dox/Widgets/vtkDistanceRepresentation.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkDistanceRepresentation.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 __vtkDistanceRepresentation_h
#define __vtkDistanceRepresentation_h

#include "vtkWidgetRepresentation.h"

class vtkHandleRepresentation;


class VTK_WIDGETS_EXPORT vtkDistanceRepresentation : public vtkWidgetRepresentation
{
public:

  vtkTypeRevisionMacro(vtkDistanceRepresentation,vtkWidgetRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent);

  virtual double GetDistance() = 0;


  virtual void GetPoint1WorldPosition(double pos[3]) = 0;
  virtual void GetPoint2WorldPosition(double pos[3]) = 0;
  virtual void SetPoint1DisplayPosition(double pos[3]) = 0;
  virtual void SetPoint2DisplayPosition(double pos[3]) = 0;
  virtual void GetPoint1DisplayPosition(double pos[3]) = 0;
  virtual void GetPoint2DisplayPosition(double pos[3]) = 0;


  void SetHandleRepresentation(vtkHandleRepresentation *handle);
  void InstantiateHandleRepresentation();


  vtkGetObjectMacro(Point1Representation,vtkHandleRepresentation);
  vtkGetObjectMacro(Point2Representation,vtkHandleRepresentation);


  vtkSetClampMacro(Tolerance,int,1,100);
  vtkGetMacro(Tolerance,int);


  vtkSetStringMacro(LabelFormat);
  vtkGetStringMacro(LabelFormat);

//BTX -- used to communicate about the state of the representation
  enum {Outside=0,NearP1,NearP2};
//ETX


  virtual void BuildRepresentation();
  virtual int ComputeInteractionState(int X, int Y, int modify=0);
  virtual void StartWidgetInteraction(double e[2]);
  virtual void WidgetInteraction(double e[2]);
  
protected:
  vtkDistanceRepresentation();
  ~vtkDistanceRepresentation();

  // The handle and the rep used to close the handles
  vtkHandleRepresentation *HandleRepresentation;
  vtkHandleRepresentation *Point1Representation;
  vtkHandleRepresentation *Point2Representation;

  // Selection tolerance for the handles
  int Tolerance;

  // Format for printing the distance
  char *LabelFormat;

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

#endif

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