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html5中用canvas画八大行星围绕太阳转

2024-07-06 16:11:57   223人阅读

 

   

<%@ 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>

 


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