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RE: [fdo-users] Shape file Extents

7 messages

RE: [fdo-users] Shape file Extents

Reply Threaded

Hey, that's cool...

I wonder if we should have a "Code Snippets" page on the wiki for things
like this.

Anyone have any objections? If not, I'll set one up.

Jason

-----Original Message-----
From: Shaik Esu
Subject: RE: [fdo-users] Shape file Extents

Hi All,

Here is the c#.net code to get the extents of the featureclass.

This code might help the new programmers to FDO like me.

public IPolygon GetExtents()
{
IPolygon retpolygon;
ISelectAggregates pselagree =
(ISelectAggregates)FDOConnection.CreateCommand(CommandType.CommandType_S
elec
tAggregates);

pselagree.SetFeatureClassName(System.IO.Path.GetFileNameWithoutExtension
(Ope
nedFile));
IFeatureReader FDOReader = pselagree.Execute();
FgfGeometryFactory GeoFac = new FgfGeometryFactory();

Byte[] Tmppts = FDOReader.GetGeometry("Geometry");

IGeometry Geo = GeoFac.CreateGeometryFromFgf(Tmppts);

retpolygon = (IPolygon)Geo;

return retpolygon;

}

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Jackie Ng

RE: [fdo-users] Shape file Extents

Reply Threaded

That would be wonderful. I'm sure I can pull many useful snippets out of the
FDO Toolbox code that may be of great use.

- Jackie

Jason Birch wrote:

>
> Hey, that's cool...
>
> I wonder if we should have a "Code Snippets" page on the wiki for things
> like this.
>
> Anyone have any objections? If not, I'll set one up.
>
> Jason
>
> -----Original Message-----
> From: Shaik Esu
> Subject: RE: [fdo-users] Shape file Extents
>
> Hi All,
>
> Here is the c#.net code to get the extents of the featureclass.
>
> This code might help the new programmers to FDO like me.
>
> public IPolygon GetExtents()
> {
> IPolygon retpolygon;
> ISelectAggregates pselagree =
> (ISelectAggregates)FDOConnection.CreateCommand(CommandType.CommandType_S
> elec
> tAggregates);
>
> pselagree.SetFeatureClassName(System.IO.Path.GetFileNameWithoutExtension
> (Ope
> nedFile));
> IFeatureReader FDOReader = pselagree.Execute();
> FgfGeometryFactory GeoFac = new FgfGeometryFactory();
>
> Byte[] Tmppts = FDOReader.GetGeometry("Geometry");
>
> IGeometry Geo = GeoFac.CreateGeometryFromFgf(Tmppts);
>
> retpolygon = (IPolygon)Geo;
>
> return retpolygon;
>
> }
>
> _______________________________________________
> fdo-internals mailing list
> [hidden email]
> http://lists.osgeo.org/mailman/listinfo/fdo-internals
>
>

Dan Stoica

RE: [fdo-users] Shape file Extents

Reply Threaded

As a reminder, the spatial context extents are dynamic in the SHP provider case.

Therefore you can get the extents by using GetSpatialContexts command.

Don, do you volunteer to write a snippet?

Thanks,
Dan.

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Jackie Ng
Sent: Tuesday, October 14, 2008 11:31 PM
To: [hidden email]
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

That would be wonderful. I'm sure I can pull many useful snippets out of the
FDO Toolbox code that may be of great use.

- Jackie

Jason Birch wrote:

Donald Cameron

RE: [fdo-users] Shape file Extents

Reply Threaded

Yes.
Don

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Dan Stoica
Sent: Wednesday, October 15, 2008 11:02 AM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

As a reminder, the spatial context extents are dynamic in the SHP provider case.

Therefore you can get the extents by using GetSpatialContexts command.

Don, do you volunteer to write a snippet?

Thanks,
Dan.

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Jackie Ng
Sent: Tuesday, October 14, 2008 11:31 PM
To: [hidden email]
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

That would be wonderful. I'm sure I can pull many useful snippets out of the
FDO Toolbox code that may be of great use.

- Jackie

Jason Birch wrote:

Donald Cameron

RE: [fdo-users] Shape file Extents

Reply Threaded

In reply to this post by Dan Stoica

Am I missing anything Dan?

using OSGeo.FDO.Connections;
using OSGeo.FDO.Commands.SpatialContext;
using OSGeo.FDO.Geometry;

IGetSpatialContexts getSpatialContexts = connection.CreateCommand(CommandType.CommandType_GetSpatialContexts) as IGetSpatialContexts;
ISpatialContextReader reader = getSpatialContexts.Execute();
IGeometry geom = null;
byte[] extentAsByteArr = null;
string extentAsText = null;
FgfGeometryFactory geomFactory = = new FgfGeometryFactory();
while (reader.ReadNext())
{
extentAsByteArr = reader.GetExtent();
// if extent type is dynamic and no geometries have been added
// the extent can be null
if (extentAsByteArr != null)
{
geom = geomFactory.CreateGeometryFromFgf(extentAsByteArr);
extentAsText = geom.Text;
}
else
{
extentAsText = "No extent found";
}
}

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Dan Stoica
Sent: Wednesday, October 15, 2008 11:02 AM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

As a reminder, the spatial context extents are dynamic in the SHP provider case.

Therefore you can get the extents by using GetSpatialContexts command.

Don, do you volunteer to write a snippet?

Thanks,
Dan.

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Jackie Ng
Sent: Tuesday, October 14, 2008 11:31 PM
To: [hidden email]
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

That would be wonderful. I'm sure I can pull many useful snippets out of the
FDO Toolbox code that may be of great use.

- Jackie

Jason Birch wrote:

Dan Stoica

RE: [fdo-users] Shape file Extents

Reply Threaded

Looks good, Don. Does it work?

Thanks.

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Donald Cameron
Sent: Wednesday, October 15, 2008 11:31 AM
To: 'FDO Internals Mail List'
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

Am I missing anything Dan?

using OSGeo.FDO.Connections;
using OSGeo.FDO.Commands.SpatialContext;
using OSGeo.FDO.Geometry;

IGetSpatialContexts getSpatialContexts = connection.CreateCommand(CommandType.CommandType_GetSpatialContexts) as IGetSpatialContexts;
ISpatialContextReader reader = getSpatialContexts.Execute();
IGeometry geom = null;
byte[] extentAsByteArr = null;
string extentAsText = null;
FgfGeometryFactory geomFactory = = new FgfGeometryFactory();
while (reader.ReadNext())
{
extentAsByteArr = reader.GetExtent();
// if extent type is dynamic and no geometries have been added
// the extent can be null
if (extentAsByteArr != null)
{
geom = geomFactory.CreateGeometryFromFgf(extentAsByteArr);
extentAsText = geom.Text;
}
else
{
extentAsText = "No extent found";
}
}

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Dan Stoica
Sent: Wednesday, October 15, 2008 11:02 AM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

As a reminder, the spatial context extents are dynamic in the SHP provider case.

Therefore you can get the extents by using GetSpatialContexts command.

Don, do you volunteer to write a snippet?

Thanks,
Dan.

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Jackie Ng
Sent: Tuesday, October 14, 2008 11:31 PM
To: [hidden email]
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

That would be wonderful. I'm sure I can pull many useful snippets out of the
FDO Toolbox code that may be of great use.

- Jackie

Jason Birch wrote:

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Sent from the FDO Internals mailing list archive at Nabble.com.

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Donald Cameron

RE: [fdo-users] Shape file Extents

Reply Threaded

Yes, I extracted it from a method I have been using for a while. Please let me know if you experience any trouble with it.
Thanks,
Don

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Dan Stoica
Sent: Wednesday, October 15, 2008 11:35 AM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

Looks good, Don. Does it work?

Thanks.

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Donald Cameron
Sent: Wednesday, October 15, 2008 11:31 AM
To: 'FDO Internals Mail List'
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

Am I missing anything Dan?

using OSGeo.FDO.Connections;
using OSGeo.FDO.Commands.SpatialContext;
using OSGeo.FDO.Geometry;

IGetSpatialContexts getSpatialContexts = connection.CreateCommand(CommandType.CommandType_GetSpatialContexts) as IGetSpatialContexts;
ISpatialContextReader reader = getSpatialContexts.Execute();
IGeometry geom = null;
byte[] extentAsByteArr = null;
string extentAsText = null;
FgfGeometryFactory geomFactory = = new FgfGeometryFactory();
while (reader.ReadNext())
{
extentAsByteArr = reader.GetExtent();
// if extent type is dynamic and no geometries have been added
// the extent can be null
if (extentAsByteArr != null)
{
geom = geomFactory.CreateGeometryFromFgf(extentAsByteArr);
extentAsText = geom.Text;
}
else
{
extentAsText = "No extent found";
}
}

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Dan Stoica
Sent: Wednesday, October 15, 2008 11:02 AM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

As a reminder, the spatial context extents are dynamic in the SHP provider case.

Therefore you can get the extents by using GetSpatialContexts command.

Don, do you volunteer to write a snippet?

Thanks,
Dan.

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Jackie Ng
Sent: Tuesday, October 14, 2008 11:31 PM
To: [hidden email]
Subject: RE: [fdo-internals] [fdo-users] Shape file Extents

That would be wonderful. I'm sure I can pull many useful snippets out of the
FDO Toolbox code that may be of great use.

- Jackie

Jason Birch wrote: