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api:dk11:delphi:fmx.gisviewerwnd.tgis_viewerwnd.locate_tgis_point_double_boolean

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TGIS_ViewerWnd.Locate(TGIS_Point; Double; Boolean) method

DK11 for Delphi | FMX.GisViewerWnd.TGIS_ViewerWnd.Locate | Overloads | Constructors | Methods | Properties | Events

Locate a shape that is near _ptg, but is closer than _prec distance.

Available also on: Delphi VCL | .NET WinForms | .NET WPF | Java.

Syntax

// Delphi
public
  function Locate(
    const _ptg : TGIS_Point;
    const _prec : Double;
    const _visible : Boolean
  ) : TGIS_ShapeAbstract; overload;
// C++ Builder
public:
  TGIS_ShapeAbstract* Locate(
    TGIS_Point* const _ptg,
    const double _prec,
    const bool _visible
  ) /* overload */;

Parameters

Name Type Description
_ptg TGIS_Point reference point /searching point/
_prec 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; precision is express in map units
_visible Boolean if true the only visible shapes will be evaluated; shapes turned of by query of hidden will be ignored

Result

Type Description
TGIS_ShapeAbstract Located shape or nil

Remarks

To improve performance sections visibility can be used to choose layer to call its Locate method. Only visible shapes will be evaluated.

2017/10/20 18:16