基于Two.js实现星球环绕动画效果的示例

var elem = document.getElementById('draw-animation');

var two = new Two({ width: 700, height: 700 }).appendTo(elem);

//外层大运行轨迹

var track = two.makeCircle(0, 0, 200);

track.fill='transparent';

track.stroke='#3366FF';

track.linewidth=3;

//sun

var sun = two.makeCircle(0,0,80);

sun.fill='#FF8000';

sun.stroke='#FF0000';

sun.linewidth=5;

//earth

var earth = two.makeCircle(0,0,50);

earth.fill='#9ACD32';

//moon

var moon = two.makeCircle(100,0,30);

moon.fill='#1C75BC';

//inline 小的运行轨迹

var inline = two.makeCircle(0,0,100);

inline.stroke='#3366FF';

inline.fill='transparent';

inline.linewidth=3;

//group 分组 一类型为一组

var group = two.makeGroup(inline,earth,moon);

console.dir(group);

var group1 = two.makeGroup(sun,track,group);

 

group1.translation.set(two.width / 2, two.height / 2); //平移(x,y)父元素的一半

group.translation.set(200, 0); 

group.scale = 0.8; //比例

two.bind('update', function(frameCount) {//执行动画

 group1.rotation += 0.01 *2* Math.PI;

 group.rotation += 0.01 * Math.PI;

}).play();