HTML5 Canvas眨眼睛动画

在网上发现一个java眨眼睛动画,把代码改成了HTML5 +JS,效果如下:
HTML5 Canvas眨眼睛动画

动画中有一些明显不足之处,请会的朋友指正,谢谢!

这里可以看效果: http://www.108js.com/article/article3/view/30157/eye.html
代码如下:
<html>
<body>
 <canvas width="300" height="300" id="canvas" style="background:black"></canvas>
</body>
</html>
<script>

var canvas = document.getElementById('canvas');
 var  graphics = canvas.getContext('2d');
 var  centerX = canvas.width/2;
 var  centerY = canvas.height/2;
 //设置角度值,同时也就眼睛的横坐标长度
 var angle = 300;
  //因为眨眼采用的sin()函数组成,所以其自然有幅值这一个属性。
  var amplitude = 30;
  //创建一个用于保存幅值的变化的变量,采用amplitude的缩写ampl,便于认识 ^_^
  var ampl = 20;
  //灰眼球的半径
   var blackBallSemi = 25;
  var flag = true;
     
  function paint() {
       if (flag) {
          ampl++;
          if (ampl >= amplitude) {
             flag = false;
           }
       }else {
              ampl--;
              if (ampl <= 0) {
               flag = true;
              }
         }
      //以centerX,centerY为中心,在眼睛所在的地方绘制一个白色的背景底色,
        //长度为angle,宽为amplitude*2
        
        graphics.fillStyle="white";
        
        graphics.fillRect(centerX-angle/2, centerY-amplitude, angle, amplitude*2);
        
        //以centerX,centerY为中心,绘制一个灰色的眼球
        //半径为blackBallSemi*2
        graphics.beginPath();
        graphics.fillStyle="black";
        graphics.arc(centerX, centerY, blackBallSemi,0,Math.PI*2,true);
        graphics.fill();
          graphics.beginPath();
        //以centerX,centerY为中心,绘制一个白色的瞳孔
        //半径为blackBallSemi/2
        graphics.fillStyle="white";
        graphics.arc(centerX,centerY, blackBallSemi/4,0,Math.PI*2,true);
        graphics.fill();
         graphics.strokeStyle="red";
           for (var i = 0; i < angle; i++) {
            graphics.moveTo(centerX-angle/2+i,centerY-30);
            graphics.lineTo(centerX-angle/2+i, centerY-(Math.floor(Math.sin(Math.PI*i/angle)*ampl)));
            graphics.moveTo(centerX-angle/2+i,centerY+30);
            graphics.lineTo(centerX-angle/2+i,centerY+(Math.floor(Math.sin(Math.PI*i/angle)*ampl)));
            graphics.stroke();
        }
      
      
    }
   // paint();
 setInterval(paint,30);
</script>


下载源代码: http://www.108js.com/article/article3/30157.html

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