[mapguide-users] [ZS0] Combining features

[A H]

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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> 

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