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TGIS_LayerVector.LocateEx(TGIS_Point, double, long, double, int, TGIS_Point) method

DK11 for .NET | TatukGIS.NDK.TGIS_LayerVector.LocateEx | Overloads | Constructors | Fields | Methods | Properties | Events

Locates a shape (more precise).

Available also on: Delphi | Java | ActiveX.


// C#
public TGIS_Shape LocateEx(
  TGIS_Point _ptg,
  double _prec,
  long _uid,
  ref double _dist,
  ref int _part,
  ref TGIS_Point _proj
' VisualBasic
Public Function LocateEx(
  ByVal _ptg As TGIS_Point,
  ByVal _prec As Double,
  ByVal _uid As Long,
  ByRef _dist As Double,
  ByRef _part As Integer,
  ByRef _proj As TGIS_Point
) As TGIS_Shape
// Oxygene
  function LocateEx(
    _ptg : TGIS_Point;
    _prec : Double;
    _uid : TGIS_Uid;
    var _dist : Double;
    var _part : Integer;
    var _proj : TGIS_Point
  ) : TGIS_Shape; virtual;


Name Type Description
_ptg TGIS_Point reference point /searching point/ if the layer has been attached to the Viewer then expected _ptg units are in a Viewer coordinate space; otherwise expected _ptg units are in a Layer coordinate space
_prec double
precision /not a longer distance than/; point inside a polygon is always not greater than _dist; if _prec is less then 0, then being outside/inside polygon means the same _prec units are calculated same way as _ptg
_uid long
Uid of reference shape or -1; thanks to this, is possible to find nearest shape, excluding shape given by _uid.
_dist double
reached distance between _pt and shape in Result; for points inside the polygon (if _prec >= 0) the distance will be multiply by 0.95 (to prefer points inside the polygon) but will not be bigger then _prec; for point distance will be multiplied by 0.9 to prefer points over lines and polygons _dist units are calculated same way as _ptg
_part int
number of the part closest to a given point
_proj TGIS_Point point projected to the nearest element of a shape


Type Description
TGIS_Shape Found shape or nil.


Use this method to locate a shape that is near _ptg but also on _prec distance. It finds a shape using FindFirst method in extent corrected by _prec and _ptg params.

See Locate for example.

If no shape is found on a layer, the searcher takes into account labels registered by the allocator (by extent). In order to disable this behavior, _visible must be set to False.

2020/05/07 01:18

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