From: erg <devnull@localhost>
Date: Thu, 11 Jun 2009 15:54:54 +0000 (+0000)
Subject: Re-inforce need to zero out g->u
X-Git-Tag: LAST_LIBGRAPH~32^2~1928
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=165be8bf12cddbf073f03413dbad0b3967e8e018;p=graphviz

Re-inforce need to zero out g->u
---

diff --git a/doc/addingLayout.txt b/doc/addingLayout.txt
index cd0455891..103078589 100644
--- a/doc/addingLayout.txt
+++ b/doc/addingLayout.txt
@@ -155,10 +155,13 @@ semantics of these are described below.
   each node and edge. This cleans up splines labels, ND_pos, shapes
   and 0's out the A*info_t, so these have to occur last, but could be
   part of explicit xxx_cleanup_node and xxx_cleanup_edge, if desired.
-    At the end, we usually include
+    At the end, you should do
 
   if (g != g->root) memset(&(g->u), 0, sizeof(Agraphinfo_t));
 
+  This is necessary for the graph to be laid out again, as the layout
+  code assumes this structure is clean.
+
   libgvc does a final cleanup to the root graph, freeing any drawing,
   freeing its label, and zeroing out Agraphinfo_t of the root graph.