LocalConversion.h

//
// LocalConversion.h
//
// This library has a concept of current conversion from earth to world
// coordinates which is represented by the vtLocalConversion class.
//
// Copyright (c) 2001-2009 Virtual Terrain Project
// Free for all uses, see license.txt for details.
//

#ifndef VTLIB_LOCALCONVERSIONH
#define VTLIB_LOCALCONVERSIONH

// global conversion factor
#define WORLD_SCALE             1.0f    // 1 meter = 1.0 units

#include "Projections.h"        // for LinearUnits

class vtLocalConversion
{
public:
    vtLocalConversion();

    void Setup(LinearUnits units, const DRECT &earthextents);
    void SetOrigin(const DPoint2 &origin);

    void convert_earth_to_local_xz(double ex, double ey, float &x, float &z) const;
    void convert_local_xz_to_earth(float x, float z, double &ex, double &ey) const;

    void ConvertToEarth(const FPoint3 &world, DPoint3 &earth) const;
    void ConvertToEarth(float x, float z, DPoint2 &earth) const;

    void ConvertFromEarth(const DPoint2 &earth, float &x, float &z) const;
    void ConvertFromEarth(const DPoint3 &earth, FPoint3 &world) const;
    void ConvertFromEarth(const DRECT &earth, FRECT &world) const;

    void ConvertVectorToEarth(float x, float z, DPoint2 &earth) const;
    void ConvertVectorFromEarth(const DPoint2 &earth, float &x, float &z) const;

    LinearUnits GetUnits() const { return m_units; }

protected:
    LinearUnits m_units;
    DPoint2 m_EarthOrigin;
    DPoint2 m_scale;
};

extern vtLocalConversion g_Conv;

#endif // VTLIB_LOCALCONVERSIONH