X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fconstants.h;h=0356af7a473ba01adb0c9f1d7e5c918c1ea9032b;hb=95ddc04a734d56d917c94e4bc952e9ac78637ba6;hp=df0fc8baa3e2d74870ec68551b087322090633d5;hpb=733e6fa14ff507a1022ecab8d55cc9bf587bee40;p=simgear.git

diff --git a/simgear/constants.h b/simgear/constants.h
index df0fc8ba..0356af7a 100644
--- a/simgear/constants.h
+++ b/simgear/constants.h
@@ -34,15 +34,22 @@
 #include <cmath>
 
 
-#include <plib/sg.h>
+// Make sure PI is defined in its various forms
 
+#ifndef SGD_PI // remove me once FlightGear no longer uses PLIB
 
-// Make sure PI is defined in its various forms
+#ifdef M_PI
+const double SGD_PI = M_PI;
+const float SG_PI = M_PI;
+#else
+const float SG_PI = 3.1415926535f;
+const double SGD_PI = 3.1415926535;
+#endif
 
-// SG_PI and SGD_PI (float and double) come from plib/sg.h
+#endif // of PLIB-SG guard
 
 /** 2 * PI */
-#define SGD_2PI      6.28318530717958647692
+const double SGD_2PI = SGD_PI * 2.0;
 
 /** PI / 2 */
 #ifdef M_PI_2
@@ -52,7 +59,17 @@
 #endif
 
 /** PI / 4 */
-#define SGD_PI_4     0.78539816339744830961
+const double SGD_PI_4 = 0.78539816339744830961;
+
+#ifndef SGD_DEGREES_TO_RADIANS // // remove me once FlightGear no longer uses PLIB
+
+const double SGD_DEGREES_TO_RADIANS = SGD_PI / 180.0;
+const double SGD_RADIANS_TO_DEGREES = 180.0 / SGD_PI;
+
+const float SG_DEGREES_TO_RADIANS = SG_PI / 180.0f;
+const float SG_RADIANS_TO_DEGREES = 180.0f / SG_PI;
+
+#endif // of PLIB-SG guard
 
 /** \def SG_E "e" */
 #ifdef M_E
@@ -118,10 +135,10 @@
 /** Nautical Miles to Radians */
 #define SG_RAD_TO_NM        3437.7467707849392526
 
-/** Miles per second to Knots */
+/** meters per second to Knots */
 #define SG_MPS_TO_KT        1.9438444924406046432
 
-/** Knots to Miles per second */
+/** Knots to meters per second */
 #define SG_KT_TO_MPS        0.5144444444444444444
 
 /** Feet per second to Knots */
@@ -130,16 +147,16 @@
 /** Knots to Feet per second */
 #define SG_KT_TO_FPS        1.6878098571011956874
 
-/** Miles per second to Miles per hour */
+/** meters per second to Miles per hour */
 #define SG_MPS_TO_MPH       2.2369362920544020312
 
-/** Miles per hour to Miles per second */
+/** meetrs per hour to Miles per second */
 #define SG_MPH_TO_MPS       0.44704
 
 /** Meters per second to Kilometers per hour */
 #define SG_MPS_TO_KMH       3.6
 
-/** Kilometers per hour to Miles per second */
+/** Kilometers per hour to meters per second */
 #define SG_KMH_TO_MPS       0.2777777777777777778
 
 /** Pascal to Inch Mercury */