Le 29/03/2021 à 17:46, Joaquim Manuel Freire Luís a écrit :
Thanks,
Maybe add that info to the docs? By now it only says
We would definitely appreciate your contribution !
“OGR_G_GetX() Fetch the x coordinate of a point from a geometry.”
*From:*Even Rouault <even.roua...@spatialys.com>
*Sent:* Monday, March 29, 2021 4:43 PM
*To:* Joaquim Manuel Freire Luís <jl...@ualg.pt>; gdal-dev@lists.osgeo.org
*Subject:* Re: [gdal-dev] Can't access to points in a buffer returned
geometry with OGR_G_GetX
OGR_G_GetX() can only work on a Point or a LineString/LinearRing
for a polygon, you need to extract the ring first with
OGR_G_GetGeometryRef() / OGR_G_GetGeometryCount()
Even
Le 29/03/2021 à 17:26, Joaquim Manuel Freire Luís a écrit :
OK, one more from the Julia wrappers. Playing with buffers now,
and it works but I want to get the points and that fails
julia> wkt = "POINT (1198054.34 648493.09)";
julia> dbf = Gdal.buffer(Gdal.fromWKT(wkt), 500)
Geometry: POLYGON ((1198554.34 648493.09,1198553.65476738 64 ... .09))
julia> toWKT(dbf)[1:90]
"POLYGON ((1198554.34 648493.09,1198553.65476738
648466.922021879,1198551.60094768 648440.8"
The ‘toWKT()’ function calls OGR_G_ExportToWkt()
But now if I try to extract the points with OGR_G_GetX() it errors
julia> Gdal.OGR_G_GetX(dbf.ptr, 0)
ERROR 6: Incompatible geometry for operation #
ç============= ????
0.0
julia> Gdal.OGR_G_GetPointCount(dbf.ptr) # ç=============
Why so?
0
Although the toWKT() works, tat’s an ascii representation but I
want I want to access them in binary (not in WKB) to send to GMT.
Joaquim
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