CairoFontMetrics.hpp

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/* 
 * CairoFontMetrics.hpp 
 *
 * This file is part of the Chemical Data Processing Toolkit
 *
 * Copyright (C) 2003 Thomas Seidel <thomas.seidel@univie.ac.at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#ifndef CDPL_VIS_CAIROFONTMETRICS_HPP
#define CDPL_VIS_CAIROFONTMETRICS_HPP
 
#include <memory>
 
#include "CDPL/Vis/APIPrefix.hpp"
#include "CDPL/Vis/FontMetrics.hpp"
#include "CDPL/Vis/CairoPointer.hpp"
 
 
typedef struct _cairo _cairo_t;
 
 
namespace CDPL
{
 
    namespace Vis
    {
 
        class CDPL_VIS_API CairoFontMetrics : public FontMetrics
        {
 
          public:
            CairoFontMetrics(const CairoPointer<cairo_t>& cairo_ctxt);
 
            ~CairoFontMetrics();
 
            void setFont(const Font& font);
 
            double getAscent() const;
            double getDescent() const;
            double getHeight() const;
            double getLeading() const;
 
            double getWidth(const std::string& str) const;
            double getWidth(char ch) const;
 
            void getBounds(const std::string& str, Rectangle2D& bounds) const;
            void getBounds(char ch, Rectangle2D& bounds) const;
 
          private:
            struct CairoExtents;
 
            CairoFontMetrics(const CairoFontMetrics&);
 
            CairoFontMetrics& operator=(const CairoFontMetrics&);
 
            CairoPointer<cairo_t>       cairoContext;
            std::unique_ptr<CairoExtents> cairoExtents;
        };
    } // namespace Vis
} // namespace CDPL
 
#endif // CDPL_VIS_CAIROFONTMETRICS_HPP