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Viewing file:     Projection.js (5.54 KB)      -rw-rw-rw-

/* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for 
 * full list of contributors). Published under the Clear BSD license.  
 * See http://svn.openlayers.org/trunk/openlayers/license.txt for the
 * full text of the license. */

/**
 * @requires OpenLayers/Util.js
 */

/**
 * Class: OpenLayers.Projection
 * Class for coordinate transforms between coordinate systems.
 *     Depends on the proj4js library. If proj4js is not available, 
 *     then this is just an empty stub.
 */
OpenLayers.Projection = OpenLayers.Class({

    /**
     * Property: proj
     * {Object} Proj4js.Proj instance.
     */
    proj: null,
    
    /**
     * Property: projCode
     * {String}
     */
    projCode: null,

    /**
     * Constructor: OpenLayers.Projection
     * This class offers several methods for interacting with a wrapped 
     *     pro4js projection object. 
     *
     * Parameters:
     * projCode - {String} A string identifying the Well Known Identifier for
     *    the projection.
     * options - {Object} An optional object to set additional properties
     *     on the layer.
     *
     * Returns:
     * {<OpenLayers.Projection>} A projection object.
     */
    initialize: function(projCode, options) {
        OpenLayers.Util.extend(this, options);
        this.projCode = projCode;
        if (window.Proj4js) {
            this.proj = new Proj4js.Proj(projCode);
        }
    },
    
    /**
     * APIMethod: getCode
     * Get the string SRS code.
     *
     * Returns:
     * {String} The SRS code.
     */
    getCode: function() {
        return this.proj ? this.proj.srsCode : this.projCode;
    },
   
    /**
     * APIMethod: getUnits
     * Get the units string for the projection -- returns null if 
     *     proj4js is not available.
     *
     * Returns:
     * {String} The units abbreviation.
     */
    getUnits: function() {
        return this.proj ? this.proj.units : null;
    },

    /**
     * Method: toString
     * Convert projection to string (getCode wrapper).
     *
     * Returns:
     * {String} The projection code.
     */
    toString: function() {
        return this.getCode();
    },

    /**
     * Method: equals
     * Test equality of two projection instances.  Determines equality based
     *     soley on the projection code.
     *
     * Returns:
     * {Boolean} The two projections are equivalent.
     */
    equals: function(projection) {
        if (projection && projection.getCode) {
            return this.getCode() == projection.getCode();
        } else {
            return false;
        }    
    },

    /* Method: destroy
     * Destroy projection object.
     */
    destroy: function() {
        delete this.proj;
        delete this.projCode;
    },
    
    CLASS_NAME: "OpenLayers.Projection" 
});     

/**
 * Property: transforms
 * Transforms is an object, with from properties, each of which may
 * have a to property. This allows you to define projections without 
 * requiring support for proj4js to be included.
 *
 * This object has keys which correspond to a 'source' projection object.  The
 * keys should be strings, corresponding to the projection.getCode() value.
 * Each source projection object should have a set of destination projection
 * keys included in the object. 
 * 
 * Each value in the destination object should be a transformation function,
 * where the function is expected to be passed an object with a .x and a .y
 * property.  The function should return the object, with the .x and .y
 * transformed according to the transformation function.
 *
 * Note - Properties on this object should not be set directly.  To add a
 *     transform method to this object, use the <addTransform> method.  For an
 *     example of usage, see the OpenLayers.Layer.SphericalMercator file.
 */
OpenLayers.Projection.transforms = {};

/**
 * APIMethod: addTransform
 * Set a custom transform method between two projections.  Use this method in
 *     cases where the proj4js lib is not available or where custom projections
 *     need to be handled.
 *
 * Parameters:
 * from - {String} The code for the source projection
 * to - {String} the code for the destination projection
 * method - {Function} A function that takes a point as an argument and
 *     transforms that point from the source to the destination projection
 *     in place.  The original point should be modified.
 */
OpenLayers.Projection.addTransform = function(from, to, method) {
    if(!OpenLayers.Projection.transforms[from]) {
        OpenLayers.Projection.transforms[from] = {};
    }
    OpenLayers.Projection.transforms[from][to] = method;
};

/**
 * APIMethod: transform
 * Transform a point coordinate from one projection to another.  Note that
 *     the input point is transformed in place.
 * 
 * Parameters:
 * point - {{OpenLayers.Geometry.Point> | Object} An object with x and y
 *     properties representing coordinates in those dimensions.
 * sourceProj - {OpenLayers.Projection} Source map coordinate system
 * destProj - {OpenLayers.Projection} Destination map coordinate system
 *
 * Returns:
 * point - {object} A transformed coordinate.  The original point is modified.
 */
OpenLayers.Projection.transform = function(point, source, dest) {
    if (source.proj && dest.proj) {
        point = Proj4js.transform(source.proj, dest.proj, point);
    } else if (source && dest && 
               OpenLayers.Projection.transforms[source.getCode()] && 
               OpenLayers.Projection.transforms[source.getCode()][dest.getCode()]) {
        OpenLayers.Projection.transforms[source.getCode()][dest.getCode()](point); 
    }
    return point;
};