非常不错的canvas效果，线随心动

非常不错的canvas效果，下面是html代码。
 <!DOCTYPE html>

 <html>

  <head>

   <meta charset="utf-8" />

   <meta name="author" content="" />

   <meta name="keywords" content="" />

   <meta name="description" content="" />

   <meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no" />

   <title>  似圆非圆，似线非线 </title>

   <style>

     .stage{position:absolute;left:0;top:0;width:100%;height:100%;background:#000;}

   </style>

  </head>

  <body>

   <canvas class="stage"></canvas>

   <script>

     (function(win,el){

         var cvs=document.querySelector(el),

             ctx=cvs.getContext("2d"),

             width,

             height,

             mouse={},

             scale=1,

             min_scale=1,

             max_scale=2.5,

             isMouseDown=false,

             radius=50,

             circlesNum=10,

             circles=[];

             Function.prototype.method=function(k,v){

                return this.prototype[k]=v,this;

             };

             function Circle(x,y,center,radius){

                this.x=x;

                this.y=y;

                this.curX=x;

                this.curY=y;

                this.center=center;

                this.speed=0.01+Math.random()*0.04;

                this.angle=0;

                this.color="hsl("+Math.random()*360+",100%,50%)";

                this.lineWidth=1;

                this.targetWidth=5;

                this.radius=radius;

             }

             Circle.method("draw",function(ctx,zoom){

                 var x=this.x,y=this.y;

                 this.angle+=this.speed;

                 this.curX+=(this.center.x-this.curX)*this.speed;

                 this.curY+=(this.center.y-this.curY)*this.speed;

                 this.x=this.curX+Math.cos(this.angle)*this.radius*zoom;

                 this.y=this.curY+Math.sin(this.angle)*this.radius*zoom;

                 this.lineWidth+=(this.targetWidth-this.lineWidth)*0.05;

                 if(Math.abs(this.targetWidth-this.lineWidth)<0.5)

                 {

                    this.targetWidth=1+Math.random()*6;

                 }

                 ctx.strokeStyle=this.color;

                 ctx.lineWidth=this.lineWidth;

                 ctx.beginPath();

                 ctx.moveTo(x,y)

                 ctx.lineTo(this.x,this.y);

                 ctx.stroke();

             });

             function init(){

                 var bound=cvs.getBoundingClientRect(),i=circlesNum,segment=i*10;

                 cvs.width=width=bound.width;

                 cvs.height=height=bound.height;

                 ctx.fillStyle="rgba(0,0,0,.05)";

                 ctx.lineCap="round";

                 mouse.x=width/2;

                 mouse.y=height/2;

                 while(i--)

                   circles[i]=new Circle(0,0,mouse,radius+Math.random()*segment);

                 cvs.addEventListener("mousemove",function(e){

                     mouse.x=e.clientX;

                     mouse.y=e.clientY;

                 },false);

                 cvs.addEventListener("mousedown",function(){

                     isMouseDown=true;

                 },false);

                 cvs.addEventListener("mouseup",function(){

                     isMouseDown=false;

                 },false);

                 cvs.addEventListener("mouseout",function(){

                     isMouseDown=false;

                 },false);

                 render();

             }

             function render(){

               var i=circlesNum;

               scale+=isMouseDown?(max_scale-scale)*0.05:(min_scale-scale)*0.05;

               ctx.fillRect(0,0,width,height);

               while(i--)

                  circles[i].draw(ctx,scale);

               requestAnimationFrame(render);

             }

             init();

     })(this,".stage");

   </script>

  </body>

 </html>
巴特西

非常不错的canvas效果，线随心动

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