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* This file is part of QMapControl,
* an open-source cross-platform map widget
* Copyright (C) 2007 - 2008 Kai Winter
* This program 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 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
* GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License
* along with QMapControl. If not, see <>.
* Contact e-mail:
* Program URL   :


#include "mapadapter.h"

namespace qmapcontrol
    //! MapAdapter which do not load map tiles.
     * The EmptyMapAdapter can be used if QMapControl should not load any map tiles. This is useful if you
     * only want to display an image through a FixedImageOverlay e.g.
     *  @author Kai Winter <>

    class EmptyMapAdapter : public MapAdapter
        //! Constructor.
         * @param tileSize This parameter seems unnecessary for this type of MapAdaper on first sight. But since
         * this parameter defines the size of the offscreen image it could be used for a little performance
         * tuning (larger offscreen-images have to be redrawed less times).
         * @param minZoom the minimum zoom level
         * @param maxZoom the maximum zoom level

        EmptyMapAdapter(int tileSize = 256, int minZoom = 0, int maxZoom = 17);

        virtual ~EmptyMapAdapter();

        virtual QPoint coordinateToDisplay(const QPointF&) const;
        virtual QPointF displayToCoordinate(const QPoint&) const;

        qreal PI;

        qreal rad_deg(qreal) const;
        qreal deg_rad(qreal) const;

        virtual bool isValid(int x, int y, int z) const;
        virtual void zoom_in();
        virtual void zoom_out();
        virtual QString query(int x, int y, int z) const;
        virtual int tilesonzoomlevel(int zoomlevel) const;
        virtual int xoffset(int x) const;
        virtual int yoffset(int y) const;