/*
 * jQuery UI Effects Shake
 *
 * Copyright (c) 2008 Aaron Eisenberger (aaronchi@gmail.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * http://docs.jquery.com/UI/Effects/Shake
 *
 * Depends:
 *	effects.core.js
 *
 */
(function($) {

$.effects.shake = function(o) {

	return this.queue(function() {

		// Create element
		var el = $(this), props = ['position','top','left'];
		
		// Set options
		var mode = $.effects.setMode(el, o.options.mode || 'effect'); // Set Mode
		var direction = o.options.direction || 'left'; // Default direction
		var distance = o.options.distance || 20; // Default distance
		var times = o.options.times || 3; // Default # of times
		var speed = o.duration || o.options.duration || 140; // Default speed per shake
		
		// Adjust
		$.effects.save(el, props); el.show(); // Save & Show
		$.effects.createWrapper(el); // Create Wrapper
		var ref = (direction == 'up' || direction == 'down') ? 'top' : 'left';
		var motion = (direction == 'up' || direction == 'left') ? 'pos' : 'neg';
		
		// Animation
		var animation = {}, animation1 = {}, animation2 = {};
		animation[ref] = (motion == 'pos' ? '-=' : '+=')  + distance;
		animation1[ref] = (motion == 'pos' ? '+=' : '-=')  + distance * 2;
		animation2[ref] = (motion == 'pos' ? '-=' : '+=')  + distance * 2;
		
		// Animate
		el.animate(animation, speed, o.options.easing);
		for (var i = 1; i < times; i++) { // Shakes
			el.animate(animation1, speed, o.options.easing).animate(animation2, speed, o.options.easing);
		};
		el.animate(animation1, speed, o.options.easing).
		animate(animation, speed / 2, o.options.easing, function(){ // Last shake
			$.effects.restore(el, props); $.effects.removeWrapper(el); // Restore
			if(o.callback) o.callback.apply(this, arguments); // Callback
		});
		el.queue('fx', function() { el.dequeue(); });
		el.dequeue();
	});
	
};

})(jQuery);
