ^最新版本号 # 请替换为实际的最新版本号
接下来，以下是一个简单的示例，展示如何使用neonpen绘制具有霓虹效果的图形：
import 'package:flutter/material.dart';
import 'package:neonpen/neonpen.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('NeonPen Example'),
),
body: Center(
child: NeonDrawingBoard(
onDraw: _onDraw,
neonStyle: NeonStyle(
color: Colors.cyanAccent,
strokeWidth: 5.0,
),
),
),
),
);
}
void _onDraw(Canvas canvas, Size size) {
final Paint paint = Paint()
..color = Colors.transparent
..style = PaintingStyle.stroke
..strokeWidth = 5.0;
// 创建一个路径
Path path = Path();
path.moveTo(size.width * 0.1, size.height * 0.5);
path.lineTo(size.width * 0.5, size.height * 0.1);
path.lineTo(size.width * 0.9, size.height * 0.5);
path.lineTo(size.width * 0.5, size.height * 0.9);
path.close();
// 使用NeonPen绘制路径
NeonPen.drawPath(
canvas: canvas,
path: path,
neonStyle: NeonStyle(
color: Colors.lightBlueAccent,
strokeWidth: 5.0,
blurRadius: 10.0,
spreadRadius: 5.0,
),
);
}
}
在这个示例中，我们创建了一个简单的Flutter应用，其中包含一个自定义的NeonDrawingBoard。这个自定义组件允许我们通过onDraw回调在画布上绘制内容。
在_onDraw方法中，我们创建了一个简单的路径（一个菱形），并使用NeonPen.drawPath方法将其绘制到画布上。NeonStyle类允许我们自定义霓虹效果的颜色、笔触宽度、模糊半径和扩展半径。
请注意，NeonPen是一个假设的插件名称，实际上可能不存在一个名为neonpen的官方Flutter插件。不过，基于类似的插件或自定义绘制逻辑，上述代码示例提供了一个如何使用Flutter绘制具有霓虹效果的图形的基本思路。如果你确实找到一个名为neonpen的插件，并希望使用它，请参考该插件的官方文档进行适配。
如果没有一个现成的neonpen插件，你可以考虑使用CustomPainter和ShaderMask等Flutter提供的绘制工具来实现类似的霓虹效果。
