HTML5 Canvas CSS3模拟实现旋转的太阳系动画，相当牛叉我觉得，以前有一个是CSS3写的，各这个差不多，有兴趣在本站搜索“CSS3太阳系星球效果图”，各个星球围着太阳旋转，速度不一样，有运动轨迹线，学习Canvas动画的好范例。
<!doctype html>
<html>
<head>
<title>html5旋转的太阳系动画</title>
<meta charset="utf-8">
</head>
<body>
<canvas id="canvas" width="1000" height="1000" style="background:#000"> </canvas>
<script>
var cxt=document.getElementById('canvas').getContext('2d')
function draw(){
for(var i=0;i<8;i++){
cxt.beginPath();
cxt.strokeStyle="gray";
cxt.closePath();
cxt.arc(500,500,(i+1)*50,0,360,false);
cxt.closePath();
cxt.stroke();
}
}
draw();
function Star(x,y,radius,cycle,scolor,ecolor){
this.x=x;
this.y=y;
this.radius=radius;
this.cycle=cycle;
this.scolor=scolor;
this.ecolor=ecolor;
this.color=null;
this.time=0;
this.draw=function(){
cxt.save();
cxt.translate(500,500);
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;
}
}
function Sun(){
Star.call(this,0,0,20,0,"#ff0000","#ff9900");
}
var sun=new Sun();
function di(){
Star.call(this,0,-50,10,87,"#A69697","#5C3E40");
}
var di=new di();
function water(){
Star.call(this,0,-100,10,224.701,"#C4BBAC","#1F1315");
}
var water=new water();
function jin(){
Star.call(this,0,-150,10,365.2422,"#78B1E8","#050C12");
}
var jin=new jin();
function huo(){
Star.call(this,0,-200,10,686.98,"#CEC9B6","#76422D");
}
var huo=new huo();
function mu(){
Star.call(this,0,-250,10,4332.589,"#C0A48E","#322222");
}
var mu=new mu();
function tu(){
Star.call(this,0,-300,10,10759.5,"#F7F9E3","#5C4533");
}
var tu=new tu();
function hai(){
Star.call(this,0,-350,10,30799.095,"#A7E1E5","#19243A");
}
var hai=new hai();
function ming(){
Star.call(this,0,-400,10,164.8*365,"#0661B2","#1E3B73");
}
var ming=new ming();
function move(){
cxt.clearRect(0,0,1000,1000)
draw();
ming.draw();
sun.draw();
di.draw();
water.draw();
jin.draw();
huo.draw();
mu.draw();
tu.draw();
hai.draw();
}
setInterval(move,10);
</script>
</body>
</html>
未经允许不得转载：蒋丽君的小站 » html5旋转的太阳系动画
