title: SIMPLE Ruby library for drawing shapes and managing clicks
body: <p>I am looking for <strong>simple</strong> library for Ruby that could help me drawing things on the screen. I am not developing a game, I just want to display some graphs, so I need to</p>
  
  <ul>
  <li>draw circles on a certain position,</li>
  <li>put a label on these circles,</li>
  <li>being notified that circle XYZ has been selected (I want to know the circle, not the coords),</li>
  <li>draw lines connecting circles' borders,</li>
  <li>change the color of the these circles,</li>
  <li><em>(optional)</em> animate moving a circle from position (x1,y1) to (x2,y2) in X seconds,</li>
  <li><em>(even more optional)</em> zoom on part of this scene.</li>
  </ul>
  
  <p>Do you know anything that could help me with this?</p>