Erik Hofman:

[flightgear.git] / src / WeatherCM / FGAirPressureItem.h

diff --git a/src/WeatherCM/FGAirPressureItem.h b/src/WeatherCM/FGAirPressureItem.h
index 3b4d422f096bb6b5e9dabb04b31f7640ab3286be..21192904b71b5949905a0e02681e3ce76869caaa 100644 (file)
--- a/src/WeatherCM/FGAirPressureItem.h
+++ b/src/WeatherCM/FGAirPressureItem.h
@@ -37,6 +37,10 @@ HISTORY
                                suggestion
 19.10.1999 Christian Mayer     change to use PLIB's sg instead of Point[2/3]D
                                and lots of wee code cleaning
+15.12.1999 Christian Mayer     changed the air pressure calculation to a much
+                               more realistic formula. But as I need for that
+                               the temperature I moved the code to 
+                               FGPhysicalProperties
 *****************************************************************************/
 
 /****************************************************************************/
@@ -62,27 +66,30 @@ FGAirPressureItem operator-(const FGAirPressureItem& arg);
 /* CLASS DECLARATION                                                       */
 /* NOTE: The value stored in 'value' is the air preasure that we'd have at  */
 /*       an altitude of 0.0 The correct airpreasure at the stored altitude  */
-/*       gets calulated when getValue() is called.                         */
+/*       gets  calulated in  FGPhyiscalProperties  as  I need  to know  the */
+/*       temperatures at the different altitudes for that.                 */
 /****************************************************************************/
 class FGAirPressureItem
 {
 private:
-    WeatherPrecision value;
+    WeatherPrecision value; //that's the airpressure at 0 metres
 
 protected:
 public:
 
-    FGAirPressureItem(const WeatherPrecision v)        {value = v;}
+    FGAirPressureItem(const WeatherPrecision v)        {value = v;                             }
     FGAirPressureItem()                                {value = FG_WEATHER_DEFAULT_AIRPRESSURE;}
 
-    WeatherPrecision getValue(const WeatherPrecision& alt) const
+    WeatherPrecision getValue() const
     { 
-       return (WeatherPrecision)((value / 101325.0) *
-           (
-           1.01325e5 + alt * (-1.19459535223623e1 + alt * (5.50461110007561e-4 + alt * (-1.13574703113648e-8 + alt * 8.61601726143988e-14)))
-           ));
+       return value;
     };
-   
+
+    void setValue(WeatherPrecision p) 
+    { 
+       value = p;
+    };
+
     FGAirPressureItem& operator*=(const WeatherPrecision   arg);
     FGAirPressureItem& operator+=(const FGAirPressureItem& arg);
     FGAirPressureItem& operator-=(const FGAirPressureItem& arg);