protected override void OnUpdate()
 {
     base.OnUpdate();
     foreach (MFEntity e in entitySpriteDict.Keys)
     {
         MFQuadSprite s = entitySpriteDict[e] as MFQuadSprite;
         if (s != null)
         {
             Rectangle rect = new Rectangle((int)(e.rectangle.left * 120) + Env.screenWidth / 2,
                                            (int)(e.rectangle.top * 120) + Env.screenHeight / 2,
                                            (int)(e.rectangle.width * 120),
                                            (int)(e.rectangle.height * 120));
             s.rect = rect;
         }
     }
 }
        private void OnEntitySpawned(object sender, EntityArgs args)
        {
            MFQuadSprite    sp    = new MFQuadSprite();
            MFMainGameLayer layer = MFLayer.GetLayer <MFMainGameLayer>();

            if (args.entity is MFBullet)
            {
                sp.texName = "bullet";
            }
            else
            {
                sp.texName = "ship";
            }
            if (layer != null)
            {
                layer.AddSprite(sp);
            }
            this.entitySpriteDict[args.entity] = sp;
        }