---

Hybrid/vtkXYPlotWidget.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkXYPlotWidget.h,v $
  Language:  C++

  Copyright (c) 1993-2002 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.

=========================================================================*/
#ifndef __vtkXYPlotWidget_h
#define __vtkXYPlotWidget_h

#include "vtkInteractorObserver.h"
class vtkXYPlotActor;

class VTK_HYBRID_EXPORT vtkXYPlotWidget : public vtkInteractorObserver
{
public:
  static vtkXYPlotWidget *New();
  vtkTypeRevisionMacro(vtkXYPlotWidget,vtkInteractorObserver);
  void PrintSelf(ostream& os, vtkIndent indent);


  virtual void SetXYPlotActor(vtkXYPlotActor *scalarbar);
  vtkGetObjectMacro(XYPlotActor,vtkXYPlotActor);
  
  virtual void SetEnabled(int);

protected:
  vtkXYPlotWidget();
  ~vtkXYPlotWidget();

  // the actor that is used
  vtkXYPlotActor *XYPlotActor;

  //handles the events
  static void ProcessEvents(vtkObject* object, 
                            unsigned long event,
                            void* clientdata, 
                            void* calldata);

  // ProcessEvents() dispatches to these methods.
  void OnLeftButtonDown();
  void OnLeftButtonUp();
  void OnMouseMove();

  // used to compute relative movements
  float StartPosition[2];
  
//BTX - manage the state of the widget
  int State;
  enum WidgetState
  {
    Moving=0,
    AdjustingP1,
    AdjustingP2,
    AdjustingP3,
    AdjustingP4,
    AdjustingE1,
    AdjustingE2,
    AdjustingE3,
    AdjustingE4,
    Inside,
    Outside
  };
//ETX

  // use to determine what state the mouse is over, edge1 p1, etc.
  // returns a state from the WidgetState enum above
  int ComputeStateBasedOnPosition(int X, int Y, int *pos1, int *pos2);

  // set the cursor to the correct shape based on State argument
  void SetCursor(int State);

private:
  vtkXYPlotWidget(const vtkXYPlotWidget&);  //Not implemented
  void operator=(const vtkXYPlotWidget&);  //Not implemented
};

#endif

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