/* jQuery Image Magnify script v1.1
* This notice must stay intact for usage 
* Author: Dynamic Drive at http://www.dynamicdrive.com/
* Visit http://www.dynamicdrive.com/ for full source code

* Nov 16th, 09 (v1.1): Adds ability to dynamically apply/reapply magnify effect to an image, plus magnify to a specific width in pixels.
*/

jQuery.noConflict()

jQuery.imageMagnify = {
    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,

    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 attrs = (options.thumbdimensions) ? { w: options.thumbdimensions[0], h: options.thumbdimensions[1]} : { w: $target.outerWidth(), h: $target.outerHeight() }
        var newattrs = {}
        newattrs.w = (setting.magnifyto) ? setting.magnifyto : Math.round(attrs.w * setting.magnifyby)
        newattrs.h = (setting.magnifyto) ? Math.round(attrs.h * newattrs.w / attrs.w) : Math.round(attrs.h * setting.magnifyby)
        $target.css('cursor', jQuery.imageMagnify.cursorcss)
        if ($target.data('imgshell')) {
            $target.data('imgshell').$clone.remove()
            $target.css({ opacity: 1 }).unbind('click.magnify')
        }
        var $clone = $target.clone().css({ position: 'absolute', left: 0, top: 0, visibility: 'hidden', border: '1px solid gray', cursor: 'pointer' }).appendTo(document.body)
        $clone.data('$relatedtarget', $target) //save $target image this enlarged image is associated with
        $target.data('imgshell', { $clone: $clone, attrs: attrs, newattrs: newattrs })
        $target.bind('click.magnify', function(e) { //action when original image is clicked on
            var $this = $(this).css({ opacity: setting.imgopacity })
            var imageinfo = $this.data('imgshell')
            jQuery.imageMagnify.refreshoffsets($(window), $this, imageinfo) //refresh offset positions of original and warped images
            var $clone = imageinfo.$clone
            $clone.stop().css({ zIndex: ++jQuery.imageMagnify.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 = $this.data('$relatedtarget').data('imgshell')
            jQuery.imageMagnify.refreshoffsets($(window), $this.data('$relatedtarget'), 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()
			    $this.data('$relatedtarget').css({ opacity: 1 }) //reveal original image
			}) //end animate
        }) //end click
    }
};

jQuery.fn.imageMagnify = 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($imgref.css('height')) > 0 || options.thumbdimensions) { //if image has explicit width/height attrs defined
            jQuery.imageMagnify.magnify($, $imgref, options)
        }
        else if (this.complete) { //account for IE not firing image.onload
            jQuery.imageMagnify.magnify($, $imgref, options)
        }
        else {
            $(this).bind('load', function() {
                jQuery.imageMagnify.magnify($, $imgref, options)
            })
        }
    })
};

jQuery.fn.applyMagnifier = function(options) { //dynamic version of imageMagnify() to apply magnify effect to an image dynamically
    var $ = jQuery
    return this.each(function() { //return jQuery obj
        var $imgref = $(this)
        if (this.tagName != "IMG")
            return true //skip to next matched element

    })

};


//** 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-magnifyto'))
            options.magnifyto = parseFloat($target.attr('data-magnifyto'))
        if ($target.attr('data-magnifyby'))
            options.magnifyby = parseFloat($target.attr('data-magnifyby'))
        if ($target.attr('data-magnifyduration'))
            options.duration = parseInt($target.attr('data-magnifyduration'))
        $target.imageMagnify(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()
        })
    })
})