[MapServer-users] Python MapScript - GEOS

[Nicol Hermann]

Thanks Seth,

You are correct. Buffer works and changing the verification line solved
the problem.

Many thanks for your help
Nicol
 

Am Donnerstag, dem 23.11.2023 um 20:08 +0100 schrieb Seth G:
> Hi,
> 
> Testing the code here and the following line: shpObjBuffer =
> shpObj.buffer( 0.0005 ) returns a valid buffered polygon:
> 
> > > > shpObjBuffer
> <mapscript.shapeObj; proxy of <Swig Object of type 'shapeObj *' at
> 0x000002740979FEA0> >
> > > > shpObjBuffer.toWKT()
> 'POLYGON ((49.9658578000000020 8.1601307999999992, 49
> 
> The buffer method [1] rerturns a new shape, so I'm not sure your
> check for a True value makes sense in this line:
> 
> > > > > if shpObjBuffer == mapscript.MS_SUCCESS:
> 
> Are you sure the buffer isn't working?
> 
> Seth
> 
> [1]
> https://mapserver.org/mapscript/mapscript-api/stub/mapscript.shapeObj.html#mapscript.shapeObj.buffer
> 
> --
> web:https://geographika.net & https://mapserverstudio.net
> twitter: @geographika
> 
> On Thu, Nov 23, 2023, at 7:16 PM, Nicol Hermann via MapServer-users
> wrote:
> > Hello all,
> > 
> > it there a way to verify that GEOS Support is properly working with
> > Python mapscript.
> > The below buffer method fails but the msGetVersion claims
> > 'SUPPORTS=GEOS'. Anything else im overlooking?
> > 
> > 
> > Python 3.9.2 (default, Feb 28 2021, 17:03:44) 
> > [GCC 10.2.1 20210110] on linux
> > Type "help", "copyright", "credits" or "license" for more
> > information.
> > > > > import mapscript
> > > > > pktObj= mapscript.pointObj( 49.9653578, 8.1601308, 100 )
> > > > > shpObj= pktObj.toShape()
> > > > > shpObjBuffer= shpObj.buffer( 0.0005 )
> > > > > if shpObjBuffer == mapscript.MS_SUCCESS:
> > ...    rectObj = shpObjBuffer['bounds']
> > ...    print( rectObj )
> > ... else:
> > ...    print('Error')
> > ... 
> > Error
> > > > > print(mapscript.msGetVersion())
> > MapServer version 8.0.1 PROJ version 7.2 GDAL version 3.2
> > OUTPUT=PNG
> > OUTPUT=JPEG SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE
> > SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER
> > SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=SOS_SERVER
> > SUPPORTS=OGCAPI_SERVER SUPPORTS=GEOS INPUT=JPEG INPUT=POSTGIS
> > INPUT=OGR
> > INPUT=GDAL INPUT=SHAPEFILE INPUT=FLATGEOBUF
> > 
> > 
> > Thanks for any help
> > 
> > Nicol
> > 
> > 
> > 
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