text: /*=========================================================================
  
    Program:   Visualization Toolkit
    Module:    vtkGeoSampleArcs.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.
  
  =========================================================================*/
  /*-------------------------------------------------------------------------
    Copyright 2008 Sandia Corporation.
    Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
    the U.S. Government retains certain rights in this software.
  -------------------------------------------------------------------------*/
  /**
   * @class   vtkGeoSampleArcs
   * @brief   Samples geospatial lines at regular intervals.
   *
   *
   * vtkGeoSampleArcs refines lines in the input polygonal data
   * so that the distance between adjacent points is no more than a threshold
   * distance. Points are interpolated along the surface of the globe.
   * This is useful in order to keep lines such as political boundaries from
   * intersecting the globe and becoming invisible.
  */
  
  #ifndef vtkGeoSampleArcs_h
  #define vtkGeoSampleArcs_h
  
  #include "vtkGeovisCoreModule.h" // For export macro
  #include "vtkPolyDataAlgorithm.h"
  
  class VTKGEOVISCORE_EXPORT vtkGeoSampleArcs : public vtkPolyDataAlgorithm
  {
  public:
    static vtkGeoSampleArcs *New();
  
    vtkTypeMacro(vtkGeoSampleArcs,vtkPolyDataAlgorithm);
    void PrintSelf(ostream& os, vtkIndent indent) override;
  
    //@{
    /**
     * The base radius used to determine the earth's surface.
     * Default is the earth's radius in meters.
     * TODO: Change this to take in a vtkGeoTerrain to get altitude.
     */
    vtkSetMacro(GlobeRadius, double);
    vtkGetMacro(GlobeRadius, double);
    //@}
  
    //@{
    /**
     * The maximum distance, in meters, between adjacent points.
     */
    vtkSetMacro(MaximumDistanceMeters, double);
    vtkGetMacro(MaximumDistanceMeters, double);
    //@}
  
    enum
    {
      RECTANGULAR,
      SPHERICAL
    };
  
    //@{
    /**
     * The input coordinate system.
     * RECTANGULAR is x,y,z meters relative the the earth center.
     * SPHERICAL is longitude,latitude,altitude.
     */
    vtkSetMacro(InputCoordinateSystem, int);
    vtkGetMacro(InputCoordinateSystem, int);
    virtual void SetInputCoordinateSystemToRectangular()
      { this->SetInputCoordinateSystem(RECTANGULAR); }
    virtual void SetInputCoordinateSystemToSpherical()
      { this->SetInputCoordinateSystem(SPHERICAL); }
    //@}
  
    //@{
    /**
     * The desired output coordinate system.
     * RECTANGULAR is x,y,z meters relative the the earth center.
     * SPHERICAL is longitude,latitude,altitude.
     */
    vtkSetMacro(OutputCoordinateSystem, int);
    vtkGetMacro(OutputCoordinateSystem, int);
    virtual void SetOutputCoordinateSystemToRectangular()
      { this->SetOutputCoordinateSystem(RECTANGULAR); }
    virtual void SetOutputCoordinateSystemToSpherical()
      { this->SetOutputCoordinateSystem(SPHERICAL); }
    //@}
  
  protected:
    vtkGeoSampleArcs();
    ~vtkGeoSampleArcs() override;
  
    /**
     * Convert the vtkGraph into vtkPolyData.
     */
    int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *) override;
  
    double GlobeRadius;
    double MaximumDistanceMeters;
    int InputCoordinateSystem;
    int OutputCoordinateSystem;
  
  private:
    vtkGeoSampleArcs(const vtkGeoSampleArcs&) = delete;
    void operator=(const vtkGeoSampleArcs&) = delete;
  };
  
  #endif
  