[OpenLayers-Users] Problem with WKT reader not reading cloned geometry

[Robert Sanson]

Hi

I have a Web mapping app built with OL 2.13.1

Vector data is read in from a database source as WKT. I have to transform from a source projection to a map projection once read into a vector feature, before adding to a vector layer, and then transform back to the source projection when writing out new features or edits back to the database.

My WKT format is defined as:

var wkt_format = new OpenLayers.Format.WKT();

I read my features as:

featgeom = wkt_format.read(crds);
if (srcsrs != mapsrs) {
          featgeom.geometry.transform(srcproj,mapproj);
}

This works fine.

On writing I get a problem when I clone a feature, reproject it and then try to write out the WKT:

var wkt_out;
      if (srcsrs != mapsrs) {
        var geometry = feature.geometry.clone();
        geometry.transform(mapproj, srcproj);
        wkt_out = wkt_format.write(geometry);
      }
      else {
        wkt_out = wkt_format.write(feature);
      }

I get an error: 

'CLASS_NAME' is null or not an object
WKT.js


Looking in WKT.js it appears the clone is not copying the type of geometry?

/**
     * Method: extractGeometry
     * Entry point to construct the WKT for a single Geometry object.
     *
     * Parameters:
     * geometry - {<OpenLayers.Geometry.Geometry>}
     *
     * Returns:
     * {String} A WKT string of representing the geometry
     */
    extractGeometry: function(geometry) {
        var type = geometry.CLASS_NAME.split('.')[2].toLowerCase();
        if (!this.extract[type]) {
            return null;
        }
        if (this.internalProjection && this.externalProjection) {
            geometry = geometry.clone();
            geometry.transform(this.internalProjection, this.externalProjection);
        }                       
        var wktType = type == 'collection' ? 'GEOMETRYCOLLECTION' : type.toUpperCase();
        var data = wktType + '(' + this.extract[type].apply(this, [geometry]) + ')';
        return data;
    }

Any clues how to solve this?

Many thanks,

Robert Sanson




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