title: general way for using turtle graphics in ruby
body: <p>Is there a general way to use turtle graphics in ruby like this?</p>
  
  <pre><code>require 'turtle'
  Turtle.draw do
      pencolor blue
      forward 100
  end
  </code></pre>
  
  <p>I tried hackety-hack, which is nice but too buggy (crashes almost every minute). I am also trying rdf-turtle, but I have no idea how to draw a single line. Could somebody help me?</p>