---

Rendering/vtkPicker.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkPicker.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 __vtkPicker_h
#define __vtkPicker_h

#include "vtkAbstractPropPicker.h"

class vtkAbstractMapper3D;
class vtkDataSet;
class vtkTransform;
class vtkActorCollection;
class vtkProp3DCollection;
class vtkPoints;

class VTK_RENDERING_EXPORT vtkPicker : public vtkAbstractPropPicker
{
public:
  static vtkPicker *New();
  vtkTypeRevisionMacro(vtkPicker,vtkAbstractPropPicker);
  void PrintSelf(ostream& os, vtkIndent indent);


  vtkSetMacro(Tolerance,float);
  vtkGetMacro(Tolerance,float);


  vtkGetVectorMacro(MapperPosition,float,3);


  vtkGetObjectMacro(Mapper,vtkAbstractMapper3D);


  vtkGetObjectMacro(DataSet,vtkDataSet);

  vtkProp3DCollection *GetProp3Ds() {return this->Prop3Ds;};

  vtkActorCollection *GetActors();

  vtkPoints *GetPickedPositions() {return this->PickedPositions;};
  

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


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

  void MarkPicked(vtkAssemblyPath *path, vtkProp3D *p, vtkAbstractMapper3D *m, 
                  float tMin, float mapperPos[3]);
  virtual float IntersectWithLine(float p1[3], float p2[3], float tol, 
                                  vtkAssemblyPath *path, vtkProp3D *p, 
                                  vtkAbstractMapper3D *m);
  virtual void Initialize();

  float Tolerance; //tolerance for computation (% of window)
  float MapperPosition[3]; //selection point in untransformed coordinates

  vtkAbstractMapper3D *Mapper; //selected mapper (if the prop has a mapper)
  vtkDataSet *DataSet; //selected dataset (if there is one)

  float GlobalTMin; //parametric coordinate along pick ray where hit occured
  vtkTransform *Transform; //use to perform ray transformation
  vtkActorCollection *Actors; //candidate actors (based on bounding box)
  vtkProp3DCollection *Prop3Ds; //candidate actors (based on bounding box)
  vtkPoints *PickedPositions; // candidate positions
  
private:
  vtkPicker(const vtkPicker&);  // Not implemented.
  void operator=(const vtkPicker&);  // Not implemented.
};


#endif

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