eep..forgot to cast it. ok thats all for now. thanks for the help.
A H wrote:
>
> ok thanks, this is what i have:
>
> MgPolygonCollection polygons = new MgPolygonCollection();
> MgAgfReaderWriter geometryReaderWriter = new
> MgAgfReaderWriter();
> MgGeometryFactory geometryFactory = new MgGeometryFactory();
>
> while(featureReader.ReadNext())
> {
> MgByteReader temp = featureReader.GetGeometry("GEOM");
> MgPolygon polygon = (MgPolygon)
> geometryReaderWriter.Read(temp);
> polygons.Add(polygon);
> }
>
> MgMultiPolygon newPolygon =
> geometryFactory.CreateMultiPolygon(polygons);
>
> MgByteReader geom = geometryReaderWriter.Write(newPolygon);
>
> but the ,MgPolygon tempPoly = geometryReaderWriter.Read(temp); part didn't
> work.
> how can i easily create a MgPolygon using MgGeometry?
>
>
>
> Kenneth Skovhede, GEOGRAF A/S wrote:
>>
>> Perhaps you are looking for a MultiPolygon object?
>> http://mapguide.osgeo.net/files/mapguide/docs/webapi/d3/dc6/class_mg_multi_polygon.html
>>
>> For creating a MultiPolygon, look here:
>> http://mapguide.osgeo.net/files/mapguide/docs/webapi/d4/d46/class_mg_geometry_factory_bcbcf723fb0d1e58dbd7e030ed34022f.html#bcbcf723fb0d1e58dbd7e030ed34022f
>>
>> If you have other objects besides polygons, you need a
>> GeometryCollection object, but that is poorly supported IMO.
>>
>> Regards, Kenneth Skovhede, GEOGRAF A/S
>>
>>
>>
>> A H skrev:
>>> this should be easy, but i'm still having trouble figuring out.
>>>
>>> i have a system that allow user to draw multiple polygons, and save the
>>> polygon into a spatial database.
>>>
>>> i have this code
>>>
>>> MgFeatureQueryOptions queryStr = new MgFeatureQueryOptions();
>>> queryStr.SetFilter("ID > 0");
>>> MgFeatureReader featureReader =
>>> polyLayer.SelectFeatures(queryStr);
>>>
>>> featureReader.ReadNext();
>>> MgByteReader geom = featureReader.GetGeometry("GEOM");
>>>
>>> MgPropertyCollection properties = new MgPropertyCollection();
>>>
>>> properties.Add(new MgInt64Property("AREA_ID", areaID));
>>> properties.Add(new MgStringProperty("AREA_NAME", areaName));
>>> properties.Add(new MgGeometryProperty(GEOM_PROPERTY, geom));
>>>
>>>
>>> but this will only get geometry of 1 of the polygons.
>>> can someone help me to modify this so that it save all the polygons into
>>> 1
>>> new area that consist of the polygons in 'geom'?
>>>
>>> i'm thinking of something like:
>>>
>>> while(featureReader.ReadNext())
>>> {
>>> // store the results into 1 geometry
>>> // read into MgByteReader
>>> }
>>>
>>>
>>>
>> _______________________________________________
>> mapguide-users mailing list
>> mapguide-users@lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>>
>>
>
>
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