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/*
* Copyright (C) 2015-2018 S[&]T, The Netherlands.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "harp-geometry.h"
#include <math.h>
#include <stdlib.h>
/* Check if two 3D vectors are equal */
int harp_vector3d_equal(const harp_vector3d *vectora, const harp_vector3d *vectorb)
{
return (HARP_GEOMETRY_FPeq(vectora->x, vectorb->x) &&
HARP_GEOMETRY_FPeq(vectora->y, vectorb->y) && HARP_GEOMETRY_FPeq(vectora->z, vectorb->z));
}
/* Calculate the dotproduct of two 3D vectors
*
* Given two 3D vectors, a and b, their dot product
* (i.e. a scalar value) is given by:
*
* dotproduct = (a . b) = a.x * b.x + a.y * b.y + a.z * b.z
*/
double harp_vector3d_dotproduct(const harp_vector3d *vectora, const harp_vector3d *vectorb)
{
return ((vectora->x * vectorb->x) + (vectora->y * vectorb->y) + (vectora->z * vectorb->z));
}
/* Calculate the cross product of two 3d vectors
*
* Given two 3D vectors, a and b, their cross product
* (i.e. a new 3D vector c) is given by:
*
* c = (a x b) = (a.y * b.z - a.z * b.y,
* a.z * b.x - a.x * b.z,
* a.x * b.y - a.y * b.x)
*/
void harp_vector3d_crossproduct(harp_vector3d *vectorc, const harp_vector3d *vectora, const harp_vector3d *vectorb)
{
vectorc->x = vectora->y * vectorb->z - vectora->z * vectorb->y;
vectorc->y = vectora->z * vectorb->x - vectora->x * vectorb->z;
vectorc->z = vectora->x * vectorb->y - vectora->y * vectorb->x;
}
/* Calculate the norm of a 3D vector */
double harp_vector3d_norm(const harp_vector3d *vector)
{
double norm_squared = harp_vector3d_dotproduct(vector, vector);
return sqrt(norm_squared);
}
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