/**
 * Interface Elements for jQuery
 * Fisheye menu
 * 
 * http://interface.eyecon.ro
 * 
 * Copyright (c) 2006 Stefan Petre
 * Dual licensed under the MIT (MIT-LICENSE.txt) 
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 */

/**
 * Build a Fisheye menu from a list of links
 *
 * @name Fisheye
 * @description Build a Fisheye menu from a list of links
 * @param Hash hash A hash of parameters
 * @option String items items selection
 * @option String container container element
 * @option Integer itemWidth the minimum width for each item
 * @option Integer maxWidth the maximum width for each item
 * @option String itemsText selection of element that contains the text for each item
 * @option Integer proximity the distance from element that make item to interact
 * @option String valign vertical alignment
 * @option String halign horizontal alignment
 *
 * @type jQuery
 * @cat Plugins/Interface
 * @author Stefan Petre
 */
jQuery.iFisheye = {

    build : function(options) {

        return this.each(
                function() {
                    var el = this;
                    el.fisheyeCfg = {
                        items : jQuery(options.items, this),
                        container: jQuery(options.container, this),
                        pos : jQuery.iUtil.getPosition(this),
                        itemWidth: options.itemWidth,
                        itemsText: options.itemsText,
                        proximity: options.proximity,
                        valign: options.valign,
                        halign: options.halign,
                        maxWidth : options.maxWidth
                    };
                    jQuery.iFisheye.positionContainer(el, 0);
                    jQuery(window).bind('resize',
                            function() {
                                el.fisheyeCfg.pos = jQuery.iUtil.getPosition(el);
                                jQuery.iFisheye.positionContainer(el, 0);
                                jQuery.iFisheye.positionItems(el);
                            });
                    jQuery.iFisheye.positionItems(el);
                    el.fisheyeCfg.items.bind('mouseover',
                            function() {
                                jQuery(el.fisheyeCfg.itemsText, this).get(0).style.display = 'block';
                            }).bind('mouseout',
                            function() {
                                jQuery(el.fisheyeCfg.itemsText, this).get(0).style.display = 'none';
                            });
                    jQuery(document).bind('mousemove',
                            function(e) {
                                var pointer = jQuery.iUtil.getPointer(e);
                                var toAdd = 0;
                                if (el.fisheyeCfg.halign && el.fisheyeCfg.halign == 'center')
                                    var posx = pointer.x - el.fisheyeCfg.pos.x - (el.offsetWidth - el.fisheyeCfg.itemWidth * el.fisheyeCfg.items.size()) / 2 - el.fisheyeCfg.itemWidth / 2;
                                else if (el.fisheyeCfg.halign && el.fisheyeCfg.halign == 'right')
                                    var posx = pointer.x - el.fisheyeCfg.pos.x - el.offsetWidth + el.fisheyeCfg.itemWidth * el.fisheyeCfg.items.size();
                                else
                                    var posx = pointer.x - el.fisheyeCfg.pos.x;
                                var posy = Math.pow(pointer.y - el.fisheyeCfg.pos.y - el.offsetHeight / 2, 2);
                                el.fisheyeCfg.items.each(
                                        function(nr) {
                                            distance = Math.sqrt(Math.pow(posx - nr * el.fisheyeCfg.itemWidth, 2) + posy);
                                            distance -= el.fisheyeCfg.itemWidth / 2;

                                            distance = distance < 0 ? 0 : distance;
                                            distance = distance > el.fisheyeCfg.proximity ? el.fisheyeCfg.proximity : distance;
                                            distance = el.fisheyeCfg.proximity - distance;

                                            extraWidth = el.fisheyeCfg.maxWidth * distance / el.fisheyeCfg.proximity;

                                            this.style.width = el.fisheyeCfg.itemWidth + extraWidth + 'px';
                                            this.style.left = el.fisheyeCfg.itemWidth * nr + toAdd + 'px';
                                            toAdd += extraWidth;
                                        });
                                jQuery.iFisheye.positionContainer(el, toAdd);
                            });
                })
    },

    positionContainer : function(el, toAdd) {
        if (el.fisheyeCfg.halign)
            if (el.fisheyeCfg.halign == 'center')
                el.fisheyeCfg.container.get(0).style.left = (el.offsetWidth - el.fisheyeCfg.itemWidth * el.fisheyeCfg.items.size()) / 2 - toAdd / 2 + 'px';
            else if (el.fisheyeCfg.halign == 'left')
                el.fisheyeCfg.container.get(0).style.left = - toAdd / el.fisheyeCfg.items.size() + 'px';
            else if (el.fisheyeCfg.halign == 'right')
                el.fisheyeCfg.container.get(0).style.left = (el.offsetWidth - el.fisheyeCfg.itemWidth * el.fisheyeCfg.items.size()) - toAdd / 2 + 'px';
        el.fisheyeCfg.container.get(0).style.width = el.fisheyeCfg.itemWidth * el.fisheyeCfg.items.size() + toAdd + 'px';
    },

    positionItems : function(el) {
        el.fisheyeCfg.items.each(
                function(nr) {
                    this.style.width = el.fisheyeCfg.itemWidth + 'px';
                    this.style.left = el.fisheyeCfg.itemWidth * nr + 'px';
                });
    }
};

jQuery.fn.Fisheye = jQuery.iFisheye.build;

function fishEffect() {
    $('#fisheye').Fisheye({
        maxWidth: 40,
        items: 'a',
        itemsText: 'span',
        container: '.fisheyeContainter',
        itemWidth: 62,
        proximity: 90,
        halign : 'left'
    })
}