----------------- Part 6 - Section 1 ----------------- 

Code Sample 6.1.1

"
function FishClass::onWorldLimit(%this, %mode, %limit)
{
   switch$ (%limit)
   {
      case "left":
         %this.setLinearVelocityX(20);
         %this.setFlipX(false);
         %this.setPositionY(getRandom(-35, 25));

      case "right":   
         %this.setLinearVelocityX(-20);
         %this.setFlipX(true);
         %this.setPositionY(getRandom(-35, 25));
   }
}
"