Cannot center IActiveView at IPoint in C#.NET add in

Question

I'm testing a simple portion of my add in and can't get it to center/pan to a specified point, I've included what is currently in my OnClick() method. No errors appear it just refreshes and nothing happens (10.1 SP1, C#.NET VS 2010).

IMxDocument mxdoc = ArcMap.Application.Document as IMxDocument;
IActiveView actView = mxdoc.FocusMap as IActiveView;
IPageLayout pLayout = actView as IPageLayout;
ISpatialReferenceFactory srFactory = new SpatialReferenceEnvironmentClass();
int gcsCode = (int)esriSRGeoCSType.esriSRGeoCS_NAD1983;
ISpatialReference spatRef = srFactory.CreateGeographicCoordinateSystem(gcsCode);
try
{
 IPoint point = new PointClass();
 double xCoord = 33.217918;
 double yCoord = -98.158749;
 point.PutCoords(xCoord, yCoord);
 point.Project(spatRef);
 actView.Extent.CenterAt(point);
 actView.Refresh();
}
catch (Exception ex)
{
 MessageBox.Show(ex.Message);
}

• Kirk Kuykendall: yCoord looks > 90
• cevondanady: That seems to be my next issue, no matter what projection I put it in it puts me in the Atlantic Ocean. I believe this is because it is taking me x meters from the origin but it was my understanding that a geographic coordinate system read these coordinates differently.

Answer 1

There's a few problems here. First IMxDocument.FocusMap is read only, you can't change the extent from here, use IMxDocument.ActiveView instead.

Instead of projecting your point (point.Project(spatRef);) you need to set it by using IPoint.SpatialReference (inheritied from IGeometry class): point.SpatialReference = spatRef;

I have found it better to pan an envelope rather than trying to modify with CenterAt:

IEvelope pEnv = mxdoc.ActiveView.Extent;
pEnv.CenterAt(point);
mxdoc.ActiveView.Extent = pEnv;