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111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
/**********************************************************************
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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) 2018 Paul Ramsey <pramsey@cleverlephant.ca>
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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: algorithm/Distance.java @ 2017-09-04
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*
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**********************************************************************/
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#ifndef GEOS_ALGORITHM_DISTANCE_H
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#define GEOS_ALGORITHM_DISTANCE_H
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#include <geos/export.h>
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#include <geos/geom/Coordinate.h>
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#include <geos/geom/CoordinateSequence.h>
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namespace geos {
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namespace algorithm { // geos::algorithm
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/** \brief
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* Functions to compute distance between basic geometric structures.
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*
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* @author Martin Davis
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*
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*/
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class GEOS_DLL Distance {
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public:
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/**
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* Computes the distance from a line segment AB to a line segment CD
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*
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* Note: NON-ROBUST!
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*
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* @param A
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* a point of one line
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* @param B
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* the second point of (must be different to A)
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* @param C
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* one point of the line
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* @param D
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* another point of the line (must be different to A)
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*/
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// formerly distanceLineLine
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static double segmentToSegment(const geom::Coordinate& A,
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const geom::Coordinate& B,
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const geom::Coordinate& C,
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const geom::Coordinate& D);
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/**
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* Computes the distance from a point to a sequence of line segments.
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*
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* @param p
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* a point
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* @param seq
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* a sequence of contiguous line segments defined by their vertices
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* @return the minimum distance between the point and the line segments
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*/
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static double pointToSegmentString(const geom::Coordinate& p,
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const geom::CoordinateSequence* seq);
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/**
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* Computes the distance from a point p to a line segment AB
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*
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* Note: NON-ROBUST!
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*
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* @param p
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* the point to compute the distance for
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* @param A
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* one point of the line
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* @param B
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* another point of the line (must be different to A)
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* @return the distance from p to line segment AB
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*/
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// formerly distancePointLine
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static double pointToSegment(const geom::Coordinate& p,
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const geom::Coordinate& A,
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const geom::Coordinate& B);
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/**
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* Computes the perpendicular distance from a point p to the (infinite) line
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* containing the points AB
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*
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* @param p
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* the point to compute the distance for
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* @param A
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* one point of the line
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* @param B
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* another point of the line (must be different to A)
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* @return the distance from p to line AB
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*/
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// formerly distancePointLinePerpendicular
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static double pointToLinePerpendicular(const geom::Coordinate& p,
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const geom::Coordinate& A,
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const geom::Coordinate& B);
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};
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} // namespace geos::algorithm
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} // namespace geos
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#endif // GEOS_ALGORITHM_DISTANCE_H
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