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

  Program:   ParaView
  Module:    vtkCustomUnstructuredGridBuilder.h

  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.paraview.org/HTML/Copyright.html 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   vtkCustomUnstructuredGridBuilder
 * @brief   Class for creating unstructured grids.
 *
 * Class for creating vtkUnstructuredGrids for a test driver.  The
 * UnstructuredGrid is built directly from a vtkUniformGrid to demonstrate
 * how to input a grid into the coprocessor.
*/

#ifndef vtkCustomUnstructuredGridBuilder_h
#define vtkCustomUnstructuredGridBuilder_h

#include "vtkCPUnstructuredGridBuilder.h"

class vtkDataObject;
class vtkGenericCell;
class vtkIdList;
class vtkPoints;
class vtkUnstructuredGrid;

class VTK_EXPORT vtkCustomUnstructuredGridBuilder : public vtkCPUnstructuredGridBuilder
{
public:
  static vtkCustomUnstructuredGridBuilder* New();
  vtkTypeMacro(vtkCustomUnstructuredGridBuilder, vtkCPUnstructuredGridBuilder);
  void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;

  /**
   * Return a grid.  BuiltNewGrid is set to 0 if the grids
   * that were returned were already built before.
   * vtkCustomUnstructuredGridBuilder will also delete the grid.
   */
  virtual vtkDataObject* GetGrid(
    unsigned long timeStep, double time, int& builtNewGrid) VTK_OVERRIDE;

  /**
   * Customized function to build UnstructuredGrid.
   */
  void BuildGrid();

protected:
  vtkCustomUnstructuredGridBuilder();
  ~vtkCustomUnstructuredGridBuilder();

  /**
   * Method to compute the centroid of Cell and return the values in xyz.
   */
  void ComputeCellCentroid(vtkGenericCell* cell, double xyz[3]);

private:
  vtkCustomUnstructuredGridBuilder(const vtkCustomUnstructuredGridBuilder&) = delete;
  void operator=(const vtkCustomUnstructuredGridBuilder&) = delete;
};
#endif
