// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-FileCopyrightText: Copyright 2008 Sandia Corporation
// SPDX-License-Identifier: LicenseRef-BSD-3-Clause-Sandia-USGov
/**
 * @class   vtkDistanceToCamera
 * @brief   calculates distance from points to the camera.
 *
 *
 * This filter adds a double array containing the distance from each point
 * to the camera. If Scaling is on, it will use the values in the input
 * array to process in order to scale the size of the points. ScreenSize
 * sets the size in screen pixels that you would want a rendered rectangle
 * at that point to be, if it was scaled by the output array.
 */

#ifndef vtkDistanceToCamera_h
#define vtkDistanceToCamera_h

#include "vtkPointSetAlgorithm.h"
#include "vtkRenderingCoreModule.h" // For export macro

VTK_ABI_NAMESPACE_BEGIN
class vtkRenderer;

class VTKRENDERINGCORE_EXPORT vtkDistanceToCamera : public vtkPointSetAlgorithm
{
public:
  static vtkDistanceToCamera* New();
  vtkTypeMacro(vtkDistanceToCamera, vtkPointSetAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  ///@{
  /**
   * The renderer which will ultimately render these points.
   */
  void SetRenderer(vtkRenderer* ren);
  vtkGetObjectMacro(Renderer, vtkRenderer);
  ///@}

  ///@{
  /**
   * The desired screen size obtained by scaling glyphs by the distance
   * array. It assumes the glyph at each point will be unit size.
   */
  vtkSetMacro(ScreenSize, double);
  vtkGetMacro(ScreenSize, double);
  ///@}

  ///@{
  /**
   * Whether to scale the distance by the input array to process.
   */
  vtkSetMacro(Scaling, bool);
  vtkGetMacro(Scaling, bool);
  vtkBooleanMacro(Scaling, bool);
  ///@}

  ///@{
  /**
   * The name of the distance array. If not set, the array is
   * named 'DistanceToCamera'.
   */
  vtkSetStringMacro(DistanceArrayName);
  vtkGetStringMacro(DistanceArrayName);
  ///@}

  /**
   * The modified time of this filter.
   */
  vtkMTimeType GetMTime() override;

protected:
  vtkDistanceToCamera();
  ~vtkDistanceToCamera() override;

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

  vtkRenderer* Renderer;
  double ScreenSize;
  bool Scaling;
  int LastRendererSize[2];
  double LastCameraPosition[3];
  double LastCameraFocalPoint[3];
  double LastCameraViewUp[3];
  double LastCameraParallelScale;
  char* DistanceArrayName;

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

VTK_ABI_NAMESPACE_END
#endif