シーケンス図を描く時はどんなツールを使ってますか？
PowerPoint? Eclipse? astah*? ペイント?
mscgenというシーケンス図を生成するツールがあることを知って目から鱗でした。
yumやapt-getでもインストールできるし、MacならHomebrewが使えます。
shell
% brew search mscgen
homebrew/x11/mscgen
% brew install homebrew/x11/mscgen
==> Tapping Homebrew/x11
Cloning into '/usr/local/Library/Taps/homebrew/homebrew-x11'...
remote: Counting objects: 93, done.
remote: Compressing objects: 100% (93/93), done.
remote: Total 93 (delta 0), reused 33 (delta 0), pack-reused 0
Unpacking objects: 100% (93/93), done.
Checking connectivity... done.
Warning: Could not create link for homebrew/x11/xastir, as it
conflicts with Homebrew/homebrew/xastir. You will need to use the
fully-qualified name when referring this formula, e.g.
brew install homebrew/x11/xastir
Tapped 90 formulae (205 files, 844K)
==> Installing mscgen from homebrew/homebrew-x11
==> Downloading http://www.mcternan.me.uk/mscgen/software/mscgen-src-0.20.tar.gz
######################################################################## 100.0%
==> ./configure --prefix=/usr/local/Cellar/mscgen/0.20
==> make install
🍺 /usr/local/Cellar/mscgen/0.20: 16 files, 200K, built in 13 seconds