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List: fdo-users
Subject: [fdo-users] Creating a spatial filter
From: simonh () geobiz ! co ! nz (simon hope)
Date: 2007-12-10 14:46:51
Message-ID: 14260123.post () talk ! nabble ! com
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So far I've been using the windows binaries only - I'm assuming the unit
tests are part of the source packages.
Simon
Dan Stoica wrote:
>
> In general when in doubt or looking for snippets, your best bet is the
> unit tests. At least this is my approach :-)
>
> Dan.
>
> -----Original Message-----
> From: fdo-users-bounces@lists.osgeo.org
> [mailto:fdo-users-bounces@lists.osgeo.org] On Behalf Of simon hope
> Sent: Sunday, December 09, 2007 3:08 PM
> To: fdo-users@lists.osgeo.org
> Subject: RE: [fdo-users] Creating a spatial filter
>
>
> Gavin,
>
> Thanks for the advice that worked - here is the code for completeness:
>
> //set the geometry fields
> qryPropName = new OSGeo.FDO.Expression.Identifier("shape");
>
> //create a geometry from a poly
> poly =
> (OSGeo.FDO.Geometry.IPolygon)geomFactory.CreateGeometry("POLYGON((176954.045
> 5914119.79, 1769564.823 5914473.302, 1770089.64 5914474.08, 1770091.198
> 5914117.454, 176954.045 5914119.79))");
> geom = geomFactory.CreateGeometry(poly);
>
> //create the byte array required to create the expression
> byteArray = geomFactory.GetFgf(geom);
> OSGeo.FDO.Expression.GeometryValue qryGeomVal = new
> OSGeo.FDO.Expression.GeometryValue(byteArray);
>
> //create the filter
> OSGeo.FDO.Filter.Filter fltr;
> fltr = new OSGeo.FDO.Filter.SpatialCondition(qryPropName,
> OSGeo.FDO.Filter.SpatialOperations.SpatialOperations_Intersects,
> qryGeomVal);
>
> //set the filter on the query command
> qrySelect.SetFilter(fltr.ToString());
>
> Cheers
>
> Simon
>
>
> Gavin Cramer wrote:
> >
> > Hi, Simon. Instead of GetWkb, use GetFgf. FGF is the binary storage
> > format for FDO geometries.
> >
> > Gavin
> >
> >
> > -----Original Message-----
> > From: fdo-users-bounces@lists.osgeo.org
> > [mailto:fdo-users-bounces@lists.osgeo.org] On Behalf Of simon hope
> > Sent: Tuesday, December 04, 2007 9:44 PM
> > To: fdo-users@lists.osgeo.org
> > Subject: RE: [fdo-users] Creating a spatial filter
> >
> >
> > Hi Dan,
> >
> > I tried the following:
> >
> > //set the geometry fields
> > qryPropName = new OSGeo.FDO.Expression.Identifier("shape");
> >
> > //create a geometry from a poly
> > poly =
> > (OSGeo.FDO.Geometry.IPolygon)geomFactory.CreateGeometry("POLYGON((176954.045
> > 5914119.79, 1769564.823 5914473.302, 1770089.64 5914474.08, 1770091.198
> > 5914117.454, 176954.045 5914119.79))");
> > geom = geomFactory.CreateGeometry(poly);
> >
> > //create the byte array required to create the expression
> > byteArray = geomFactory.GetWkb(geom);
> > OSGeo.FDO.Expression.GeometryValue qryGeomVal = new
> > OSGeo.FDO.Expression.GeometryValue(byteArray);
> >
> > //create the filter
> > OSGeo.FDO.Filter.Filter fltr;
> > fltr = new OSGeo.FDO.Filter.SpatialCondition(qryPropName,
> > OSGeo.FDO.Filter.SpatialOperations.SpatialOperations_Intersects,
> > qryGeomVal);
> >
> > //set the filter on the query command
> > qrySelect.SetFilter(fltr.ToString());
> >
> > And I get the same issue - I also tried creating the byteArray directly
> > from
> > the poly object i.e.
> >
> > byteArray = geomFactory.GetWkb(poly);
> >
> > But i get the same message - is it advisable to use this method to create
> > polygons? i.e from a WKT or is it better to use LinearRings?
> >
> > Cheers
> >
> > Simon
> >
> >
> > Dan Stoica wrote:
> > >
> > > Hi,
> > >
> > > Use a IPolygon instead of IEnvelope.
> > >
> > > Dan.
> > >
> > > -----Original Message-----
> > > From: fdo-users-bounces@lists.osgeo.org
> > > [mailto:fdo-users-bounces@lists.osgeo.org] On Behalf Of simon hope
> > > Sent: Tuesday, December 04, 2007 2:08 AM
> > > To: fdo-users@lists.osgeo.org
> > > Subject: [fdo-users] Creating a spatial filter
> > >
> > >
> > > Hello,
> > >
> > > I'm attempting to create a spatial filter against an SDE FeatureClass.
> > > I'm
> > > hitting a problem with the code below:
> > >
> > > byte[] byteArray;
> > > OSGeo.FDO.Geometry.IGeometry geom;
> > > OSGeo.FDO.Geometry.IEnvelope env;
> > > OSGeo.FDO.Geometry.FgfGeometryFactory geomFactory = new
> > > OSGeo.FDO.Geometry.FgfGeometryFactory();
> > > OSGeo.FDO.Expression.Identifier qryPropName;
> > >
> > > try
> > > {
> > >
> > > //set the geometry fields
> > > qryPropName = new OSGeo.FDO.Expression.Identifier("shape");
> > >
> > > //create a geometry from an envelope
> > > env =
> > > geomFactory.CreateEnvelopeXY(1765068.119,5916635.233,1765756.4,5917101.847);
> > > geom = geomFactory.CreateGeometry(env);
> > >
> > > //create the byte array required to create the expression
> > > byteArray = geomFactory.GetWkb(geom);
> > > OSGeo.FDO.Expression.GeometryValue qryGeomVal = new
> > > OSGeo.FDO.Expression.GeometryValue(byteArray);
> > >
> > > //create the filter
> > > OSGeo.FDO.Filter.Filter fltr;
> > > fltr = new OSGeo.FDO.Filter.SpatialCondition(qryPropName,
> > > OSGeo.FDO.Filter.SpatialOperations.SpatialOperations_Intersects,
> > > qryGeomVal);
> > >
> > > //set the filter on the query command
> > > qrySelect.SetFilter(fltr.ToString());
> > >
> > > }
> > > catch (Exception ex)
> > > {
> > > throw new Exception(ex.ToString());
> > > }
> > > finally
> > > {
> > > //todo clean up
> > > }
> > >
> > > the code falls over when i try and SetFilter - giving me an error:
> > > {"'FdoFgfGeometryFactory::CreateGeometryFromFgf': Unknown geometry type
> > > '769' discovered. "}
> > >
> > > I've managed to create attribute filters, and have tried to follow that
> > > pattern for a spatial filter - should I be creating a specific geometry
> > > type?
> > >
> > > Any ideas?
> > >
> > > Cheers
> > >
> > > Simon
> > > --
> > > View this message in context:
> > > http://www.nabble.com/Creating-a-spatial-filter-tf4941500s18162.html#a14145736
> > > Sent from the fdo-users mailing list archive at Nabble.com.
> > >
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> > >
> > >
> >
> > --
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> > http://www.nabble.com/Creating-a-spatial-filter-tf4941500s18162.html#a14164229
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> >
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>
> --
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> Sent from the fdo-users mailing list archive at Nabble.com.
>
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--
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