52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
|
#ifndef _FG_ATC_PROJECTION_HXX
|
||
|
|
#define _FG_ATC_PROJECTION_HXX
|
||
|
|
|
||
|
|
#include <simgear/math/point3d.hxx>
|
||
|
|
|
||
|
|
// FGATCProjection - a class to project an area local to an airport onto an orthogonal co-ordinate system
|
||
|
|
class FGATCProjection {
|
||
|
|
|
||
|
|
public:
|
||
|
|
FGATCProjection();
|
||
|
|
~FGATCProjection();
|
||
|
|
|
||
|
|
void Init(Point3D centre);
|
||
|
|
|
||
|
|
// Convert a lat/lon co-ordinate to the local projection
|
||
|
|
Point3D ConvertToLocal(Point3D pt);
|
||
|
|
|
||
|
|
// Convert a local projection co-ordinate to lat/lon
|
||
|
|
Point3D ConvertFromLocal(Point3D pt);
|
||
|
|
|
||
|
|
private:
|
||
|
|
Point3D origin; // lat/lon of local area origin
|
||
|
|
double correction_factor; // Reduction in surface distance per degree of longitude due to latitude. Saves having to do a cos() every call.
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
// FGATCAlignedProjection - a class to project an area local to a runway onto an orthogonal co-ordinate system
|
||
|
|
// with the origin at the threshold and the runway aligned with the y axis.
|
||
|
|
class FGATCAlignedProjection {
|
||
|
|
|
||
|
|
public:
|
||
|
|
FGATCAlignedProjection();
|
||
|
|
~FGATCAlignedProjection();
|
||
|
|
|
||
|
|
void Init(Point3D centre, double heading);
|
||
|
|
|
||
|
|
// Convert a lat/lon co-ordinate to the local projection
|
||
|
|
Point3D ConvertToLocal(Point3D pt);
|
||
|
|
|
||
|
|
// Convert a local projection co-ordinate to lat/lon
|
||
|
|
Point3D ConvertFromLocal(Point3D pt);
|
||
|
|
|
||
|
|
private:
|
||
|
|
Point3D origin; // lat/lon of local area origin (the threshold)
|
||
|
|
double theta; // the rotation angle for alignment in radians
|
||
|
|
double correction_factor; // Reduction in surface distance per degree of longitude due to latitude. Saves having to do a cos() every call.
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // _FG_ATC_PROJECTION_HXX
|