Problem with NPC AI.

ID:139052
 
Jul 24 2011, 12:51 pm
Code:
mob
    FollowNPC
        name = "Generic FollowNPC"
        icon = 'base.dmi'
        var/mob/target = 0
        var/mode = "Total Retaliation"
        var/weapontype = ""
        New()
            ..()
            serp
                if(mode == "Attack")
                    var/mob/D = locate() in oview(src,8)
                    world << "It's in attack mode!"
                    if(!src.target)
                        world << "It doesn't have a target!"
                        if(D)
                            world << "It found someone!"
                            if(!target && src.owner != D)
                                target = D
                        else
                            world << "It isn't finding anyone."
                // irrelevant pieces of code
                if(src.target != 0 && src.target)
                    // if(get_dist(src,src.owner) <= 8)
                    if(get_dist(src,target) <= 8)
                        step_towards(src,target)
                    else
                        src.target = 0
                        src.canattack = 1
                    /* else
                        src.target = 0
                        src.canattack = 1*/
                else
                    if(src.target != 0)
                        src.target = 0
                        src.canattack = 1


Problem description: This is the code for an NPC that follows you around and fights for you. I cut out irrelevant pieces of code and did not include everything necessary to make it function, but this should give you the gist of what I'm trying to do. The problem I'm having is that when Mode is set to Attack it doesn't find any mobs so target never gets set and therefore it doesn't attack them. Any suggestions?
#1 Jul 24 2011, 1:03 pm
When you create it, do you make sure to have it's mode set to attack?
#2 Jul 24 2011, 1:08 pm
In response to Lugia319 (#1)
If you have it set to attack and it still does not work, you may want to try a different method of finding mobs, such as:
for(var/mob/m in view(src,8))
    if(m.client)
        target=m


EDIT: Also, why are you associating a numerical value to a /mob variable? Just leave it blank, there is no need for any = sign unless you want to give them a default target. If you want to give them a default target, you should set it to a /mob.
#3 Jul 24 2011, 1:09 pm
In response to Lugia319 (#1)
Lugia319 wrote:
When you create it, do you make sure to have it's mode set to attack?

No, Mode gets set in-game. All the world statements show up, but it says it's not finding anyone.

Albro1 wrote:
If you have it set to attack and it still does not work, you may want to try a different method of finding mobs, such as:
> for(var/mob/m in view(src,8))
>     if(m.client)
>         target=m
>

I already tried something similar to that with oview and it didn't change the outcome.
#4 Jul 24 2011, 1:12 pm
In response to Unwanted4Murder (#3)
Well, the only way it's going to look for a target is if it has the Attack mode when it is created, thus the New() proc.
#5 Jul 24 2011, 1:14 pm
In response to Lugia319 (#4)
Lugia319 wrote:
Well, the only way it's going to look for a target is if it has the Attack mode when it is created, thus the New() proc.

I didn't include the whole thing... it actually loops back to serp with a goto. I didn't include the goto line because I knew people would criticize me for it being inefficient, but I dunno how else to do it.
#6 Jul 24 2011, 1:15 pm
In response to Lugia319 (#4)
Lugia319 wrote:
Well, the only way it's going to look for a target is if it has the Attack mode when it is created, thus the New() proc.

This.
If you want a working AI proc, take a look at Forum_account's AI "library". It shows you how. Use an ai() proc, and do a 
spawn(1) ai()

at the end of it.

Then it will constantly cycle once it is created(Of course you have to call ai() in New().)

Thanks Lugia, I was looking at the specific code and completely ignored the fact that he was using all of this under New().

EDIT: To reply to your last post, U4M, keeping New() from completing is probably not the best idea. Best let the New() proc complete itself. Use a separate proc(My suggestion above) to do your AI actions.
#7 Jul 24 2011, 1:19 pm
In response to Albro1 (#6)
I changed it to a seperate proc and have it set to run itself after a 3 second spawn(). No change. Any other suggestions?

Edit: I just noticed that it also doesn't announce it when the NPC KOs another NPC / player (view(M,10) << "[M] has knocked out [src]!") or announce in the world chat when the NPC kills another player (world << "[M] has killed [src]!"). Could this be related?
#8 Jul 24 2011, 3:23 pm
In response to Unwanted4Murder (#7)
Here is a snippet for finding a target, if you're still in need of help.

<small>Edit: It's not messaging because you have it doing player( range/view/world << message ).</small>

mob

    Mob

        name = null

        icon = null

        var

            /* the target variable. */ mob/target = null

            /* the mode of the 'Mob'. */ mode = null

        New()

            ..()

            spawn() /* call the system. */ find_target()

        proc

            find_target()

                while( /* there is no target. */ !target )

                    /* loop through the mob's view. */ for( var/mob/player in oview ( src , 8 ) )

                        /* check if they are a client. */ if( player.client )

                            /* set the target. */ target = player

                            world << "A target was found! [target]"

                            break

                    /* if there is no target, announce no target was found. */ if( !target )

                        world << "No target was found!"

                    sleep( /* however long you want it to tick inbetween loops. */ 5 )