[OpenLayers-Users] SphericalMercator and SRS aliases epsg:900913, epsg:3857, epsg:3785, epsg:102113

[Arnd Wippermann]

Hi,

I wouldn't restrict it to sphericalmercatoralias. I use a similiar approach
to add WMS Server, which use a different EPSG code than my map, but describe
the same projection.

Why not use options.projection to request the WMS in this projection?

OpenLayers.Layer.WMS.prototype.getFullRequestString =
function(newParams,altUrl)
{
    try{
        var projectionCode = typeof this.options.projection == 'undefined' ?
this.map.getProjection() : this.options.projection;
    }catch(err){
        var projectionCode=this.map.getProjection();
    }

    var value = (projectionCode == "none") ? null : projectionCode
    if (parseFloat(this.params.VERSION) >= 1.3) {
        this.params.CRS = value;
    } else {
        this.params.SRS = value;
    }

    return OpenLayers.Layer.Grid.prototype.getFullRequestString.apply(this,
arguments);
},

Arnd

-----Ursprüngliche Nachricht-----
Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im
Auftrag von Anne Blankert
Gesendet: Sonntag, 25. Juli 2010 13:54
An: users at openlayers.org
Betreff: Re: [OpenLayers-Users] SphericalMercator and SRS aliases
epsg:900913, epsg:3857, epsg:3785, epsg:102113


Hmm, 

I didn't test my code properly, (layers without option sphericalmercator
stopped working). The following code should do better (Version >= 1.3 not
yet tested):

// override OpenLayers.WMS.getFullRequestString class member function
OpenLayers.Layer.WMS.prototype.getFullRequestString = function(newParams,
altUrl) { 
	var projectionCode = this.map.getProjection();
	var value = (projectionCode == "none") ? null : projectionCode
	if (this.options.sphericalmercatoralias)
	{
		if(value == 'EPSG:900913' || value == 'EPSG:102113' || value
==
'EPSG:3857') { 
			value = this.options.sphericalmercatoralias; 
		} 
	} 
	if (parseFloat(this.params.VERSION) >= 1.3) {
		this.params.CRS = value;
	} else {
		this.params.SRS = value;
	}

	return
OpenLayers.Layer.Grid.prototype.getFullRequestString.apply(this,
arguments);
}


After this override, you can set a new layeroption 'sphericalmercatoralias'
to tell OpenLayers to use that instead of the default as follows: 

layer = new OpenLayers.Layer.WMS(title, url, {layers: layernames},
{sphericalmercatoralias: "EPSG:102113"}); 

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g-900913-epsg-3857-epsg-3785-epsg-102113-tp5311417p5334827.html
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