help checking were is the enemy

I am trying do the following, however i do not know how to check were the enemy is the current frame settings are 640 x 480

The play area currently 1280 x 960 TESTING

The line of sight is just a small active that is scaled and rotated between the enemy and the player.

spread a value "0" in the ID variable
of the enemies.
Start the loop "Number of enemies" times.

* LOOP enemies
+ Is the current enemy in the frame?
Enable Group
>>
* LOOP enemies

+ Is the current enemy NOT in the frame?
> Disable Group

== GROUP enemy loop ==

* LOOP enemies
ID of enemy is = LoopIndex("enemies")
> pick a enemy at random and Place line of sight

* LOOP enemies
ID of enemy is = LoopIndex("enemies")
+ Line of sight collides with player?
> Do something

I have a demo of this working if anyone is intrested.

Altough somewhat changed to also incorp the player hiding behind say a house/wall or other.

Each enemy works independ from each other and only the current enemy takes the required action.

All enemies copied and pasted onto the play area.

Even though i get little help i wish to share my sucess!

I'm interested!
Where can I view it?