Pitney Bowes MapXtreme - Manual (Page 192)

Chapter 8: Working with Data
Features and Feature Collections
MapXtreme v7.1 199 Developer Guide
System.Drawing.Rectangle rect=mapControl1.Bounds;
System.Drawing.Point pt = new System.Drawing.Point(rect.Left,
rect.Top);
pt.X += rect.Width/2;
pt.Y += rect.Height/2;
DPoint dpt1 = new DPoint();
// convert center point to map coords (could use map.Center)
_map.DisplayTransform.FromDisplay(pt, out dpt1);
Distance d = MapInfo.Mapping.SearchInfoFactory.ScreenToMapDistance
(_map, 3);
SearchInfo si =MapInfo.Data.SearchInfoFactory.SearchNearest(dpt1,
_map.GetDisplayCoordSys(), d);
IResultSetFeatureCollection fc = _catalog.Search("uscty_1k", si);
MapInfo.Geometry.Point p = new
MapInfo.Geometry.Point(_map.GetDisplayCoordSys(), dpt1);
FeatureGeometry buffer = p.Buffer(d.Value, d.Unit, 20,
DistanceType.Spherical);
ShowSearchGeometry(buffer);
SelectFeatureCollection(fc);
}
finally
{
Cursor.Current = Cursors.Default;
}
}
Code Example: How to Find a Feature Containing a Point
You may also wish to perform the opposite type of search, in which you are looking for a feature that
encompasses a point. For example, for delivery planning, you may want to know in which region a
customer is located.
VB example:
Dim g As MapInfo.Geometry.FeatureGeometry = New _
MapInfo.Data.SearchInfoFactory.SearchIntersectsGeometry(g, _
MapInfo.Data.IntersectType.Geometry)
Dim irfc As MapInfo.Data.IResultSetFeatureCollection = _
MapInfo.Engine.Session.Current.Catalog.Search("british_
columbia", si)
Me.MapControl1.Map.SetView(irfc.Envelope)