GraphvizでRubyのロゴは描けますか？

(追記：2014-3-3) Gvizについてのまとめ頁を作りました。

Gvizの目次 - Rubyの世界からGraphvizの世界にこんにちは！

ええ、まあなんとか。

ここではGraphvizのRubyラッパー「Gviz」を使います。

まずはgraph.ruにrouteを使ってノードとエッジの繋がりを書きます。

route :a1 => [:a2, :b1, :b2], :a2 => [:a3, :b2, :b3], :a3 => [:b3, :b4]
route :b1 => :b2, :b2 => :b3, :b3 => :b4
route [:b1, :b2, :b3, :b4] => :c

save :ruby

gvizコマンドでグラフを生成して、ファイルをオープンします。

% gviz
% open ruby.dot

rubylogo noshadow

rankを使ってノードの概略の配置を決めます。

route :a1 => [:a2, :b1, :b2], :a2 => [:a3, :b2, :b3], :a3 => [:b3, :b4]
route :b1 => :b2, :b2 => :b3, :b3 => :b4
route [:b1, :b2, :b3, :b4] => :c

+ rank :same, :a1, :a2, :a3
+ rank :same, :b1, :b2, :b3, :b4

save :ruby

再度gvizします。

rubylogo noshadow

ノードのshapeをpointとし、エッジの矢印を消します。

route :a1 => [:a2, :b1, :b2], :a2 => [:a3, :b2, :b3], :a3 => [:b3, :b4]
route :b1 => :b2, :b2 => :b3, :b3 => :b4
route [:b1, :b2, :b3, :b4] => :c

rank :same, :a1, :a2, :a3
rank :same, :b1, :b2, :b3, :b4

+ nodes shape:'point'
+ edges arrowhead:'none'

save :ruby

再度gvizします。

rubylogo noshadow

エッジ最小長さを規定して形を調整します。

route :a1 => [:a2, :b1, :b2], :a2 => [:a3, :b2, :b3], :a3 => [:b3, :b4]
route :b1 => :b2, :b2 => :b3, :b3 => :b4
route [:b1, :b2, :b3, :b4] => :c

rank :same, :a1, :a2, :a3
rank :same, :b1, :b2, :b3, :b4

nodes shape:'point'
edges arrowhead:'none'

+ [:b1_b2, :b2_b3, :b3_b4].each { |e| edge e, minlen:4 }
+ edge '*_c', minlen:3

save :ruby

rubylogo noshadow

色と線の太さを調整します。

route :a1 => [:a2, :b1, :b2], :a2 => [:a3, :b2, :b3], :a3 => [:b3, :b4]
route :b1 => :b2, :b2 => :b3, :b3 => :b4
route [:b1, :b2, :b3, :b4] => :c

rank :same, :a1, :a2, :a3
rank :same, :b1, :b2, :b3, :b4

+ color = '#7A2121'
+ nodes shape:'point', color:color
+ edges arrowhead:'none', color:color, penwidth:6

[:b1_b2, :b2_b3, :b3_b4].each { |e| edge e, minlen:4 }
edge '*_c', minlen:3

save :ruby

rubylogo noshadow

Rubyの文字も入れましょう。

route :a1 => [:a2, :b1, :b2], :a2 => [:a3, :b2, :b3], :a3 => [:b3, :b4]
route :b1 => :b2, :b2 => :b3, :b3 => :b4
route [:b1, :b2, :b3, :b4] => :c

rank :same, :a1, :a2, :a3
+ rank :same, :b1, :b2, :b3, :b4, :Ruby

color = '#7A2121'
nodes shape:'point', color:color
edges arrowhead:'none', color:color, penwidth:6

[:b1_b2, :b2_b3, :b3_b4].each { |e| edge e, minlen:4 }
edge '*_c', minlen:3

+ node :Ruby, shape:'none', fontsize:100

save :ruby

rubylogo noshadow

ちょっとロゴの形が変わっちゃいましたね。調整します。

route :a1 => [:a2, :b1, :b2], :a2 => [:a3, :b2, :b3], :a3 => [:b3, :b4]
route :b1 => :b2, :b2 => :b3, :b3 => :b4
route [:b1, :b2, :b3, :b4] => :c

rank :same, :a1, :a2, :a3
rank :same, :b1, :b2, :b3, :b4, :Ruby

color = '#7A2121'
nodes shape:'point', color:color
+ edges arrowhead:'none', color:color, penwidth:9

+ [:b1_b2, :b2_b3, :b3_b4].each { |e| edge e, minlen:7 }
+ edge '*_c', minlen:4

node :Ruby, shape:'none', fontsize:100

save :ruby