[Gvsig_english] clean polygon? Issue with layers importedfromOracle Spatial

[Juan Lucas Dominguez Rubio]

Hello,
 
If I understood it well, gvSIG does not use the clockwise/counter-clockwise rule to decide what is inside and what is outside. It inherits the so-called 'winding rule' from AWT:
 
http://developer.classpath.org/doc/java/awt/geom/GeneralPath.html
 
That's why the Oracle Spatial writer checks that the orientation respects the Oracle rule (outer ring is counter-clockwise), but does not reverse it when you add an Oracle Spatial layer to a gvSIG view (because the Oracle Spatial orientation is also valid using the winding rule).
 
Regards,
 
 
Juan Lucas Domínguez Rubio
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________________________________

De: gvsig_internacional-bounces at listserv.gva.es en nombre de Wolfgang Qual
Enviado el: mié 17/02/2010 16:06
Para: gvsig_internacional at listserv.gva.es
Asunto: Re: [Gvsig_english] clean polygon? Issue with layers importedfromOracle Spatial




Dear list,
in fact, exporting a shapefile to Oracle Spatial will result in change of
the orientation of the vertices. When re-importing that Oracle spatial layer
to shapefile (export Oracle Spatial layer to shapefile), this "oracle
spatial" orientation of vertices will remain! Is it a bug?

Best,
Wolfgang

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