78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
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/**********************************************************************
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*
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* GEOS - Geometry Engine Open Source
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* http://geos.osgeo.org
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*
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* Copyright (C) 2011 Sandro Santilli <strk@kbt.io>
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* Copyright (C) 2005-2006 Refractions Research Inc.
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* Copyright (C) 2001-2002 Vivid Solutions Inc.
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU Lesser General Public Licence as published
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* by the Free Software Foundation.
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* See the COPYING file for more information.
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*
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**********************************************************************
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*
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* Last port: linearref/LinearGeometryBuilder.java r466
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*
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**********************************************************************/
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#pragma once
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#include <geos/geom/Coordinate.h>
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#include <geos/geom/Geometry.h>
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#include <geos/linearref/LinearLocation.h>
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namespace geos {
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namespace linearref { // geos::linearref
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/** \brief
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* Computes the LinearLocation of the point on a linear [Geometry](@ref geom::Geometry)
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* nearest a given [Coordinate](@ref geom::Coordinate).
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*
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* The nearest point is not necessarily unique; this class always computes
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* the nearest point closest to the start of the geometry.
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*/
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class LocationIndexOfPoint {
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private:
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const geom::Geometry* linearGeom;
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LinearLocation indexOfFromStart(const geom::CoordinateXY& inputPt, const LinearLocation* minIndex) const;
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public:
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static LinearLocation indexOf(const geom::Geometry* linearGeom, const geom::CoordinateXY& inputPt);
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static LinearLocation indexOfAfter(const geom::Geometry* linearGeom, const geom::CoordinateXY& inputPt,
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const LinearLocation* minIndex);
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LocationIndexOfPoint(const geom::Geometry* linearGeom);
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/** \brief
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* Find the nearest location along a linear [Geometry](@ref geom::Geometry)
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* to a given point.
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*
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* @param inputPt the coordinate to locate
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* @return the location of the nearest point
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*/
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LinearLocation indexOf(const geom::CoordinateXY& inputPt) const;
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/** \brief
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* Find the nearest LinearLocation along the linear [Geometry](@ref geom::Geometry)
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* to a given [Coordinate](@ref geom::Coordinate) after the specified minimum LinearLocation.
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*
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* If possible the location returned will be strictly greater than the
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* `minLocation`.
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* If this is not possible, the value returned will equal `minLocation`.
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* (An example where this is not possible is when `minLocation = [end of line]`).
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*
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* @param inputPt the coordinate to locate
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* @param minIndex the minimum location for the point location
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* @return the location of the nearest point
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*/
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LinearLocation indexOfAfter(const geom::CoordinateXY& inputPt, const LinearLocation* minIndex) const;
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};
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}
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}
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