颜色空间RGB与HSV(HSL)的转换
好文推荐:http://blog.csdn.net/jiangxinyu/article/details/8000999
从 HSV 到 RGB 的转换
类似的，给定在 HSV 中 (h, s, v) 值定义的一个颜色，带有如上的 h，和分别表示饱和度和明度的 s 和 v 变化于 0 到 1 之间，在 RGB 空间中对应的 (r, g, b) 三原色可以计算为：
对于每个颜色向量 (r, g, b),
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Untitled Document</title>
</head>
<body>
<script type="text/JavaScript">
<!--
var colorPicker = function(idStr){
this.colorPool = ["#000000","#993300","#333300","#003300","#003366","#000080","#333399","#333333","#800000","#FF6600","#808000","#008000","#008080","#0000FF","#666699","#808080","#FF0000","#FF9900","#99CC00","#339966","#33CCCC","#3366FF","#800080","#999999","#FF00FF","#FFCC00","#FFFF00","#00FF00","#00FFFF","#00CCFF","#993366","#CCCCCC","#FF99CC","#FFCC99","#FFFF99","#CCFFCC","#CCFFFF","#99CCFF","#CC99FF","#FFFFFF"];
this.initialize(idStr);
}
colorPicker.prototype = {
initialize: function(idStr){
var count=0;
var html = ‘‘;
var self = this;
html+= ‘<table cellspacing="5" cellpadding="0" border="2" bordercolor="#000000" style="cursor:pointer;background:#ECE9D8" mce_style="cursor:pointer;background:#ECE9D8" >‘;
// html+= ‘<tr><td align="center" colspan="8" width="160" height="20" id="currentColor" bgcolor="#ffffff">当前颜色</td></tr>‘;
for(i=0;i<5;i++)
{
html+= "<tr>";
for(j=0;j<8;j++)
{
html+= ‘<td align="center" width="20" height="20" style="background:‘+ this.colorPool[count]+‘" mce_style="background:‘+ this.colorPool[count]+‘" unselectable="on"> </td>‘;
count++;
}
html+= "</tr>";
}
html+= ‘</table>‘;
this.trigger = document.getElementById(idStr);
this.div = document.createElement(‘div‘);
this.div.innerHTML = html;
var tds = this.div.getElementsByTagName(‘td‘);
for(var i=0,l=tds.length;i<l;i++){
tds[i].onclick = function(){
self.setColor(this.style.backgroundColor);
}
}
this.div.id = ‘myColorPicker‘;
this.trigger.parentNode.appendChild(this.div);
this.div.style.position = ‘absolute‘;
this.div.style.left = this.trigger.offsetLeft + ‘px‘
this.div.style.top = (this.trigger.clientHeight + this.trigger.offsetTop)+ ‘px‘;
//this.hide();
this.trigger.onclick = function(){
if(self.div.style.display == ‘none‘){
self.show();
return false;
}else{
self.hide();
return false;
}
}
},
setColor : function(c){
this.hide();
document.getElementById(‘demo‘).style.backgroundColor = c //proEditor.setColor(c); //自己定义函数决定setColor的功能
},
hide : function(){
this.div.style.display = ‘none‘
},
show : function(){
this.div.style.display = ‘block‘
}
}
// -->
</script>
<div >
<a href="#" mce_href="#" onclick="initColorPicker();return false" id="demo" style="position:absolute;left:200px">颜色选择</a>
</div>
<script type="text/javascript">
<!--
function initColorPicker(){
picker = new colorPicker(‘demo‘);
}
// -->
</script>
</body>
</html>
时间： 2024-10-13 22:13:23