GraphViz Orthogonal edges
This example is adapted from an example posted by Ryan Schmidt to the graphviz-interest mailing list. Graphviz currently does not support orthogonal edges. However, with dot2tex you can use the topath attribute to create custom edges.
Here is the definition of the fork horizontal to-path. It uses the powerful coordinate calculations feature introduced in PGF 2.00.
.. sourcecode:: latex
...
\usetikzlibrary{calc}
...
\tikzstyle{fork horizontal} =[to path={
-| ($(\tikztostart)!0.5!(\tikztotarget)$) |- (\tikztotarget) \tikztonodes}]
Note: This example requires PGF 2.00 or later.
Generated with:
$ dot2tex --crop sportsbracket.dot > sportsbracket.tex
digraph G {
// Put our custom fork horizontal to path in the document preamble
d2tdocpreamble = "\usetikzlibrary{calc}\
\tikzstyle{fork horizontal} =[to path={\
-| ($(\tikztostart)!0.5!(\tikztotarget)$) |- (\tikztotarget) \tikztonodes}]";
rankdir=LR
node [shape=box, width=2]
graph [size="8.5,11" label="NCAA Men's Basketball: 2008 Tournament"]
11 [label="North Carolina"]
12 [label="Mount St. Mary's"]
13 [label="Indiana"]
14 [label="Arkansas"]
15 [label="Notre Dame"]
16 [label="George Mason"]
17 [label="Washington St."]
18 [label="Winthrop"]
19 [label="Oklahoma"]
110 [label="St. Joseph's"]
111 [label="Louisville"]
112 [label="Boise St."]
113 [label="Butler"]
114 [label="South Alabama"]
115 [label="Tennessee"]
116 [label="American"]
21 [label="North Carolina"]
22 [label="Arkansas"]
23 [label="Notre Dame"]
24 [label="Washington St."]
25 [label="Oklahoma"]
26 [label="Louisville"]
27 [label="Butler"]
28 [label="Tennessee"]
31 [label="North Carolina"]
32 [label="Washington St."]
33 [label="Louisville"]
34 [label="Tennessee"]
41 [label="North Carolina"]
42 [label="Louisville"]
51 [label="North Carolina"]
// Use the custom 'fork horizontal' to path defined above
edge [topath="fork horizontal"];
11:e->21:w
12:e->21:w
13:e->22:w
14:e->22:w
15:e->23:w
16:e->23:w
17:e->24:w
18:e->24:w
19:e->25:w
110:e->25:w
111:e->26:w
112:e->26:w
113:e->27:w
114:e->27:w
115:e->28:w
116:e->28:w
21:e->31:w
22:e->31:w
23:e->32:w
24:e->32:w
25:e->33:w
26:e->33:w
27:e->34:w
28:e->34:w
31:e->41:w
32:e->41:w
33:e->42:w
34:e->42:w
41:e->51:w
42:e->51:w
edge [style=invis]
rank=same {11->12->13->14->15->16->17->18->19->110->111->112->113->114->115->116}
}