[GRASS-dev] G_area_of_polygon through ctypes return 0.0

[Vaclav Petras]

Hi,

good to know. I noted this in documentation (r54720) supposing that
this is always true.

Please, try things like these note in documentation.

Vaclav

On 20 January 2013 17:42, Pietro <peter.zamb at gmail.com> wrote:
> On Sun, Jan 20, 2013 at 5:33 PM, Martin Landa <landa.martin at gmail.com> wrote:
>> Hi,
>>
>> 2013/1/20 Pietro <peter.zamb at gmail.com>:
>>> I'm not able to compute the area of a polygon using G_area_of_polygon,
>>
>> try to call before G_area_of_polygon() fn
>> G_begin_polygon_area_calculations(). It should help.
>
> Thank you Martin!
> it's working :-)
>
>>>> libgis.G_begin_polygon_area_calculations()
> 1
>>>> libgis.G_area_of_polygon(bound.c_points.contents.x,
> ...                          bound.c_points.contents.y,
> ...                          bound.c_points.contents.n_points)
> 4.0
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