取色器

- 中国WEB开发者网络 (http://www.webasp.net)
-- 网页特效 (http://www.webasp.net/javascript/)
--- 取色器 (http://www.webasp.net/javascript/1/382.htm)
-- 发布日期： 2005-06-07
<!-- 网页特效代码由[中国WEB开发者网络:http://www.ChinaWebDev.com]提供！ -->
<!-- 要实现此效果需要 3 个步骤： -->

<!-- 第 1 步： -->
<!-- 把下面的代码加到<HEAD></HEAD>区域中： -->

<script>
addary = new Array(); //red
addary[0] = new Array(0,1,0); //red green
addary[1] = new Array(-1,0,0); //green
addary[2] = new Array(0,0,1); //green blue
addary[3] = new Array(0,-1,0); //blue
addary[4] = new Array(1,0,0); //red blue
addary[5] = new Array(0,0,-1); //red
addary[6] = new Array(255,1,1);
clrary = new Array(360);
for(i = 0; i < 6; i++)
for(j = 0; j < 60; j++) {
clrary[60 * i + j] = new Array(3);
for(k = 0; k < 3; k++) {
clrary[60 * i + j][k] = addary[6][k];
addary[6][k] += (addary[i][k] * 4);
}
}
function capture() {
if(document.layers) {
layobj = document.layers['wheel'];
layobj.document.captureEvents(Event.MOUSEMOVE);
layobj.document.onmousemove = moved;
}
else {
layobj = document.all["wheel"];
layobj.onmousemove = moved;
}
}
function moved(e) {
y = 4 * ((document.layers)?e.layerX:event.offsetX);
x = 4 * ((document.layers)?e.layerY:event.offsetY);
sx = x - 512;
sy = y - 512;
qx = (sx < 0)?0:1;
qy = (sy < 0)?0:1;
q = 2 * qy + qx;
quad = new Array(-180,360,180,0);
xa = Math.abs(sx);
ya = Math.abs(sy);
d = ya * 45 / xa;
if(ya > xa) d = 90 - (xa * 45 / ya);
deg = Math.floor(Math.abs(quad[q] - d));
n = 0;
sx = Math.abs(x - 512);
sy = Math.abs(y - 512);
r = Math.sqrt((sx * sx) + (sy * sy));
if(x == 512 & y == 512) {
c = "000000";
}
else {
for(i = 0; i < 3; i++) {
r2 = clrary[deg][i] * r / 256;
if(r > 256) r2 += Math.floor(r - 256);
if(r2 > 255) r2 = 255;
n = 256 * n + Math.floor(r2);
}
c = n.toString(16);
while(c.length < 6) c = "0" + c;
}
if(document.layers) {
document.layers["wheel"].document.f.t.value = "#" + c;
document.layers["wheel"].bgColor = "#" + c;
}
else {
document.all["wheel"].document.f.t.value = "#" + c;
document.all["wheel"].style.backgroundColor = "#" + c;
}
return false;
}
</script>




<!-- 第 2 步： -->
<!-- 把<BODY>中的属性代码改为： -->

<BODY onLoad="capture()">



<!-- 第 3 步： -->
<!-- 把下面的代码加到<BODY></BODY>区域中： -->

<div id=wheel style="position:absolute; visibility:visible;; width: 256px; height: 256px; left: 263px; top: 14px">
<table border=0 cellpadding=0 cellspacing=0>
<tr>
<td>
<img src="../images/382/1.jpg" width=256 height=256 border=0>
</td>
</tr>
<tr>
<td align="center">
<br>
<form name="f">
<input type="text" name="t" size=27>
</form>
</td>
</tr>
</table>
</div>

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