Game maker Tower Defense - HELP!

[lepape]

Hi,
I'm currently trying to make a TD game using Game maker, and well, I'm a total newb. There's tons of things I'm trying to figure out how to do, but there's mainly two questions I have, so I thought I might get some good help here.

First, about enemies. From what I understand, most TD games only have one object being used for every wave, it's just the sprite of the object that's being changed. That way, towers can always target "obj_enemy", for example. What I'd like to do would be to have many enemies with different behaviors. For example, one enemy would deflect all projectiles, another would spawn smaller enemies upon dying, etc. Should I use multiple enemy objects in this case, or should I add tons of variables on the same "obj_enemy" for all possible behaviors?

Also, I'm trying to use some grid system when building towers, so the tower would only move one square at a time when placing it. I tried to find info on how to do that, but I'm wondering if that's even possible in GM.

Thanks,

[The Noid]

I'm not sure how GM goes about interfaces and inheritance, but in "normal" object oriented programming languages you would make an interface "Enemy" that list the properties that every enemy type has, like hp, location, speed.
For each different enemy type you would make a class "SpecificEnemyX" that implements the interface "Enemy".
That way your targeting routine would know that SpecificEnemy1 and SpecificEnemy2 both have the features listed in Enemy.

[Slogsweep]

And possibly an Abstract class inbetween where you'd write the generic enemy code

[Fireblade]

yes, u can use grid with the towers, read 1 of the tutorials about that mazish game on yoyogames.com , i cant help u personaly right now because i havnt gotten gm after i got my new 500gb

[Sammual]

I was working on a GM TD game a while back. Now that I have time I'm planning on getting back into it. If you want any help just let me know.

Sammual
Sammual at juno and then dot com