graphviz 图片

digraph G{
p1->xxx
p1 [margin=0 shape=hexagon, style=bold, label=<<TABLE border="0" cellborder="0">
<TR><TD><IMG SRC="img.jpg"/></TD></TR>
<TR><TD>first line<br/><font point-size="8">text</font></TD></TR>
</TABLE>>]
}