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api:dk11:net:tatukgis.ndk.tgis_layervector.locate_tgis_point_double_boolean

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TGIS_LayerVector.Locate(TGIS_Point, double, bool) method

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

Locate a shape.

Available also on: Delphi | Java | ActiveX.

Syntax

// C#
public TGIS_Shape Locate(
  TGIS_Point _ptg,
  double _prec,
  bool _visible
);
' VisualBasic
Public Function Locate(
  ByVal _ptg As TGIS_Point,
  ByVal _prec As Double,
  ByVal _visible As Boolean
) As TGIS_Shape
// Oxygene
public
  function Locate(
    _ptg : TGIS_Point;
    _prec : Double;
    _visible : Boolean
  ) : TGIS_Shape; virtual;

Parameters

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
Double
precision /not a longer distance than/; 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 _prec units are calculated same way as _ptg
_visible bool
Boolean
if true the only visible shapes will be evaluated; shapes turned of by query of hidden will be ignored

Result

Type Description
TGIS_Shape Found shape or nil.

Remarks

Use this method to locate a shape that is closest to point _ptg but also on _prec distance. Internally it calls LocateEx method. If locate is called upon active paint operations then result could be null. But Locate and paint process are using the same vector enumerator context.

It is recommended to check InPaint property before calling this Locate.

2018/02/17 00:26