/**
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.
*/

IceSlideShow.KenBurns=new Class({Extends:IceSlideShow,options:{pan:[100,100],zoom:[50,50]},initialize:function(el,data,options){options.overlap=true;options.resize=true;['pan','zoom'].each(function(p){if($chk(this[p])){if($type(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')){['a','b'].each(function(image){this[image].set('tween',{'duration':this.options.duration,'link':'cancel','onStart':this._start.bind(this),'onComplete':this._complete.bind(this),'property':'opacity'}).get('morph',{'duration':(this.options.delay+this.options.duration * 2),'link':'cancel','transition':$arguments(0)});},this);}this.image.set('styles',{'bottom':'auto','left':'auto','right':'auto','top':'auto'});var props=['top left','top right','bottom left','bottom right'][this.counter % 4].split(' ');props.each(function(prop){this.image.setStyle(prop,0);},this);dh=this.height/this.preloader.height;dw=this.width/this.preloader.width;delta=(dw>dh)?dw:dh;var values={};var zoom=($random.run(this.options.zoom)/100.0)+1;var pan=Math.abs(($random.run(this.options.pan)/100.0) - 1);['height','width'].each(function(prop,i){var e=Math.ceil(this.preloader[prop] * delta);var 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);if(fast||paused){this._center(this.image);this.image.get('morph').cancel();if(paused)this.image.get('tween').cancel().set(0).start(1);elsethis.image.get('tween').cancel().set(1);}else{this.image.get('morph').start(values);this.image.get('tween').set(0).start(1);}}});