/usr/include/hkl/hkl-quaternion.h is in libhkl-dev 4.0.3-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | /* This file is part of the hkl library.
*
* The hkl library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The hkl 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the hkl library. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright (C) 2003-2010 Synchrotron SOLEIL
* L'Orme des Merisiers Saint-Aubin
* BP 48 91192 GIF-sur-YVETTE CEDEX
*
* Authors: Picca Frédéric-Emmanuel <picca@synchrotron-soleil.fr>
*/
#ifndef __HKL_QUATERNION_H__
#define __HKL_QUATERNION_H__
#include <stdio.h>
#include <math.h>
#include <hkl/hkl-macros.h>
#include <hkl/hkl-vector.h>
#include <hkl/hkl-matrix.h>
HKL_BEGIN_DECLS
struct _HklQuaternion
{
double data[4];
};
extern void hkl_quaternion_init(HklQuaternion *self,
double a, double b, double c, double d);
extern void hkl_quaternion_init_from_vector(HklQuaternion *self, const HklVector *v);
extern void hkl_quaternion_init_from_angle_and_axe(HklQuaternion *self,
double angle, const HklVector *v);
extern void hkl_quaternion_fprintf(FILE *file, const HklQuaternion *self);
extern int hkl_quaternion_cmp(const HklQuaternion *self, const HklQuaternion *q);
extern void hkl_quaternion_minus_quaternion(HklQuaternion *self,
const HklQuaternion *q);
extern void hkl_quaternion_times_quaternion(HklQuaternion *self,
const HklQuaternion *q);
extern double hkl_quaternion_norm2(const HklQuaternion *self);
extern void hkl_quaternion_conjugate(HklQuaternion *self);
extern void hkl_quaternion_to_matrix(const HklQuaternion *self, HklMatrix *m);
extern void hkl_quaternion_to_angle_and_axe(const HklQuaternion *self,
double *angle, HklVector *v);
HKL_END_DECLS
#endif
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