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Filename : Pan.js
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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
 * full list of contributors). Published under the 2-clause BSD license.
 * See license.txt in the OpenLayers distribution or repository for the
 * full text of the license. */

/**
 * @requires OpenLayers/Control/Button.js
 */

/**
 * Class: OpenLayers.Control.Pan
 * The Pan control is a single button to pan the map in one direction. For
 * a more complete control see <OpenLayers.Control.PanPanel>.
 *
 * Inherits from:
 *  - <OpenLayers.Control>
 */
OpenLayers.Control.Pan = OpenLayers.Class(OpenLayers.Control.Button, {

    /** 
     * APIProperty: slideFactor
     * {Integer} Number of pixels by which we'll pan the map in any direction 
     *     on clicking the arrow buttons, defaults to 50.  If you want to pan
     *     by some ratio of the map dimensions, use <slideRatio> instead.
     */
    slideFactor: 50,

    /** 
     * APIProperty: slideRatio
     * {Number} The fraction of map width/height by which we'll pan the map            
     *     on clicking the arrow buttons.  Default is null.  If set, will
     *     override <slideFactor>. E.g. if slideRatio is .5, then Pan Up will
     *     pan up half the map height. 
     */
    slideRatio: null,

    /** 
     * Property: direction
     * {String} in {'North', 'South', 'East', 'West'}
     */
    direction: null,

    /**
     * Constructor: OpenLayers.Control.Pan 
     * Control which handles the panning (in any of the cardinal directions)
     *     of the map by a set px distance. 
     *
     * Parameters:
     * direction - {String} The direction this button should pan.
     * options - {Object} An optional object whose properties will be used
     *     to extend the control.
     */
    initialize: function(direction, options) {
    
        this.direction = direction;
        this.CLASS_NAME += this.direction;
        
        OpenLayers.Control.prototype.initialize.apply(this, [options]);
    },
    
    /**
     * Method: trigger
     */
    trigger: function(){
        if (this.map) {
            var getSlideFactor = OpenLayers.Function.bind(function (dim) {
                return this.slideRatio ?
                    this.map.getSize()[dim] * this.slideRatio :
                    this.slideFactor;
            }, this);
    
            switch (this.direction) {
                case OpenLayers.Control.Pan.NORTH: 
                    this.map.pan(0, -getSlideFactor("h"));
                    break;
                case OpenLayers.Control.Pan.SOUTH: 
                    this.map.pan(0, getSlideFactor("h"));
                    break;
                case OpenLayers.Control.Pan.WEST: 
                    this.map.pan(-getSlideFactor("w"), 0);
                    break;
                case OpenLayers.Control.Pan.EAST: 
                    this.map.pan(getSlideFactor("w"), 0);
                    break;
            }   
        }
    },

    CLASS_NAME: "OpenLayers.Control.Pan"
});

OpenLayers.Control.Pan.NORTH = "North";
OpenLayers.Control.Pan.SOUTH = "South";
OpenLayers.Control.Pan.EAST = "East";
OpenLayers.Control.Pan.WEST = "West";