jq.entry.js

/*! jq.entry / jQuery plugin - v1.0.0 - 2013-03-23
* http://NeXTs.github.com/jq.entry/
* Copyright (c) 2013 Denis Lukov; Licensed MIT */

;(function($) {

  jQuery.fn.entry = function(options) {

    options = $.extend({
      elem: jQuery(this),
      e: undefined,
      invert: false,
      namespace: 'entry',
      sides: ['up', 'right', 'down', 'left']
    }, options);

    var mouseCrossedElementsBorder = function(e, elem) {
      var w = elem.width(),
        h = elem.height(),
        pointX, pointY, offsetX, offsetY, modeLR, modeTB, direction,
        eoffsetX = (e.offsetX || e.clientX - $(e.target).offset().left + window.pageXOffset),
        eoffsetY = (e.offsetY || e.clientY - $(e.target).offset().top + window.pageYOffset);

      // Determine border point horizontaly
      if (eoffsetX < w / 2) {
        pointX = !options.invert ? options.sides[3] : options.sides[1];
        offsetX = eoffsetX;
        modeLR = 0;
      } else if (eoffsetX > w / 2 && (eoffsetX - w <= w / 2)) {
        pointX = !options.invert ? options.sides[1] : options.sides[3];
        offsetX = (eoffsetY < h / 2) ? w - eoffsetX : eoffsetX - w;
        modeLR = 1;
      }
      // Determine border point vertically
      if (eoffsetY < h / 2) {
        pointY = !options.invert ? options.sides[0] : options.sides[2];
        offsetY = eoffsetY;
        modeTB = 0;
      } else if (eoffsetY > h / 2 && (eoffsetY - h <= h / 2)) {
        pointY = !options.invert ? options.sides[2] : options.sides[0];
        offsetY = (eoffsetX < w / 2) ? h - eoffsetY : eoffsetY - h;
        modeTB = 1;
      }
      // Determine what side was closer: horizontaly or vertically
      if (modeLR == 1 && modeTB == 1) {
        direction = (offsetX > offsetY) ? pointX : pointY;
      } else if ((modeLR == 0 && modeTB == 0) || (modeLR == 1 && modeTB == 0) || (modeLR == 0 && modeTB == 1)) {
        direction = (offsetX < offsetY) ? pointX : pointY;
      }
      return direction;
    };

    if (typeof(options.e) == 'undefined')
      console.log('Entry plugin requires Event Object ')
    else
      return mouseCrossedElementsBorder(options.e, options.elem);

  };
})(jQuery);