vtigerossez/include/js/reflection.js

/**
 * reflection.js v1.5
 *
 * Contributors: Cow http://cow.neondragon.net
 *               Gfx http://www.jroller.com/page/gfx/
 *               Sitharus http://www.sitharus.com
 *               Andreas Linde http://www.andreaslinde.de
 *               Tralala, coder @ http://www.vbulletin.org
 *
 * Freely distributable under MIT-style license.
 */
 
/* From prototype.js */
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(); }