vtkGaussianSplatter.h

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

  Program:   Visualization Toolkit
  Module:    vtkGaussianSplatter.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 vtkGaussianSplatter_h
#define vtkGaussianSplatter_h

#include "vtkImagingHybridModule.h" // For export macro
#include "vtkImageAlgorithm.h"

#define VTK_ACCUMULATION_MODE_MIN 0
#define VTK_ACCUMULATION_MODE_MAX 1
#define VTK_ACCUMULATION_MODE_SUM 2

class vtkDoubleArray;
class vtkCompositeDataSet;
class vtkGaussianSplatterAlgorithm;

class VTKIMAGINGHYBRID_EXPORT vtkGaussianSplatter : public vtkImageAlgorithm
{
public:
  vtkTypeMacro(vtkGaussianSplatter,vtkImageAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  static vtkGaussianSplatter *New();


  void SetSampleDimensions(int i, int j, int k);
  void SetSampleDimensions(int dim[3]);
  vtkGetVectorMacro(SampleDimensions,int,3);


  vtkSetVector6Macro(ModelBounds,double);
  vtkGetVectorMacro(ModelBounds,double,6);


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


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


  vtkSetMacro(ExponentFactor,double);
  vtkGetMacro(ExponentFactor,double);


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


  vtkSetClampMacro(Eccentricity,double,0.001,VTK_DOUBLE_MAX);
  vtkGetMacro(Eccentricity,double);


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


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


  vtkSetMacro(CapValue,double);
  vtkGetMacro(CapValue,double);


  vtkSetClampMacro(AccumulationMode,int,
                   VTK_ACCUMULATION_MODE_MIN,VTK_ACCUMULATION_MODE_SUM);
  vtkGetMacro(AccumulationMode,int);
  void SetAccumulationModeToMin()
    {this->SetAccumulationMode(VTK_ACCUMULATION_MODE_MIN);}
  void SetAccumulationModeToMax()
    {this->SetAccumulationMode(VTK_ACCUMULATION_MODE_MAX);}
  void SetAccumulationModeToSum()
    {this->SetAccumulationMode(VTK_ACCUMULATION_MODE_SUM);}
  const char *GetAccumulationModeAsString();


  vtkSetMacro(NullValue,double);
  vtkGetMacro(NullValue,double);


  void ComputeModelBounds(vtkDataSet *input, vtkImageData *output,
                          vtkInformation *outInfo);
  void ComputeModelBounds(vtkCompositeDataSet *input, vtkImageData *output,
                          vtkInformation *outInfo);


  friend class vtkGaussianSplatterAlgorithm;
  double SamplePoint(double x[3]) //for compilers who can't handle this
    {return (this->*Sample)(x);}
  void SetScalar(int idx, double dist2, double *sPtr)
  {
    double v = (this->*SampleFactor)(this->S) * exp(static_cast<double>
      (this->ExponentFactor*(dist2)/(this->Radius2)));

    if ( ! this->Visited[idx] )
    {
      this->Visited[idx] = 1;
      *sPtr = v;
    }
    else
    {
      switch (this->AccumulationMode)
      {
        case VTK_ACCUMULATION_MODE_MIN:
          if ( *sPtr > v )
          {
            *sPtr = v;
          }
          break;
        case VTK_ACCUMULATION_MODE_MAX:
          if ( *sPtr < v )
          {
            *sPtr = v;
          }
          break;
        case VTK_ACCUMULATION_MODE_SUM:
          *sPtr += v;
          break;
      }
    }//not first visit
  }

protected:
  vtkGaussianSplatter();
  ~vtkGaussianSplatter() override {}

  int FillInputPortInformation(int port, vtkInformation* info) override;
  int RequestInformation (vtkInformation *,
                                  vtkInformationVector **,
                                  vtkInformationVector *) override;
  int RequestData(vtkInformation *,
                          vtkInformationVector **,
                          vtkInformationVector *) override;
  void Cap(vtkDoubleArray *s);

  int SampleDimensions[3]; // dimensions of volume to splat into
  double Radius; // maximum distance splat propagates (as fraction 0->1)
  double ExponentFactor; // scale exponent of gaussian function
  double ModelBounds[6]; // bounding box of splatting dimensions
  vtkTypeBool NormalWarping; // on/off warping of splat via normal
  double Eccentricity;// elliptic distortion due to normals
  vtkTypeBool ScalarWarping; // on/off warping of splat via scalar
  double ScaleFactor; // splat size influenced by scale factor
  vtkTypeBool Capping; // Cap side of volume to close surfaces
  double CapValue; // value to use for capping
  int AccumulationMode; // how to combine scalar values

  double Gaussian(double x[3]);
  double EccentricGaussian(double x[3]);
  double ScalarSampling(double s)
    {return this->ScaleFactor * s;}
  double PositionSampling(double)
    {return this->ScaleFactor;}

private:
  double Radius2;
  double (vtkGaussianSplatter::*Sample)(double x[3]);
  double (vtkGaussianSplatter::*SampleFactor)(double s);
  char *Visited;
  double Eccentricity2;
  double *P;
  double *N;
  double S;
  double Origin[3];
  double Spacing[3];
  double SplatDistance[3];
  double NullValue;

private:
  vtkGaussianSplatter(const vtkGaussianSplatter&) = delete;
  void operator=(const vtkGaussianSplatter&) = delete;
};

#endif