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

  Program:   Visualization Toolkit
  Module:    vtkPropPicker.h

  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.

=========================================================================*/
// .NAME vtkPropPicker - pick an actor/prop using graphics hardware
// .SECTION Description
// vtkPropPicker is used to pick an actor/prop given a selection
// point (in display coordinates) and a renderer. This class uses
// graphics hardware/rendering system to pick rapidly (as compared
// to using ray casting as does vtkCellPicker and vtkPointPicker).
// This class determines the actor/prop and pick position in world
// coordinates; point and cell ids are not determined.

// .SECTION See Also 
// vtkPicker vtkWorldPointPicker vtkCellPicker vtkPointPicker 

#ifndef __vtkPropPicker_h
#define __vtkPropPicker_h

#include "vtkAbstractPropPicker.h"

class vtkProp;
class vtkWorldPointPicker;

class VTK_RENDERING_EXPORT vtkPropPicker : public vtkAbstractPropPicker
{
public:
  static vtkPropPicker *New();

  vtkTypeMacro(vtkPropPicker,vtkAbstractPropPicker);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Perform the pick and set the PickedProp ivar. If something is picked, a
  // 1 is returned, otherwise 0 is returned.  Use the GetViewProp() method
  // to get the instance of vtkProp that was picked.  Props are picked from
  // the renderers list of pickable Props.
  int PickProp(double selectionX, double selectionY, vtkRenderer *renderer);  

  // Description:
  // Perform a pick from the user-provided list of vtkProps and not from the
  // list of vtkProps that the render maintains.
  int PickProp(double selectionX, double selectionY, vtkRenderer *renderer, 
               vtkPropCollection* pickfrom);  

  // Description:
  // Overide superclasses' Pick() method.
  int Pick(double selectionX, double selectionY, double selectionZ, 
           vtkRenderer *renderer);  
  int Pick(double selectionPt[3], vtkRenderer *renderer)
    { return this->Pick( selectionPt[0], 
                         selectionPt[1], selectionPt[2], renderer); };  

protected:
  vtkPropPicker();
  ~vtkPropPicker();

  void Initialize();
  
  vtkPropCollection* PickFromProps;
  
  // Used to get x-y-z pick position
  vtkWorldPointPicker *WorldPointPicker;
private:
  vtkPropPicker(const vtkPropPicker&);  // Not implemented.
  void operator=(const vtkPropPicker&);  // Not implemented.
};

#endif