lseg.h

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/*                        L S E G . H
 * BRL-CAD
 *
 * Copyright (c) 2004-2025 United States Government as represented by
 * the U.S. Army Research Laboratory.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * version 2.1 as published by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this file; see the file named COPYING for more
 * information.
 */
 
/*----------------------------------------------------------------------*/
/* @file lseg.h */
/** @addtogroup bg_lseg */
/** @{ */
 
/**
 *  @brief Functions for working with line segments
 */
 
#ifndef BG_LSEG_H
#define BG_LSEG_H
 
#include "common.h"
#include "vmath.h"
#include "bg/defines.h"
 
__BEGIN_DECLS
 
/* Compute the closest point on the line segment P0->P1 to point Q.  Returns
 * the distance squared from Q to the closest point and the closest point in
 * question if c is non-NULL.
 */
BG_EXPORT double
bg_distsq_lseg3_pt(point_t *c, const point_t P0, const point_t P1, const point_t Q);
 
/* Compute the closest points on the line segments P0->P1 and Q0->Q1.  Returns
 * the distance squared between the closest points and (optionally) the closest
 * points in question (c1 is the point on P0->P1, c2 is the point on Q0->Q1).
 */
BG_EXPORT double
bg_distsq_lseg3_lseg3(point_t *c1, point_t *c2,
        const point_t P0, const point_t P1, const point_t Q0, const point_t Q1);
 
__END_DECLS
 
#endif  /* BG_LSEG_H */
/** @} */
/*
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 * mode: C
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