drawActivation = function drawActivation(elem, bounds, verticalPos, conf, actorActivations) {
  var rect = getNoteRect();
  var g = bounds.anchored;
  rect.x = bounds.startx;
  rect.y = bounds.starty;
  rect.class = 'activation' + actorActivations % 3; // Will evaluate to 0, 1 or 2

  rect.width = bounds.stopx - bounds.startx;
  rect.height = verticalPos - bounds.starty;
  drawRect(g, rect);
}
Draws an actor in the diagram with the attaced line
@param center - The center of the the actor
@param pos The position if the actor in the list of actors
@param description The text in the box