1 /**************************************************************************
2 * vector.hxx -- additional vector routines
4 * Written by Curtis Olson, started December 1997.
6 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * (Log is kept at end of this file)
24 **************************************************************************/
32 # error This library requires C++
39 /* Map a vector onto the plane specified by normal */
40 #if defined( USE_XTRA_MAT3_INLINES )
41 # define map_vec_onto_cur_surface_plane(normal, v0, vec, result) { \
42 double scale = ((normal[0]*vec[0]+normal[1]*vec[1]+normal[2]*vec[2]) / \
43 (normal[0]*normal[0]+normal[1]*normal[1]+normal[2]*normal[2])); \
44 result[0] = vec[0]-normal[0]*scale; \
45 result[1] = vec[1]-normal[1]*scale; \
46 result[2] = vec[2]-normal[2]*scale; \
49 void map_vec_onto_cur_surface_plane(MAT3vec normal, MAT3vec v0, MAT3vec vec,
51 #endif //defined( USE_XTRA_MAT3_INLINES )
54 // Given a point p, and a line through p0 with direction vector d,
55 // find the shortest distance from the point to the line
56 double fgPointLine(MAT3vec p, MAT3vec p0, MAT3vec d);
59 // Given a point p, and a line through p0 with direction vector d,
60 // find the shortest distance (squared) from the point to the line
61 double fgPointLineSquared(MAT3vec p, MAT3vec p0, MAT3vec d);
64 #endif /* _VECTOR_HXX */
68 /* Revision 1.3 1998/08/24 20:04:13 curt
69 /* Various "inline" code optimizations contributed by Norman Vine.
71 * Revision 1.2 1998/07/24 21:34:38 curt
72 * fgPointLine() rewritten into fgPointLineSquared() ... this ultimately saves
73 * us from doing a sqrt().
75 * Revision 1.1 1998/07/08 14:40:10 curt
76 * polar3d.[ch] renamed to polar3d.[ch]xx, vector.[ch] renamed to vector.[ch]xx
77 * Updated fg_geodesy comments to reflect that routines expect and produce
80 * Revision 1.4 1998/04/21 17:03:51 curt
81 * Prepairing for C++ integration.
83 * Revision 1.3 1998/01/22 02:59:39 curt
84 * Changed #ifdef FILE_H to #ifdef _FILE_H
86 * Revision 1.2 1998/01/19 19:27:14 curt
87 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
88 * This should simplify things tremendously.
90 * Revision 1.1 1997/12/22 04:13:18 curt