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Diffstat (limited to 'dviware/dvisvgm/src/EllipticalArc.hpp')
-rw-r--r-- | dviware/dvisvgm/src/EllipticalArc.hpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/EllipticalArc.hpp b/dviware/dvisvgm/src/EllipticalArc.hpp new file mode 100644 index 0000000000..5d20558196 --- /dev/null +++ b/dviware/dvisvgm/src/EllipticalArc.hpp @@ -0,0 +1,59 @@ +/************************************************************************* +** 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 ¢er, 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 +}; + |