js/plugins/hoverdir/jquery.hoverdir.js

(function( $, undefined ) {

    /*
	 * HoverDir object.
	 */
     $.HoverDir 				= function( options, element ) {

        this.$el	= $( element );

        this._init( options );

    };

    $.HoverDir.defaults 	= {
        hoverDelay	: 0,
        reverse		: false
    };

    $.HoverDir.prototype 	= {
        _init 				: function( options ) {

            this.options 		= $.extend( true, {}, $.HoverDir.defaults, options );

            // load the events
            this._loadEvents();

        },
        _loadEvents			: function() {

            var _self = this;

            this.$el.on( 'mouseenter.hoverdir, mouseleave.hoverdir', function( event ) {

                var $el			= $(this),
                evType		= event.type,
                $hoverElem	= $el.find( 'div' ),
                direction	= _self._getDir( $el, {
                    x : event.pageX, 
                    y : event.pageY
                } ),
                hoverClasses= _self._getClasses( direction );

                $hoverElem.removeClass();

                if( evType === 'mouseenter' ) {

                    $hoverElem.hide().addClass( hoverClasses.from );

                    clearTimeout( _self.tmhover );

                    _self.tmhover	= setTimeout( function() {

                        $hoverElem.show( 0, function() {
                            $(this).addClass( 'da-animate' ).addClass( hoverClasses.to );
                        } );


                    }, _self.options.hoverDelay );

                }
                else {

                    $hoverElem.addClass( 'da-animate' );

                    clearTimeout( _self.tmhover );

                    $hoverElem.addClass( hoverClasses.from );
                    //$(this).find('a').find('div').css('display', 'none');
                }

            } );

},
        // credits : http://stackoverflow.com/a/3647634
        _getDir				: function( $el, coordinates ) {

            /** the width and height of the current div **/
            var w = $el.width(),
            h = $el.height(),

            /** calculate the x and y to get an angle to the center of the div from that x and y. **/
            /** gets the x value relative to the center of the DIV and "normalize" it **/
            x = ( coordinates.x - $el.offset().left - ( w/2 )) * ( w > h ? ( h/w ) : 1 ),
            y = ( coordinates.y - $el.offset().top  - ( h/2 )) * ( h > w ? ( w/h ) : 1 ),

            /** the angle and the direction from where the mouse came in/went out clockwise (TRBL=0123);**/
            /** first calculate the angle of the point, 
				add 180 deg to get rid of the negative values
				divide by 90 to get the quadrant
				add 3 and do a modulo by 4  to shift the quadrants to a proper clockwise TRBL (top/right/bottom/left) **/
                direction = Math.round( ( ( ( Math.atan2(y, x) * (180 / Math.PI) ) + 180 ) / 90 ) + 3 )  % 4;

                return direction;

            },
            _getClasses			: function( direction ) {

                var fromClass, toClass;

                switch( direction ) {
                    case 0:
                    // from top
                    ( !this.options.reverse ) ? fromClass = 'da-slideFromTop' : fromClass = 'da-slideFromBottom';
                    toClass		= 'da-slideTop';
                    break;
                    case 1:
                    // from right
                    ( !this.options.reverse ) ? fromClass = 'da-slideFromRight' : fromClass = 'da-slideFromLeft';
                    toClass		= 'da-slideLeft';
                    break;
                    case 2:
                    // from bottom
                    ( !this.options.reverse ) ? fromClass = 'da-slideFromBottom' : fromClass = 'da-slideFromTop';
                    toClass		= 'da-slideTop';
                    break;
                    case 3:
                    // from left
                    ( !this.options.reverse ) ? fromClass = 'da-slideFromLeft' : fromClass = 'da-slideFromRight';
                    toClass		= 'da-slideLeft';
                    break;
                };

                return {
                    from : fromClass, 
                    to: toClass
                };

            }
        };

        var logError 			= function( message ) {
            if ( this.console ) {
                console.error( message );
            }
        };

        $.fn.hoverdir			= function( options ) {

            if ( typeof options === 'string' ) {

                var args = Array.prototype.slice.call( arguments, 1 );

                this.each(function() {

                    var instance = $.data( this, 'hoverdir' );

                    if ( !instance ) {
                        logError( "cannot call methods on hoverdir prior to initialization; " +
                            "attempted to call method '" + options + "'" );
                        return;
                    }

                    if ( !$.isFunction( instance[options] ) || options.charAt(0) === "_" ) {
                        logError( "no such method '" + options + "' for hoverdir instance" );
                        return;
                    }

                    instance[ options ].apply( instance, args );

                });

            } 
            else {

                this.each(function() {

                    var instance = $.data( this, 'hoverdir' );
                    if ( !instance ) {
                        $.data( this, 'hoverdir', new $.HoverDir( options, this ) );
                    }
                });

            }

            return this;

        };

    })( jQuery );