[Gdal-dev] OGR: how to get length of line-features

[Frank Warmerdam]

J.F wrote:
> Hi ,
>  
> I'm trying to get length of line-features from a TAb file using ogr,but
>  
> OGRGeometry does not support the method get_Length().
>  
> How can I get it when  I'm reading ?

JF,

If you are using the C++ API, and you know that a particular
geometry is a linestring or linearring you can just explicitly
cast the OGRGeometry* to OGRLineString and then call get_Length()
on it.

eg.
  if( wkbFlatten(poGeometry->geGeometryType() == wkbLineString )
    printf( "Length = %g\n",
              ((OGRLineString *) poGeometry))->get_Length() );

I see get_Length() is implemented in 1.4 branch, but I'm not sure
how long it has existed in OGR.

Best regards,
-- 
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