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/*
* Ellipse and Elliptical Arc Fitting Example
*
* Authors:
* Marco Cecchetti <mrcekets at gmail.com>
*
* Copyright 2008 authors
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*/
#include <2geom/numeric/fitting-tool.h>
#include <2geom/numeric/fitting-model.h>
#include <2geom/ellipse.h>
#include <2geom/elliptical-arc.h>
#include <toys/path-cairo.h>
#include <toys/toy-framework-2.h>
using namespace Geom;
class EllipseFitting : public Toy
{
private:
void draw( cairo_t *cr, std::ostringstream *notify,
int width, int height, bool save, std::ostringstream *timer_stream) override
{
if (first_time)
{
first_time = false;
Point toggle_sp( 300, height - 50);
toggles[0].bounds = Rect( toggle_sp, toggle_sp + Point(120,25) );
sliders[0].geometry(Point(50, height - 50), 100);
}
size_t n = (size_t)(sliders[0].value()) + 5;
if (n < psh.pts.size())
{
psh.pts.resize(n);
}
else if (n > psh.pts.size())
{
psh.push_back(400*uniform()+50, 300*uniform()+50);
}
try
{
e.fit(psh.pts);
}
catch(LogicalError exc)
{
std::cerr << exc.what() << std::endl;
Toy::draw(cr, notify, width, height, save,timer_stream);
return;
}
if (toggles[0].on)
{
try
{
std::unique_ptr<EllipticalArc> eap( e.arc(psh.pts[0], psh.pts[2], psh.pts[4]) );
ea = *eap;
}
catch(RangeError exc)
{
std::cerr << exc.what() << std::endl;
Toy::draw(cr, notify, width, height, save,timer_stream);
return;
}
}
cairo_set_source_rgba(cr, 0.3, 0.3, 0.3, 1.0);
cairo_set_line_width (cr, 0.3);
if (!toggles[0].on)
{
draw_elliptical_arc_with_cairo( cr,
e.center(X), e.center(Y),
e.ray(X), e.ray(Y),
0, 2*M_PI,
e.rotationAngle() );
}
else
{
draw_text(cr, psh.pts[0], "initial");
draw_text(cr, psh.pts[2], "inner");
draw_text(cr, psh.pts[4], "final");
D2<SBasis> easb = ea.toSBasis();
cairo_d2_sb(cr, easb);
}
cairo_stroke(cr);
Toy::draw(cr, notify, width, height, save,timer_stream);
}
void draw_elliptical_arc_with_cairo(
cairo_t *cr,
double _cx, double _cy,
double _rx, double _ry,
double _sa, double _ea,
double _ra = 0
) const
{
double cos_rot_angle = std::cos(_ra);
double sin_rot_angle = std::sin(_ra);
cairo_matrix_t transform_matrix;
cairo_matrix_init( &transform_matrix,
_rx * cos_rot_angle, _rx * sin_rot_angle,
-_ry * sin_rot_angle, _ry * cos_rot_angle,
_cx, _cy
);
cairo_save(cr);
cairo_transform(cr, &transform_matrix);
cairo_arc(cr, 0, 0, 1, _sa, _ea);
cairo_restore(cr);
}
public:
EllipseFitting()
{
first_time = true;
psh.pts.resize(5);
psh.pts[0] = Point(450, 250);
psh.pts[1] = Point(250, 100);
psh.pts[2] = Point(250, 400);
psh.pts[3] = Point(400, 320);
psh.pts[4] = Point(50, 250);
toggles.emplace_back(" arc / ellipse ", false);
sliders.emplace_back(0, 5, 1, 0, "more handles");
handles.push_back(&psh);
handles.push_back(&(toggles[0]));
handles.push_back(&(sliders[0]));
}
private:
Ellipse e;
EllipticalArc ea;
bool first_time;
PointSetHandle psh;
std::vector<Toggle> toggles;
std::vector<Slider> sliders;
};
int main(int argc, char **argv)
{
init( argc, argv, new EllipseFitting(), 600, 600 );
return 0;
}
/*
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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