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/*
* Circle Curve
*
* 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/circle.h>
#include <2geom/ellipse.h>
#include <2geom/svg-elliptical-arc.h>
#include <2geom/numeric/fitting-tool.h>
#include <2geom/numeric/fitting-model.h>
namespace Geom
{
void Circle::set(double A, double B, double C, double D)
{
if (A == 0)
{
THROW_RANGEERROR("square term coefficient == 0");
}
//std::cerr << "B = " << B << " C = " << C << " D = " << D << std::endl;
double b = B / A;
double c = C / A;
double d = D / A;
m_centre[X] = -b/2;
m_centre[Y] = -c/2;
double r2 = m_centre[X] * m_centre[X] + m_centre[Y] * m_centre[Y] - d;
if (r2 < 0)
{
THROW_RANGEERROR("ray^2 < 0");
}
m_ray = std::sqrt(r2);
}
void Circle::set(std::vector<Point> const& points)
{
size_t sz = points.size();
if (sz < 3)
{
THROW_RANGEERROR("fitting error: too few points passed");
}
NL::LFMCircle model;
NL::least_squeares_fitter<NL::LFMCircle> 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(*this, fitter.result(z));
}
SVGEllipticalArc
Circle::arc(Point const& initial, Point const& inner, Point const& final,
bool _svg_compliant)
{
Ellipse e(center(X), center(Y), ray(), ray(), 0);
return e.arc(initial, inner, final, _svg_compliant);
}
} // end namespace Geom
/*
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:encoding=utf-8:textwidth=99 :
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