X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fmathconstants.h;h=92afde1c147ad779de5a883ff475eaea5fadda7f;hb=cb6b66411cf6a34f7b24b199502958bb12960a0f;hp=78d7d7021f928257ec472db39b8677634d4bc00f;hpb=043ecf4d074909ba2f7f53237962f9eaa72f19c2;p=architektonas

diff --git a/src/mathconstants.h b/src/mathconstants.h
index 78d7d70..92afde1 100644
--- a/src/mathconstants.h
+++ b/src/mathconstants.h
@@ -1,7 +1,8 @@
+//
 // 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
@@ -10,10 +11,21 @@
 // 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 (Pi is wrong)
 //
 
-#define PI 3.14159265358979323846264338327
-#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)
+
+#define EPSILON            1e-6