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graphics/vtkHull.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkHull.h,v $
  Language:  C++


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
#ifndef __vtkHull_h
#define __vtkHull_h

#include "vtkPolyDataToPolyDataFilter.h"

class vtkPlanes;

class VTK_EXPORT vtkHull : public vtkPolyDataToPolyDataFilter
{
public:
  static vtkHull *New();
  vtkTypeMacro(vtkHull,vtkPolyDataToPolyDataFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  void RemoveAllPlanes( void );

  int  AddPlane( float A, float B, float C );
  int  AddPlane( float plane[3] );

  void SetPlane( int i, float A, float B, float C );
  void SetPlane( int i, float plane[3] );

  int AddPlane( float A, float B, float C, float D );
  int AddPlane( float plane[3], float D );
  void SetPlane( int i, float A, float B, float C, float D );
  void SetPlane( int i, float plane[3], float D );

  void SetPlanes( vtkPlanes *planes );

  vtkGetMacro( NumberOfPlanes, int );
  
  void AddCubeVertexPlanes();

  void AddCubeEdgePlanes();

  void AddCubeFacePlanes();

  void AddRecursiveSpherePlanes( int level );

  void GenerateHull(vtkPolyData *pd, float *bounds);
  void GenerateHull(vtkPolyData *pd, float xmin, float xmax,
                    float ymin, float ymax, float zmin, float zmax);

protected:
  vtkHull();
  ~vtkHull();
  vtkHull(const vtkHull&) {};
  void operator=(const vtkHull&) {};

  // The planes - 4 doubles per plane for A, B, C, D
  double     *Planes;

  // This indicates the current size (in planes - 4*sizeof(float)) of 
  // the this->Planes array. Planes are allocated in chunks so that the
  // array does not need to be reallocated every time a new plane is added
  int       PlanesStorageSize;

  // The number of planes that have been added
  int       NumberOfPlanes;

  // Internal method used to find the position of each plane
  void      ComputePlaneDistances();

  // Internal method used to create the actual polygons from the set 
  // of planes
  void      ClipPolygonsFromPlanes( vtkPoints *points, vtkCellArray *polys,
                                    float *bounds );

  // Internal method used to create the initial "big" polygon from the
  // plane equation. This polygon is clipped by all other planes to form
  // the final polygon (or it may be clipped entirely)
  void      CreateInitialPolygon( double *, int, float * );

  // The method that does it all...
  void      Execute();
};

#endif

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