vtkCellGridToUnstructuredGrid.h

Go to the documentation of this file.

// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkCellGridToUnstructuredGrid_h
#define vtkCellGridToUnstructuredGrid_h
 
#include "vtkCellGrid.h"              // For subclass
#include "vtkCellType.h"              // For initializer
#include "vtkFiltersCellGridModule.h" // For export macro
#include "vtkNew.h"                   // For ivar
#include "vtkStringToken.h"           // For ivars
#include "vtkUnstructuredGridAlgorithm.h"
 
#include <unordered_map>
 
VTK_ABI_NAMESPACE_BEGIN
 
class vtkIncrementalOctreePointLocator;
 
class VTKFILTERSCELLGRID_EXPORT vtkCellGridToUnstructuredGrid : public vtkUnstructuredGridAlgorithm
{
public:
  class Query : public vtkCellGridQuery
  {
  public:
    static Query* New();
    vtkTypeMacro(vtkCellGridToUnstructuredGrid::Query, vtkCellGridQuery);
    void PrintSelf(ostream& os, vtkIndent indent) override;
 
    struct OutputAllocation
    {
      int CellType{ VTK_EMPTY_CELL };
      vtkIdType NumberOfCells{ 0 };
      vtkIdType NumberOfConnectivityEntries{ 0 };
      vtkIdType CellOffset{ 0 };
      vtkIdType ConnOffset{ 0 };
    };
 
    using OutputAllocations = std::unordered_map<vtkStringToken, OutputAllocation>;
 
    enum PassType : int
    {
      CountOutputs = 0, 
      GenerateConnectivity =
        1, 
      GeneratePointData = 2 
    };
 
    bool Initialize() override;
    void StartPass() override;
    bool Finalize() override;
 
    bool IsAnotherPassRequired() override { return this->Pass < PassType::GeneratePointData; }
 
    vtkUnstructuredGrid* GetOutput() const { return this->Output; }
    vtkCellGrid* GetInput() const { return this->Input; }
 
    OutputAllocations& GetOutputAllocations() { return this->OutputOffsets; }
    const OutputAllocations& GetOutputAllocations() const { return this->OutputOffsets; }
 
    vtkDataArray* GetOutputArray(vtkCellAttribute* inputAttribute);
 
    vtkIncrementalOctreePointLocator* GetLocator() { return this->Locator.GetPointer(); }
 
    using ConnectivityTransformType = std::unordered_map<vtkIdType, vtkIdType>;
    ConnectivityTransformType& GetConnectivityTransform(vtkStringToken cellType)
    {
      return this->ConnectivityTransforms[cellType];
    }
 
    using ConnectivityCountType = std::map<vtkIdType, int>;
    ConnectivityCountType& GetConnectivityCount() { return this->ConnectivityCount; }
 
    using ConnectivityWeightType = std::vector<float>;
    ConnectivityWeightType& GetConnectivityWeights() { return this->ConnectivityWeights; }
 
  protected:
    friend class vtkCellGridToUnstructuredGrid;
    Query() = default;
    ~Query() override = default;
 
    vtkCellGrid* Input{ nullptr };
    vtkUnstructuredGrid* Output{ nullptr };
 
    OutputAllocations OutputOffsets;
    // Map input to output attributes:
    std::unordered_map<vtkCellAttribute*, vtkDataArray*> AttributeMap;
    vtkNew<vtkIncrementalOctreePointLocator> Locator;
    std::unordered_map<vtkStringToken, ConnectivityTransformType> ConnectivityTransforms;
    ConnectivityCountType ConnectivityCount;
    ConnectivityWeightType ConnectivityWeights;
 
  private:
    Query(const Query&) = delete;
    void operator=(const Query&) = delete;
  };
 
  static vtkCellGridToUnstructuredGrid* New();
  vtkTypeMacro(vtkCellGridToUnstructuredGrid, vtkUnstructuredGridAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
protected:
  vtkCellGridToUnstructuredGrid() = default;
  ~vtkCellGridToUnstructuredGrid() override = default;
 
  int FillInputPortInformation(int port, vtkInformation* info) override;
  int RequestData(
    vtkInformation* request, vtkInformationVector** inInfo, vtkInformationVector* ouInfo) override;
 
  vtkNew<Query> Request;
 
private:
  vtkCellGridToUnstructuredGrid(const vtkCellGridToUnstructuredGrid&) = delete;
  void operator=(const vtkCellGridToUnstructuredGrid&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif // vtkCellGridToUnstructuredGrid_h