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标题 html5使用canvas绘制太阳系效果
范文
    星球 变量名 公转周期 光色 暗色
    水星 Mercury 87.70 #a69697 #5c3e40
    金星 Venus 224.701.70 #c4bbac #1f1315
    地球 Earth 365.2422 #78b1e8 #050c12
    火星 Mars 686.98 #cec9b6 #76422d
    木星 Jupiter 4332.589 #c0a48e #322
    土星 Saturn 10759.95 #f7f9e3 #5c4553
    天王星 Uranus 30799.095 #a7e115 #19243a
    海王星 Neptune 60152.95 #0661b2 #1E3b73
    <canvas id="canvas" width="1000" height="1000"></canvas>
    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;
    }
    }</p> <p> 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);
    名单
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更新时间:2025/5/12 19:17:40