方法原型：
function LocateEx(const _ptg: TGIS_Point; const _prec: Double; const _uid: Integer; var _dist: Double; var _part: Integer; var _proj: TGIS_Point; const _visible: Boolean): TGIS_Shape;
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Parameters |
Description |
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const _ptg: TGIS_Point |
reference point /searching point/ in a lyer; 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 |
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const _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 |
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const _uid: Integer |
Uid of reference shape or -1; thanks to this, is possible to find nearest shape, excluding shape given by _uid. |
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var _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 |
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var _part: Integer |
number of the part closest to a given point |
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var _proj: TGIS_Point |
point projected to the nearest element of a shape |
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const _visible: Boolean |
if true the only visible shapes will be evaluated; shapes turned of by query of hidden will be ignored |