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