heShanYiDong/public/js/jquery.reflection.js

/*!
	reflection.js for jQuery v1.12
*/

;(function($) {

	$.fn.reflect = function(options) {
		options = $.extend({
			height: 1/3,
			opacity: 0.5
		}, options);

		return this.unreflect().each(function() {
			var img = this;
			if (/^img$/i.test(img.tagName)) {
				function doReflect() {
					var imageWidth = img.width, imageHeight = img.height, reflection, reflectionHeight, wrapper, context, gradient;
					reflectionHeight = Math.floor((options.height > 1) ? Math.min(imageHeight, options.height) : imageHeight * options.height);

					reflection = $("<canvas />")[0];
					if (reflection.getContext) {
						context = reflection.getContext("2d");
						try {
							$(reflection).attr({width: imageWidth, height: reflectionHeight});
							context.save();
							context.translate(0, imageHeight-1);
							context.scale(1, -1);
							context.drawImage(img, 0, 0, imageWidth, imageHeight);
							context.restore();
							context.globalCompositeOperation = "destination-out";

							gradient = context.createLinearGradient(0, 0, 0, reflectionHeight);
							gradient.addColorStop(0, "rgba(255, 255, 255, " + (1 - options.opacity) + ")");
							gradient.addColorStop(1, "rgba(255, 255, 255, 1.0)");
							context.fillStyle = gradient;
							context.rect(0, 0, imageWidth, reflectionHeight);
							context.fill();
						} catch(e) {
							return;
						}
					} else {
						if (!window.ActiveXObject) return;
						reflection = $("<img />").attr("src", img.src).css({
							width: imageWidth,
							height: imageHeight,
							marginBottom: reflectionHeight - imageHeight,
							filter: "FlipV progid:DXImageTransform.Microsoft.Alpha(Opacity=" + (options.opacity * 100) + ", FinishOpacity=0, Style=1, StartX=0, StartY=0, FinishX=0, FinishY=" + (reflectionHeight / imageHeight * 100) + ")"
						})[0];
					}
					$(reflection).css({display: "block", border: 0});

					wrapper = $(/^a$/i.test(img.parentNode.tagName) ? "<span />" : "<div />").insertAfter(img).append([img, reflection])[0];
					wrapper.className = img.className;
					$(img).data("reflected", wrapper.style.cssText = img.style.cssText);
					$(wrapper).css({width: imageWidth, height: imageHeight + reflectionHeight, overflow: "hidden"});
					img.style.cssText = "display: block; border: 0px";
					img.className = "reflected";
				}

				if (img.complete) doReflect();
				else $(img).load(doReflect);
			}
		});
	}

	$.fn.unreflect = function() {
		return this.unbind("load").each(function() {
			var img = this, reflected = $(this).data("reflected"), wrapper;

			if (reflected !== undefined) {
				wrapper = img.parentNode;
				img.className = wrapper.className;
				img.style.cssText = reflected;
				$(img).data("reflected", null);
				wrapper.parentNode.replaceChild(img, wrapper);
			}
		});
	}

})(window.jQuery || window.Zepto);