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

  Program:   Visualization Toolkit
  Module:    vtkContourGrid.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   vtkContourGrid
 * @brief   generate isosurfaces/isolines from scalar values (specialized for unstructured grids)
 *
 * vtkContourGrid is a filter that takes as input datasets of type
 * vtkUnstructuredGrid and generates on output isosurfaces and/or
 * isolines. The exact form of the output depends upon the dimensionality of
 * the input data.  Data consisting of 3D cells will generate isosurfaces,
 * data consisting of 2D cells will generate isolines, and data with 1D or 0D
 * cells will generate isopoints. Combinations of output type are possible if
 * the input dimension is mixed.
 *
 * To use this filter you must specify one or more contour values.
 * You can either use the method SetValue() to specify each contour
 * value, or use GenerateValues() to generate a series of evenly
 * spaced contours. It is also possible to accelerate the operation of
 * this filter (at the cost of extra memory) by using a
 * vtkScalarTree. A scalar tree is used to quickly locate cells that
 * contain a contour surface. This is especially effective if multiple
 * contours are being extracted. If you want to use a scalar tree,
 * invoke the method UseScalarTreeOn().
 *
 *
 * @warning
 * For unstructured data or structured grids, normals and gradients
 * are not computed. Use vtkPolyDataNormals to compute the surface
 * normals of the resulting isosurface.
 *
 * @sa
 * vtkMarchingContourFilter
 * vtkMarchingCubes vtkSliceCubes vtkDividingCubes vtkMarchingSquares
 * vtkImageMarchingCubes
*/

#ifndef vtkContourGrid_h
#define vtkContourGrid_h

#include "vtkFiltersCoreModule.h" // For export macro
#include "vtkPolyDataAlgorithm.h"

#include "vtkContourValues.h" // Needed for inline methods

class vtkEdgeTable;
class vtkScalarTree;
class vtkIncrementalPointLocator;

class VTKFILTERSCORE_EXPORT vtkContourGrid : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkContourGrid,vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;

  /**
   * Construct object with initial range (0,1) and single contour value
   * of 0.0.
   */
  static vtkContourGrid *New();

  //@{
  /**
   * Methods to set / get contour values.
   */
  void SetValue(int i, double value);
  double GetValue(int i);
  double *GetValues();
  void GetValues(double *contourValues);
  void SetNumberOfContours(int number);
  int GetNumberOfContours();
  void GenerateValues(int numContours, double range[2]);
  void GenerateValues(int numContours, double rangeStart, double rangeEnd);
  //@}

  /**
   * Modified GetMTime Because we delegate to vtkContourValues
   */
  vtkMTimeType GetMTime() VTK_OVERRIDE;

  //@{
  /**
   * Set/Get the computation of normals. Normal computation is fairly
   * expensive in both time and storage. If the output data will be
   * processed by filters that modify topology or geometry, it may be
   * wise to turn Normals and Gradients off.
   */
  vtkSetMacro(ComputeNormals,int);
  vtkGetMacro(ComputeNormals,int);
  vtkBooleanMacro(ComputeNormals,int);
  //@}

  //@{
  /**
   * Set/Get the computation of gradients. Gradient computation is
   * fairly expensive in both time and storage. Note that if
   * ComputeNormals is on, gradients will have to be calculated, but
   * will not be stored in the output dataset.  If the output data
   * will be processed by filters that modify topology or geometry, it
   * may be wise to turn Normals and Gradients off.  @deprecated
   * ComputeGradients is not used so these methods don't affect
   * anything (VTK 6.0).
   */
  vtkSetMacro(ComputeGradients,int);
  vtkGetMacro(ComputeGradients,int);
  vtkBooleanMacro(ComputeGradients,int);
  //@}

  //@{
  /**
   * Set/Get the computation of scalars.
   */
  vtkSetMacro(ComputeScalars,int);
  vtkGetMacro(ComputeScalars,int);
  vtkBooleanMacro(ComputeScalars,int);
  //@}

  //@{
  /**
   * Enable the use of a scalar tree to accelerate contour extraction.
   */
  vtkSetMacro(UseScalarTree,int);
  vtkGetMacro(UseScalarTree,int);
  vtkBooleanMacro(UseScalarTree,int);
  //@}

  //@{
  /**
   * Specify the instance of vtkScalarTree to use. If not specified
   * and UseScalarTree is enabled, then a vtkSimpleScalarTree will be used.
   */
  void SetScalarTree(vtkScalarTree *sTree);
  vtkGetObjectMacro(ScalarTree,vtkScalarTree);
  //@}

  //@{
  /**
   * Set / get a spatial locator for merging points. By default,
   * an instance of vtkMergePoints is used.
   */
  void SetLocator(vtkIncrementalPointLocator *locator);
  vtkGetObjectMacro(Locator,vtkIncrementalPointLocator);
  //@}

  //@{
  /**
   * If this is enabled (by default), the output will be triangles
   * otherwise, the output will be the intersection polygons
   * WARNING: if the cutting function is not a plane, the output
   * will be 3D poygons, which might be nice to look at but hard
   * to compute with downstream.
   */
  vtkSetMacro(GenerateTriangles,int);
  vtkGetMacro(GenerateTriangles,int);
  vtkBooleanMacro(GenerateTriangles,int);
  //@}

  /**
   * Create default locator. Used to create one when none is
   * specified. The locator is used to merge coincident points.
   */
  void CreateDefaultLocator();

  //@{
  /**
   * Set/get the desired precision for the output types. See the documentation
   * for the vtkAlgorithm::DesiredOutputPrecision enum for an explanation of
   * the available precision settings.
   */
  void SetOutputPointsPrecision(int precision);
  int GetOutputPointsPrecision() const;
  //@}

protected:
  vtkContourGrid();
  ~vtkContourGrid() VTK_OVERRIDE;

  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *) VTK_OVERRIDE;
  int FillInputPortInformation(int port, vtkInformation *info) VTK_OVERRIDE;

  vtkContourValues *ContourValues;
  int ComputeNormals;
  int ComputeGradients;
  int ComputeScalars;
  int GenerateTriangles;

  vtkIncrementalPointLocator *Locator;

  int UseScalarTree;
  vtkScalarTree *ScalarTree;

  int OutputPointsPrecision;
  vtkEdgeTable *EdgeTable;

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

/**
 * Set a particular contour value at contour number i. The index i ranges
 * between 0<=i<NumberOfContours.
 */
inline void vtkContourGrid::SetValue(int i, double value)
{this->ContourValues->SetValue(i,value);}

/**
 * Get the ith contour value.
 */
inline double vtkContourGrid::GetValue(int i)
{return this->ContourValues->GetValue(i);}

/**
 * Get a pointer to an array of contour values. There will be
 * GetNumberOfContours() values in the list.
 */
inline double *vtkContourGrid::GetValues()
{return this->ContourValues->GetValues();}

/**
 * Fill a supplied list with contour values. There will be
 * GetNumberOfContours() values in the list. Make sure you allocate
 * enough memory to hold the list.
 */
inline void vtkContourGrid::GetValues(double *contourValues)
{this->ContourValues->GetValues(contourValues);}

/**
 * Set the number of contours to place into the list. You only really
 * need to use this method to reduce list size. The method SetValue()
 * will automatically increase list size as needed.
 */
inline void vtkContourGrid::SetNumberOfContours(int number)
{this->ContourValues->SetNumberOfContours(number);}

/**
 * Get the number of contours in the list of contour values.
 */
inline int vtkContourGrid::GetNumberOfContours()
{return this->ContourValues->GetNumberOfContours();}

/**
 * Generate numContours equally spaced contour values between specified
 * range. Contour values will include min/max range values.
 */
inline void vtkContourGrid::GenerateValues(int numContours, double range[2])
{this->ContourValues->GenerateValues(numContours, range);}

/**
 * Generate numContours equally spaced contour values between specified
 * range. Contour values will include min/max range values.
 */
inline void vtkContourGrid::GenerateValues(int numContours, double
                                             rangeStart, double rangeEnd)
{this->ContourValues->GenerateValues(numContours, rangeStart, rangeEnd);}


#endif


