/**
Script: Slideshow.KenBurns.js
	Slideshow.KenBurns - KenBurns extension for Slideshow, includes zooming and panning effects.

License:
	MIT-style license.

Copyright:
	Copyright (c) 2008 [Aeron Glemann](http://www.electricprism.com/aeron/).
	
Dependencies:
	Slideshow.
*/
(function () {Slideshow.KenBurns = new Class({Extends:Slideshow, options:{pan:[100, 100], zoom:[50, 50]}, initialize:function (el, data, options) {options = options || {};options.overlap = true;options.resize = "fill";["pan", "zoom"].each(function (p) {if (this[p] != undefined) {if (typeOf(this[p]) != "array") {this[p] = [this[p], this[p]];}this[p].map(function (n) {return (n.toInt() || 0).limit(0, 100);});}}, options);this.parent(el, data, options);}, _show:function (fast) {if (!this.image.retrieve("morph")) {$$(this.a, this.b).set({tween:{duration:this.options.duration, link:"cancel", onStart:this._start.bind(this), onComplete:this._complete.bind(this), property:"opacity"}, morph:{duration:this.options.delay + this.options.duration * 2, link:"cancel", transition:"linear"}});}this.image.set("styles", {bottom:"auto", left:"auto", right:"auto", top:"auto"});var props = ["top left", "top right", "bottom left", "bottom right"][this.counter % 4].split(" ");this.image.setStyles([0, 0].associate(props));var src = this.data.images[this._slide].replace(/([^?]+).*/, "$1"), cache = this.cache[src];dh = this.height / cache.height;dw = this.width / cache.width;delta = dw > dh ? dw : dh;var values = {}, zoom = Number.random.apply(Number, this.options.zoom) / 100 + 1, pan = Math.abs(Number.random.apply(Number, this.options.pan) / 100 - 1);["height", "width"].each(function (prop, i) {var e = Math.ceil(cache[prop] * delta), s = (e * zoom).toInt();values[prop] = [s, e];if (dw > dh || i) {e = this[prop] - this.image[prop];s = (e * pan).toInt();values[props[i]] = [s, e];}}, this);var paused = this.firstrun && this.options.paused || this.paused;if (fast || paused) {this._center(this.image);this.image.get("morph").cancel();if (paused) {this.image.get("tween").cancel().set(0).start(1);} else {this.image.get("tween").cancel().set(1);}} else {this.image.get("morph").start(values);this.image.get("tween").set(0).start(1);}}});})();