html5如何使用canvas绘制太阳系效果

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代码如下:

 var canvas=document.getElementById("canvas");
    var cxt=canvas.getContext("2d");
 
    function DrawTrack(){
        for(var i=0;i<8;i++){
            cxt.beginPath();
            cxt.arc(500,500,(i+1)*50,0,360,false);
            cxt.closePath();
            cxt.strokeStyle="#fff";
            cxt.stroke();
        }
    }
    function DrawStart(x,y,radius,cycle,sColor,eColor){
        //画出星球需要哪些属性

        //星球的坐标点
        this.x=x;
        this.y=y;
        //星球的半径
        this.radius=radius;
        //星球的颜色(开始色,结束色)
        this.sColor=sColor;
        this.eColor=eColor;
        //创建一个渐变色空对象
        this.color=null;
        this.time=0;
        //公共周期
        this.cycle=cycle;
        this.draw=function(){
            cxt.save();
            cxt.translate(500,500);
            //设置旋转角度
            cxt.rotate(this.time*360/this.cycle*Math.PI/180);
            cxt.beginPath();
            cxt.arc(this.x,this.y,this.radius,0,360,false);
            cxt.closePath();
            this.color=cxt.createRadialGradient(this.x,this.y,0,this.x,this.y,this.radius);
            this.color.addColorStop(0,this.sColor);
            this.color.addColorStop(1,this.eColor);
            cxt.fillStyle=this.color;
            cxt.fill();
            cxt.restore();
            this.time+=1;
        }
    }
 
     function Sun(){//太阳1
        DrawStart.call(this,0,0,20,0,"#f00","#f90");
    }
    function Mercury(){//水星2
        DrawStart.call(this,0,-50,10,87.70,"#A69697","#5c3e40");
    }
    function Venus(){//金星3
        DrawStart.call(this,0,-100,10,224.71,"#c4bbac","#1f1315");
    }
    function Earth(){//地球4
        DrawStart.call(this,0,-150,10,365.224,"#78b1e8","#050c12");
    }
    function Mars(){//火星5
        DrawStart.call(this,0,-200,10,686.98,"#cec9b6","#76422d");
    }
    function Jupiter(){//木星6
        DrawStart.call(this,0,-250,10,4332.589,"#c0a48e","#322");
    }
    function Saturn(){//土星7
        DrawStart.call(this,0,-300,10,10759.5,"#f7f9e3","#5c4533");
    }
    function Uranus(){//天王星8
        DrawStart.call(this,0,-350,10,30799.95,"#a7e1e5","#19243a");
    }
    function Neptune(){//天王星9
        DrawStart.call(this,0,-400,10,60152.95,"#0661b2","#1E3b73");
    }

    var s=new Sun();//1

    var m=new Mercury();//2
    var v=new Venus();//3
    var e=new Earth();//4
    var ma=new Mars();//5
    var j=new Jupiter();//6
    var sa=new Saturn();//7
    var ur=new Uranus();//8
    var ne=new Neptune();//9

setInterval(function(){
    cxt.clearRect(0,0,1000,1000);
    DrawTrack();
    s.draw();
    m.draw();
    v.draw();
    e.draw();
    ma.draw();
    j.draw();
    sa.draw();
    ur.draw();
    ne.draw();
},10);

效果：

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