// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
 * @class   vtkVectorDot
 * @brief   generate scalars from dot product of vectors and normals (e.g., show displacement plot)
 *
 * vtkVectorDot is a filter to generate point scalar values from a dataset.
 * The scalar value at a point is created by computing the dot product
 * between the normal and vector at each point. Combined with the appropriate
 * color map, this can show nodal lines/mode shapes of vibration, or a
 * displacement plot.
 *
 * Note that by default the resulting scalars are mapped into a specified
 * range. This requires an extra pass in the algorithm. This mapping pass can
 * be disabled (set MapScalars to off).
 *
 * @warning
 * This class has been threaded with vtkSMPTools. Using TBB or other
 * non-sequential type (set in the CMake variable
 * VTK_SMP_IMPLEMENTATION_TYPE) may improve performance significantly.
 */

#ifndef vtkVectorDot_h
#define vtkVectorDot_h

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

VTK_ABI_NAMESPACE_BEGIN
class VTKFILTERSCORE_EXPORT vtkVectorDot : public vtkDataSetAlgorithm
{
public:
  vtkTypeMacro(vtkVectorDot, vtkDataSetAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  /**
   * Construct object with scalar range (-1,1).
   */
  static vtkVectorDot* New();

  ///@{
  /**
   * Enable/disable the mapping of scalars into a specified range. This will
   * significantly improve the performance of the algorithm but the resulting
   * scalar values will strictly be a function of the vector and normal
   * data. By default, MapScalars is enabled, and the output scalar
   * values will fall into the range ScalarRange.
   */
  vtkSetMacro(MapScalars, vtkTypeBool);
  vtkGetMacro(MapScalars, vtkTypeBool);
  vtkBooleanMacro(MapScalars, vtkTypeBool);
  ///@}

  ///@{
  /**
   * Specify the range into which to map the scalars. This mapping only
   * occurs if MapScalars is enabled.
   */
  vtkSetVector2Macro(ScalarRange, double);
  vtkGetVectorMacro(ScalarRange, double, 2);
  ///@}

  ///@{
  /**
   * Return the actual range of the generated scalars (prior to mapping).
   * Note that the data is valid only after the filter executes.
   */
  vtkGetVectorMacro(ActualRange, double, 2);
  ///@}

protected:
  vtkVectorDot();
  ~vtkVectorDot() override = default;

  vtkTypeBool MapScalars;
  double ScalarRange[2];
  double ActualRange[2];

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

private:
  vtkVectorDot(const vtkVectorDot&) = delete;
  void operator=(const vtkVectorDot&) = delete;
};

VTK_ABI_NAMESPACE_END
#endif