html5使用canvas绘制太阳系效果

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" style="background-color: #000;"></canvas>

复制代码

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);