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雪饮的学习笔记-canvas实例2-太阳系2
发布时间：2015-06-03 23:57:13编辑：雪饮阅读（）
案例预览：
源码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<body>
<canvas id="canvas" width="1000" height="1000" style="background:#000;">
您的浏览器不支持canvas标签
</canvas>
<script>
//设置2d绘图环境
var cxt=document.getElementById("canvas").getContext('2d');
//轨道
function drawTrack(){
for(var i=0;i<8;i++){
cxt.beginPath();
cxt.arc(500,500,(i+1)*50,0,360,false);
cxt.strokeStyle="#fff";
cxt.stroke();
cxt.closePath();
}
}
//drawTrack();
//星球
function Star(x,y,radius,cycle,sColor,eColor){
//画出星球所需要的属性
//星球的坐标点
this.x=x;
this.y=y;
//星球的半径
this.radius=radius;
//公转周期
this.cycle=cycle;
//星球的颜色(开始颜色，结束颜色)
this.sColor=sColor;
this.eColor=eColor;
//新建一个渐变颜色空对象
this.color=null;
this.time=0;
this.draw=function(){
//保存之前画布
cxt.save();
//重置00坐标点
cxt.translate(500,500);
//设置旋转角度
//alert(360/this.cycle);
cxt.rotate(this.time*(360/this.cycle)*Math.PI/180);
//画星球
cxt.beginPath();
cxt.arc(this.x,this.y,this.radius,0,360,false);
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.closePath();
//塞入之前画布中去
cxt.restore();
this.time+=1;
}
}
//创建一个太阳对象的构造函数
function sun(){
Star.call(this,0,0,20,0,"#f00","#f90");
//将Star方法调用到当前对象，并给予参数
}
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>
关键字词：canvas实例2,太阳系2,个人博客