vtkGeoCamera.h

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

  Program:   Visualization Toolkit
  Module:    vtkGeoCamera.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.
-------------------------------------------------------------------------*/
#ifndef vtkGeoCamera_h
#define vtkGeoCamera_h

#include "vtkGeovisCoreModule.h" // For export macro
#include "vtkObject.h"
#include "vtkSmartPointer.h" // for SP

class vtkCamera;
class vtkGeoTerrainNode;
class vtkTransform;

class VTKGEOVISCORE_EXPORT vtkGeoCamera : public vtkObject
{
public:
  static vtkGeoCamera *New();
  vtkTypeMacro(vtkGeoCamera, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);


  vtkGetVector3Macro(Position, double);


  void SetLongitude(double longitude);
  vtkGetMacro(Longitude,double);


  void SetLatitude(double latitude);
  vtkGetMacro(Latitude,double);


  void SetDistance(double Distance);
  vtkGetMacro(Distance,double);


  void SetHeading(double heading);
  vtkGetMacro(Heading,double);


  void SetTilt(double tilt);
  vtkGetMacro(Tilt,double);

  vtkCamera* GetVTKCamera();

  void InitializeNodeAnalysis(int rendererSize[2]);

  double GetNodeCoverage(vtkGeoTerrainNode* node);


  vtkGetMacro(LockHeading, bool);
  vtkSetMacro(LockHeading, bool);
  vtkBooleanMacro(LockHeading, bool);


  void SetOriginLatitude(double oLat);
  vtkGetMacro(OriginLatitude, double);
  void SetOriginLongitude(double oLat);
  vtkGetMacro(OriginLongitude, double);


  vtkGetVector3Macro(Origin, double);
  void SetOrigin( double ox, double oy, double oz ) {
    this->Origin[0] = ox; this->Origin[1] = oy; this->Origin[2] = oz;
    this->UpdateVTKCamera();
  }

protected:
  vtkGeoCamera();
  ~vtkGeoCamera();

  void UpdateVTKCamera();
  void UpdateAngleRanges();

  vtkSmartPointer<vtkCamera> VTKCamera;
  vtkSmartPointer<vtkTransform> Transform;

  // This point is shifted to 0,0,0 to avoid openGL issues.
  double OriginLatitude;
  double OriginLongitude;
  double Origin[3];
  void ComputeRectilinearOrigin();

  double Longitude;
  double Latitude;
  double Distance;
  double Heading;
  double Tilt;
  bool   LockHeading;

  // Values precomputed to make updating terrain mode efficient.
  // The vislibility of many terrain nodes is analyzed every render.
  double ForwardNormal[3];
  double RightNormal[3];
  double UpNormal[3];
  double Aspect[2];

  // Frustum planes is better than other options for culling spheres.
  double LeftPlaneNormal[3];
  double RightPlaneNormal[3];
  double DownPlaneNormal[3];
  double UpPlaneNormal[3];

  double Position[3];

private:
  vtkGeoCamera(const vtkGeoCamera&) VTK_DELETE_FUNCTION;
  void operator=(const vtkGeoCamera&) VTK_DELETE_FUNCTION;
};

#endif