Two.js 实现二维动画效果详解

<script type="text/javascript">
 //在整个body中绘制绘图区
 var two = new Two({
  fullscreen:true,//设置是否全屏
  autostart:true,//是否自动启动动画 
 }).appendTo(document.body);
   
 var star = two.makeStar(two.width/2,two.height/2,50,125);
 //two.update();//映射到页面上
 two.bind('update',function(frameCount){
  star.rotation +=0.03;
 })
   
</script>

<!DOCTYPE html>
<html>
 <head>
  <meta charset="UTF-8">
  <title></title>
  <style type="text/css">
   svg{
    background-color: black;
   }
  </style>
  <script src="js/two.JS.js" type="text/javascript" charset="utf-8"></script>
 </head>
 <body>
  <!--创建div绘图区-->
  <div id="draw-shapes">
   
  </div>
  <script type="text/javascript">
   var elem = document.getElementById("draw-shapes");
   var params = {width:400,height:400};
   var two = new Two(params).appendTo(elem);
   var circle = two.makeCircle(-72,0,50);//前两个是x轴y轴，然后是圆的半径
   var star = two.makeStar(75,0,75,35,5);
//   var ss = two.makeCurve(250,30,46,50,465,48,79,36,94);
   
   circle.fill = "#ccd0d5";//填充颜色
   circle.lineWidth = 15;//边线的宽度
   circle.stroke = "#FED519";//边线的颜色
   
   star.fill = "yellow";
   star.opacity = 0.5;//设置透明度
   circle.noStroke();//去掉边线
   
   var group = two.makeGroup(circle,star);//将两个图形合并到一个组中
//   group.fill = "#ffffff";
   
   group.translation.set(two.width/2,two.height/2);
   group.rotation = Math.PI;
   group.scale = 0.1;
   
   two.update();
   
   two.bind('update',function(frameCount){
    if(group.scale>0.99999){
     //将缩放与旋转的度数变成0
     group.scale = group.rotation = 0;
    }
    var t = (1- group.scale) * 0.3;
    group.scale +=t;
    group.rotation +=t *3*Math.PI;
   }).play();
  </script>
 </body>
</html>