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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef SEEN_NR_3DUTILS_H
#define SEEN_NR_3DUTILS_H
/*
* 3D utils. Definition of gdouble vectors of dimension 3 and of some basic
* functions.
* This looks redundant, why not just use Geom::Point for this?
*
* Authors:
* Jean-Rene Reinhard <jr@komite.net>
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <2geom/forward.h>
namespace NR {
#define X_3D 0
#define Y_3D 1
#define Z_3D 2
/**
* a type of 3 gdouble components vectors
*/
struct Fvector {
Fvector() {
v[0] = v[1] = v[2] = 0.0;
}
Fvector(double x, double y, double z) {
v[0] = x;
v[1] = y;
v[2] = z;
}
double v[3];
double &operator[](unsigned i) { return v[i]; }
double operator[](unsigned i) const { return v[i]; }
};
/**
* The eye vector
*/
const static Fvector EYE_VECTOR(0, 0, 1);
/**
* returns the euclidian norm of the vector v
*
* \param v a reference to a vector with double components
* \return the euclidian norm of v
*/
double norm(const Fvector &v);
/**
* Normalizes a vector
*
* \param v a reference to a vector to normalize
*/
void normalize_vector(Fvector &v);
/**
* Computes the scalar product between two Fvectors
*
* \param a a Fvector reference
* \param b a Fvector reference
* \return the scalar product of a and b
*/
double scalar_product(const Fvector &a, const Fvector &b);
/**
* Computes the normalized sum of two Fvectors
*
* \param r a Fvector reference where we store the result
* \param a a Fvector reference
* \param b a Fvector reference
*/
void normalized_sum(Fvector &r, const Fvector &a, const Fvector &b);
/**
* Applies the transformation matrix to (x, y, z). This function assumes that
* trans[0] = trans[3]. x and y are transformed according to trans, z is
* multiplied by trans[0].
*
* \param x a reference to a x coordinate
* \param y a reference to a y coordinate
* \param z a reference to a z coordinate
* \param z a reference to a transformation matrix
*/
void convert_coord(double &x, double &y, double &z, Geom::Affine const &trans);
} /* namespace NR */
#endif /* __NR_3DUTILS_H__ */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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