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61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
1 month ago
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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) 2019 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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#ifndef GEOS_ALGORITHM_INTERSECTION_H
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#define GEOS_ALGORITHM_INTERSECTION_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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* Computes the intersection point of two lines.
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* If the lines are parallel or collinear this case is detected
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* and <code>null</code> is returned.
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* <p>
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* In general it is not possible to accurately compute
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* the intersection point of two lines, due to
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* numerical roundoff.
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* This is particularly true when the input lines are nearly parallel.
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* This routine uses numerical conditioning on the input values
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* to ensure that the computed value should be very close to the correct value.
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*
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* @param p1 an endpoint of line 1
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* @param p2 an endpoint of line 1
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* @param q1 an endpoint of line 2
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* @param q2 an endpoint of line 2
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* @return the intersection point between the lines, if there is one,
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* or null if the lines are parallel or collinear
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*
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* @see CGAlgorithmsDD#intersection(Coordinate, Coordinate, Coordinate, Coordinate)
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*/
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class GEOS_DLL Intersection {
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public:
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static geom::Coordinate intersection(const geom::Coordinate& p1, const geom::Coordinate& p2,
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const geom::Coordinate& q1, const geom::Coordinate& q2);
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};
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} // namespace geos::algorithm
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} // namespace geos
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#endif // GEOS_ALGORITHM_INTERSECTION_H
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