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How to implement a sector shape at any angle with CSS (code example)

不言forward: 2018-11-24 14:37:563134browse

The content of this article is about how to realize a sector shape at any angle with CSS (code example). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you. helped.

Principle of fan-shaped production, there is a solid color prototype at the bottom, and two semicircles of the same color inside, which can be white. The internal semicircle changes at a certain angle to produce a fan-shaped effect

<html>
<head>
    <meta charset="UTF-8">
    <title>扇形绘制</title>
    <style> 
    .shanxing{ position: relative; width: 200px; height: 200px; border-radius: 100px; background-color: yellow;
        } 
        .sx1{ position: absolute; width: 200px; height: 200px; transform: rotate(0deg); clip: rect(0px,100px,200px,0px); /*这个clip属性用来绘制半圆，在clip的rect范围内的内容显示出来，使用clip属性，元素必须是absolute的 */ border-radius: 100px; background-color: #f00;
            /*-webkit-animation: an1 2s infinite linear; */
        } 
        .sx2{ position: absolute; width: 200px; height: 200px; transform: rotate(0deg); clip: rect(0px,100px,200px,0px); border-radius: 100px; background-color: #f00;
            /*-webkit-animation: an2 2s infinite linear;*/
        }
        /*绘制一个60度扇形*/ .shanxing1 .sx1{transform: rotate(-30deg);} .shanxing1 .sx2{transform: rotate(-150deg);}

        /*绘制一个85度扇形*/ .shanxing2 .sx1{transform: rotate(-45deg);} .shanxing2 .sx2{transform: rotate(-140deg);}

        /*绘制一个向右扇形，90度扇形*/ .shanxing3 .sx1{transform: rotate(45deg);} .shanxing3 .sx2{transform: rotate(-45deg);}

        /*绘制一个颜色扇形 */ .shanxing4 .sx1{transform: rotate(45deg);background-color: #fff;} .shanxing4 .sx2{transform: rotate(-45deg);background-color: #fff;}

        /*绘制一个不同颜色半圆夹角 */ .shanxing5 .sx1{transform: rotate(45deg);background-color: #f00;} .shanxing5 .sx2{transform: rotate(-45deg);background-color: #0f0;}
</st
</head>
<body> 扇形制作原理，底部一个纯色原形，里面2个相同颜色的半圆，可以是白色,内部半圆按一定角度变化，就可以产生出扇形效果 <p>/绘制一个60度扇形/</p>

<div class="shanxing shanxing1">
    <div class="sx1"></div>
     <div class="sx2"></div>
</div>
<p>/*绘制一个85度扇形*/</p>
<div class="shanxing shanxing2">
    <div class="sx1"></div>
     <div class="sx2"></div>
</div>
<p>/*绘制一个向右扇形，90度扇形*/</p>
<div class="shanxing shanxing3">
    <div class="sx1"></div>
     <div class="sx2"></div>
</div>
<p>/*绘制一个颜色扇形 */</p>
<div class="shanxing shanxing4">
    <div class="sx1"></div>
     <div class="sx2"></div>
</div>

<p>/*绘制一个不同颜色半圆夹角 */</p>
<div class="shanxing shanxing5">
    <div class="sx1"></div>
     <div class="sx2"></div>
</div>

</body> 
</html>

The following is A more complex ring graphic combined with css html5 javascript

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>circle</title>

    <style type="text/css"> #myCanvas{} #nihao{ position: absolute; top:10px; z-index: 1;
    }
    </style>
  </head>
<body style="background:#FBFBFB;">

<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"> not suopport canvas </canvas>
<div id="nihao"></div>
<script>
var text=document.getElementById("nihao");
text.innerHTML="woshiwuxinguo"; var i=0.9;//这里默认设置好评率为90%

var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d");
ctx.beginPath();
ctx.lineWidth=10;
ctx.strokeStyle="gray";
ctx.arc(100,75,50,0,2*Math.PI);
ctx.fillStyle="#FBFBFB";
ctx.fill();
ctx.stroke();
ctx.beginPath();
ctx.translate(100,75);
ctx.rotate(-90*Math.PI/180);
ctx.strokeStyle="#FFCFCF";
ctx.arc(0,0,50,0,2*Math.PI*i);
ctx.stroke();
c.addEventListener("mouseover", function(e) {
ctx.beginPath();
ctx.strokeStyle="gray";
ctx.arc(0,0,50,0,2*Math.PI);
ctx.stroke(); var finish=i; var step=0; var internal=setInterval(function(e) {
console.log("step:"+step); if(step<finish){
    step=step+0.01;
    ctx.beginPath();
    ctx.strokeStyle="#FFCFCF";
    ctx.arc(0,0,50,0,2*Math.PI*step);
    ctx.stroke();
    }else{
    clearInterval(internal);
    }
}, 0.5)
}, true) </script> 

</body>
</html>

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