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| 给图片添加图片的倒影 |
| 整理：Cnwshow.Com 来源：Internet 整理时间：2008-6-19 |
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>给图片添加图片的倒影</title>
<SCRIPT LANGUAGE="JavaScript">
<!--
document.getElementsByClassName = function(className) {
var children = document.getElementsByTagName('*') || document.all;
var elements = new Array();
for (var i = 0; i < children.length; i++) {
var child = children[i];
var classNames = child.className.split(' ');
for (var j = 0; j < classNames.length; j++) {
if (classNames[j] == className) {
elements.push(child);
break;
}
}
}
return elements;
}
var Reflection = {
defaultHeight : 0.5,
defaultOpacity: 0.5,
add: function(image, options) {
Reflection.remove(image);
doptions = { "height" : Reflection.defaultHeight, "opacity" : Reflection.defaultOpacity }
if (options) {
for (var i in doptions) {
if (!options[i]) {
options[i] = doptions[i];
}
}
} else {
options = doptions;
}
try {
var d = document.createElement('div');
var p = image;
var classes = p.className.split(' ');
var newClasses = '';
for (j=0;j<classes.length;j++) {
if (classes[j] != "reflect") {
if (newClasses) {
newClasses += ' '
}
newClasses += classes[j];
}
}
var reflectionHeight = Math.floor(p.height*options['height']);
var divHeight = Math.floor(p.height*(1+options['height']));
var reflectionWidth = p.width;
/* Copy original image's classes & styles to div */
d.className = newClasses;
p.className = 'reflected';
d.style.cssText = p.style.cssText;
p.style.cssText = ' ';
if (document.all && !window.opera) {
var reflection = document.createElement('img');
reflection.src = p.src;
reflection.style.width = reflectionWidth+'px';
reflection.style.marginBottom = "-"+(p.height-reflectionHeight)+'px';
reflection.style.filter = 'flipv progid:DXImageTransform.Microsoft.Alpha(opacity='+(options['opacity']*100)+', style=1, finishOpacity=0, startx=0, starty=0, finishx=0, finishy='+(options['height']*100)+')';
d.style.width = reflectionWidth+'px';
d.style.height = divHeight+'px';
p.parentNode.replaceChild(d, p);
d.appendChild(p);
d.appendChild(reflection);
} else {
var canvas = document.createElement('canvas');
var context = canvas.getContext("2d");
canvas.style.height = reflectionHeight+'px';
canvas.style.width = reflectionWidth+'px';
canvas.height = reflectionHeight;
canvas.width = reflectionWidth;
d.style.width = reflectionWidth+'px';
d.style.height = divHeight+'px';
p.parentNode.replaceChild(d, p);
d.appendChild(p);
d.appendChild(canvas);
context.save();
context.translate(0,image.height-1);
context.scale(1,-1);
context.drawImage(image, 0, 0, reflectionWidth, image.height);
context.restore();
context.globalCompositeOperation = "destination-out";
var gradient = context.createLinearGradient(0, 0, 0, reflectionHeight);
gradient.addColorStop(1, "rgba(255, 255, 255, 1.0)");
gradient.addColorStop(0, "rgba(255, 255, 255, "+(1-options['opacity'])+")");
context.fillStyle = gradient;
if (navigator.appVersion.indexOf('WebKit') != -1) {
context.fill();
} else {
context.fillRect(0, 0, reflectionWidth, reflectionHeight*2);
}
}
} catch (e) {
}
},
remove : function(image) {
if (image.className == "reflected") {
image.className = image.parentNode.className;
image.parentNode.parentNode.replaceChild(image, image.parentNode);
}
}
}
function addReflections() {
var rimages = document.getElementsByClassName('reflect');
for (i=0;i<rimages.length;i++) {
var rheight = null;
var ropacity = null;
var classes = rimages[i].className.split(' ');
for (j=0;j<classes.length;j++) {
if (classes[j].indexOf("rheight") == 0) {
var rheight = classes[j].substring(7)/100;
} else if (classes[j].indexOf("ropacity") == 0) {
var ropacity = classes[j].substring(8)/100;
}
}
Reflection.add(rimages[i], { height: rheight, opacity : ropacity});
}
}
var previousOnload = window.onload;
window.onload = function () { if(previousOnload) previousOnload(); addReflections(); }
//-->
</SCRIPT>
</head>
<body>
<img class="reflect" src="04.jpg">
</body>
</html>
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