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

  Program:   Visualization Toolkit
  Module:    vtkAngleWidget.h,v

  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.

=========================================================================*/
#ifndef vtkAngleWidget_h
#define vtkAngleWidget_h

#include "vtkInteractionWidgetsModule.h" // For export macro
#include "vtkAbstractWidget.h"

class vtkAngleRepresentation;
class vtkHandleWidget;
class vtkAngleWidgetCallback;


class VTKINTERACTIONWIDGETS_EXPORT vtkAngleWidget : public vtkAbstractWidget
{
public:
  static vtkAngleWidget *New();


  vtkTypeMacro(vtkAngleWidget,vtkAbstractWidget);
  void PrintSelf(ostream& os, vtkIndent indent);

  virtual void SetEnabled(int);


  void SetRepresentation(vtkAngleRepresentation *r)
    {this->Superclass::SetWidgetRepresentation(reinterpret_cast<vtkWidgetRepresentation*>(r));}

  void CreateDefaultRepresentation();


  vtkAngleRepresentation *GetAngleRepresentation()
    {return reinterpret_cast<vtkAngleRepresentation*>(this->WidgetRep);}

  int IsAngleValid();

  virtual void SetProcessEvents(int);


  enum {Start=0,Define,Manipulate};
  //ETX


  virtual void SetWidgetStateToStart();
  virtual void SetWidgetStateToManipulate();


  virtual int GetWidgetState()
    {return this->WidgetState;}

protected:
  vtkAngleWidget();
  ~vtkAngleWidget();

  // The state of the widget
  int WidgetState;
  int CurrentHandle;

  // Callback interface to capture events when
  // placing the widget.
  static void AddPointAction(vtkAbstractWidget*);
  static void MoveAction(vtkAbstractWidget*);
  static void EndSelectAction(vtkAbstractWidget*);

  // The positioning handle widgets
  vtkHandleWidget *Point1Widget;
  vtkHandleWidget *CenterWidget;
  vtkHandleWidget *Point2Widget;
  vtkAngleWidgetCallback *AngleWidgetCallback1;
  vtkAngleWidgetCallback *AngleWidgetCenterCallback;
  vtkAngleWidgetCallback *AngleWidgetCallback2;

  // Methods invoked when the handles at the
  // end points of the widget are manipulated
  void StartAngleInteraction(int handleNum);
  void AngleInteraction(int handleNum);
  void EndAngleInteraction(int handleNum);

//BTX
  friend class vtkAngleWidgetCallback;
//ETX

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

#endif