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