vtkProjectedTerrainPath.h

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

  Program:   Visualization Toolkit
  Module:    vtkProjectedTerrainPath.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm 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.

=========================================================================*/
#ifndef vtkProjectedTerrainPath_h
#define vtkProjectedTerrainPath_h

#include "vtkFiltersHybridModule.h" // For export macro
#include "vtkPolyDataAlgorithm.h"

class vtkPriorityQueue;
class vtkImageData;
class vtkEdgeList;
class vtkPoints;

class VTKFILTERSHYBRID_EXPORT vtkProjectedTerrainPath : public vtkPolyDataAlgorithm
{
public:

  vtkTypeMacro(vtkProjectedTerrainPath,vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  static vtkProjectedTerrainPath* New();


  void SetSourceData(vtkImageData *source);
  vtkImageData *GetSource();

  void SetSourceConnection(vtkAlgorithmOutput* algOutput);

  enum {SIMPLE_PROJECTION=0,NONOCCLUDED_PROJECTION,HUG_PROJECTION};


  vtkSetClampMacro(ProjectionMode,int,SIMPLE_PROJECTION,HUG_PROJECTION);
  vtkGetMacro(ProjectionMode,int);
  void SetProjectionModeToSimple()
    {this->SetProjectionMode(SIMPLE_PROJECTION);}
  void SetProjectionModeToNonOccluded()
    {this->SetProjectionMode(NONOCCLUDED_PROJECTION);}
  void SetProjectionModeToHug()
    {this->SetProjectionMode(HUG_PROJECTION);}


  vtkSetMacro(HeightOffset,double);
  vtkGetMacro(HeightOffset,double);


  vtkSetClampMacro(HeightTolerance,double,0.0,VTK_FLOAT_MAX);
  vtkGetMacro(HeightTolerance,double);


  vtkSetClampMacro(MaximumNumberOfLines,vtkIdType,1,VTK_ID_MAX);
  vtkGetMacro(MaximumNumberOfLines,vtkIdType);

protected:
  vtkProjectedTerrainPath();
  ~vtkProjectedTerrainPath() override;

  int RequestData(vtkInformation *, vtkInformationVector **,
                          vtkInformationVector *) override;
  int FillInputPortInformation(int port, vtkInformation *info) override;

  // Supporting methods
  void GetImageIndex(double x[3], double loc[2], int ij[2]);
  double GetHeight(double loc[2], int ij[2]);
  void ComputeError(vtkIdType edgeId);
  void RemoveOcclusions();
  void HugTerrain();
  void SplitEdge(vtkIdType eId, double t);

  //ivars that the API addresses
  int       ProjectionMode;
  double    HeightOffset;
  double    HeightTolerance;
  vtkIdType MaximumNumberOfLines;

  //Bookkeeping arrays
  int          Dimensions[3];
  int          Extent[6];
  double       Origin[3];
  double       Spacing[3];
  vtkDataArray *Heights;
  vtkPoints    *Points;
  vtkIdType    NumLines;

  //Errors above/below terrain. In both instances, negative values are
  //inserted because the priority queue puts smallest values on top.
  vtkPriorityQueue *PositiveLineError; //errors above terrain
  vtkPriorityQueue *NegativeLineError; //errors below terrain

  //This is a PIMPL'd vector representing edges
  vtkEdgeList *EdgeList;

private:
  vtkProjectedTerrainPath(const vtkProjectedTerrainPath&) = delete;
  void operator=(const vtkProjectedTerrainPath&) = delete;

};

#endif