Zoom.h

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/*  Copyright (C) 2008 National Institute For Space Research (INPE) - Brazil.

    This file is part of the TerraLib - a Framework for building GIS enabled applications.

    TerraLib 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.

    TerraLib 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 TerraLib. See COPYING. If not, write to
    TerraLib Team at <terralib-team@terralib.org>.
 */

/*!
  \file terralib/qt/widgets/tools/Zoom.h

  \brief This is a utility class to geographic zoom operation.
*/

#ifndef __TERRALIB_QT_WIDGETS_INTERNAL_ZOOM_H
#define __TERRALIB_QT_WIDGETS_INTERNAL_ZOOM_H

// TerraLib
#include "../Config.h"
#include "AbstractTool.h"

namespace te
{
  namespace qt
  {
    namespace widgets
    {
// Forward declarations
    class MapDisplay;

      /*!
        \class Zoom

        \brief This is a utility class to geographic zoom operation.

        \ingroup widgets
      */
      class TEQTWIDGETSEXPORT Zoom : public AbstractTool
      {
        public:

          /*!
            \enum ZoomType

            \brief Defines the zoom type.
          */
          enum ZoomType
          {
            In, /*!< Performs the zoom in operation.  */
            Out /*!< Performs the zoom out operation. */
          };

          /** @name Initializer Methods
           *  Methods related to instantiation and destruction.
           */
          //@{

          /*!
            \brief It constructs a zoom associated with the given map display.

            \param display The map display associated with the zoom operation.

            \note The class will NOT take the ownership of the given pointer.
          */
          Zoom(MapDisplay* display, const double& zoomFactor = 2.0, const ZoomType& type = In, QObject* parent = 0);

          /*! \brief Destructor. */
          virtual ~Zoom();

          //@}

          /*!
            \brief Sets the zoom operation type.

            \param type The zoom operation type - ZoomIn | ZoomOut;
          */
          void setZoomType(const ZoomType& type);

          /*!
            \brief Performs the zoom operation on map display, considering the zoom factor, zoom type and the given point.

            \param point A point in world coordinates.

            \note If the given point is not null, the new extent will be centered on this point. Otherwise, the current center will be kepped.
          */
          void applyZoom(const QPointF& point = QPointF());

        protected:

          double m_zoomFactor;   //!< Factor used to zoom. i.e. A factor value of 2.0 (default) will generate a new extent twice (%) bigger or smaller, depending of ZoomType.
          ZoomType m_zoomType;   //!< Enum that indicates the zoom type.
      };

    } // end namespace widgets
  }   // end namespace qt
}     // end namespace te

#endif  // __TERRALIB_QT_WIDGETS_INTERNAL_ZOOM_H