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/*************************************************************************
** SVGCharHandler.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2018 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/>. **
*************************************************************************/
#ifndef SVGCHARHANDLER_HPP
#define SVGCHARHANDLER_HPP
#include <memory>
#include <stack>
#include "Color.hpp"
#include "Font.hpp"
#include "Matrix.hpp"
template <typename T>
class CharProperty {
public:
CharProperty (const T &v) : _value(v), _changed(false) {}
void set (const T &v) {
if (v != _value) {
_value = v;
_changed = true;
}
}
const T& get () const {return _value;}
operator const T& () const {return _value;}
bool changed () const {return _changed;}
void changed (bool c) {_changed = c;}
private:
T _value;
bool _changed;
};
class XMLElementNode;
/** Base class for all character handlers. These handlers create SVG representations
* for the added characters and append them to the SVG tree. */
class SVGCharHandler {
public:
SVGCharHandler () : _color(Color::BLACK), _font(0), _fontnum(0), _matrix(1), _vertical(false), _initialContextNode(0) {}
virtual ~SVGCharHandler() =default;
virtual void setInitialContextNode (XMLElementNode *node);
virtual void appendChar (uint32_t c, double x, double y) =0;
virtual void notifyXAdjusted () {}
virtual void notifyYAdjusted () {}
void setColor (const Color &color) {_color.set(color);}
void setFont (const Font &font, int id) {_font.set(&font); _fontnum = id;}
void setMatrix (const Matrix &matrix) {_matrix.set(matrix);}
void setVertical (bool vertical) {_vertical.set(vertical);}
Color getColor () const {return _color.get();}
const Font* getFont () const {return _font.get();}
const Matrix& getMatrix () const {return _matrix.get();}
protected:
virtual void resetContextNode ();
XMLElementNode* pushContextNode (std::unique_ptr<XMLElementNode> &&node);
void popContextNode ();
XMLElementNode* contextNode () const {
return _contextNodeStack.empty() ? _initialContextNode : _contextNodeStack.top();
}
CharProperty<Color> _color; ///< current color
CharProperty<const Font*> _font; ///< current font
int _fontnum; ///< current font ID
CharProperty<Matrix> _matrix; ///< current transformation
CharProperty<bool> _vertical; ///< current writing mode
private:
XMLElementNode *_initialContextNode; ///< SVG element the generated character nodes are attached to
std::stack<XMLElementNode*> _contextNodeStack;
};
/** Base class for all character handlers that create SVG <text> elements. */
class SVGCharTextHandler : public SVGCharHandler {
public:
SVGCharTextHandler (bool selectFontByClass) : _selectFontByClass(selectFontByClass) {}
protected:
std::unique_ptr<XMLElementNode> createTextNode (double x, double y) const;
private:
bool _selectFontByClass;
};
#endif
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