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Viewing file: Projection.js (5.54 KB) -rw-rw-rw- Select action/file-type: (+) | (+) | (+) | Code (+) | Session (+) | (+) | SDB (+) | (+) | (+) | (+) | (+) | (+) | /* 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; }; |
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