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.
On writing I get a problem when I clone a feature, reproject it and then try to
write out the WKT:
var wkt_out;
var tmpgeom = feature.geometry.clone();
tmpgeom .transform(mapproj, srcproj);
wkt_out = wkt_format.write(tmpgeom );
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;
}
If I write out the WKT of the feature from the vector layer before
transforming, then read it in to a new feature (avoiding the use of clone),
then transform it and then write out the WKT it works:
var wkt_out = wkt_format.write(feature);
var tmpgeom = wkt_format.read(wkt_out);
tmpgeom.geometry.transform(mapproj,srcproj);
wkt_out = wkt_format.write(tmpgeom);
Many thanks,
Robert Sanson
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