Add a midpoint Metapost macro.

diff --git a/Utils/Metapost.tex b/Utils/Metapost.tex
index 7caa6e0275c53ab2d20413697e18e8c42151fd65..e0177804afb2b8a55881c29be0151545fc80cf58 100644 (file)
--- a/Utils/Metapost.tex
+++ b/Utils/Metapost.tex
@@ -94,6 +94,8 @@ define_global_boolean_option("labels");
 setObjectDefaultOption("Reg")("reflect")(false);
 setObjectDefaultOption("Reg")("labels")(false);
 
+def midpoint(expr a, b) = ((a + b) / 2) enddef;
+
 \stopMPinclusions
 
 % Make \overrightarrow "unexpanded", to make it work within metapost.