vtkExtractSelectedFrustum.h

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

  Program:   Visualization Toolkit
  Module:    vtkExtractSelectedFrustum.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 vtkExtractSelectedFrustum_h
#define vtkExtractSelectedFrustum_h

#include "vtkFiltersGeneralModule.h" // For export macro
#include "vtkExtractSelectionBase.h"

class vtkPlanes;
class vtkInformation;
class vtkInformationVector;
class vtkCell;
class vtkPoints;
class vtkDoubleArray;

class VTKFILTERSGENERAL_EXPORT vtkExtractSelectedFrustum : public vtkExtractSelectionBase
{
public:
  static vtkExtractSelectedFrustum *New();
  vtkTypeMacro(vtkExtractSelectedFrustum, vtkExtractSelectionBase);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  vtkMTimeType GetMTime() override;


  virtual void SetFrustum(vtkPlanes*);
  vtkGetObjectMacro(Frustum,vtkPlanes);

  void CreateFrustum(double vertices[32]);


  vtkGetObjectMacro(ClipPoints, vtkPoints);


  vtkSetMacro(FieldType,int);
  vtkGetMacro(FieldType,int);


  vtkSetMacro(ContainingCells,int);
  vtkGetMacro(ContainingCells,int);

  int OverallBoundsTest(double *bounds);


  vtkSetMacro(ShowBounds,vtkTypeBool);
  vtkGetMacro(ShowBounds,vtkTypeBool);
  vtkBooleanMacro(ShowBounds,vtkTypeBool);


  vtkSetMacro(InsideOut,vtkTypeBool);
  vtkGetMacro(InsideOut,vtkTypeBool);
  vtkBooleanMacro(InsideOut,vtkTypeBool);

protected:
  vtkExtractSelectedFrustum(vtkPlanes *f=nullptr);
  ~vtkExtractSelectedFrustum() override;

  // sets up output dataset
  int RequestDataObject(vtkInformation* request,
                        vtkInformationVector** inputVector,
                        vtkInformationVector* outputVector) override;

  //execution
  int RequestData(vtkInformation *,
                          vtkInformationVector **, vtkInformationVector *) override;
  int ABoxFrustumIsect(double bounds[], vtkCell *cell);
  int FrustumClipPolygon(int nverts,
                         double *ivlist, double *wvlist, double *ovlist);
  void PlaneClipPolygon(int nverts, double *ivlist,
                        int pid, int &noverts, double *ovlist);
  void PlaneClipEdge(double *V0, double *V1,
                     int pid, int &noverts, double *overts);
  int IsectDegenerateCell(vtkCell *cell);


  //used in CreateFrustum
  void ComputePlane(int idx,
                    double v0[3], double v1[2], double v2[3],
                    vtkPoints *points, vtkDoubleArray *norms);

  //modes
  int FieldType;
  int ContainingCells;
  vtkTypeBool InsideOut;

  //used internally
  vtkPlanes *Frustum;
  int np_vertids[6][2];

  //for debugging
  vtkPoints *ClipPoints;
  int NumRejects;
  int NumIsects;
  int NumAccepts;
  vtkTypeBool ShowBounds;

private:
  vtkExtractSelectedFrustum(const vtkExtractSelectedFrustum&) = delete;
  void operator=(const vtkExtractSelectedFrustum&) = delete;

};

#endif