title: Shape manipulation with openFrameworks
body: <p>I'm a openFrameworks newbie. I am learning basic 2d drawing which is all great so far. I have drawn a circle using:</p>
  
  <pre><code>ofSetColor(0x333333);
  ofFill;
  ofCircle(100,650,50);
  </code></pre>
  
  <p>My question is how do I give the circle a variable name so that I can manipulate in the mousepressed method? I tried adding a name before the ofCircle</p>
  
  <pre><code>theball.ofSetColor(0x333333);
  theball.ofFill;
  theball.ofCircle(100,650,50);
  </code></pre>
  
  <p>but get I 'theball' was not declared in this scope error.</p>