[Gdal-dev] Expose Array Based Coordinate Transformation Methods in CoordinateTransformation (#1615)

[Ari Jolma]

Tamas Szekeres kirjoitti:
> Hi All,
>
> I had a first crack at adding CoordinateTransformation.TransformPoints
> to the SWIG interface to provide the transformation of the given
> number of points passed as arrays of coordinates.
> I've tested the code for the C# bindings and worked pretty well. If
> someone have further issues please give me a comment at:
> http://trac.osgeo.org/gdal/ticket/1615

Sorry, I'll comment here. This is from point of view of Perl bindings.

You are using typemap "double argout[ANY]" which seems to require that 
you know the ANY beforehand. The same typemap is implicitly used 
elsewhere in GCPsToGeoTransform where ANY is 6.

This case seems to require a malloc, a copy to the malloced array, and 
after the call a copy to a new Perl array, and  freeing of the malloced 
array.

I need to at least define a new typemap and that seems to mean that I 
can't use "double argout[ANY]". The new typemap could be something like 
"double *inout", but I don't know how the nCount gets set (and there are 
possibly three values for it since there are three input arrays). I'd be 
inclined to use something like "int, double *, double *, double *" 
typemap since this kind of data is easiest to keep in one 2D array in Perl.

At this point, however, I'd like to postpone implementing this method in 
the Perl bindings.

Regards,

Ari

>
> Best regards,
>
> Tamas
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