nr-3dutils.h

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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
 
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]; }
};
 
const static Fvector EYE_VECTOR(0, 0, 1);
 
double norm(const Fvector &v);
 
void normalize_vector(Fvector &v);
 
double scalar_product(const Fvector &a, const Fvector &b);
 
void normalized_sum(Fvector &r, const Fvector &a, const Fvector &b);
 
void convert_coord(double &x, double &y, double &z, Geom::Affine const &trans);
 
} /* namespace NR */
 
#endif /* SEEN_INKSCAPE_NR_3DUTILS_H */
/*
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  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
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  End:
*/
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