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</pre>
<html>
<head>
<meta charset="UTF-8">
<title>扇形繪製</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屬性用來繪製半圓,在clip的rect範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;*/
}
/*繪製一個60度扇形*/ .shanxing1 .sx1{transform: rotate(-30deg);} .shanxing1 .sx2{transform: rotate(-150deg);}
/*繪製一個85度扇形*/ .shanxing2 .sx1{transform: rotate(-45deg);} .shanxing2 .sx2{transform: rotate(-140deg);}
/*繪製一個向右扇形,90度扇形*/ .shanxing3 .sx1{transform: rotate(45deg);} .shanxing3 .sx2{transform: rotate(-45deg);}
/*繪製一個顏色扇形 */ .shanxing4 .sx1{transform: rotate(45deg);background-color: #fff;} .shanxing4 .sx2{transform: rotate(-45deg);background-color: #fff;}
/*繪製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;}
</st
</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>/繪製一個60度扇形/</p>
<div class="shanxing shanxing1">
<div class="sx1"></div>
<div class="sx2"></div>
</div>
<p>/*繪製一個85度扇形*/</p>
<div class="shanxing shanxing2">
<div class="sx1"></div>
<div class="sx2"></div>
</div>
<p>/*繪製一個向右扇形,90度扇形*/</p>
<div class="shanxing shanxing3">
<div class="sx1"></div>
<div class="sx2"></div>
</div>
<p>/*繪製一個顏色扇形 */</p>
<div class="shanxing shanxing4">
<div class="sx1"></div>
<div class="sx2"></div>
</div>
<p>/*繪製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></pre>
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 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;//這裡預設設定好評率為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></pre>