---

Rendering/vtkAbstractPicker.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkAbstractPicker.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 __vtkAbstractPicker_h
#define __vtkAbstractPicker_h

#include "vtkObject.h"

class vtkRenderer;
class vtkProp;
class vtkPropCollection;

class VTK_RENDERING_EXPORT vtkAbstractPicker : public vtkObject
{
public:
  vtkTypeRevisionMacro(vtkAbstractPicker,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);


  vtkGetObjectMacro(Renderer,vtkRenderer);


  vtkGetVectorMacro(SelectionPoint,float,3);


  vtkGetVectorMacro(PickPosition,float,3);


  virtual int Pick(float selectionX, float selectionY, float selectionZ, 
                   vtkRenderer *renderer) = 0;


  int Pick(float selectionPt[3], vtkRenderer *ren)
    {return this->Pick(selectionPt[0],selectionPt[1],selectionPt[2],ren);};  

  void SetStartPickMethod(void (*f)(void *), void *arg);

  void SetPickMethod(void (*f)(void *), void *arg);

  void SetEndPickMethod(void (*f)(void *), void *arg);

  void SetStartPickMethodArgDelete(void (*f)(void *));

  void SetPickMethodArgDelete(void (*f)(void *));

  void SetEndPickMethodArgDelete(void (*f)(void *));


  vtkSetMacro(PickFromList,int);
  vtkGetMacro(PickFromList,int);
  vtkBooleanMacro(PickFromList,int);

  void InitializePickList();

  void AddPickList(vtkProp *);

  void DeletePickList(vtkProp *);
  
  vtkPropCollection *GetPickList() {return this->PickList;}

protected:
  vtkAbstractPicker();
  ~vtkAbstractPicker();

  virtual void Initialize();

  vtkRenderer *Renderer; //pick occurred in this renderer's viewport
  float SelectionPoint[3]; //selection point in window (pixel) coordinates
  float PickPosition[3]; //selection point in world coordinates
  
  // the following are used to manage invocation of pick methods
  unsigned long StartPickTag;
  unsigned long PickTag;
  unsigned long EndPickTag;
  
  // use the following to control picking from a list
  int PickFromList;
  vtkPropCollection *PickList;
private:
  vtkAbstractPicker(const vtkAbstractPicker&);  // Not implemented.
  void operator=(const vtkAbstractPicker&);  // Not implemented.
};

#endif

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