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graphics/vtkHull.h

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00001 /*=========================================================================
00002 
00003   Program:   Visualization Toolkit
00004   Module:    $RCSfile: vtkHull.h,v $
00005   Language:  C++
00006 
00007 
00008 Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
00009 All rights reserved.
00010 
00011 Redistribution and use in source and binary forms, with or without
00012 modification, are permitted provided that the following conditions are met:
00013 
00014  * Redistributions of source code must retain the above copyright notice,
00015    this list of conditions and the following disclaimer.
00016 
00017  * Redistributions in binary form must reproduce the above copyright notice,
00018    this list of conditions and the following disclaimer in the documentation
00019    and/or other materials provided with the distribution.
00020 
00021  * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
00022    of any contributors may be used to endorse or promote products derived
00023    from this software without specific prior written permission.
00024 
00025  * Modified source versions must be plainly marked as such, and must not be
00026    misrepresented as being the original software.
00027 
00028 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
00029 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00030 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00031 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
00032 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00033 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00034 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00035 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00036 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00037 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00038 
00039 =========================================================================*/
00071 #ifndef __vtkHull_h
00072 #define __vtkHull_h
00073 
00074 #include "vtkPolyDataToPolyDataFilter.h"
00075 
00076 class vtkPlanes;
00077 
00078 class VTK_EXPORT vtkHull : public vtkPolyDataToPolyDataFilter
00079 {
00080 public:
00081   static vtkHull *New();
00082   vtkTypeMacro(vtkHull,vtkPolyDataToPolyDataFilter);
00083   void PrintSelf(ostream& os, vtkIndent indent);
00084 
00086   void RemoveAllPlanes( void );
00087 
00097   int  AddPlane( float A, float B, float C );
00098   int  AddPlane( float plane[3] );
00099 
00106   void SetPlane( int i, float A, float B, float C );
00107   void SetPlane( int i, float plane[3] );
00108 
00111   int AddPlane( float A, float B, float C, float D );
00112   int AddPlane( float plane[3], float D );
00113   void SetPlane( int i, float A, float B, float C, float D );
00114   void SetPlane( int i, float plane[3], float D );
00115 
00118   void SetPlanes( vtkPlanes *planes );
00119 
00121   vtkGetMacro( NumberOfPlanes, int );
00122   
00127   void AddCubeVertexPlanes();
00128 
00133   void AddCubeEdgePlanes();
00134 
00137   void AddCubeFacePlanes();
00138 
00146   void AddRecursiveSpherePlanes( int level );
00147 
00156   void GenerateHull(vtkPolyData *pd, float *bounds);
00157   void GenerateHull(vtkPolyData *pd, float xmin, float xmax,
00158                     float ymin, float ymax, float zmin, float zmax);
00159 
00160 protected:
00161   vtkHull();
00162   ~vtkHull();
00163   vtkHull(const vtkHull&) {};
00164   void operator=(const vtkHull&) {};
00165 
00166   // The planes - 4 doubles per plane for A, B, C, D
00167   double     *Planes;
00168 
00169   // This indicates the current size (in planes - 4*sizeof(float)) of 
00170   // the this->Planes array. Planes are allocated in chunks so that the
00171   // array does not need to be reallocated every time a new plane is added
00172   int       PlanesStorageSize;
00173 
00174   // The number of planes that have been added
00175   int       NumberOfPlanes;
00176 
00177   // Internal method used to find the position of each plane
00178   void      ComputePlaneDistances();
00179 
00180   // Internal method used to create the actual polygons from the set 
00181   // of planes
00182   void      ClipPolygonsFromPlanes( vtkPoints *points, vtkCellArray *polys,
00183                                     float *bounds );
00184 
00185   // Internal method used to create the initial "big" polygon from the
00186   // plane equation. This polygon is clipped by all other planes to form
00187   // the final polygon (or it may be clipped entirely)
00188   void      CreateInitialPolygon( double *, int, float * );
00189 
00190   // The method that does it all...
00191   void      Execute();
00192 };
00193 
00194 #endif

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