圖片倒影特效

2011-03-28 圖片特效 ℃

1    把如下代碼復制到<head>與</head>之間

<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 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);
		}
	}
}

var previousOnload = window.onload;
window.onload = function () { if(previousOnload) previousOnload(); addReflections(); }

//-->
</SCRIPT>

2  把如下代碼復制到<body>與</body>之間

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