dox/Graphics/vtkDelaunay2D.h

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

  Program:   Visualization Toolkit
  Module:    vtkDelaunay2D.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 __vtkDelaunay2D_h
#define __vtkDelaunay2D_h

#include "vtkPolyDataAlgorithm.h"

class vtkAbstractTransform;
class vtkCellArray;
class vtkIdList;
class vtkPointSet;

#define VTK_DELAUNAY_XY_PLANE 0
#define VTK_SET_TRANSFORM_PLANE 1
#define VTK_BEST_FITTING_PLANE 2

class VTK_GRAPHICS_EXPORT vtkDelaunay2D : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkDelaunay2D,vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkDelaunay2D *New();

  void SetSource(vtkPolyData *);

  void SetSourceConnection(vtkAlgorithmOutput *algOutput);

  vtkPolyData *GetSource();
  

  vtkSetClampMacro(Alpha,double,0.0,VTK_DOUBLE_MAX);
  vtkGetMacro(Alpha,double);


  vtkSetClampMacro(Tolerance,double,0.0,1.0);
  vtkGetMacro(Tolerance,double);


  vtkSetClampMacro(Offset,double,0.75,VTK_DOUBLE_MAX);
  vtkGetMacro(Offset,double);


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


  virtual void SetTransform(vtkAbstractTransform*);
  vtkGetObjectMacro(Transform, vtkAbstractTransform);


  vtkSetClampMacro(ProjectionPlaneMode,int,
                   VTK_DELAUNAY_XY_PLANE,VTK_BEST_FITTING_PLANE);
  vtkGetMacro(ProjectionPlaneMode,int);

protected:
  vtkDelaunay2D();
  ~vtkDelaunay2D();

  virtual int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);

  vtkAbstractTransform * ComputeBestFittingPlane(vtkPointSet *input);

  double Alpha;
  double Tolerance;
  int BoundingTriangulation;
  double Offset;

  vtkAbstractTransform *Transform;

  int ProjectionPlaneMode; //selects the plane in 3D where the Delaunay triangulation will be computed.

private:
  vtkPolyData *Mesh; //the created mesh
  double *Points;    //the raw points in double precision
  void SetPoint(vtkIdType id, double *x)
    {vtkIdType idx=3*id; 
    this->Points[idx] = x[0];
    this->Points[idx+1] = x[1];
    this->Points[idx+2] = x[2];
    }
      
  void GetPoint(vtkIdType id, double x[3])
    {double *ptr = this->Points + 3*id;
    x[0] = *ptr++;
    x[1] = *ptr++;
    x[2] = *ptr;
    }

  int NumberOfDuplicatePoints;
  int NumberOfDegeneracies;

  int *RecoverBoundary(vtkPolyData *source);
  int RecoverEdge(vtkIdType p1, vtkIdType p2);
  void FillPolygons(vtkCellArray *polys, int *triUse);

  int InCircle (double x[3], double x1[3], double x2[3], double x3[3]);
  vtkIdType FindTriangle(double x[3], vtkIdType ptIds[3], vtkIdType tri,
                         double tol, vtkIdType nei[3], vtkIdList *neighbors);
  void CheckEdge(vtkIdType ptId, double x[3], vtkIdType p1, vtkIdType p2,
                 vtkIdType tri);

  virtual int FillInputPortInformation(int, vtkInformation*);

private:
  vtkDelaunay2D(const vtkDelaunay2D&);  // Not implemented.
  void operator=(const vtkDelaunay2D&);  // Not implemented.
};

#endif