From: ellson <devnull@localhost>
Date: Tue, 18 Oct 2005 18:59:11 +0000 (+0000)
Subject: add comment about why wrong initializations is OK
X-Git-Tag: LAST_LIBGRAPH~32^2~7191
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=533fa1def82c8e4bb1f003225521f4b02575231b;p=graphviz

add comment about why wrong initializations is OK
---

diff --git a/lib/common/geom.c b/lib/common/geom.c
index e39cf6f33..91d5d04fb 100644
--- a/lib/common/geom.c
+++ b/lib/common/geom.c
@@ -355,6 +355,8 @@ static pointf rotatepf(pointf p, int cwrot)
     static int last_cwrot;
     pointf P;
 
+    /* cosa is initially wrong for a cwrot of 0
+     * this caching only works because we are never called for 0 rotations */
     if (cwrot != last_cwrot) {
 	sincos(cwrot / (2 * M_PI), &sina, &cosa);
 	last_cwrot = cwrot;