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          波浪紋的交互，css的animation
          
        
           
          
	
	
          
		波浪紋的交互，css的animation
          
                        

          碼
          //html code
<div class="ripple" title="謝謝點贊~~">
   <span>2021</span>
</div>
          樣式
          因
          缺少@types/node模塊所致。該模塊用于提供Node.js類型定義的模塊，使開發者在編寫Node.js代碼時獲得更好的代碼補全和類型檢查支持。
          解決方案1
          開啟Node.js編碼協助
          如果報錯無法下載 @types/node No @types/node versions available，可用方案2或3。
          解決方案2
          全局安裝 @types/node 包：
          npm install @types/node -g
          在 Windows 系統中，全局安裝的 node_modules 目錄路徑通常位于 C:\Users\{用戶名}\AppData\Roaming\npm\node_modules。
          在Webstorm點擊設置，選擇語言和框架->JavaScript->庫，指定文件夾為C:\Users\Administrator\AppData\Roaming\npm\node_modules\@types。
          解決方案3
          在項目中局部安裝@types/node模塊：
          npm install @types/node --save-dev
          迎去瀏覽原文：http://tryenough.com/flutter-wave
          效果


          你可以先簡單理解下貝塞爾曲線的原理：
          推薦這個關于貝塞爾的教程：http://www.html-js.com/article/1628
          代碼：
          1.創建繪制波浪邊界的代碼
          創建一個基礎的繪制類，可接收動畫的x和y值：
          import 'package:flutter/material.dart';
abstract class BasePainter extends CustomPainter{
 Animation<double> _xAnimation;
 Animation<double> _yAnimation;
 set XAnimation(Animation<double> value) {
 _xAnimation=value;
 }
 set YAnimation(Animation<double> value) {
 _yAnimation=value;
 }
 Animation<double> get YAnimation=> _yAnimation;
 Animation<double> get XAnimation=> _xAnimation;
}

          實現
          歡迎去瀏覽原文：http://tryenough.com/flutter-wave
          import 'dart:math';
import 'package:flutter_wave/painter_base.dart';
import 'package:flutter/material.dart';
class WavePainter extends BasePainter {
 int waveCount;
 int crestCount;
 double waveHeight;
 List<Color> waveColors;
 double circleWidth;
 Color circleColor;
 Color circleBackgroundColor;
 bool showProgressText;
 TextStyle textStyle;
 WavePainter(
 {this.waveCount=1,
 this.crestCount=2,
 this.waveHeight,
 this.waveColors,
 this.circleColor=Colors.grey,
 this.circleBackgroundColor=Colors.white,
 this.circleWidth=5.0,
 this.showProgressText=true,
 this.textStyle=const TextStyle(
 fontSize: 60.0,
 color: Colors.blue,
 fontWeight: FontWeight.bold,
 shadows: [
 Shadow(color: Colors.grey, offset: Offset(5.0, 5.0), blurRadius: 5.0)
 ],
 )});
 @override
 void paint(Canvas canvas, Size size) {
 double width=size.width;
 double height=size.height;
 if (waveHeight==null) {
 waveHeight=height / 10;
 height=height + waveHeight;
 }
 if (waveColors==null) {
 waveColors=[
 Color.fromARGB(
 100, Colors.blue.red, Colors.blue.green, Colors.blue.blue)
 ];
 }
 Offset center=new Offset(width / 2, height / 2);
 double xMove=width * XAnimation.value;
 double yAnimValue=0.0;
 if (YAnimation !=null) {
 yAnimValue=YAnimation.value;
 }
 double yMove=height * (1.0 - yAnimValue);
 Offset waveCenter=new Offset(xMove, yMove);
 var paintCircle=new Paint()
 ..color=Colors.grey
 ..style=PaintingStyle.fill
 ..strokeWidth=circleWidth
 ..maskFilter=MaskFilter.blur(BlurStyle.inner, 5.0);
// canvas.drawCircle(center, min(width, height) / 2, paintCircle);
 List<Path> wavePaths=[];
 for (int index=0; index < waveCount; index++) {
 double direction=pow(-1.0, index);
 Path path=new Path()
 ..moveTo(waveCenter.dx - width, waveCenter.dy)
 ..lineTo(waveCenter.dx - width, center.dy + height / 2)
 ..lineTo(waveCenter.dx + width, center.dy + height / 2)
 ..lineTo(waveCenter.dx + width, waveCenter.dy);
 for (int i=0; i < 2; i++) {
 for (int j=0; j < crestCount; j++) {
 double a=pow(-1.0, j);
 path
 ..quadraticBezierTo(
 waveCenter.dx +
 width * (1 - i - (1 + 2 * j) / (2 * crestCount)),
 waveCenter.dy + waveHeight * a * direction,
 waveCenter.dx +
 width * (1 - i - (2 + 2 * j) / (2 * crestCount)),
 waveCenter.dy);
 }
 }
 path..close();
 wavePaths.add(path);
 }
 var paint=new Paint()
 ..color=circleBackgroundColor
 ..style=PaintingStyle.fill
 ..maskFilter=MaskFilter.blur(BlurStyle.inner, 5.0);
 canvas.saveLayer(
 Rect.fromCircle(center: center, radius: min(width, height) / 2), paint);
// canvas.drawCircle(center, min(width, height) / 2, paint);
 paint
// ..blendMode=BlendMode.srcATop
 ..style=PaintingStyle.fill
 ..strokeWidth=2.0
 ..maskFilter=MaskFilter.blur(BlurStyle.inner, 10.0);
 for (int i=0; i < wavePaths.length; i++) {
 if (waveColors.length >=wavePaths.length) {
 paint.color=waveColors[i];
 } else {
 paint.color=waveColors[0];
 }
 canvas.drawPath(wavePaths[i], paint);
 }
// paint.blendMode=BlendMode.srcATop;
 if (showProgressText) {
 TextPainter tp=TextPainter(
 text: TextSpan(
 text: '${(yAnimValue * 100.0).toStringAsFixed(0)}%',
 style: textStyle),
 textDirection: TextDirection.rtl)
 ..layout();
 tp.paint(
 canvas, Offset(center.dx - tp.width / 2, center.dy - tp.height / 2));
 }
 canvas.restore();
 }
 @override
 bool shouldRepaint(CustomPainter oldDelegate) {
 return oldDelegate !=this;
 }
}

          歡迎去瀏覽原文：http://tryenough.com/flutter-wave
          2.創建工廠方法，用于創建波浪圖形
          import 'package:flutter/material.dart';
          import 'package:flutter_wave/painter_base.dart';
          import 'package:flutter_wave/painter/painter_wave.dart';
          abstract class BasePainterFactory {
           BasePainter getPainter();
          }
          class WavePainterFactory extends BasePainterFactory {
           BasePainter getPainter() {
           return WavePainter(
           waveCount: 1,
           waveColors: [
           Colors.lightBlueAccent[200],
           ],
           textStyle:
           TextStyle(
           fontSize: 60.0,
           foreground: Paint()
           ..color=Colors.lightBlue
           ..style=PaintingStyle.fill
           ..strokeWidth=2.0
           ..blendMode=BlendMode.difference
           ..colorFilter=ColorFilter.mode(Colors.white, BlendMode.exclusion)
           ..maskFilter=MaskFilter.blur(BlurStyle.solid, 1.0),
           fontWeight: FontWeight.bold,
           ),
           );
           }
          }
          給波浪添加動畫
          推薦你先學一下動畫基礎知識：
          https://juejin.im/post/5b6270edf265da0f473539a6
          原理解釋：
          xAnimation和yAnimation不斷的從0到1變化，然后上面繪制波浪的地方根據這些值不斷的進行繪制，形成動畫。
          import 'package:flutter_wave/painter_factory.dart';
import 'package:flutter/material.dart';
class ProgressManager extends StatefulWidget {
 @override
 _ProgressManagerState createState()=>
 new _ProgressManagerState().._factory=WavePainterFactory();
}
class _ProgressManagerState extends State<ProgressManager>
 with TickerProviderStateMixin {
 AnimationController xController;
 AnimationController yController;
 Animation<double> xAnimation;
 Animation<double> yAnimation;
 List<double> _progressList=[];
 double curProgress=0;
 BasePainterFactory _factory;
 set painter(BasePainterFactory factory) {
 _factory=factory;
 }
 setProgress(double progress) {
 _progressList.add(progress);
 onProgressChange();
 }
 onProgressChange() {
 if (_progressList.length > 0) {
 if (yController !=null && yController.isAnimating) {
 return;
 }
 double nextProgress=_progressList[0];
 _progressList.removeAt(0);
 final double begin=curProgress;
 yController=new AnimationController(
 vsync: this, duration: Duration(milliseconds: 1000));
 yAnimation=new Tween(begin: begin, end: nextProgress).animate(yController);
 yAnimation.addListener(_onProgressChange);
 yAnimation.addStatusListener(_onProgressStatusChange);
 yController.forward();
 }
 }
 @override
 void initState() {
 super.initState();
 xController=new AnimationController(
 vsync: this, duration: Duration(milliseconds: 4000));
 xAnimation=new Tween(begin: 0.0, end: 1.0).animate(xController);
 xAnimation.addListener(_change);
 yController=new AnimationController(
 vsync: this, duration: Duration(milliseconds: 5000));
 yAnimation=new Tween(begin: 0.0, end: 1.0).animate(yController);
 yAnimation.addListener(_onProgressChange);
 yAnimation.addStatusListener(_onProgressStatusChange);
 doDelay(xController, 0);
 Future.delayed(Duration(milliseconds: 3000), () {
 setProgress(0.66);
 });
 }
 @override
 Widget build(BuildContext context) {
 return Center(
 child:
 Container(
 width: MediaQuery.of(context).size.width,
 height: 400.0,
 child: new CustomPaint(
 painter: _factory.getPainter()
 ..XAnimation=xAnimation
 ..YAnimation=yAnimation,
 size: new Size(MediaQuery.of(context).size.width, 400.0),
 ),
 ),
 );
 }
 void _change() {
 setState(() {});
 }
 void _onProgressChange() {
 setState(() {
 curProgress=yAnimation.value;
 });
 }
 void _onProgressStatusChange(status) {
 if (status==AnimationStatus.completed) {
 onProgressChange();
 }
 }
 void doDelay(AnimationController controller, int delay) async {
 Future.delayed(Duration(milliseconds: delay), () {
 controller..repeat();
 });
 }
 @override
 void dispose() {
 xController.dispose();
 yController.dispose();
 xAnimation.removeListener(_change);
 yAnimation.removeListener(_onProgressChange);
 yAnimation.removeStatusListener(_onProgressStatusChange);
 super.dispose();
 }
}

          使用的地方
          body: Center(
 child: Column(
 mainAxisAlignment: MainAxisAlignment.center,
 children: <Widget>[
 ProgressManager(),
 ],
 ),
 ),

          歡迎去瀏覽原文：http://tryenough.com/flutter-wave
          下載demo地址
          http://tryenough.com/flutter-wave
                              	
          
	
	

          

          

 
          
        
        
		  
      
          
      
      
          
    
          
  
          

          



 


			
		





          
  
          
    
  
          

          

          
	
          
		
		
		
          
	
          


          
 

 







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