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Use canvas to create rotating Taiji sample sharing

Source: Internet
Author: User
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Long time no move canvas, this afternoon suddenly want to review, wrote a rotation of Tai chi, haha, quite fun, in here will write their own process to show out, rotate the use of CSS implementation, not with canvas their own, I hope the big boys do not spit groove. This article mainly introduces the data of the example of canvas making rotating taiji, hoping to help everyone.

Objective

Css

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);    }}

Html

<body>    <canvas id= "Canvas" width= "height=" ></canvas></body>

Js

Let CTX = document    . getElementById ("Canvas")    . GetContext ("2d");//Left-black-bigctx.beginpath (); Ctx.fillstyle = "#000"; Ctx.arc (250,250,200,math.pi/2,math.pi*1.5,false); Ctx.closepath (); Ctx.fill ();// Right-white-bigctx.beginpath (); ctx.fillstyle = "#fff"; Ctx.arc (250,250,200,math.pi/2,math.pi*1.5,true); Ctx.closepath (); Ctx.fill ();//Top-black-middlectx.beginpath (); ctx.fillstyle = "#000"; Ctx.arc (250,150,100,math.pi/ 2,math.pi*1.5,true); Ctx.closepath (); Ctx.fill ();//Bottom-white-middlectx.beginpath (); ctx.fillstyle = "#fff"; Ctx.arc (250,350,100,math.pi/2,math.pi*1.5,false); Ctx.closepath (); Ctx.fill ();//Top-white-smallctx.beginpath (); Ctx.fillstyle = "#fff"; Ctx.arc (250,150,25,0,math.pi*2); Ctx.closepath (); Ctx.fill ();// Bottom-black-smallctx.beginpath (); ctx.fillstyle = "#000"; Ctx.arc (250,350,25,0,math.pi*2); Ctx.closepath (); Ctx.fill ();

Effect

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