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/*
* Copyright (C) 2015-2017 Karlsruhe Institute of Technology
*
* This file is part of Ufo.
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* 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 library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <math.h>
#include <glib.h>
#include "ufo-math.h"
UfoPoint *
ufo_point_new (gdouble x, gdouble y, gdouble z)
{
UfoPoint *point = g_new (UfoPoint, 1);
point->x = x;
point->y = y;
point->z = z;
return point;
}
void
ufo_point_free (UfoPoint *point)
{
g_free (point);
}
void
ufo_point_mul_scalar (UfoPoint *point, gdouble value)
{
point->x *= value;
point->y *= value;
point->z *= value;
}
void
ufo_point_add (UfoPoint *point, UfoPoint *other)
{
point->x += other->x;
point->y += other->y;
point->z += other->z;
}
void
ufo_point_subtract (UfoPoint *point, UfoPoint *other)
{
point->x -= other->x;
point->y -= other->y;
point->z -= other->z;
}
gdouble
ufo_point_dot_product (UfoPoint *point, UfoPoint *other)
{
return point->x * other->x + point->y * other->y + point->z * other->z;
}
void
ufo_point_rotate_x (UfoPoint *point, gdouble angle)
{
UfoPoint tmp;
gdouble sin_angle = sin (angle);
gdouble cos_angle = cos (angle);
tmp.x = point->x;
tmp.y = point->y * cos_angle - point->z * sin_angle;
tmp.z = point->y * sin_angle + point->z * cos_angle;
*point = tmp;
}
void
ufo_point_rotate_y (UfoPoint *point, gdouble angle)
{
UfoPoint tmp;
gdouble sin_angle = sin (angle);
gdouble cos_angle = cos (angle);
tmp.x = point->x * cos_angle + point->z * sin_angle;
tmp.y = point->y;
tmp.z = -point->x * sin_angle + point->z * cos_angle;
*point = tmp;
}
void
ufo_point_rotate_z (UfoPoint *point, gdouble angle)
{
UfoPoint tmp;
gdouble sin_angle = sin (angle);
gdouble cos_angle = cos (angle);
tmp.x = point->x * cos_angle - point->y * sin_angle;
tmp.y = point->x * sin_angle + point->y * cos_angle;
tmp.z = point->z;
*point = tmp;
}
gdouble
ufo_clip_value (gdouble value, gdouble minimum, gdouble maximum)
{
return MAX (minimum, MIN (maximum, value));
}
static gdouble
find_extremum (gdouble *array, gint num_values, gint sgn)
{
gint i;
gdouble minimum = sgn * array[0];
for (i = 1; i < num_values; i++) {
if (sgn * array[i] < minimum) {
minimum = sgn * array[i];
}
}
return sgn * minimum;
}
gdouble
ufo_array_maximum (gdouble *array, gint num_values)
{
return find_extremum (array, num_values, -1);
}
gdouble
ufo_array_minimum (gdouble *array, gint num_values)
{
return find_extremum (array, num_values, 1);
}
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