/* jQuery Image Magnify script v1.0

* Last updated: July 13th, 2009. This notice must stay intact for usage 

* Author: Dynamic Drive at http://www.dynamicdrive.com/

* Visit http://www.dynamicdrive.com/ for full source code

*/



jQuery.noConflict()



jQuery.imageMagnifier={

	dsettings: {

		magnifyby: 3, //default increase factor of enlarged image

		duration: 500, //default duration of animation, in millisec

		imgopacity: 0.2 //opacify of original image when enlarged image overlays it

 	},

	cursorcss: 'url(magnify.cur), -moz-zoom-in', //Value for CSS's 'cursor' attribute, added to original image

	zIndexcounter: 100,

	imgshells: [],



	refreshoffsets:function($window, $target, warpshell){

		var $offsets=$target.offset()

		var winattrs={x:$window.scrollLeft(), y:$window.scrollTop(), w:$window.width(), h:$window.height()}

		warpshell.attrs.x=$offsets.left //update x position of original image relative to page

		warpshell.attrs.y=$offsets.top

		warpshell.newattrs.x=winattrs.x+winattrs.w/2-warpshell.newattrs.w/2

		warpshell.newattrs.y=winattrs.y+winattrs.h/2-warpshell.newattrs.h/2

		if (warpshell.newattrs.x<winattrs.x+5){ //no space to the left?

			warpshell.newattrs.x=winattrs.x+5	

		}

		else if (warpshell.newattrs.x+warpshell.newattrs.w > winattrs.x+winattrs.w){//no space to the right?

			warpshell.newattrs.x=winattrs.x+5

		}

		if (warpshell.newattrs.y<winattrs.y+5){ //no space at the top?

			warpshell.newattrs.y=winattrs.y+5

		}

	},



	magnify:function($, $target, options){

		var setting={} //create blank object to store combined settings

		var setting=jQuery.extend(setting, this.dsettings, options)

		var effectpos=this.imgshells.length

		var attrs={w:$target.outerWidth(), h:$target.outerHeight()}

		var newattrs={w:Math.round(attrs.w*setting.magnifyby), h:Math.round(attrs.h*setting.magnifyby)}

		$target.css('cursor', jQuery.imageMagnifier.cursorcss)

		var $clone=$target.clone().css({position:'absolute', left:0, top:0, visibility:'hidden', border:'1px solid gray', cursor:'pointer'}).appendTo(document.body)

		$target.add($clone).data('pos', effectpos) //save position of image

		this.imgshells.push({$target:$target, $clone:$clone, attrs:attrs, newattrs:newattrs}) //remember info about this warp image instance

		$target.bind('click.magnify', function(e){ //action when original image is clicked on

			var $this=$(this).css({opacity:setting.imgopacity})

			var imageinfo=jQuery.imageMagnifier.imgshells[$this.data('pos')]

			jQuery.imageMagnifier.refreshoffsets($(window), $this, imageinfo) //refresh offset positions of original and warped images

			var $clone=imageinfo.$clone

			$clone.stop().css({zIndex:++jQuery.imageMagnifier.zIndexcounter, left:imageinfo.attrs.x, top:imageinfo.attrs.y, width:imageinfo.attrs.w, height:imageinfo.attrs.h, opacity:0, visibility:'visible'})

			.animate({opacity:1, left:imageinfo.newattrs.x, top:imageinfo.newattrs.y, width:imageinfo.newattrs.w, height:imageinfo.newattrs.h}, setting.duration,

			function(){ //callback function after warping is complete

				//none added		

			}) //end animate

		}) //end click

		$clone.click(function(e){ //action when magnified image is clicked on

			var $this=$(this)

			var imageinfo=jQuery.imageMagnifier.imgshells[$this.data('pos')]

			jQuery.imageMagnifier.refreshoffsets($(window), imageinfo.$target, imageinfo) //refresh offset positions of original and warped images

			$this.stop().animate({opacity:0, left:imageinfo.attrs.x, top:imageinfo.attrs.y, width:imageinfo.attrs.w, height:imageinfo.attrs.h},  setting.duration,

			function(){

				$this.hide()

				imageinfo.$target.css({opacity:1}) //reveal original image

			}) //end animate

		}) //end click

	}

};



jQuery.fn.imageMagnifier=function(options){

	var $=jQuery

	return this.each(function(){ //return jQuery obj

		var $imgref=$(this)

		if (this.tagName!="IMG")

			return true //skip to next matched element

		if (parseInt($imgref.css('width'))>0 && parseInt($imgref.css('height'))>0){ //if image has explicit width/height attrs defined

			jQuery.imageMagnifier.magnify($, $imgref, options)

		}

		else if (this.complete){ //account for IE not firing image.onload

			jQuery.imageMagnifier.magnify($, $imgref, options)

		}

		else{

			$(this).bind('load', function(){

				jQuery.imageMagnifier.magnify($, $imgref, options)

			})

		}

	})

};



//** The following applies the magnify effect to images with class="magnify" and optional "data-magnifyby" and "data-magnifyduration" attrs

//** It also looks for links with attr rel="magnify[targetimageid]" and makes them togglers for that image



jQuery(document).ready(function($){

	var $targets=$('.magnify')

	$targets.each(function(i){

		var $target=$(this)

		var options={}

		if ($target.attr('data-magnifyby'))

			options.magnifyby=parseFloat($target.attr('data-magnifyby'))

		if ($target.attr('data-magnifyduration'))

			options.duration=parseInt($target.attr('data-magnifyduration'))

		$target.imageMagnifier(options)

	})

	var $triggers=$('a[rel^="magnify["]')

	$triggers.each(function(i){

		var $trigger=$(this)

		var targetid=$trigger.attr('rel').match(/\[.+\]/)[0].replace(/[\[\]']/g, '') //parse 'id' from rel='magnify[id]'

		$trigger.data('magnifyimageid', targetid)

		$trigger.click(function(e){

			$('#'+$(this).data('magnifyimageid')).trigger('click.magnify')

			e.preventDefault()

		})

	})

})