dox/Rendering/vtkCellPicker.h

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

  Program:   Visualization Toolkit
  Module:    vtkCellPicker.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.

=========================================================================*/
#ifndef __vtkCellPicker_h
#define __vtkCellPicker_h

#include "vtkPicker.h"

class vtkMapper;
class vtkTexture;
class vtkAbstractVolumeMapper;
class vtkImageActor;
class vtkPlaneCollection;
class vtkPiecewiseFunction;
class vtkDataArray;
class vtkDoubleArray;
class vtkIdList;
class vtkCell;
class vtkGenericCell;
class vtkImageData;
class vtkAbstractCellLocator;
class vtkCollection;

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


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

  void AddLocator(vtkAbstractCellLocator *locator);

  void RemoveLocator(vtkAbstractCellLocator *locator);

  void RemoveAllLocators();


  vtkSetMacro(VolumeOpacityIsovalue, double);
  vtkGetMacro(VolumeOpacityIsovalue, double);


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


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


  vtkGetMacro(ClippingPlaneId, int);


  vtkGetVectorMacro(PickNormal, double, 3);


  vtkGetVector3Macro(MapperNormal, double);


  vtkGetVector3Macro(PointIJK, int);


  vtkGetVector3Macro(CellIJK, int);


  vtkGetMacro(PointId, vtkIdType);


  vtkGetMacro(CellId, vtkIdType);


  vtkGetMacro(SubId, int);


  vtkGetVector3Macro(PCoords, double);

  vtkTexture *GetTexture() { return this->Texture; };


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

protected:
  vtkCellPicker();
  ~vtkCellPicker();

  void Initialize();

  virtual void ResetPickInfo();

  virtual double IntersectWithLine(double p1[3], double p2[3], double tol, 
                                  vtkAssemblyPath *path, vtkProp3D *p, 
                                  vtkAbstractMapper3D *m);

  virtual double IntersectActorWithLine(const double p1[3], const double p2[3],
                                        double t1, double t2, double tol, 
                                        vtkProp3D *prop, vtkMapper *mapper);

  virtual double IntersectVolumeWithLine(const double p1[3],
                                         const double p2[3],
                                         double t1, double t2,
                                         vtkProp3D *prop, 
                                         vtkAbstractVolumeMapper *mapper);

  virtual double IntersectImageActorWithLine(const double p1[3],
                                             const double p2[3],
                                             double t1, double t2,
                                             vtkImageActor *imageActor);

  virtual double IntersectProp3DWithLine(const double p1[3],
                                         const double p2[3],
                                         double t1, double t2, double tol, 
                                         vtkProp3D *prop,
                                         vtkAbstractMapper3D *mapper);

  static int ClipLineWithPlanes(vtkPlaneCollection *planes,
                                const double p1[3], const double p2[3],
                                double &t1, double &t2, int& planeId);

  static int ClipLineWithExtent(const int extent[6],
                                const double x1[3], const double x2[3],
                                double &t1, double &t2, int &planeId);

  static int ComputeSurfaceNormal(vtkDataSet *data, vtkCell *cell,
                                  const double *weights, double normal[3]);

  static int ComputeSurfaceTCoord(vtkDataSet *data, vtkCell *cell,
                                  const double *weights, double tcoord[3]);

  static int HasSubCells(int cellType);

  static int GetNumberOfSubCells(vtkIdList *pointIds, int cellType);

  static void GetSubCell(vtkDataSet *data, vtkIdList *pointIds, int subId,
                         int cellType, vtkGenericCell *cell);

  static void SubCellFromCell(vtkGenericCell *cell, int subId);

  void SetImageDataPickInfo(const double x[3], const int extent[6]);

  double ComputeVolumeOpacity(const int xi[3], const double pcoords[3],
                              vtkImageData *data, vtkDataArray *scalars,
                              vtkPiecewiseFunction *scalarOpacity,
                              vtkPiecewiseFunction *gradientOpacity);

  vtkCollection *Locators;

  double VolumeOpacityIsovalue;
  int UseVolumeGradientOpacity;
  int PickClippingPlanes;
  int ClippingPlaneId;

  vtkIdType PointId;
  vtkIdType CellId;
  int SubId;
  double PCoords[3];

  int PointIJK[3];
  int CellIJK[3];

  double PickNormal[3];
  double MapperNormal[3];

  vtkTexture *Texture;
  int PickTextureData;

private:
  void ResetCellPickerInfo();

  vtkGenericCell *Cell; //used to accelerate picking
  vtkIdList *PointIds; // used to accelerate picking
  vtkDoubleArray *Gradients; //used in volume picking
  
private:
  vtkCellPicker(const vtkCellPicker&);  // Not implemented.
  void operator=(const vtkCellPicker&);  // Not implemented.
};

#endif

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