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星球變量名公轉(zhuǎn)周期光色暗色

水星mercury87.70#a69697#5c3e40

金星venus224.701.70#c4bbac#1f1315

地球earth365.2422#78b1e8#050c12

火星mars686.98#cec9b6#76422d

木星jupiter4332.589#c0a48e#322

土星saturn10759.95#f7f9e3#5c4553

天王星uranus30799.095#a7e115#19243a

海王星neptune60152.95#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(biāo)點(diǎn)

this.x=x;

this.y=y;

//星球的半徑

this.radius=radius;

//星球的顏色(開始色,結(jié)束色)

this.scolor=scolor;

this.ecolor=ecolor;

//創(chuàng)建一個(gè)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(shè)置旋轉(zhuǎn)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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