tdegraphics/ksvg/impl/svgpathparser.h

/* This file is part of the KDE project
   Copyright (C) 2002, 2003 The Karbon Developers

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#ifndef __SVGPATHPARSER_H__
#define __SVGPATHPARSER_H__

class TQString;

namespace KSVG
{
	const char *getNumber( const char *, double & );
}

/**
 * Parser for svg path data, contained in the d attribute.
 *
 * The parser delivers encountered commands and parameters by calling
 * methods that correspond to those commands. Clients have to derive
 * from this class and implement the abstract command methods.
 *
 * There are two operating modes. By default the parser just delivers unaltered
 * svg path data commands and parameters. In the second mode, it will convert all
 * relative coordinates to absolute ones, and convert all curves to cubic beziers.
 */
class SVGPathParser
{
public:
	void parseSVG( const TQString &d, bool process = false );

	static const char *getCoord( const char *, double & );

protected:
	virtual void svgMoveTo( double x1, double y1, bool closed, bool abs = true ) = 0;
	virtual void svgLineTo( double x1, double y1, bool abs = true ) = 0;
	virtual void svgLineToHorizontal( double x, bool abs = true );
	virtual void svgLineToVertical( double y, bool abs = true );
	virtual void svgCurveToCubic( double x1, double y1, double x2, double y2, double x, double y, bool abs = true ) = 0;
	virtual void svgCurveToCubicSmooth( double x, double y, double x2, double y2, bool abs = true );
	virtual void svgCurveToQuadratic( double x, double y, double x1, double y1, bool abs = true );
	virtual void svgCurveToQuadraticSmooth( double x, double y, bool abs = true );
	virtual void svgArcTo( double x, double y, double r1, double r2, double angle, bool largeArcFlag, bool sweepFlag, bool abs = true );
	virtual void svgClosePath() = 0;
private:
	void calculateArc( bool relative, double &curx, double &cury, double angle, double x, double y, double r1, double r2, bool largeArcFlag, bool sweepFlag );
};

#endif