removed M_PI warning

cmoad · cmoad · commit e42223e15565 · 2006-09-12T16:22:55.000Z
svn path=/trunk/matplotlib/; revision=2765
diff --git a/src/_backend_agg.cpp b/src/_backend_agg.cpp
@@ -38,9 +38,15 @@
 #endif
 #endif
 
+#ifndef M_PI
 #define M_PI       3.14159265358979323846
+#endif
+#ifndef M_PI_4
 #define M_PI_4     0.785398163397448309616
+#endif
+#ifndef M_PI_2
 #define M_PI_2     1.57079632679489661923
+#endif
 
 /* ------------ RendererAgg methods ------------- */
 
