api:dk11:delphi:gisinterfaces.igis_viewer.locate_tgis_point_double
Table of Contents
IGIS_Viewer.Locate(TGIS_Point; Double) method
DK11 for Delphi | GisInterfaces.IGIS_Viewer.Locate | Overloads | Methods | Properties
Locate a shape that is near _ptg, but is closer than _prec distance.
Syntax
// Delphi public function Locate( const _ptg : TGIS_Point; const _prec : Double ) : TGIS_ShapeAbstract; overload;
// C++ Builder public: TGIS_ShapeAbstract* Locate( TGIS_Point* const _ptg, const double _prec ) = 0 /* 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 |
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.
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.
2022/11/16 01:17