63 lines
2 KiB
C++
63 lines
2 KiB
C++
// vector.hxx -- additional vector routines
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//
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// Written by Curtis Olson, started December 1997.
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//
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// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#ifndef _VECTOR_HXX
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#define _VECTOR_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include "mat3.h"
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// Map a vector onto the plane specified by normal
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#if defined( USE_XTRA_MAT3_INLINES )
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# define map_vec_onto_cur_surface_plane(normal, v0, vec, result) { \
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double scale = ((normal[0]*vec[0]+normal[1]*vec[1]+normal[2]*vec[2]) / \
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(normal[0]*normal[0]+normal[1]*normal[1]+normal[2]*normal[2])); \
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result[0] = vec[0]-normal[0]*scale; \
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result[1] = vec[1]-normal[1]*scale; \
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result[2] = vec[2]-normal[2]*scale; \
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}
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#else
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void map_vec_onto_cur_surface_plane(MAT3vec normal, MAT3vec v0, MAT3vec vec,
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MAT3vec result);
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#endif //defined( USE_XTRA_MAT3_INLINES )
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// Given a point p, and a line through p0 with direction vector d,
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// find the shortest distance from the point to the line
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double fgPointLine(MAT3vec p, MAT3vec p0, MAT3vec d);
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// Given a point p, and a line through p0 with direction vector d,
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// find the shortest distance (squared) from the point to the line
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double fgPointLineSquared(MAT3vec p, MAT3vec p0, MAT3vec d);
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#endif // _VECTOR_HXX
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