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How to draw a fan shape at any angle with CSS

高洛峰Original: 2017-02-22 11:54:292525browse

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;}
</style>
</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 combining 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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