plugin.h

一个非常好的GIS开源新版本

/***************************************************************************
                          plugin.h
 Functions:
                             -------------------
    begin                : Jan 21, 2004
    copyright            : (C) 2004 by Tim Sutton
    email                : [e-mail]

 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 /*  $Id: plugin.h 7797 2007-12-16 22:14:48Z homann $ */
#ifndef QGSNORTHARROWPLUGIN
#define QGSNORTHARROWPLUGIN

#include "../qgisplugin.h"

#include <QObject>
#include <QStringList>
class QgisInterface;
class QAction;
class QToolBar;
class QPainter;
/**
* \class Plugin
* \brief North Arrow plugin for QGIS
*
*/
class QgsNorthArrowPlugin:public QObject, public QgisPlugin
{
  Q_OBJECT public:
      /**
       * Constructor for a plugin. The QgisInterface pointer is passed by
       * QGIS when it attempts to instantiate the plugin.
       * @param qI Pointer to the QgisInterface object.
       */
    QgsNorthArrowPlugin( QgisInterface * );
  //! Destructor
  virtual ~QgsNorthArrowPlugin();
  public slots:
  //! init the gui
  virtual void initGui();
  //!set values on the gui when a project is read or the gui first loaded
  void projectRead();
  //! Show the dialog box
  void run();
  // draw some arbitary text to the screen
  void renderNorthArrow(QPainter *);
  //! Run when the user has set a new rotation
  void rotationChanged(int);
  //! Refresh the map display using the mapcanvas exported via the plugin interface
  void refreshCanvas();
  //! unload the plugin
  void unload();
  //! show the help document
  void help();
  //! set north arrow placement
  void setPlacement(int);
  //! enable or disable north arrow
  void setEnabled(bool);
  //! enable or disable the automatic setting of the arrow direction
  void setAutomatic(bool);
  //! try to calculate the direction for the north arrow. Sets the
  // private class rotation variable. If unable to calculate the
  // direction, the function returns false and leaves the rotation
  // variable as is.
  bool calculateNorthDirection();

    private:

  static const double PI;
  //  static const double DEG2RAD;
  static const double TOL;

  // The amount of rotation for the north arrow
  int mRotationInt;
  int pluginType;
  // enable or disable north arrow
  bool mEnable;
  //! enable or disable the automatic setting of the arrow direction
  bool mAutomatic;
  // The placement index and translated text
  int mPlacementIndex;
  QStringList mPlacementLabels;
  //! Pointer to the QGIS interface object
  QgisInterface *qGisInterface;
  //! Pointer to the QAction object used in the menu and toolbar
  QAction *myQActionPointer;
};

#endif