function enemy::onAdd(%this)
{
   echo("Enemy created");
   // find a spawn point
   %spawnPoint = getRandom(1,4);
   %this.spawnPoint = %spawnPoint;
   switch(%spawnPoint) {
      case 1:
           %spawnPointX = -52;
           %spawnPointY = getRandom(-40,40);
      case 2:
           %spawnPointX = getRandom(-50,50);
           %spawnPointY = -40;
      case 3:
           %spawnPointX = 52;
           %spawnPointY = getRandom(-40,40);
      case 4:
           %spawnPointX = getRandom(-50,50);
           %spawnPointY = 40;
   }
   %speed = getRandom(10,20);
   %this.setPosition(%spawnPointX,%spawnPointY);
   %this.moveTo(0,0,%speed);
   %this.awardPoints = 10;

   %trail = new t2dParticleEffect() {
      scenegraph = sceneWindow2D.getSceneGraph();
      config = enemyTrailDataBlock;
   };
   %link = %trail.mount(%this, "0.000 0.000");
   %trail.playEffect(true);

}

//datablocks.cs
datablock t2dParticleEffect( enemyTrailDataBlock ) {
      effectFile = "~/data/particles/explode.eff";
      useEffectCollisions = "1";
      effectMode = "INFINITE";
      effectTime = "0";
      canSaveDynamicFields = "1";
      size = "1.647 1.647";
      CollisionPhysicsSend = "0";
      CollisionPhysicsReceive = "0";
      CollisionGroups = "0";
      CollisionLayers = "0";
      CollisionMaxIterations = "1";
      CollisionResponseMode = "RIGID";
      Restitution = "0.2";
      MaxLinearVelocity = "2500";
      MinAngularVelocity = "2.69349e-038";
      MaxAngularVelocity = "1e+010";
};