X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fmathconstants.h;fp=src%2Fmathconstants.h;h=b0e516e339fead7ffe6c0cffb80ce12fa7ea1768;hb=0bd89e9489fa52f92545a7e94c4a31e863a5f898;hp=42f4940343c5119aa97867f63e225e01f643657e;hpb=3fe885b75511c9fbfe18a5c509260e83bb7ac136;p=ttedit

diff --git a/src/mathconstants.h b/src/mathconstants.h
index 42f4940..b0e516e 100644
--- a/src/mathconstants.h
+++ b/src/mathconstants.h
@@ -1,7 +1,7 @@
 // Mathematical Constants used by Architektonas
 //
 // Part of the Architektonas Project
-// (C) 2011 Underground Software
+// (C) 2016 Underground Software
 // See the README and GPLv3 files for licensing and warranty information
 //
 // NOTE: Since this has no code associated with it, there is no corresponding
@@ -10,14 +10,20 @@
 // JLH = James Hammons <jlhamm@acm.org>
 //
 // WHO  WHEN        WHAT
-// ---  ----------  ------------------------------------------------------------
+// ---  ----------  -----------------------------------------------------------
 // JLH  04/01/2011  Created this file
+// JLH  03/15/2016  Added Tau constants, removed Pi constants
 //
 
-#define PI                 3.14159265358979323846264338327
-#define PI_OVER_2          (PI / 2.0)
-#define PI3_OVER_2         ((3.0 * PI) / 2.0)
-#define PI_TIMES_2         (PI * 2.0)
-#define RADIANS_TO_DEGREES (180.0 / PI)
-#define DEGREES_TO_RADIANS (PI / 180.0)
+#define TAU                6.28318530717958647692528676655
+#define TAU_1QTR           (TAU * 0.25)
+#define TAU_2QTR           (TAU * 0.50)
+#define TAU_3QTR           (TAU * 0.75)
+#define RADIANS_TO_DEGREES (360.0 / TAU)
+#define DEGREES_TO_RADIANS (TAU / 360.0)
+
+// Convenience definitions
+#define HALF_TAU           (TAU_2QTR)
+#define QTR_TAU            (TAU_1QTR)
+#define THREE_QTR_TAU      (TAU_3QTR)