/*!
* Stellar.js v0.6.2
* http://markdalgleish.com/projects/stellar.js
*
* Copyright 2013, Mark Dalgleish
* This content is released under the MIT license
* http://markdalgleish.mit-license.org
*/;(function($,window,document,undefined){var pluginName='stellar',defaults={scrollProperty:'scroll',positionProperty:'position',horizontalScrolling:true,verticalScrolling:true,horizontalOffset:0,verticalOffset:0,responsive:false,parallaxBackgrounds:true,parallaxElements:true,hideDistantElements:true,hideElement:function($elem){$elem.hide();},showElement:function($elem){$elem.show();}},scrollProperty={scroll:{getLeft:function($elem){return $elem.scrollLeft();},setLeft:function($elem,val){$elem.scrollLeft(val);},getTop:function($elem){return $elem.scrollTop();},setTop:function($elem,val){$elem.scrollTop(val);}},position:{getLeft:function($elem){return parseInt($elem.css('left'),10)*-1;},getTop:function($elem){return parseInt($elem.css('top'),10)*-1;}},margin:{getLeft:function($elem){return parseInt($elem.css('margin-left'),10)*-1;},getTop:function($elem){return parseInt($elem.css('margin-top'),10)*-1;}},transform:{getLeft:function($elem){var computedTransform=getComputedStyle($elem[0])[prefixedTransform];return(computedTransform!=='none'?parseInt(computedTransform.match(/(-?[0-9]+)/g)[4],10)*-1:0);},getTop:function($elem){var computedTransform=getComputedStyle($elem[0])[prefixedTransform];return(computedTransform!=='none'?parseInt(computedTransform.match(/(-?[0-9]+)/g)[5],10)*-1:0);}}},positionProperty={position:{setLeft:function($elem,left){$elem.css('left',left);},setTop:function($elem,top){$elem.css('top',top);}},transform:{setPosition:function($elem,left,startingLeft,top,startingTop){$elem[0].style[prefixedTransform]='translate3d('+(left-startingLeft)+'px, '+(top-startingTop)+'px, 0)';}}},vendorPrefix=(function(){var prefixes=/^(Moz|Webkit|Khtml|O|ms|Icab)(?=[A-Z])/,style=$('script')[0].style,prefix='',prop;for(prop in style){if(prefixes.test(prop)){prefix=prop.match(prefixes)[0];break;}}
if('WebkitOpacity'in style){prefix='Webkit';}
if('KhtmlOpacity'in style){prefix='Khtml';}
return function(property){return prefix+(prefix.length>0?property.charAt(0).toUpperCase()+property.slice(1):property);};}()),prefixedTransform=vendorPrefix('transform'),supportsBackgroundPositionXY=$('<div />',{style:'background:#fff'}).css('background-position-x')!==undefined,setBackgroundPosition=(supportsBackgroundPositionXY?function($elem,x,y){$elem.css({'background-position-x':x,'background-position-y':y});}:function($elem,x,y){$elem.css('background-position',x+' '+y);}),getBackgroundPosition=(supportsBackgroundPositionXY?function($elem){return[$elem.css('background-position-x'),$elem.css('background-position-y')];}:function($elem){return $elem.css('background-position').split(' ');}),requestAnimFrame=(window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(callback){setTimeout(callback,1000/60);});function Plugin(element,options){this.element=element;this.options=$.extend({},defaults,options);this._defaults=defaults;this._name=pluginName;this.init();}
Plugin.prototype={init:function(){this.options.name=pluginName+'_'+Math.floor(Math.random()*1e9);this._defineElements();this._defineGetters();this._defineSetters();this._handleWindowLoadAndResize();this._detectViewport();this.refresh({firstLoad:true});if(this.options.scrollProperty==='scroll'){this._handleScrollEvent();}else{this._startAnimationLoop();}},_defineElements:function(){if(this.element===document.body)this.element=window;this.$scrollElement=$(this.element);this.$element=(this.element===window?$('body'):this.$scrollElement);this.$viewportElement=(this.options.viewportElement!==undefined?$(this.options.viewportElement):(this.$scrollElement[0]===window||this.options.scrollProperty==='scroll'?this.$scrollElement:this.$scrollElement.parent()));},_defineGetters:function(){var self=this,scrollPropertyAdapter=scrollProperty[self.options.scrollProperty];this._getScrollLeft=function(){return scrollPropertyAdapter.getLeft(self.$scrollElement);};this._getScrollTop=function(){return scrollPropertyAdapter.getTop(self.$scrollElement);};},_defineSetters:function(){var self=this,scrollPropertyAdapter=scrollProperty[self.options.scrollProperty],positionPropertyAdapter=positionProperty[self.options.positionProperty],setScrollLeft=scrollPropertyAdapter.setLeft,setScrollTop=scrollPropertyAdapter.setTop;this._setScrollLeft=(typeof setScrollLeft==='function'?function(val){setScrollLeft(self.$scrollElement,val);}:$.noop);this._setScrollTop=(typeof setScrollTop==='function'?function(val){setScrollTop(self.$scrollElement,val);}:$.noop);this._setPosition=positionPropertyAdapter.setPosition||function($elem,left,startingLeft,top,startingTop){if(self.options.horizontalScrolling){positionPropertyAdapter.setLeft($elem,left,startingLeft);}
if(self.options.verticalScrolling){positionPropertyAdapter.setTop($elem,top,startingTop);}};},_handleWindowLoadAndResize:function(){var self=this,$window=$(window);if(self.options.responsive){$window.bind('load.'+this.name,function(){self.refresh();});}
$window.bind('resize.'+this.name,function(){self._detectViewport();if(self.options.responsive){self.refresh();}});},refresh:function(options){var self=this,oldLeft=self._getScrollLeft(),oldTop=self._getScrollTop();if(!options||!options.firstLoad){this._reset();}
this._setScrollLeft(0);this._setScrollTop(0);this._setOffsets();this._findParticles();this._findBackgrounds();if(options&&options.firstLoad&&/WebKit/.test(navigator.userAgent)){$(window).load(function(){var oldLeft=self._getScrollLeft(),oldTop=self._getScrollTop();self._setScrollLeft(oldLeft+1);self._setScrollTop(oldTop+1);self._setScrollLeft(oldLeft);self._setScrollTop(oldTop);});}
this._setScrollLeft(oldLeft);this._setScrollTop(oldTop);},_detectViewport:function(){var viewportOffsets=this.$viewportElement.offset(),hasOffsets=viewportOffsets!==null&&viewportOffsets!==undefined;this.viewportWidth=this.$viewportElement.width();this.viewportHeight=this.$viewportElement.height();this.viewportOffsetTop=(hasOffsets?viewportOffsets.top:0);this.viewportOffsetLeft=(hasOffsets?viewportOffsets.left:0);},_findParticles:function(){var self=this,scrollLeft=this._getScrollLeft(),scrollTop=this._getScrollTop();if(this.particles!==undefined){for(var i=this.particles.length-1;i>=0;i--){this.particles[i].$element.data('stellar-elementIsActive',undefined);}}
this.particles=[];if(!this.options.parallaxElements)return;this.$element.find('[data-stellar-ratio]').each(function(i){var $this=$(this),horizontalOffset,verticalOffset,positionLeft,positionTop,marginLeft,marginTop,$offsetParent,offsetLeft,offsetTop,parentOffsetLeft=0,parentOffsetTop=0,tempParentOffsetLeft=0,tempParentOffsetTop=0;if(!$this.data('stellar-elementIsActive')){$this.data('stellar-elementIsActive',this);}else if($this.data('stellar-elementIsActive')!==this){return;}
self.options.showElement($this);if(!$this.data('stellar-startingLeft')){$this.data('stellar-startingLeft',$this.css('left'));$this.data('stellar-startingTop',$this.css('top'));}else{$this.css('left',$this.data('stellar-startingLeft'));$this.css('top',$this.data('stellar-startingTop'));}
positionLeft=$this.position().left;positionTop=$this.position().top;marginLeft=($this.css('margin-left')==='auto')?0:parseInt($this.css('margin-left'),10);marginTop=($this.css('margin-top')==='auto')?0:parseInt($this.css('margin-top'),10);offsetLeft=$this.offset().left-marginLeft;offsetTop=$this.offset().top-marginTop;$this.parents().each(function(){var $this=$(this);if($this.data('stellar-offset-parent')===true){parentOffsetLeft=tempParentOffsetLeft;parentOffsetTop=tempParentOffsetTop;$offsetParent=$this;return false;}else{tempParentOffsetLeft+=$this.position().left;tempParentOffsetTop+=$this.position().top;}});horizontalOffset=($this.data('stellar-horizontal-offset')!==undefined?$this.data('stellar-horizontal-offset'):($offsetParent!==undefined&&$offsetParent.data('stellar-horizontal-offset')!==undefined?$offsetParent.data('stellar-horizontal-offset'):self.horizontalOffset));verticalOffset=($this.data('stellar-vertical-offset')!==undefined?$this.data('stellar-vertical-offset'):($offsetParent!==undefined&&$offsetParent.data('stellar-vertical-offset')!==undefined?$offsetParent.data('stellar-vertical-offset'):self.verticalOffset));self.particles.push({$element:$this,$offsetParent:$offsetParent,isFixed:$this.css('position')==='fixed',horizontalOffset:horizontalOffset,verticalOffset:verticalOffset,startingPositionLeft:positionLeft,startingPositionTop:positionTop,startingOffsetLeft:offsetLeft,startingOffsetTop:offsetTop,parentOffsetLeft:parentOffsetLeft,parentOffsetTop:parentOffsetTop,stellarRatio:($this.data('stellar-ratio')!==undefined?$this.data('stellar-ratio'):1),width:$this.outerWidth(true),height:$this.outerHeight(true),isHidden:false});});},_findBackgrounds:function(){var self=this,scrollLeft=this._getScrollLeft(),scrollTop=this._getScrollTop(),$backgroundElements;this.backgrounds=[];if(!this.options.parallaxBackgrounds)return;$backgroundElements=this.$element.find('[data-stellar-background-ratio]');if(this.$element.data('stellar-background-ratio')){$backgroundElements=$backgroundElements.add(this.$element);}
$backgroundElements.each(function(){var $this=$(this),backgroundPosition=getBackgroundPosition($this),horizontalOffset,verticalOffset,positionLeft,positionTop,marginLeft,marginTop,offsetLeft,offsetTop,$offsetParent,parentOffsetLeft=0,parentOffsetTop=0,tempParentOffsetLeft=0,tempParentOffsetTop=0;if(!$this.data('stellar-backgroundIsActive')){$this.data('stellar-backgroundIsActive',this);}else if($this.data('stellar-backgroundIsActive')!==this){return;}
if(!$this.data('stellar-backgroundStartingLeft')){$this.data('stellar-backgroundStartingLeft',backgroundPosition[0]);$this.data('stellar-backgroundStartingTop',backgroundPosition[1]);}else{setBackgroundPosition($this,$this.data('stellar-backgroundStartingLeft'),$this.data('stellar-backgroundStartingTop'));}
marginLeft=($this.css('margin-left')==='auto')?0:parseInt($this.css('margin-left'),10);marginTop=($this.css('margin-top')==='auto')?0:parseInt($this.css('margin-top'),10);offsetLeft=$this.offset().left-marginLeft-scrollLeft;offsetTop=$this.offset().top-marginTop-scrollTop;$this.parents().each(function(){var $this=$(this);if($this.data('stellar-offset-parent')===true){parentOffsetLeft=tempParentOffsetLeft;parentOffsetTop=tempParentOffsetTop;$offsetParent=$this;return false;}else{tempParentOffsetLeft+=$this.position().left;tempParentOffsetTop+=$this.position().top;}});horizontalOffset=($this.data('stellar-horizontal-offset')!==undefined?$this.data('stellar-horizontal-offset'):($offsetParent!==undefined&&$offsetParent.data('stellar-horizontal-offset')!==undefined?$offsetParent.data('stellar-horizontal-offset'):self.horizontalOffset));verticalOffset=($this.data('stellar-vertical-offset')!==undefined?$this.data('stellar-vertical-offset'):($offsetParent!==undefined&&$offsetParent.data('stellar-vertical-offset')!==undefined?$offsetParent.data('stellar-vertical-offset'):self.verticalOffset));self.backgrounds.push({$element:$this,$offsetParent:$offsetParent,isFixed:$this.css('background-attachment')==='fixed',horizontalOffset:horizontalOffset,verticalOffset:verticalOffset,startingValueLeft:backgroundPosition[0],startingValueTop:backgroundPosition[1],startingBackgroundPositionLeft:(isNaN(parseInt(backgroundPosition[0],10))?0:parseInt(backgroundPosition[0],10)),startingBackgroundPositionTop:(isNaN(parseInt(backgroundPosition[1],10))?0:parseInt(backgroundPosition[1],10)),startingPositionLeft:$this.position().left,startingPositionTop:$this.position().top,startingOffsetLeft:offsetLeft,startingOffsetTop:offsetTop,parentOffsetLeft:parentOffsetLeft,parentOffsetTop:parentOffsetTop,stellarRatio:($this.data('stellar-background-ratio')===undefined?1:$this.data('stellar-background-ratio'))});});},_reset:function(){var particle,startingPositionLeft,startingPositionTop,background,i;for(i=this.particles.length-1;i>=0;i--){particle=this.particles[i];startingPositionLeft=particle.$element.data('stellar-startingLeft');startingPositionTop=particle.$element.data('stellar-startingTop');this._setPosition(particle.$element,startingPositionLeft,startingPositionLeft,startingPositionTop,startingPositionTop);this.options.showElement(particle.$element);particle.$element.data('stellar-startingLeft',null).data('stellar-elementIsActive',null).data('stellar-backgroundIsActive',null);}
for(i=this.backgrounds.length-1;i>=0;i--){background=this.backgrounds[i];background.$element.data('stellar-backgroundStartingLeft',null).data('stellar-backgroundStartingTop',null);setBackgroundPosition(background.$element,background.startingValueLeft,background.startingValueTop);}},destroy:function(){this._reset();this.$scrollElement.unbind('resize.'+this.name).unbind('scroll.'+this.name);this._animationLoop=$.noop;$(window).unbind('load.'+this.name).unbind('resize.'+this.name);},_setOffsets:function(){var self=this,$window=$(window);$window.unbind('resize.horizontal-'+this.name).unbind('resize.vertical-'+this.name);if(typeof this.options.horizontalOffset==='function'){this.horizontalOffset=this.options.horizontalOffset();$window.bind('resize.horizontal-'+this.name,function(){self.horizontalOffset=self.options.horizontalOffset();});}else{this.horizontalOffset=this.options.horizontalOffset;}
if(typeof this.options.verticalOffset==='function'){this.verticalOffset=this.options.verticalOffset();$window.bind('resize.vertical-'+this.name,function(){self.verticalOffset=self.options.verticalOffset();});}else{this.verticalOffset=this.options.verticalOffset;}},_repositionElements:function(){var scrollLeft=this._getScrollLeft(),scrollTop=this._getScrollTop(),horizontalOffset,verticalOffset,particle,fixedRatioOffset,background,bgLeft,bgTop,isVisibleVertical=true,isVisibleHorizontal=true,newPositionLeft,newPositionTop,newOffsetLeft,newOffsetTop,i;if(this.currentScrollLeft===scrollLeft&&this.currentScrollTop===scrollTop&&this.currentWidth===this.viewportWidth&&this.currentHeight===this.viewportHeight){return;}else{this.currentScrollLeft=scrollLeft;this.currentScrollTop=scrollTop;this.currentWidth=this.viewportWidth;this.currentHeight=this.viewportHeight;}
for(i=this.particles.length-1;i>=0;i--){particle=this.particles[i];fixedRatioOffset=(particle.isFixed?1:0);if(this.options.horizontalScrolling){newPositionLeft=(scrollLeft+particle.horizontalOffset+this.viewportOffsetLeft+particle.startingPositionLeft-particle.startingOffsetLeft+particle.parentOffsetLeft)*-(particle.stellarRatio+fixedRatioOffset-1)+particle.startingPositionLeft;newOffsetLeft=newPositionLeft-particle.startingPositionLeft+particle.startingOffsetLeft;}else{newPositionLeft=particle.startingPositionLeft;newOffsetLeft=particle.startingOffsetLeft;}
if(this.options.verticalScrolling){newPositionTop=(scrollTop+particle.verticalOffset+this.viewportOffsetTop+particle.startingPositionTop-particle.startingOffsetTop+particle.parentOffsetTop)*-(particle.stellarRatio+fixedRatioOffset-1)+particle.startingPositionTop;newOffsetTop=newPositionTop-particle.startingPositionTop+particle.startingOffsetTop;}else{newPositionTop=particle.startingPositionTop;newOffsetTop=particle.startingOffsetTop;}
if(this.options.hideDistantElements){isVisibleHorizontal=!this.options.horizontalScrolling||newOffsetLeft+particle.width>(particle.isFixed?0:scrollLeft)&&newOffsetLeft<(particle.isFixed?0:scrollLeft)+this.viewportWidth+this.viewportOffsetLeft;isVisibleVertical=!this.options.verticalScrolling||newOffsetTop+particle.height>(particle.isFixed?0:scrollTop)&&newOffsetTop<(particle.isFixed?0:scrollTop)+this.viewportHeight+this.viewportOffsetTop;}
if(isVisibleHorizontal&&isVisibleVertical){if(particle.isHidden){this.options.showElement(particle.$element);particle.isHidden=false;}
this._setPosition(particle.$element,newPositionLeft,particle.startingPositionLeft,newPositionTop,particle.startingPositionTop);}else{if(!particle.isHidden){this.options.hideElement(particle.$element);particle.isHidden=true;}}}
for(i=this.backgrounds.length-1;i>=0;i--){background=this.backgrounds[i];fixedRatioOffset=(background.isFixed?0:1);bgLeft=(this.options.horizontalScrolling?(scrollLeft+background.horizontalOffset-this.viewportOffsetLeft-background.startingOffsetLeft+background.parentOffsetLeft-background.startingBackgroundPositionLeft)*(fixedRatioOffset-background.stellarRatio)+'px':background.startingValueLeft);bgTop=(this.options.verticalScrolling?(scrollTop+background.verticalOffset-this.viewportOffsetTop-background.startingOffsetTop+background.parentOffsetTop-background.startingBackgroundPositionTop)*(fixedRatioOffset-background.stellarRatio)+'px':background.startingValueTop);setBackgroundPosition(background.$element,bgLeft,bgTop);}},_handleScrollEvent:function(){var self=this,ticking=false;var update=function(){self._repositionElements();ticking=false;};var requestTick=function(){if(!ticking){requestAnimFrame(update);ticking=true;}};this.$scrollElement.bind('scroll.'+this.name,requestTick);requestTick();},_startAnimationLoop:function(){var self=this;this._animationLoop=function(){requestAnimFrame(self._animationLoop);self._repositionElements();};this._animationLoop();}};$.fn[pluginName]=function(options){var args=arguments;if(options===undefined||typeof options==='object'){return this.each(function(){if(!$.data(this,'plugin_'+pluginName)){$.data(this,'plugin_'+pluginName,new Plugin(this,options));}});}else if(typeof options==='string'&&options[0]!=='_'&&options!=='init'){return this.each(function(){var instance=$.data(this,'plugin_'+pluginName);if(instance instanceof Plugin&&typeof instance[options]==='function'){instance[options].apply(instance,Array.prototype.slice.call(args,1));}
if(options==='destroy'){$.data(this,'plugin_'+pluginName,null);}});}};$[pluginName]=function(options){var $window=$(window);return $window.stellar.apply($window,Array.prototype.slice.call(arguments,0));};$[pluginName].scrollProperty=scrollProperty;$[pluginName].positionProperty=positionProperty;window.Stellar=Plugin;}(jQuery,this,document));