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

  Program:   Visualization Toolkit
  Module:    vtkHyperOctreeFractalSource.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.

=========================================================================*/
/**
 * @class   vtkHyperOctreeFractalSource
 * @brief   Create an octree from a fractal.
 * hyperoctree
 *
 *
 * @sa
 * vtkHyperOctreeSampleFunction
*/

#ifndef vtkHyperOctreeFractalSource_h
#define vtkHyperOctreeFractalSource_h

#include "vtkFiltersSourcesModule.h" // For export macro
#include "vtkHyperOctreeAlgorithm.h"

class vtkImplicitFunction;

class VTKFILTERSSOURCES_EXPORT vtkHyperOctreeFractalSource : public vtkHyperOctreeAlgorithm
{
public:
  vtkTypeMacro(vtkHyperOctreeFractalSource,vtkHyperOctreeAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;

  static vtkHyperOctreeFractalSource *New();

  /**
   * Return the maximum number of levels of the hyperoctree.
   * \post positive_result: result>=1
   */
  int GetMaximumLevel();

  /**
   * Set the maximum number of levels of the hyperoctree. If
   * GetMinLevels()>=levels, GetMinLevels() is changed to levels-1.
   * \pre positive_levels: levels>=1
   * \post is_set: this->GetLevels()==levels
   * \post min_is_valid: this->GetMinLevels()<this->GetLevels()
   */
  void SetMaximumLevel(int levels);

  //@{
  /**
   * Return the minimal number of levels of systematic subdivision.
   * \post positive_result: result>=0
   */
  void SetMinimumLevel(int level);
  int GetMinimumLevel();
  //@}


  //========== Mandelbrot parameters ==========

  //@{
  /**
   * Set the projection from  the 4D space (4 parameters / 2 imaginary numbers)
   * to the axes of the 3D Volume.
   * 0=C_Real, 1=C_Imaginary, 2=X_Real, 4=X_Imaginary
   */
  void SetProjectionAxes(int x, int y, int z);
  void SetProjectionAxes(int a[3]) {this->SetProjectionAxes(a[0],a[1],a[2]);}
  vtkGetVector3Macro(ProjectionAxes, int);
  //@}

  //@{
  /**
   * Imaginary and real value for C (constant in equation)
   * and X (initial value).
   */
  vtkSetVector4Macro(OriginCX, double);
  vtkGetVector4Macro(OriginCX, double);
  //@}

  //@{
  /**
   * Just a different way of setting the sample.
   * This sets the size of the 4D volume.
   * SampleCX is computed from size and extent.
   * Size is ignored when a dimension i 0 (collapsed).
   */
  vtkSetVector4Macro(SizeCX, double);
  vtkGetVector4Macro(SizeCX, double);
  //@}

  //@{
  /**
   * The maximum number of cycles run to see if the value goes over 2
   */
  vtkSetClampMacro(MaximumNumberOfIterations, unsigned short, 1, 255);
  vtkGetMacro(MaximumNumberOfIterations, unsigned char);
  //@}

  //@{
  /**
   * Create a 2D or 3D fractal.
   */
  vtkSetClampMacro(Dimension, int, 2, 3);
  vtkGetMacro(Dimension, int);
  //@}

  //@{
  /**
   * Controls when a leaf gets subdivided.  If the corner values span
   * a larger range than this value, the leaf is subdivided.  This
   * defaults to 2.
   */
  vtkSetMacro(SpanThreshold, double);
  vtkGetMacro(SpanThreshold, double);
  //@}

protected:
  vtkHyperOctreeFractalSource();
  ~vtkHyperOctreeFractalSource() VTK_OVERRIDE;

  int RequestInformation (vtkInformation * vtkNotUsed(request),
                          vtkInformationVector ** vtkNotUsed( inputVector ),
                          vtkInformationVector *outputVector) VTK_OVERRIDE;

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

  void Subdivide(vtkHyperOctreeCursor *cursor,
                 int level, vtkHyperOctree *output,
                 double* origin, double* size,
                 float* cornerVals);

  int MaximumLevel;
  int MinimumLevel;
  int Dimension;

  int ProjectionAxes[3];

  unsigned char MaximumNumberOfIterations;

  // Complex constant/initial-value at origin.
  double OriginCX[4];

  // A temporary vector that is computed as needed.
  // It is used to return a vector.
  double SizeCX[4];

  float EvaluateWorldPoint(double p[3]);
  float EvaluateSet(double p[4]);

  double Origin[3];
  double Size[3];

  double SpanThreshold;

private:
  vtkHyperOctreeFractalSource(const vtkHyperOctreeFractalSource&) VTK_DELETE_FUNCTION;
  void operator=(const vtkHyperOctreeFractalSource&) VTK_DELETE_FUNCTION;
};

#endif