vtkDistanceWidget.h

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

  Program:   Visualization Toolkit
  Module:    vtkDistanceWidget.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 vtkDistanceWidget_h
#define vtkDistanceWidget_h

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

class vtkDistanceRepresentation;
class vtkHandleWidget;
class vtkDistanceWidgetCallback;


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


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

  virtual void SetEnabled(int);

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

  vtkDistanceRepresentation *GetDistanceRepresentation()
    {return reinterpret_cast<vtkDistanceRepresentation*>(this->WidgetRep);}

  void CreateDefaultRepresentation();

  virtual void SetProcessEvents(int);

  enum {Start=0,Define,Manipulate};


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

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

protected:
  vtkDistanceWidget();
  ~vtkDistanceWidget();

  // 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 *Point2Widget;
  vtkDistanceWidgetCallback *DistanceWidgetCallback1;
  vtkDistanceWidgetCallback *DistanceWidgetCallback2;

  // Methods invoked when the handles at the
  // end points of the widget are manipulated
  void StartDistanceInteraction(int handleNum);
  void DistanceInteraction(int handleNum);
  void EndDistanceInteraction(int handleNum);

  friend class vtkDistanceWidgetCallback;

private:
  vtkDistanceWidget(const vtkDistanceWidget&) VTK_DELETE_FUNCTION;
  void operator=(const vtkDistanceWidget&) VTK_DELETE_FUNCTION;
};

#endif