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/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
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* text of the license. */
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/**
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* @class
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*
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* @requires OpenLayers/Layer/Grid.js
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*/
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OpenLayers.Layer.WMS = Class.create();
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OpenLayers.Layer.WMS.prototype =
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Object.extend( new OpenLayers.Layer.Grid(), {
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/** Hashtable of default parameter key/value pairs
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* @final @type Object */
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DEFAULT_PARAMS: { service: "WMS",
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version: "1.1.1",
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request: "GetMap",
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styles: "",
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exceptions: "application/vnd.ogc.se_inimage",
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format: "image/jpeg"
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},
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/** @type Boolean */
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isBaseLayer: null,
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/**
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* @constructor
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*
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* @param {String} name
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* @param {String} url
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* @param {Object} params
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* @param {Object} options Hashtable of extra options to tag onto the layer
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*/
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initialize: function(name, url, params, options) {
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var newArguments = new Array();
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if (arguments.length > 0) {
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//uppercase params
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params = OpenLayers.Util.upperCaseObject(params);
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newArguments.push(name, url, params, options);
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}
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OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments);
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if (arguments.length > 0) {
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OpenLayers.Util.applyDefaults(
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this.params,
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OpenLayers.Util.upperCaseObject(this.DEFAULT_PARAMS)
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);
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}
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// if the layer is transparent, it will be an overlay
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this.isBaseLayer = ((this.params.TRANSPARENT != "true") &&
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(this.params.TRANSPARENT != true));
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},
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/**
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*
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*/
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destroy: function() {
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// for now, nothing special to do here.
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OpenLayers.Layer.Grid.prototype.destroy.apply(this, arguments);
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},
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/**
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* @param {Object} obj
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*
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* @returns An exact clone of this OpenLayers.Layer.WMS
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* @type OpenLayers.Layer.WMS
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*/
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clone: function (obj) {
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if (obj == null) {
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obj = new OpenLayers.Layer.WMS(this.name,
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this.url,
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this.params,
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this.options);
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}
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//get all additions from superclasses
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obj = OpenLayers.Layer.Grid.prototype.clone.apply(this, [obj]);
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// copy/set any non-init, non-simple values here
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return obj;
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},
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/**
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* @param {OpenLayers.Bounds} bounds
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*
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* @returns A string with the layer's url and parameters and also the
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* passed-in bounds and appropriate tile size specified as
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* parameters
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* @type String
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*/
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getURL: function (bounds) {
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return this.getFullRequestString(
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{BBOX:bounds.toBBOX(),
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WIDTH:this.tileSize.w,
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HEIGHT:this.tileSize.h});
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},
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/**
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* addTile creates a tile, initializes it, and
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* adds it to the layer div.
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*
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* @param {OpenLayers.Bounds} bounds
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*
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* @returns The added OpenLayers.Tile.Image
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* @type OpenLayers.Tile.Image
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*/
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addTile:function(bounds,position) {
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url = this.getURL(bounds);
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return new OpenLayers.Tile.Image(this, position, bounds,
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url, this.tileSize);
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},
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/**
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* Catch changeParams and uppercase the new params to be merged in
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* before calling changeParams on the super class.
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*
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* Once params have been changed, we will need to re-init our tiles
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*
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* @param {Object} newParams Hashtable of new params to use
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*/
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mergeNewParams:function(newParams) {
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var upperParams = OpenLayers.Util.upperCaseObject(newParams);
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var newArguments = [upperParams];
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OpenLayers.Layer.Grid.prototype.mergeNewParams.apply(this,
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newArguments);
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if (this.map != null) {
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this._initTiles();
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}
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},
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/** combine the layer's url with its params and these newParams.
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*
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* Add the SRS parameter from getProjection() -- this is probably
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* more eloquently done via a setProjection() method, but this
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* works for now and always.
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*
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* @param {Object} newParams
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*
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* @type String
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*/
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getFullRequestString:function(newParams) {
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var projection = this.map.getProjection();
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this.params.SRS = (projection == "none") ? null : projection;
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return OpenLayers.Layer.Grid.prototype.getFullRequestString.apply(
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this, arguments);
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Layer.WMS"
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});
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