From: Costa Shulyupin <constantine.shulyupin@gmail.com>
Date: Tue, 24 May 2022 19:16:39 +0000 (+0300)
Subject: comment about theory and origins of trapezoid.c
X-Git-Tag: 4.0.0~2^2~1
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=96e240393eb627899e4d2b10155663e03405d6ba;p=graphviz

comment about theory and origins of trapezoid.c
---

diff --git a/lib/ortho/trapezoid.c b/lib/ortho/trapezoid.c
index 21638dce6..31c19f022 100644
--- a/lib/ortho/trapezoid.c
+++ b/lib/ortho/trapezoid.c
@@ -1,3 +1,11 @@
+/**
+ * @file
+ * @brief trapezoidation
+ *
+ * See [Fast polygon triangulation based on Seidel's algorithm](http://gamma.cs.unc.edu/SEIDEL/)
+ *
+ */
+
 /*************************************************************************
  * Copyright (c) 2011 AT&T Intellectual Property
  * All rights reserved. This program and the accompanying materials