From 48f6255fbc42c5693ab88b575e33011dff52b8bb Mon Sep 17 00:00:00 2001
From: c9s <yoanlin93@gmail.com>
Date: Sun, 18 May 2014 08:19:32 +0800
Subject: [PATCH] document graphviz feature

---
 README.md | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/README.md b/README.md
index d23f782..9053db8 100644
--- a/README.md
+++ b/README.md
@@ -86,6 +86,28 @@ end
 ```
 
 
+Rendering routes with graphviz
+-------------------------------
+
+The `test_gvc_render_file` API let you render the whole route trie into a image.
+
+[Imgur](http://i.imgur.com/J2LdzeK.png)
+
+Or you can even export it with dot format:
+
+```dot
+digraph g {
+	graph [bb="0,0,205.1,471"];
+	node [label="\N"];
+	"{root}"	 [height=0.5,
+		pos="35.097,453",
+		width=0.97491];
+	"#1"	 [height=0.5,
+		pos="35.097,366",
+		width=0.75];
+        ....
+```
+
 Use case in PHP
 -----------------------