Canvas制作旋转的太极的示例HTML5 Canvas旋转动画的2个代码例子（一个旋转的太极图效果）canvas绘制太极图的实现示例

 body{ background: #ddd; } #canvas{ position: absolute; left: 40%; top: 30%; -webkit-transform: translate(-50%,-50%); -moz-transform: translate(-50%,-50%); -ms-transform: translate(-50%,-50%); -o-transform: translate(-50%,-50%); transform: translate(-50%,-50%); -webkit-animation: testAnimate 3s linear infinite; -o-animation: testAnimate 3s linear infinite; animation: testAnimate 3s linear infinite; } @keyframes testAnimate { from { -webkit-transform: rotate(0); -moz-transform: rotate(0); -ms-transform: rotate(0); -o-transform: rotate(0); transform: rotate(0); } to { -webkit-transform: rotate(360deg); -moz-transform: rotate(360deg); -ms-transform: rotate(360deg); -o-transform: rotate(360deg); transform: rotate(360deg); } } 

 let ctx = document .getElementById("canvas") .getContext("2d"); // left-black-big ctx.beginPath(); ctx.fillStyle = "#000"; ctx.arc(250,250,200,Math.PI/2,Math.PI*1.5,false); ctx.closePath(); ctx.fill(); // right-white-big ctx.beginPath(); ctx.fillStyle = "#fff"; ctx.arc(250,250,200,Math.PI/2,Math.PI*1.5,true); ctx.closePath(); ctx.fill(); // top-black-middle ctx.beginPath(); ctx.fillStyle = "#000"; ctx.arc(250,150,100,Math.PI/2,Math.PI*1.5,true); ctx.closePath(); ctx.fill(); // bottom-white-middle ctx.beginPath(); ctx.fillStyle = "#fff"; ctx.arc(250,350,100,Math.PI/2,Math.PI*1.5,false); ctx.closePath(); ctx.fill(); // top-white-small ctx.beginPath(); ctx.fillStyle = "#fff"; ctx.arc(250,150,25,0,Math.PI*2); ctx.closePath(); ctx.fill(); // bottom-black-small ctx.beginPath(); ctx.fillStyle = "#000"; ctx.arc(250,350,25,0,Math.PI*2); ctx.closePath(); ctx.fill();