/* jScale Image Scaler v1.01
* Last updated: Aug 6th, 2009: Fixed bug when "ls (largest side)" option is used
* Author: JavaScript Kit at http://www.javascriptkit.com/
* Visit http://www.javascriptkit.com/script/script2/jScale/ for full source code
*/

jQuery.jScale = {
    getnewSize: function(side, nvalue) {
        var otherside = (side == "w") ? "h" : "w"
        if (typeof nvalue == "undefined" || nvalue == null) //if this side has no explicit size set, scale it
            var newSize = this.ndimensions[otherside] * this.odimensions[side] / this.odimensions[otherside]
        else
            var newSize = (/%/.test(nvalue)) ? parseInt(nvalue) / 100 * this.odimensions[side] : parseInt(nvalue)
        this.ndimensions[side] = Math.round(newSize)
    },
    getnewDimensions: function($, imgref, setting, callback) {
        //create temporary floating image to get original image's true dimensions (in case width/height attr set)
        var $tempimg = $('<img src="' + imgref.src + '" style="position:absolute; top:0; left:0; visibility:hidden" />').prependTo('body')
        this.odimensions = { w: $tempimg.width(), h: $tempimg.height()} //get image dimensions
        var sortbysize = (this.odimensions.w > this.odimensions.h) ? ["w", "h"] : ["h", "w"] //array to determine [largerside, shorterside]
        this.ndimensions = {}
        if (typeof setting.ls != "undefined") { //if setting.ls defined
            setting[sortbysize[0]] = setting.ls //set the correct side to the longest side's value setting
            setting[sortbysize[1]] = null
        }
        var sortbyavail = (setting.w) ? ["w", "h"] : (setting.h) ? ["h", "w"] : [] //check which side to work on based on availibility (which property is set by user)
        if (sortbyavail.length > 0) {
            this.getnewSize(sortbyavail[0], setting[sortbyavail[0]]) //work on side with property that's defined for sure first
            this.getnewSize(sortbyavail[1], setting[sortbyavail[1]]) //work on side with property that may or may not be defined last
            var callbackfunc = callback || function() { }
            if (setting.speed > 0)
                $(imgref).animate({ width: this.ndimensions.w + 'px', height: this.ndimensions.h + 'px' }, setting.speed, callbackfunc)
            else {
                $(imgref).css({ width: this.ndimensions.w + 'px', height: this.ndimensions.h + 'px' })
                callbackfunc.call(imgref)
            }
        }
        $tempimg.remove()
    }
};

jQuery.fn.jScale = function(setting, callback) {
    return this.each(function() { //return jQuery obj
        var imgref = this
        if (typeof setting == "undefined" || imgref.tagName != "IMG")
            return true //skip to next matched element
        if (imgref.complete) { //account for IE not firing image.onload
            jQuery.jScale.getnewDimensions(jQuery, imgref, setting, callback)
        }
        else {
            $(this).bind('load', function() {
                jQuery.jScale.getnewDimensions(jQuery, imgref, setting, callback)
            })
        }
    })
};