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-/*************************************************************************
-** EllipticalArc.hpp **
-** **
-** This file is part of dvisvgm -- a fast DVI to SVG converter **
-** Copyright (C) 2005-2021 Martin Gieseking <martin.gieseking@uos.de> **
-** **
-** This program is free software; you can redistribute it and/or **
-** modify it under the terms of the GNU General Public License as **
-** published by the Free Software Foundation; either version 3 of **
-** the License, or (at your option) any later version. **
-** **
-** This program is distributed in the hope that it will be useful, but **
-** WITHOUT ANY WARRANTY; without even the implied warranty of **
-** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
-** GNU General Public License for more details. **
-** **
-** You should have received a copy of the GNU General Public License **
-** along with this program; if not, see <http://www.gnu.org/licenses/>. **
-*************************************************************************/
-
-#pragma once
-
-#include "Bezier.hpp"
-#include "BoundingBox.hpp"
-#include "Matrix.hpp"
-#include "Pair.hpp"
-
-class EllipticalArc {
- public:
- struct CenterParams {
- DPair center; ///< absolute coordinates of the center point
- double startAngle; ///< angle of start point relative to semi-major axis (in radians)
- double deltaAngle; ///< difference between angles of the start and end point (>0 if sweep flag is set)
- };
-
- public:
- EllipticalArc (const DPair &start, double rx, double ry, double angle, bool laf, bool sweep, const DPair &end);
- EllipticalArc (const DPair &center, double rx, double ry, double rot, double startAngle, double deltaAngle);
- CenterParams getCenterParams () const;
- double rx () const {return _rx;}
- double ry () const {return _ry;}
- bool largeArc () const {return _largeArc;}
- bool sweepPositive () const {return _sweepPositive;}
- double rotationAngle () const {return _rotationAngle;}
- DPair startPoint () const {return _startPoint;}
- DPair endPoint () const {return _endPoint;}
- bool isStraightLine () const {return _rx < 1e-7 || _ry < 1e-7;}
- BoundingBox getBBox () const;
- void transform (const Matrix &matrix);
- std::vector<Bezier> approximate () const;
-
- private:
- double _rx, _ry; ///< length of semi-major and semi-minor axes
- double _rotationAngle; ///< rotation angle around center (in radians)
- bool _largeArc; ///< if true, the longer arc from start to end point is chosen, else the shorter one
- bool _sweepPositive; ///< if true, arc is drawn in direction of positive angles, else the opposite direction
- DPair _startPoint, _endPoint; ///< absolute coordinates of start and end point
-};
-