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[网页设计]canvas仿黑客帝国的字符下落


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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>二进制雨</title>
</head>
<body>
<div style="color:red;text-align: center;font-size: 20px;">二进制雨</div>
<canvas id="myCanvas" width="1000px" height="600px" style="background-color: black;"></canvas>
<script>
  
    var draw=function(ctx,x,y,size){
        this.ctx=ctx;
        this.x=x;
        this.y=y;
        this.size=size;
        var y1=this.y;
        this.drawText=function(){
            var str=Math.ceil(Math.random()*10000).toString(2);
            var grd=this.ctx.createLinearGradient(this.x,this.y,this.x,this.y-this.ctx.measureText(str).width);
            grd.addColorStop(0,"#00FF00");
            grd.addColorStop(1,"#004400");
            this.ctx.fillStyle=grd;
            this.ctx.font=this.size+"px Arial";
            for(var i=str.length-1;i>=0;i--) {
                this.ctx.fillText(str.charAt(i), this.x, y1-=15);
            }
            y1=this.y+=10;
            if(y1-720+this.ctx.measureText(str).width>0){
                this.x=Math.ceil(Math.random()*1000);
                y1=this.y=Math.ceil(Math.random()*100);
            }
        }
    };
  
    var rain=function(ctx,length){
        this.length=length;
        this.ctx=ctx;
        var x=[];
        var y=[];
        var size=[];
        var texts=[];
        var i=0;
        for(;i<length;i++){
            x[i]=Math.ceil(Math.random()*1000);
            y[i]=Math.ceil(Math.random()*500);
            size[i]=Math.ceil(Math.random()*15);
            texts[i]=new draw(this.ctx,x[i],y[i],size[i]);
        }
        this.run=function(){
            ctx.clearRect(0,0,1000,600);
            for(var j=0;j<length;j++){
                texts[j].drawText();
            }
        };
  
    };
  
    var canvas=document.getElementById("myCanvas");
    var ctx=canvas.getContext("2d");
    var rain0=new rain(ctx,100);
    setInterval(rain0.run,50);
  
</script>
</body>
</html>
    

 


这是以前的博客 效果还行吧。手机看不了 看了也卡。。。。http://blog.chinaunix.net/uid-30494608-id-5201548.html