/*

    AnythingZoomer
    a jQuery Plugin
    
    by: Chris Coyier
    http://css-tricks
    
    Version: 1.0
    
    Note: You can do whatever the heck you want with this.

*/

(function($) {

    $.anythingZoomer = {

        defaults: {
            smallArea: "#small",
            largeArea: "#large",
            zoomPort: "#overlay",
            mover: "#mover",
            expansionSize: 30,
            speedMultiplier: 1.5

        }

    }

    $.fn.extend({
        anythingZoomer: function(config) {

            var config = $.extend({}, $.anythingZoomer.defaults, config);

            var wrap = $(this);

            var smallArea = $(config.smallArea);
            var largeArea = $(config.largeArea);
            var zoomPort = $(config.zoomPort);
            var mover = $(config.mover);

            var expansionSize = config.expansionSize;
            var speedMultiplier = config.speedMultiplier;

            function setup(smallArea, largeArea, wrap, zoomPort, mover, expansionSize, speedMultiplier) {

                smallArea
                    .show();

                zoomPort
                    .fadeIn();

                mover
                    .css({
                        width: mover.data("origWidth"),
                        height: mover.data("origHeight"),
                        overflow: "hidden",
                        position: "absolute"
                    })

                wrap
                    .css({
                        width: "auto"
                    })
            		.hover(function() {
            		    mover.fadeIn();
            		})
            		.mousemove(function(e) {

            		    var x = e.pageX - smallArea.offset().left;
            		    var y = e.pageY - smallArea.offset().top;

            		    if ((x < -expansionSize) || (x > smallArea.width() + expansionSize) || (y < -expansionSize) || (y > smallArea.height() + expansionSize)) {
            		        mover.fadeOut(100);
            		    }
            		    
            		    mover.css({
            		        top: y - (mover.css("height").replace("px", "") * .5),
            		        left: x - (mover.css("width").replace("px", "") * .5)
            		    });

            		    largeArea.css({

            		        left: (-(e.pageX - smallArea.offset().left) * speedMultiplier) + expansionSize,
            		        top: (-(e.pageY - smallArea.offset().top) * speedMultiplier) + expansionSize

            		    });

            		})
            		.dblclick(function() {

            		    expand(smallArea, largeArea, wrap, zoomPort, mover, expansionSize, speedMultiplier);

            		});

            };

            function expand(smallArea, largeArea, wrap, zoomPort, mover, expansionSize, speedMultiplier) {

                smallArea
        		      .hide();

                zoomPort
        		      .hide();

                mover
        		      .fadeIn()
        		      .data("origWidth", mover.width())
        		      .data("origHeight", mover.height())
        		      .css({
        		          position: "static",
        		          height: "auto",
        		          width: "auto",
        		          overflow: "visible"
        		      });

                wrap
        		      .css({
        		          width: "100%"
        		      })
        		      .unbind()
        		      .dblclick(function() {
        		          setup(smallArea, largeArea, wrap, zoomPort, mover, expansionSize, speedMultiplier);
        		      });


                largeArea
        		      .css({
        		          left: 0,
        		          top: 0,
        		          width: largeArea.data("origWidth")
        		      });

            };

            mover
		      .data("origWidth", mover.width())
		      .data("origHeight", mover.height());

            // Because the largeArea is often hidden, the width() function returns zero, take width from CSS instead  
            largeArea
		      .data("origWidth", largeArea.css("width"));

            setup(smallArea, largeArea, wrap, zoomPort, mover, expansionSize, speedMultiplier);

            return this;

        }

    });

})(jQuery);