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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
commit | cca66b9ec4e494c1d919bff0f71a820d8afab1fa (patch) | |
tree | 146f39ded1c938019e1ed42d30923c2ac9e86789 /src/display/nr-3dutils.h | |
parent | Initial commit. (diff) | |
download | inkscape-cca66b9ec4e494c1d919bff0f71a820d8afab1fa.tar.xz inkscape-cca66b9ec4e494c1d919bff0f71a820d8afab1fa.zip |
Adding upstream version 1.2.2.upstream/1.2.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/display/nr-3dutils.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/display/nr-3dutils.h b/src/display/nr-3dutils.h new file mode 100644 index 0000000..52b595c --- /dev/null +++ b/src/display/nr-3dutils.h @@ -0,0 +1,105 @@ +// 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 euclidean norm of the vector v + * + * \param v a reference to a vector with double components + * \return the euclidean 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 : |