Canvas 精度条 demo
帮问答模块一哥们写demo
效果图如下：
<!DOCTYPE>
<html>
<head>
<meta charset="utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{padding:0px; margin:0px;}
html{height:100%;}
body{height:100%;}
#shoot{width:100%; height:100%; background:#FFC; text-align:center; line-height:60px;}
</style>
<script type="text/javascript">
var c;
var cxt;
var loadresult=-1;
var loadtext="Loading...";
var loadValue=0;
var temp=false;
function demo(){
c=document.getElementById("myCanvas");
cxt=c.getContext("2d");
cxt.lineWidth=1;
cxt.fillStyle="#666666";
cxt.strokeStyle="black";
cxt.beginPath();
cxt.arc(100,100,50,0,Math.PI*2,true);
cxt.closePath();
cxt.fill();
cxt.fillStyle="#FFFFFF";
cxt.beginPath();
cxt.arc(100,100,28,0,Math.PI*2,true);
cxt.closePath();
cxt.fill();
cxt.fillStyle="black";
cxt.fillText(loadtext,77,100);
cxt.save();
}
function show()
{
demo();
}
function loadfun()
{
window.setInterval("changeText()",200)
}
function changeText()
{
cxt.clearRect(85,102,20,15);
loadValue+=1;
loadtext=loadValue+"%";
cxt.fillText(loadtext,90,112);
loadresult+=4;
cxt.beginPath();
cxt.strokeStyle = "black";
cxt.lineWidth = 20;
/**
* context.arc(x, y, radius, startAngle, endAngle, anticlockwise)
* 画圆弧，可以是整个弧，也可以是一部分
* @param: x 圆弧的中心坐标
* @param: y 圆弧的中心坐标
* @param: radius 圆弧的半径
* @param: startAngle 圆弧的起始角度
* @param: endAngle 圆弧的结束角度
* @param: anticlockwise 是否为《逆》时针方向
*
* 其中角度是沿着x轴方向为0或360度，x轴的反向为180度
* y轴的反向为90度，y轴方向为270度
*/
cxt.arc(100, 100, 38, (Math.PI / 180) * loadresult, (Math.PI / 180) * 360, true);
cxt.stroke();
cxt.closePath();
}
</script>
</head>
<body onLoad="show()">
<input type="button" value="Loading..." onClick="loadfun()"/>
<div id="shoot">
<canvas id="myCanvas" width="1400px" height="800px">
抱歉！您的浏览器不支持html5的canvasAPI，请更换浏览器查看！
</canvas>
</div>
</body>
</html> 相关推荐
sucheng 2020-04-29
choupiaoyi 2020-01-23
redis 2016-11-17
codable 2018-12-21
luojinbai 2017-03-28
feinifi 2018-06-26
芋道源码 2015-11-25
hushhw 2015-11-23
mjperhuo 2011-04-13
zhangmingming 2013-07-11
安防监控ezhf 2019-06-21
qiuzhuoxian 2012-09-01