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/**
* \file
* \brief Ellipse 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.
*/
#ifndef _2GEOM_ELLIPSE_H_
#define _2GEOM_ELLIPSE_H_
#include <2geom/point.h>
#include <2geom/exception.h>
#include <2geom/matrix.h>
namespace Geom
{
class SVGEllipticalArc;
class Circle;
class Ellipse
{
public:
Ellipse()
{}
Ellipse(double cx, double cy, double rx, double ry, double a)
: m_centre(cx, cy), m_ray(rx, ry), m_angle(a)
{
}
// build an ellipse by its implicit equation:
// Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0
Ellipse(double A, double B, double C, double D, double E, double F)
{
set(A, B, C, D, E, F);
}
Ellipse(std::vector<Point> const& points)
{
set(points);
}
Ellipse(Geom::Circle const &c);
void set(double cx, double cy, double rx, double ry, double a)
{
m_centre[X] = cx;
m_centre[Y] = cy;
m_ray[X] = rx;
m_ray[Y] = ry;
m_angle = a;
}
// build an ellipse by its implicit equation:
// Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0
void set(double A, double B, double C, double D, double E, double F);
// biuld up the best fitting ellipse wrt the passed points
// prerequisite: at least 5 points must be passed
void set(std::vector<Point> const& points);
SVGEllipticalArc
arc(Point const& initial, Point const& inner, Point const& final,
bool _svg_compliant = true);
Point center() const
{
return m_centre;
}
Coord center(Dim2 d) const
{
return m_centre[d];
}
Coord ray(Dim2 d) const
{
return m_ray[d];
}
Coord rot_angle() const
{
return m_angle;
}
std::vector<double> implicit_form_coefficients() const;
Ellipse transformed(Matrix const& m) const;
private:
Point m_centre, m_ray;
double m_angle;
};
} // end namespace Geom
#endif // _2GEOM_ELLIPSE_H_
/*
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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