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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/Layer/Grid.js
*/
/**
* Class: OpenLayers.Layer.WMS
* Instances of OpenLayers.Layer.WMS are used to display data from OGC Web
* Mapping Services. Create a new WMS layer with the <OpenLayers.Layer.WMS>
* constructor.
*
* Inherits from:
* - <OpenLayers.Layer.Grid>
*/
OpenLayers.Layer.WMS = OpenLayers.Class(OpenLayers.Layer.Grid, {
/**
* Constant: DEFAULT_PARAMS
* {Object} Hashtable of default parameter key/value pairs
*/
DEFAULT_PARAMS: { service: "WMS",
version: "1.1.1",
request: "GetMap",
styles: "",
format: "image/jpeg"
},
/**
* APIProperty: isBaseLayer
* {Boolean} Default is true for WMS layer
*/
isBaseLayer: true,
/**
* APIProperty: encodeBBOX
* {Boolean} Should the BBOX commas be encoded? The WMS spec says 'no',
* but some services want it that way. Default false.
*/
encodeBBOX: false,
/**
* APIProperty: noMagic
* {Boolean} If true, the image format will not be automagicaly switched
* from image/jpeg to image/png or image/gif when using
* TRANSPARENT=TRUE. Also isBaseLayer will not changed by the
* constructor. Default false.
*/
noMagic: false,
/**
* Property: yx
* {Object} Keys in this object are EPSG codes for which the axis order
* is to be reversed (yx instead of xy, LatLon instead of LonLat), with
* true as value. This is only relevant for WMS versions >= 1.3.0, and
* only if yx is not set in <OpenLayers.Projection.defaults> for the
* used projection.
*/
yx: {},
/**
* Constructor: OpenLayers.Layer.WMS
* Create a new WMS layer object
*
* Examples:
*
* The code below creates a simple WMS layer using the image/jpeg format.
* (code)
* var wms = new OpenLayers.Layer.WMS("NASA Global Mosaic",
* "http://wms.jpl.nasa.gov/wms.cgi",
* {layers: "modis,global_mosaic"});
* (end)
* Note the 3rd argument (params). Properties added to this object will be
* added to the WMS GetMap requests used for this layer's tiles. The only
* mandatory parameter is "layers". Other common WMS params include
* "transparent", "styles" and "format". Note that the "srs" param will
* always be ignored. Instead, it will be derived from the baseLayer's or
* map's projection.
*
* The code below creates a transparent WMS layer with additional options.
* (code)
* var wms = new OpenLayers.Layer.WMS("NASA Global Mosaic",
* "http://wms.jpl.nasa.gov/wms.cgi",
* {
* layers: "modis,global_mosaic",
* transparent: true
* }, {
* opacity: 0.5,
* singleTile: true
* });
* (end)
* Note that by default, a WMS layer is configured as baseLayer. Setting
* the "transparent" param to true will apply some magic (see <noMagic>).
* The default image format changes from image/jpeg to image/png, and the
* layer is not configured as baseLayer.
*
* Parameters:
* name - {String} A name for the layer
* url - {String} Base url for the WMS
* (e.g. http://wms.jpl.nasa.gov/wms.cgi)
* params - {Object} An object with key/value pairs representing the
* GetMap query string parameters and parameter values.
* options - {Object} Hashtable of extra options to tag onto the layer.
* These options include all properties listed above, plus the ones
* inherited from superclasses.
*/
initialize: function(name, url, params, options) {
var newArguments = [];
//uppercase params
params = OpenLayers.Util.upperCaseObject(params);
if (parseFloat(params.VERSION) >= 1.3 && !params.EXCEPTIONS) {
params.EXCEPTIONS = "INIMAGE";
}
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)
);
//layer is transparent
if (!this.noMagic && this.params.TRANSPARENT &&
this.params.TRANSPARENT.toString().toLowerCase() == "true") {
// unless explicitly set in options, make layer an overlay
if ( (options == null) || (!options.isBaseLayer) ) {
this.isBaseLayer = false;
}
// jpegs can never be transparent, so intelligently switch the
// format, depending on the browser's capabilities
if (this.params.FORMAT == "image/jpeg") {
this.params.FORMAT = OpenLayers.Util.alphaHack() ? "image/gif"
: "image/png";
}
}
},
/**
* Method: clone
* Create a clone of this layer
*
* Returns:
* {<OpenLayers.Layer.WMS>} An exact clone of this layer
*/
clone: function (obj) {
if (obj == null) {
obj = new OpenLayers.Layer.WMS(this.name,
this.url,
this.params,
this.getOptions());
}
//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;
},
/**
* APIMethod: reverseAxisOrder
* Returns true if the axis order is reversed for the WMS version and
* projection of the layer.
*
* Returns:
* {Boolean} true if the axis order is reversed, false otherwise.
*/
reverseAxisOrder: function() {
var projCode = this.projection.getCode();
return parseFloat(this.params.VERSION) >= 1.3 &&
!!(this.yx[projCode] || (OpenLayers.Projection.defaults[projCode] &&
OpenLayers.Projection.defaults[projCode].yx));
},
/**
* Method: getURL
* Return a GetMap query string for this layer
*
* Parameters:
* bounds - {<OpenLayers.Bounds>} A bounds representing the bbox for the
* request.
*
* Returns:
* {String} A string with the layer's url and parameters and also the
* passed-in bounds and appropriate tile size specified as
* parameters.
*/
getURL: function (bounds) {
bounds = this.adjustBounds(bounds);
var imageSize = this.getImageSize();
var newParams = {};
// WMS 1.3 introduced axis order
var reverseAxisOrder = this.reverseAxisOrder();
newParams.BBOX = this.encodeBBOX ?
bounds.toBBOX(null, reverseAxisOrder) :
bounds.toArray(reverseAxisOrder);
newParams.WIDTH = imageSize.w;
newParams.HEIGHT = imageSize.h;
var requestString = this.getFullRequestString(newParams);
return requestString;
},
/**
* APIMethod: mergeNewParams
* Catch changeParams and uppercase the new params to be merged in
* before calling changeParams on the super class.
*
* Once params have been changed, the tiles will be reloaded with
* the new parameters.
*
* Parameters:
* newParams - {Object} Hashtable of new params to use
*/
mergeNewParams:function(newParams) {
var upperParams = OpenLayers.Util.upperCaseObject(newParams);
var newArguments = [upperParams];
return OpenLayers.Layer.Grid.prototype.mergeNewParams.apply(this,
newArguments);
},
/**
* APIMethod: getFullRequestString
* 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.
*
* Parameters:
* newParams - {Object}
* altUrl - {String} Use this as the url instead of the layer's url
*
* Returns:
* {String}
*/
getFullRequestString:function(newParams, altUrl) {
var mapProjection = this.map.getProjectionObject();
var projectionCode = this.projection && this.projection.equals(mapProjection) ?
this.projection.getCode() :
mapProjection.getCode();
var value = (projectionCode == "none") ? null : projectionCode;
if (parseFloat(this.params.VERSION) >= 1.3) {
this.params.CRS = value;
} else {
this.params.SRS = value;
}
if (typeof this.params.TRANSPARENT == "boolean") {
newParams.TRANSPARENT = this.params.TRANSPARENT ? "TRUE" : "FALSE";
}
return OpenLayers.Layer.Grid.prototype.getFullRequestString.apply(
this, arguments);
},
CLASS_NAME: "OpenLayers.Layer.WMS"
});