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/*
* Circle 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 <memory>
#include <2geom/numeric/fitting-tool.h>
#include <2geom/numeric/fitting-model.h>
#include <2geom/circle.h>
#include <2geom/elliptical-arc.h>
#include <toys/path-cairo.h>
#include <toys/toy-framework-2.h>
using namespace Geom;
class LFMCircleTangentEquation
: public NL::LinearFittingModelWithFixedTerms<Point, double, Circle>
{
public:
mutable unsigned count; // sigh
mutable Point pb;
vector<Point> bases;
void feed( NL::VectorView & coeff, double & fixed_term, Point const& p ) const
{
if (count >= bases.size()) {
coeff[0] = p[X];
coeff[1] = p[Y];
coeff[2] = 1;
fixed_term = p[X] * p[X] + p[Y] * p[Y];
pb = p;
} else {
Point pb = bases[count];
coeff[0] = p[X];
coeff[1] = p[Y];
coeff[2] = 0;
fixed_term = 2*p[X]*pb[X] + 2*p[Y]*pb[Y];
count ++;
}
}
size_t size() const
{
return 3;
}
void instance(Circle & c, NL::Vector const& coeff) const
{
c.setCoefficients(1, coeff[0], coeff[1], coeff[2]);
}
};
class CircleFitting : 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);
}
try
{
vector<Point> points;
points.push_back(psh.pts[1]-psh.pts[0]); // tangents
//points.push_back(psh.pts[2]-psh.pts[3]);
points.push_back(psh.pts[3]);
points.push_back(psh.pts[0]);
size_t sz = points.size();
if (sz < 3)
{
THROW_RANGEERROR("fitting error: too few points passed");
}
LFMCircleTangentEquation model;
model.count = 0;
model.bases.push_back(psh.pts[0]);
//model.bases.push_back(psh.pts[3]);
NL::least_squeares_fitter<LFMCircleTangentEquation> fitter(model, sz);
for (size_t i = 0; i < sz; ++i)
{
fitter.append(points[i]);
}
fitter.update();
NL::Vector z(sz, 0.0);
model.instance(c, fitter.result(z));
//c.set(psh.pts);
}
catch(RangeError 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( c.arc(psh.pts[0], psh.pts[1], psh.pts[3]) );
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);
cairo_move_to(cr, psh.pts[1]);
cairo_line_to(cr, 2*psh.pts[0] - psh.pts[1]);
cairo_move_to(cr, psh.pts[2]);
cairo_line_to(cr, 2*psh.pts[3] - psh.pts[2]);
cairo_stroke(cr);
cairo_set_source_rgba(cr, 0.3, 0.3, 0.3, 1.0);
cairo_set_line_width (cr, 0.3);
if (!toggles[0].on)
{
cairo_arc(cr, c.center(X), c.center(Y), c.radius(), 0, 2*M_PI);
}
else
{
draw_text(cr, psh.pts[0], "initial");
draw_text(cr, psh.pts[1], "inner");
draw_text(cr, psh.pts[2], "inner");
draw_text(cr, psh.pts[3], "final");
D2<SBasis> easb = ea.toSBasis();
cairo_d2_sb(cr, easb);
}
cairo_stroke(cr);
Toy::draw(cr, notify, width, height, save,timer_stream);
}
public:
CircleFitting()
{
first_time = true;
psh.pts.resize(4);
psh.pts[0] = Point(450, 250);
psh.pts[1] = Point(450+100, 250+100);
psh.pts[2] = Point(250+100, 400+100);
psh.pts[3] = Point(250, 400);
toggles.emplace_back(" arc / circle ", 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:
Circle c;
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 CircleFitting(), 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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