/// <summary>
/// Selects all of the features whose centroids lie within a given polygon.
/// </summary>
/// <remarks>This method searches for all features whose centroids are within the given polygon and updates the
/// default selection.</remarks>
/// <param name="mapAlias">MapAlias of the map.</param>
/// <param name="points">Array of points forming the polygon.</param>
public virtual void PolygonSelection(string mapAlias, System.Drawing.Point[] points)
{
Map map = GetMapObj(mapAlias);
// Convert them to map coordinates
MapInfo.Geometry.DPoint [] dpnts = new MapInfo.Geometry.DPoint[points.Length];
for (int indx = 0; indx < points.Length; indx++)
{
map.DisplayTransform.FromDisplay(points[indx], out dpnts[indx]);
}
// Create a polygon from these points
CoordSys dispCSys = map.GetDisplayCoordSys();
CoordSys geomCSys =
Session.Current.CoordSysFactory.CreateCoordSys(dispCSys.Type, dispCSys.Datum, dispCSys.Units, dispCSys.OriginLongitude, dispCSys.OriginLatitude, dispCSys.StandardParallelOne, dispCSys.StandardParallelTwo, dispCSys.Azimuth, dispCSys.ScaleFactor, dispCSys.FalseEasting, dispCSys.FalseNorthing, dispCSys.Range, map.Layers.Bounds, dispCSys.AffineTransform);
MapInfo.Geometry.MultiPolygon mp = new MapInfo.Geometry.MultiPolygon(geomCSys, MapInfo.Geometry.CurveSegmentType.Linear, dpnts);
// Search and select
SearchInfo si = MapInfo.Data.SearchInfoFactory.SearchWithinGeometry(mp, ContainsType.Centroid);
Session.Current.Selections.DefaultSelection.Clear();
IMapLayerFilter _selFilter = MapLayerFilterFactory.FilterForTools(
map, MapLayerFilterFactory.FilterByLayerType(LayerType.Normal), MapLayerFilterFactory.FilterVisibleLayers(true),
"MapInfo.Tools.MapToolsDefault.SelectLayers", null);
ITableEnumerator table = map.Layers.GetTableEnumerator(_selFilter);
if (table != null) // null will be returned is select enabled layer is not visible, thus non-selectable
{
Session.Current.Catalog.Search(table, si, Session.Current.Selections.DefaultSelection, ResultSetCombineMode.AddTo);
}
}
// this is similar to searchwithinscreenrect, but the rect constructed is a map rectangle
// as opposed to a screen rectangle (try both and see the difference)
private void menuItemSearchWithinRect_Click(object sender, System.EventArgs e)
{
try
{
Cursor.Current = Cursors.WaitCursor;
System.Drawing.Rectangle rect = mapControl1.Bounds;
rect.X += rect.Width / 3;
rect.Width = rect.Width / 3;
rect.Y += rect.Height / 3;
rect.Height = rect.Height / 3;
DRect mapRect = new DRect();
// use csys and transform of feature layer, because that is the
// layer we are doing the search on
FeatureLayer layer = _map.Layers["uscty_1k"] as FeatureLayer;
layer.DisplayTransform.FromDisplay(rect, out mapRect);
SearchInfo si = MapInfo.Data.SearchInfoFactory.SearchWithinRect(mapRect, layer.CoordSys, ContainsType.Centroid);
IResultSetFeatureCollection fc = _catalog.Search(layer.Table, si);
// show search geometry on screen for visual confirmation
DPoint [] pts = new DPoint[4];
mapRect.GetCornersOfRect(pts);
FeatureGeometry g = new MapInfo.Geometry.MultiPolygon(layer.CoordSys, CurveSegmentType.Linear, pts);
ShowSearchGeometry(g);
SelectFeatureCollection(fc);
}
finally
{
Cursor.Current = Cursors.Default;
}
}
// find cities nearest to center within 3 pixel radius
private void menuItemMapSearchNearest_Click(object sender, System.EventArgs e)
{
try
{
Cursor.Current = Cursors.WaitCursor;
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;
SearchInfo si = MapInfo.Mapping.SearchInfoFactory.SearchNearest(_map, pt, 3);
IResultSetFeatureCollection fc = _catalog.Search("uscty_1k", si);
rect.X = pt.X;
rect.Y = pt.Y;
rect.Width = 0;
rect.Height = 0;
rect.Inflate(3, 3);
// show search geometry on screen for visual confirmation
MapInfo.Geometry.MultiPolygon p = MapInfo.Mapping.SearchInfoFactory.CreateScreenRect(_map, rect);
ShowSearchGeometry(p);
SelectFeatureCollection(fc);
}
finally
{
Cursor.Current = Cursors.Default;
}
}
// find cities with 1/3 radius of center
private void menuItemMapSearchWithinScreenRadius_Click(object sender, System.EventArgs e)
{
try
{
Cursor.Current = Cursors.WaitCursor;
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;
SearchInfo si = MapInfo.Mapping.SearchInfoFactory.SearchWithinScreenRadius(_map, pt, rect.Width / 6, 20, ContainsType.Centroid);
IResultSetFeatureCollection fc = _catalog.Search("uscty_1k", si);
// show search geometry on screen for visual confirmation
MapInfo.Geometry.MultiPolygon p = MapInfo.Mapping.SearchInfoFactory.CreateScreenCircle(_map.Layers["temp"] as FeatureLayer, pt, rect.Width / 6, 20);
ShowSearchGeometry(p);
SelectFeatureCollection(fc);
}
finally
{
Cursor.Current = Cursors.Default;
}
}
// this is similar to searchwithinscreenrect, but the rect constructed is a map rectangle
// as opposed to a screen rectangle (try both and see the difference)
private void menuItemSearchWithinRect_Click(object sender, System.EventArgs e)
{
try
{
Cursor.Current = Cursors.WaitCursor;
System.Drawing.Rectangle rect=mapControl1.Bounds;
rect.X += rect.Width/3;
rect.Width = rect.Width/3;
rect.Y += rect.Height/3;
rect.Height = rect.Height/3;
DRect mapRect=new DRect();
// use csys and transform of feature layer, because that is the
// layer we are doing the search on
FeatureLayer layer = _map.Layers["uscty_1k"] as FeatureLayer;
layer.DisplayTransform.FromDisplay(rect, out mapRect);
SearchInfo si = MapInfo.Data.SearchInfoFactory.SearchWithinRect(mapRect, layer.CoordSys, ContainsType.Centroid);
IResultSetFeatureCollection fc = _catalog.Search(layer.Table, si);
// show search geometry on screen for visual confirmation
DPoint []pts = new DPoint[4];
mapRect.GetCornersOfRect(pts);
FeatureGeometry g = new MapInfo.Geometry.MultiPolygon(layer.CoordSys, CurveSegmentType.Linear, pts);
ShowSearchGeometry(g);
SelectFeatureCollection(fc);
}
finally
{
Cursor.Current = Cursors.Default;
}
}
