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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 3D utils.
*
* Authors:
* Jean-Rene Reinhard <jr@komite.net>
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <glib.h>
#include "display/nr-3dutils.h"
#include <cmath>
#include <2geom/point.h>
#include <2geom/affine.h>
namespace NR {
void convert_coord(gdouble &x, gdouble &y, gdouble &z, Geom::Affine const &trans) {
Geom::Point p = Geom::Point(x, y);
p *= trans;
x = p[Geom::X];
y = p[Geom::Y];
z *= trans[0];
}
gdouble norm(const Fvector &v) {
return sqrt(v[X_3D]*v[X_3D] + v[Y_3D]*v[Y_3D] + v[Z_3D]*v[Z_3D]);
}
void normalize_vector(Fvector &v) {
gdouble nv = norm(v);
//TODO test nv == 0
for (int j = 0; j < 3; j++) {
v[j] /= nv;
}
}
gdouble scalar_product(const Fvector &a, const Fvector &b) {
return a[X_3D] * b[X_3D] +
a[Y_3D] * b[Y_3D] +
a[Z_3D] * b[Z_3D];
}
void normalized_sum(Fvector &r, const Fvector &a, const Fvector &b) {
r[X_3D] = a[X_3D] + b[X_3D];
r[Y_3D] = a[Y_3D] + b[Y_3D];
r[Z_3D] = a[Z_3D] + b[Z_3D];
normalize_vector(r);
}
}/* namespace NR */
/*
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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