js使用canvas实现黑客帝国二进制雨

来源：互联网发布：人群密度检测算法编辑：程序博客网时间：2024/05/22 12:00

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>黑客帝国二进制雨</title></head><body align="center"><h2>黑客帝国二进制雨</h2><canvas id="myCanvas" width="480px" height="320px" style="background-color: black;"></canvas></body></html><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);// 100控制密度    setInterval(rain0.run,50);</script>

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js使用canvas实现 黑客帝国二进制雨

js使用canvas实现黑客帝国二进制雨