下面是源码 需要浏览器支持HTML5

复制代码 代码如下:

<html>

<head>

</head>

<body>

<canvas id=”colorPicker” onmousemove=”showCurrentColor(event)”>

</canvas>

<br/>

<div id=”textResult”>

</div>

<script type=”text/javascript”>

if(document.createElement(“canvas”)){

if(document.getElementById(“colorPicker”).getContext){

var can = document.getElementById(“colorPicker”);

can.setAttribute(“height”,300);

var cxt = can.getContext(“2d”);

var gradient = cxt.createLinearGradient(0.5,0.5,0,150);

gradient.addColorStop(0,’#00ff00′);

gradient.addColorStop(1,’#ff0000′);

cxt.fillStyle=gradient;

cxt.fillRect(0,0,60,200);

var ox= can.offsetLeft

var oy = can.offsetTop;

var span = document.createElement(“input”);

span.setAttribute(“id”,”rgba”);

document.getElementById(“textResult”).appendChild(span);

}

}

function showCurrentColor(e){

var x = e.clientX – 8;

var y = e.clientY – 29;

var w = 10;

if(document.createElement(“canvas”)){

if(document.getElementById(“colorPicker”).getContext){

var can = document.getElementById(“colorPicker”);

var cxt = can.getContext(“2d”);

var gradient = cxt.createLinearGradient(0.5,0.5,0,150);

var span = document.getElementById(“rgba”);

var imgDatas = cxt.getImageData(ox,oy,10,200);

var imgData = imgDatas.data;

var g = imgData[4 *(w)*(y)+(x)*4 + 1];

var r = imgData[4 *(w)*(y)+(x)*4];

var b = imgData[4 *(w)*(y)+(x)*4 + 2];

var a = imgData[4 *(w)*(y)+(x)*4 + 3];

span.value=”r=”+r+” g=”+ g+” b=”+b +” a=”+a;

document.getElementById(“textResult”).appendChild(span);

}

}

}

</script>

</body>

</html>



声明：本站（华域联盟www.cnhackhy.com）所有文章，如无特殊说明或标注，均为本站原创发布。任何个人或组织，在未征得本站同意时，禁止复制、盗用、采集、发布本站内容到任何网站、书籍等各类媒体平台。如若本站内容侵犯了原著者的合法权益，可联系我们进行处理。