dox/GUISupport/Qt/Chart/vtkQtChartZoomHistory.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkQtChartZoomHistory.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/


#ifndef _vtkQtChartZoomHistory_h
#define _vtkQtChartZoomHistory_h


#include "vtkQtChartExport.h"

class vtkQtChartZoomHistoryInternal;


class VTKQTCHART_EXPORT vtkQtChartZoomViewport
{
public:
  vtkQtChartZoomViewport();
  ~vtkQtChartZoomViewport() {}

  void setPosition(float x, float y);

  void setZoom(float x, float y);

  float getXPosition() const {return this->X;}

  float getYPosition() const {return this->Y;}

  float getXZoom() const {return this->XFactor;}

  float getYZoom() const {return this->YFactor;}

private:
  float X;        
  float Y;        
  float XFactor;  
  float YFactor;  
};


class VTKQTCHART_EXPORT vtkQtChartZoomHistory
{
public:
  vtkQtChartZoomHistory();
  ~vtkQtChartZoomHistory();

  void setLimit(int limit);

  int getLimit() const {return this->Allowed;}

  void addHistory(float x, float y, float xZoom, float yZoom);

  void updatePosition(float x, float y);

  bool isPreviousAvailable() const;

  bool isNextAvailable() const;

  const vtkQtChartZoomViewport *getCurrent() const;

  const vtkQtChartZoomViewport *getPrevious();

  const vtkQtChartZoomViewport *getNext();

private:
  vtkQtChartZoomHistoryInternal *Internal;

  int Current; 
  int Allowed; 
};

#endif