

https://chart.apis.google.com/chart?cht=gv:neato
&chl=digraph{Goo->Choki->Par->Goo}&chs=200x200
https://chart.apis.google.com/chart?cht=gv:neato
&chl=graph{Meguro--Ebisu--Shibuya--Harajuku;
Shibuya--Daikanyama--Nakameguro--Yutenji;
Hiroo--Ebisu--Nakameguro}&chs=400x400