dox/Filtering/vtkPlanesIntersection.h

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

  Program:   Visualization Toolkit
  Module:    vtkPlanesIntersection.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.

=========================================================================*/
/*----------------------------------------------------------------------------
 Copyright (c) Sandia Corporation
 See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.
----------------------------------------------------------------------------*/

#ifndef __vtkPlanesIntersection_h
#define __vtkPlanesIntersection_h

#include "vtkPlanes.h"

class vtkPoints;
class vtkPointsProjectedHull;
class vtkCell;

class VTK_FILTERING_EXPORT vtkPlanesIntersection : public vtkPlanes
{
  vtkTypeMacro(vtkPlanesIntersection, vtkPlanes);

public:
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkPlanesIntersection *New();

  void SetRegionVertices(vtkPoints *pts);
  void SetRegionVertices(double *v, int nvertices);
  int GetNumRegionVertices();
  int GetRegionVertices(double *v, int nvertices);

  int IntersectsRegion(vtkPoints *R);

  static int PolygonIntersectsBBox(double bounds[6], vtkPoints *pts);

  static vtkPlanesIntersection *Convert3DCell(vtkCell *cell);

protected:

  static void ComputeNormal(double *p1, double *p2, double *p3, double normal[3]);
  static double EvaluatePlaneEquation(double *x, double *p);
  static void PlaneEquation(double *n, double *x, double *p);
  static int GoodNormal(double *n);
  static int Invert3x3(double M[3][3]);

  vtkPlanesIntersection();
  ~vtkPlanesIntersection();

private:

  int IntersectsBoundingBox(vtkPoints *R);
  int EnclosesBoundingBox(vtkPoints *R);
  int EvaluateFacePlane(int plane, vtkPoints *R);
  int IntersectsProjection(vtkPoints *R, int direction);

  void SetPlaneEquations();
  void ComputeRegionVertices();

  void planesMatrix(int p1, int p2, int p3, double M[3][3]) const;
  int duplicate(double testv[3]) const;
  void planesRHS(int p1, int p2, int p3, double r[3]) const;
  int outsideRegion(double v[3]) ;

  // plane equations
  double *Plane;

  // vertices of convex regions enclosed by the planes, also
  //    the ccw hull of that region projected in 3 orthog. directions
  vtkPointsProjectedHull *regionPts;

  vtkPlanesIntersection(const vtkPlanesIntersection&); // Not implemented
  void operator=(const vtkPlanesIntersection&); // Not implemented
};
#endif

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