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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkCellAttributeCalculator
* @brief Perform a per-cell calculation on a vtkCellAttribute.
*
* This empty class serves as a common base class for calculators that
* compute quantities based on cell-attribute data.
*
* Examples of calculators include
* + computing interpolated values;
* + computing spatial derivatives (such as the Jacobian or Hessian matrices); or
* + computing integrals over an entire cell.
*
* Each type of calculator provides its own abstract subclass with virtual methods
* and then per-cell-type, per-attribute-type concrete implementations.
*
* @sa vtkCellGridAttribute
*/
#ifndef vtkCellAttributeCalculator_h
#define vtkCellAttributeCalculator_h
#include "vtkCommonDataModelModule.h" // for export
#include "vtkObject.h"
#include "vtkSmartPointer.h" // for API.
#include <unordered_map>
VTK_ABI_NAMESPACE_BEGIN
class vtkCellGrid;
class vtkCellMetadata;
class vtkCellAttribute;
class VTKCOMMONDATAMODEL_EXPORT vtkCellAttributeCalculator : public vtkObject
{
public:
vtkTypeMacro(vtkCellAttributeCalculator, vtkObject);
static vtkCellAttributeCalculator* New();
void PrintSelf(ostream& os, vtkIndent indent) override;
/// Return an instance of a calculator ready to work on \a cell and \a field.
template <typename CalculatorType>
vtkSmartPointer<CalculatorType> Prepare(vtkCellMetadata* cell, vtkCellAttribute* field)
{
auto result = this->PrepareForGrid(cell, field);
return CalculatorType::SafeDownCast(result);
}
/// Subclasses should override this to create an instance of their class with member
/// variables set to perform calculations on the given cell type and field.
virtual vtkSmartPointer<vtkCellAttributeCalculator> PrepareForGrid(
vtkCellMetadata* vtkNotUsed(cell), vtkCellAttribute* vtkNotUsed(field))
{
return nullptr;
}
protected:
vtkCellAttributeCalculator() = default;
~vtkCellAttributeCalculator() override = default;
private:
vtkCellAttributeCalculator(const vtkCellAttributeCalculator&) = delete;
void operator=(const vtkCellAttributeCalculator&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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