canvas id= canvas width= 1000 height= 1000 > 復制代碼代碼如下: var canvas=document.getElementById("canvas"); var cxt=canvas.getContext("2d");
function DrawTrack(){ for(var i=0;i i++){ cxt.beginPath(); cxt.arc(500,500,(i+1)*50,0,360,false); cxt.closePath(); cxt.stroke ; 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.fill > 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
