ArcGIS Developer Help

IMapControlDefault.TrackCircle Method

Rubber-bands a circle on the MapControl.

[Visual Basic .NET]
Public Function TrackCircle ( _
) As IGeometry

[C#]
public IGeometry TrackCircle (
);

[C++]
HRESULT TrackCircle(
void
);

Available with ArcGIS Engine.

TrackCircle returns a geometry object that implements IPolygon.

Use the TrackCircle method within the IMapControlEvents2::OnMouseDown event to rubberband a user defined Circle. The IMapControlEvents2::OnMouseMove event will be triggered during the track, but no IMapControlEvents2::OnMouseUp event will occur. The ESC key on the keyboard can be used during the track to cancel the TrackCircle.