210e87ec3a
Dave Eberly's spherical interpolation code (found in the Lib/Math directory). So it would be great if you could give him also a place in the thanks file. Changing the WeatherDatabse made actually a heavy internal redesign necessary but no code outside the database is affected (isn't code hiding great?).
125 lines
4.4 KiB
C++
125 lines
4.4 KiB
C++
/*****************************************************************************
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Header: FGAirPressureItem.h
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Author: Christian Mayer
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Date started: 28.05.99
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-------- Copyright (C) 1999 Christian Mayer (fgfs@christianmayer.de) --------
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place - Suite 330, Boston, MA 02111-1307, USA.
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Further information about the GNU General Public License can also be found on
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the world wide web at http://www.gnu.org.
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FUNCTIONAL DESCRIPTION
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------------------------------------------------------------------------------
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Air pressure item that is stored in the micro weather class
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HISTORY
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------------------------------------------------------------------------------
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28.05.1999 Christian Mayer Created
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08.06.1999 Christian Mayer Added international air preasure formula
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16.06.1999 Durk Talsma Portability for Linux
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20.06.1999 Christian Mayer added lots of consts
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11.10.1999 Christian Mayer changed set<> to map<> on Bernie Bright's
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suggestion
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19.10.1999 Christian Mayer change to use PLIB's sg instead of Point[2/3]D
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and lots of wee code cleaning
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15.12.1999 Christian Mayer changed the air pressure calculation to a much
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more realistic formula. But as I need for that
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the temperature I moved the code to
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FGPhysicalProperties
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*****************************************************************************/
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/****************************************************************************/
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/* SENTRY */
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/****************************************************************************/
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#ifndef FGAirPressureItem_H
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#define FGAirPressureItem_H
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/****************************************************************************/
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/* INCLUDES */
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/****************************************************************************/
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#include <math.h>
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#include "FGWeatherDefs.h"
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/****************************************************************************/
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/* DEFINES */
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/****************************************************************************/
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class FGAirPressureItem;
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FGAirPressureItem operator-(const FGAirPressureItem& arg);
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/****************************************************************************/
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/* CLASS DECLARATION */
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/* NOTE: The value stored in 'value' is the air preasure that we'd have at */
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/* an altitude of 0.0 The correct airpreasure at the stored altitude */
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/* gets calulated in FGPhyiscalProperties as I need to know the */
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/* temperatures at the different altitudes for that. */
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/****************************************************************************/
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class FGAirPressureItem
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{
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private:
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WeatherPrecision value; //that's the airpressure at 0 metres
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protected:
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public:
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FGAirPressureItem(const WeatherPrecision v) {value = v; }
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FGAirPressureItem() {value = FG_WEATHER_DEFAULT_AIRPRESSURE;}
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WeatherPrecision getValue(void) const
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{
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return value;
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};
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FGAirPressureItem& operator*=(const WeatherPrecision arg);
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FGAirPressureItem& operator+=(const FGAirPressureItem& arg);
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FGAirPressureItem& operator-=(const FGAirPressureItem& arg);
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friend FGAirPressureItem operator-(const FGAirPressureItem& arg);
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};
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inline FGAirPressureItem& FGAirPressureItem::operator*= (const WeatherPrecision arg)
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{
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value *= arg;
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return *this;
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}
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inline FGAirPressureItem& FGAirPressureItem::operator+= (const FGAirPressureItem& arg)
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{
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value += arg.value;
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return *this;
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}
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inline FGAirPressureItem& FGAirPressureItem::operator-= (const FGAirPressureItem& arg)
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{
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value -= arg.value;
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return *this;
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}
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inline FGAirPressureItem operator-(const FGAirPressureItem& arg)
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{
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return FGAirPressureItem(-arg.value);
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}
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/****************************************************************************/
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#endif /*FGAirPressureItem_H*/
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