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+/*************************************************************************
+** EllipticalArc.hpp **
+** **
+** This file is part of dvisvgm -- a fast DVI to SVG converter **
+** Copyright (C) 2005-2019 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
+};
+