扇形制作原理,底部一個純色原形,裡面2個相同顏色的半圓,可以是白色,內部半圓按一定角度變化,就可以產生出扇形效果,下面就介紹如何使用CSS繪制任意角度的扇形。
演示網址:http://www.linuxidc.com/yanshi/2017/01/shanxing/index.html
<html>
<head>
<meta charset="UTF-8">
<title>扇形繪制</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); /*這個clip屬性用來繪制半圓,在clip的rect范圍內的內容顯示出來,使用clip屬性,元素必須是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;*/
}
/*繪制一個60度扇形*/
.shanxing1 .sx1{transform: rotate(-30deg);}
.shanxing1 .sx2{transform: rotate(-150deg);}
/*繪制一個85度扇形*/
.shanxing2 .sx1{transform: rotate(-45deg);}
.shanxing2 .sx2{transform: rotate(-140deg);}
/*繪制一個向右扇形,90度扇形*/
.shanxing3 .sx1{transform: rotate(45deg);}
.shanxing3 .sx2{transform: rotate(-45deg);}
/*繪制一個顏色扇形 */
.shanxing4 .sx1{transform: rotate(45deg);background-color: #fff;}
.shanxing4 .sx2{transform: rotate(-45deg);background-color: #fff;}
/*繪制一個不同顏色半圓夾角 */
.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,底部一個純色原形,裡面2個相同顏色的半圓,可以是白色,內部半圓按一定角度變化,就可以產生出扇形效果
<p>/*繪制一個60度扇形*/</p>
<div class="shanxing shanxing1">
<div class="sx1"></div>
<div class="sx2"></div>
</div>
<p>/*繪制一個85度扇形*/</p>
<div class="shanxing shanxing2">
<div class="sx1"></div>
<div class="sx2"></div>
</div>
<p>/*繪制一個向右扇形,90度扇形*/</p>
<div class="shanxing shanxing3">
<div class="sx1"></div>
<div class="sx2"></div>
</div>
<p>/*繪制一個顏色扇形 */</p>
<div class="shanxing shanxing4">
<div class="sx1"></div>
<div class="sx2"></div>
</div>
<p>/*繪制一個不同顏色半圓夾角 */</p>
<div class="shanxing shanxing5">
<div class="sx1"></div>
<div class="sx2"></div>
</div>
</body>
</html>
下面這個是結合css+html5+javascript的一個更復雜的圓環圖形
<%@ 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 >
<canvas id="myCanvas" width="300" height="150" >
not suopport canvas
</canvas>
<div id="nihao"></div>
<script>
var text=document.getElementById("nihao");
text.innerHTML="woshiwuxinguo";
var i=0.9;//這裡默認設置好評率為90%
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.beginPath();
ctx.lineWidth=10;
ctx.stroke;
ctx.arc(100,75,50,0,2*Math.PI);
ctx.fill;
ctx.fill();
ctx.stroke();
ctx.beginPath();
ctx.translate(100,75);
ctx.rotate(-90*Math.PI/180);
ctx.stroke;
ctx.arc(0,0,50,0,2*Math.PI*i);
ctx.stroke();
c.addEventListener("mouseover", function(e) {
ctx.beginPath();
ctx.stroke;
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.stroke;
ctx.arc(0,0,50,0,2*Math.PI*step);
ctx.stroke();
}else{
clearInterval(internal);
}
}, 0.5)
}, true)
</script>
</body>
</html>