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星球 變量名 公轉周期 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" style="background-color: #000;"></canvas>

代碼如下:

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){

//畫出星球需要哪些屬性

//星球的坐標點

this.x=x;

this.y=y;

//星球的半徑

this.radius=radius;

//星球的顏色(開始色,結束色)

this.sColor=sColor;

this.eColor=eColor;

//創建一個漸變色空對象

this.color=null;

this.time=0;

//公共周期

this.cycle=cycle;

this.draw=function(){

cxt.save();

cxt.translate(500,500);

//設置旋轉角度

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(){//太陽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);

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