ok thanks, this is what i have:
MgPolygonCollection polygons = new MgPolygonCollection();
MgAgfReaderWriter geometryReaderWriter = new
MgAgfReaderWriter();
MgGeometryFactory geometryFactory;
while(featureReader.ReadNext())
{
MgByteReader temp = featureReader.GetGeometry("GEOM");
MgPolygon polygon = 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
>> }
>>
>>
>>
> _______________________________________________
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> mapguide-users@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>
>
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