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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* 3x4 transformation matrix to map points from projective 3-space into the projective plane
*
* Authors:
* Maximilian Albert <Anhalter42@gmx.de>
*
* Copyright (C) 2007 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <glib.h>
#include "proj_pt.h"
#include "svg/stringstream.h"
namespace Proj {
Pt2::Pt2(const char *coord_str) {
if (!coord_str) {
pt[0] = 0.0;
pt[1] = 0.0;
pt[2] = 1.0;
g_warning ("Coordinate string is empty. Creating default Pt2\n");
return;
}
char **coords = g_strsplit(coord_str, ":", 0);
if (coords[0] == nullptr || coords[1] == nullptr || coords[2] == nullptr) {
g_strfreev (coords);
g_warning ("Malformed coordinate string.\n");
return;
}
pt[0] = g_ascii_strtod(coords[0], nullptr);
pt[1] = g_ascii_strtod(coords[1], nullptr);
pt[2] = g_ascii_strtod(coords[2], nullptr);
g_strfreev (coords);
}
void
Pt2::normalize() {
if (fabs(pt[2]) < 1E-6 || pt[2] == 1.0)
return;
pt[0] /= pt[2];
pt[1] /= pt[2];
pt[2] = 1.0;
}
Geom::Point
Pt2::affine() {
if (fabs(pt[2]) < epsilon) {
return Geom::Point (Geom::infinity(), Geom::infinity());
}
return Geom::Point (pt[0]/pt[2], pt[1]/pt[2]);
}
char *
Pt2::coord_string() {
Inkscape::SVGOStringStream os;
os << pt[0] << " : "
<< pt[1] << " : "
<< pt[2];
return g_strdup(os.str().c_str());
}
Pt3::Pt3(const char *coord_str) {
if (!coord_str) {
pt[0] = 0.0;
pt[1] = 0.0;
pt[2] = 0.0;
pt[3] = 1.0;
g_warning ("Coordinate string is empty. Creating default Pt2\n");
return;
}
char **coords = g_strsplit(coord_str, ":", 0);
if (coords[0] == nullptr || coords[1] == nullptr ||
coords[2] == nullptr || coords[3] == nullptr) {
g_strfreev (coords);
g_warning ("Malformed coordinate string.\n");
return;
}
pt[0] = g_ascii_strtod(coords[0], nullptr);
pt[1] = g_ascii_strtod(coords[1], nullptr);
pt[2] = g_ascii_strtod(coords[2], nullptr);
pt[3] = g_ascii_strtod(coords[3], nullptr);
}
void
Pt3::normalize() {
if (fabs(pt[3]) < 1E-6 || pt[3] == 1.0)
return;
pt[0] /= pt[3];
pt[1] /= pt[3];
pt[2] /= pt[3];
pt[3] = 1.0;
}
char *
Pt3::coord_string() {
Inkscape::SVGOStringStream os;
os << pt[0] << " : "
<< pt[1] << " : "
<< pt[2] << " : "
<< pt[3];
return g_strdup(os.str().c_str());
}
} // namespace Proj
/*
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 :
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