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Canvas: An Example of the rotation of Taiji.

Source: Internet
Author: User
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Canvas: An Example of the rotation of Taiji.

Preface

I haven't moved canvas for a long time. I suddenly wanted to review it this afternoon. I wrote a rotating tai chi. Haha, it's fun. Here I will show my own writing process, the css used for rotation is not implemented by the canvas itself. I hope that the big players will not speak out.

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="500" height="500"></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

The above is all the content of this article. I hope it will be helpful for your learning and support for helping customers.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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