topic Re: Create graphic objects from spatialquery result features and add these to the arc in ArcObjects SDK Questions

Create graphic objects from spatialquery result features and add these to the arcmap

cynthiasinha — Thu, 19 Dec 2013 09:28:53 GMT

Hello Experts,

Hey , i am new to arcobject so need a help... I have to display those points on arcmap that lies inside the envelope.I am explainingwhat i have done so far. I have one point feature class say featureclass having (lat/lon)detail.I opened it and used one ARCGIS Snippet i.e. GetActiveviewFromArcmap() and constructed one envelope as mentioned below-:

Iactiveview pactiveview=GetActiveviewFromArcmap(m_application);
Ienvelope penvelope=new EnvelopeClass();
penvelope=pactiveview.extent;
penvelope.QueryCoord(out minx, out miny,out maxX,out maxY);

Ispatialfilter sp=New IspatialfilterClass();
sp.geometry=penvelope;
sp.geometryfield=featureclass.shapefieldname;
sp.spatialrel=esrispatialrelenum.esrispatialrelIntersects;

Ifeaturecursor fc=featureclass.Search(sp,false);

IgraphicContainer pgc;
Ielement pElement;
pElement=new MarkerElementClass();
Ipoint ppoint=new PointClass();

Ifeature feature=featurecursor.NextFeature();

while(feature!=null)
{double x=Convert.ToDouble(feature.get_value(featureclass.fields.findfield("LAT")));
double y=Convert.ToDouble(feature.get_value(featureclass.fields.findfield("LON")));
ppoint.PutCoord(x,y);
pElement.Geometry=ppoint;
ppoint.AddElement(pElement,0);
pActiveview.Refresh();
featurecursor.NextFeature();}

The problem is it is displaying only one graphic object(point) on arcmap though there are 19 features satisfying the spatial query.I want that when i click the tool all features (point)/graphic object display on map at once.

Thanks in advance

Re: Create graphic objects from spatialquery result features and add these to the arc

LeoDonahue — Thu, 19 Dec 2013 12:54:14 GMT

You need this inside your while loop, at the end.

feature=featurecursor.NextFeature();

Re: Create graphic objects from spatialquery result features and add these to the arc

cynthiasinha — Fri, 20 Dec 2013 03:52:20 GMT

Hey i tried it but still the same output.
Is there any problem with graphic container or retrieving of spatial query result.I believe i have used the right approach but not able to understand why m not getting the expected result??

Re: Create graphic objects from spatialquery result features and add these to the arc

NeilClemmons — Fri, 20 Dec 2013 12:17:51 GMT

It looks to me that your problem is that you're using the same element instance over and over inside your loop. You need to create a new element with each loop iteration.