<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>九大行星</title>
</head>
<body>
<canvas height="1000" width="1000" id="canvas" style="background: black;">您的浏览器版本过低，不支持canvas标签</canvas>
<script type="text/javascript">
var canvas=document.getElementById("canvas");
var cxt=canvas.getContext("2d");
function drawTrack(){
for(var i=0;i<8;i++){
cxt.beginPath();
cxt.arc(500,500,50*(i+1),0,360,false);
cxt.closePath();
cxt.strokeStyle="#fff";
cxt.stroke();
}
}
drawTrack();
function Star(x,y,r,cycle,bColor,eColor){
this.x=x;
this.y=y;
this.r=r;
this.cycle=cycle;
this.time=0;
this.bColor=bColor;
this.eColor=eColor;
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.r,0,360,false);
cxt.closePath();
var color=cxt.createRadialGradient(this.x,this.y,0,this.x,this.y,this.r);
color.addColorStop(0,this.bColor);
color.addColorStop(1,this.eColor);
cxt.fillStyle=color;
cxt.fill();
cxt.restore();
this.time+=1;
}
}
function Sun(){
Star.call(this,0,0,20,0,"#FFFF00","#FF9900");
}
function Mercury(){
Star.call(this,0,-50,10,87.70,"#A69697","#5C3E40");
}
function Venus(){
Star.call(this,0,-100,10,224.701,"#C4BBAC","#1F1315");
}
function Earth(){
Star.call(this,0,-150,10,365.2422,"#78B1E8","#050C12");
}
function Mars(){
Star.call(this,0,-200,10,686.98,"#CEC9B6","#76422D");
}
function Jupiter(){
Star.call(this,0,-250,10,4332.589,"#C0A48E","#322222");
}
function Saturn(){
Star.call(this,0,-300,10,10759.5,"#F7F9E3","#5C4533");
}
function Uranus(){
Star.call(this,0,-350,10,30799.095,"#A7E1E5","#19243A");
}
function Neptune(){
Star.call(this,0,-400,10,60152,"#0661B2","#1E3B73");
}
var sun=new Sun();
var mercury=new Mercury();
var venus=new Venus();
var earth=new Earth();
var mars=new Mars();
var jupiter=new Jupiter();
var saturn=new Saturn();
var uranus=new Uranus();
var neptune=new Neptune();
function move(){
cxt.clearRect(0,0,1000,1000);
drawTrack();
sun.draw();
mercury.draw();
venus.draw();
earth.draw();
mars.draw();
jupiter.draw();
saturn.draw();
uranus.draw();
neptune.draw();
}
setInterval(move,10);
</script>
</body>
</html>
