abkfenris/gage-web

/* Copyright (c) 2010
 * @author Laurence Wheway
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 *
 * @version 1.2.0
 */
(function($) {
    jQuery.extend({
        isOnScreen: function(box, container) {
            //ensure numbers come in as intgers (not strings) and remove 'px' is it's there
            for(var i in box){box[i] = parseFloat(box[i])};
            for(var i in container){container[i] = parseFloat(container[i])};

            if(!container){
                container = {
                    left: $(window).scrollLeft(),
                    top: $(window).scrollTop(),
                    width: $(window).width(),
                    height: $(window).height()
                }
            }

            if(    box.left+box.width-container.left > 0 &&
                box.left < container.width+container.left &&
                box.top+box.height-container.top > 0 &&
                box.top < container.height+container.top
            ) return true;
            return false;
        }
    })


    jQuery.fn.isOnScreen = function (container) {
        for(var i in container){container[i] = parseFloat(container[i])};

        if(!container){
            container = {
                left: $(window).scrollLeft(),
                top: $(window).scrollTop(),
                width: $(window).width(),
                height: $(window).height()
            }
        }

        if(    $(this).offset().left+$(this).width()-container.left > 0 &&
            $(this).offset().left < container.width+container.left &&
            $(this).offset().top+$(this).height()-container.top > 0 &&
            $(this).offset().top < container.height+container.top
        ) return true;
        return false;
    }
})(jQuery);