Add another subsystem group.

[simgear.git] / simgear / constants.h

diff --git a/simgear/constants.h b/simgear/constants.h
index 8438e1321f08ff6d8af22886024dd21717f146f8..0356af7a473ba01adb0c9f1d7e5c918c1ea9032b 100644 (file)
--- 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