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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef INKSCAPE_LPE_PTS_TO_ELLIPSE_H
#define INKSCAPE_LPE_PTS_TO_ELLIPSE_H
/** \file
* LPE "Points to Ellipse" implementation
*/
/*
* Authors:
* Markus Schwienbacher
*
* Copyright (C) Markus Schwienbacher 2013 <mschwienbacher@gmail.com>
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "live_effects/effect.h"
#include "live_effects/parameter/bool.h"
#include "live_effects/parameter/enum.h"
#include <gsl/gsl_linalg.h>
// struct gsl_vector;
// struct gsl_permutation;
namespace Inkscape {
namespace LivePathEffect {
enum EllipseMethod {
EM_AUTO,
EM_CIRCLE,
EM_ISOMETRIC_CIRCLE,
EM_PERSPECTIVE_CIRCLE,
EM_STEINER_ELLIPSE,
EM_STEINER_INELLIPSE,
EM_END
};
class LPEPts2Ellipse : public Effect {
public:
LPEPts2Ellipse(LivePathEffectObject *lpeobject);
~LPEPts2Ellipse() override;
Geom::PathVector doEffect_path(Geom::PathVector const &path_in) override;
private:
LPEPts2Ellipse(const LPEPts2Ellipse &) = delete;
LPEPts2Ellipse &operator=(const LPEPts2Ellipse &) = delete;
int genIsometricEllipse(std::vector<Geom::Point> const &points_in, Geom::PathVector &path_out);
int genFitEllipse(std::vector<Geom::Point> const &points_in, Geom::PathVector &path_out);
int genSteinerEllipse(std::vector<Geom::Point> const &points_in, bool gen_inellipse, Geom::PathVector &path_out);
int genPerspectiveEllipse(std::vector<Geom::Point> const &points_in, Geom::PathVector &path_out);
// utility functions
static int unit_arc_path(Geom::Path &path_in, Geom::Affine &affine, double start = 0.0,
double end = 2.0 * M_PI, // angles
bool slice = false);
static void gen_iso_frame_paths(Geom::PathVector &path_out, const Geom::Affine &affine);
static void gen_perspective_frame_paths(Geom::PathVector &path_out, const double rot_angle,
double projmatrix[3][3]);
static void gen_axes_paths(Geom::PathVector &path_out, const Geom::Affine &affine);
static void gen_perspective_axes_paths(Geom::PathVector &path_out, const double rot_angle, double projmatrix[3][3]);
static bool is_ccw(const std::vector<Geom::Point> &pts);
static Geom::Point projectPoint(Geom::Point p, double m[][3]);
// GUI parameters
EnumParam<EllipseMethod> method;
BoolParam gen_isometric_frame;
BoolParam gen_perspective_frame;
BoolParam gen_arc;
BoolParam other_arc;
BoolParam slice_arc;
BoolParam draw_axes;
BoolParam draw_perspective_axes;
ScalarParam rot_axes;
BoolParam draw_ori_path;
// collect the points from the input paths
std::vector<Geom::Point> points;
// used for solving perspective circle
gsl_vector *gsl_x;
gsl_permutation *gsl_p;
std::vector<Geom::Point> five_pts;
};
} // namespace LivePathEffect
} // namespace Inkscape
#endif
/*
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 :
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