Atmosphere.h

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/*
 * Atmosphere.h
 *
 * Part of Fly! Legacy project
 *
 * Copyright (c) 2004 Chris Wallace
 *
 * Fly! Legacy is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 * Fly! Legacy is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 *   along with Fly! Legacy; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef ATMOSPHERE_H_
#define ATMOSPHERE_H_

#include "FlyLegacy.h"


//
// CAtmosphereModel
//
// Abstract base class that all atmosphere model implementations must support
//
// 
//
class CAtmosphereModel {
public:
  // Constructors/destructor
  CAtmosphereModel (void);

  // CAtmosphereModel methods
  // Set baseline conditions
  virtual void  SetTemperatureC (float m_msl, float t) = 0;
  virtual void  SetPressureKgM2 (float m_msl, float p) = 0;

  // Get temperature at specified position in various units
  virtual float GetTemperatureC (float m_msl);
  virtual float GetTemperatureK (float m_msl);
  virtual float GetTemperatureF (float ft_msl);
  virtual float GetTemperatureR (float ft_msl);

  // Get dewpoint in various units
  virtual float GetDewpointC (float m_msl);
  virtual float GetDewpointK (float m_msl);
  virtual float GetDewpointF (float ft_msl);
  virtual float GetDewpointR (float ft_msl);

  // Get relative humidity in percentage
  virtual float GetRelativeHumidity (float m_msl);

  // Get atmospheric pressure in various units
  virtual float GetPressureKgM2 (float m_msl);
  virtual float GetPressureSlugsFt2 (float ft_msl);
  virtual float GetPressureInchesHg (float ft_msl); 

  // Get air pressure in various units
  virtual float GetDensityKgM3 (float m_msl);
  virtual float GetDensitySlugsFt3 (float ft_msl);

protected:
};


//
// CAtmosphereModelFly2
//
// This concrete CAtmosphereModel subclass implements the standard Fly! II
//   atmosphere model.  This is similar to the International Standard
//   Atmosphere with some important differences.  See Docs/Atmosphere.doc
//   for details.
//
class CAtmosphereModelFly2 {
public:
  // Constructors/destructor
  CAtmosphereModelFly2 (void);

  // CAtmosphereModel methods
  // Set baseline conditions
  void  SetTemperatureC (float m_msl, float t);
  void  SetPressureKgM2 (float m_msl, float p);

  // Get temperature at specified position in various units
  float GetTemperatureC (float m_msl);
  float GetTemperatureK (float m_msl);
  float GetTemperatureF (float ft_msl);
  float GetTemperatureR (float ft_msl);

  // Get dewpoint in various units
  float GetDewpointC (float m_msl);
  float GetDewpointK (float m_msl);
  float GetDewpointF (float ft_msl);
  float GetDewpointR (float ft_msl);

  // Get relative humidity in percentage
  // Fly! II uses a dry air model, no humidity
  float GetRelativeHumidity (float m_msl) { return 0.0f; };

  // Get atmospheric pressure in various units
  float GetPressureKgM2 (float m_msl);
  float GetPressureSlugsFt2 (float ft_msl);
  float GetPressureInchesHg (float ft_msl); 

  // Get air pressure in various units
  float GetDensityKgM3 (float m_msl);
  float GetDensitySlugsFt3 (float ft_msl);

protected:
  float   tempOffset;       // Sea Level temperature offset from +15 C (in deg C)
  float   pressureOffset;   // Sea Level pressure offset from 1.013E+5 Pa (in Pa)
};


#endif // ATMOSPHERE_H_

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