Change density of turf of specific mob

ID:2027502
 
Jan 30 2016, 8:23 pm
(See the best response by Azurift.)
Code:
turf
    wall
        icon = 'rock.dmi'
        density = 1


Problem description: I create a turf that represents a wall, setting its density to 1 as walls can not be passed but there are some cases that I want to sets its density to 0 so it can actually be passed, but only for the current player (after he/she performed some actions). How can I do w/o making it for all the players? Consider for example I have a proc set_density under mob and want from there to change the wall's density to 0 but only for the specific player and not for all...

Jan 30 2016, 9:40 pm
It depends on how exactly you want to choose who can go through the wall and who cannot.

One potential way is to modify the turf/Enter proc, this is the proc that checks whether a mob can pass into the turf and either permits (returns 1) or denies (returns 0) entry into the turf, the standard behavior is based on density.

But by overriding the Enter() proc for that specific type with your own code you can make ways to permit specific mobs entry.
Jan 31 2016, 3:46 am
In response to Clusterfack
Clusterfack wrote:
It depends on how exactly you want to choose who can go through the wall and who cannot.

One potential way is to modify the turf/Enter proc, this is the proc that checks whether a mob can pass into the turf and either permits (returns 1) or denies (returns 0) entry into the turf, the standard behavior is based on density.

But by overriding the Enter() proc for that specific type with your own code you can make ways to permit specific mobs entry.

turf/MonsterBlock
    density=1
    Enter(mob/M)    //this gets ran when somebody tries to enter this location
        if(ismob(M))
            if(!istype(M,/mob/Monster))
                return 1 //returning 1 here will automaticaly allow any non monsters to enter
Jan 31 2016, 2:59 pm
Following the previous 2 responses, I would do something like this:

/* Somewhere... */
turf/MagicWall
    var
        list/allowed = list()

    Enter(mob/m)
        if(m in allowed)
            return TRUE
        else
            return FALSE

/* Somewhere else... */
mob
    verb
        getAccessToMagicWall()
            var/turf/MagicWall/mw = locate(/turf/MagicWall)
            mw.allowed.Add(src)


This is a very basic example, and would not work under a ton of particular circumstances (like if you had multiple instances of /turf/MagicWall).
Jan 31 2016, 5:11 pm (Edited on Jan 31 2016, 10:14 pm)
Best response
Here's my version:

mob/player/verb/thePower()
    thePower = !thePower
    if (thePower)
        usr << "You have activated the power; you can walk through magic walls now!"
    else
        usr << "You have deactivated the power; you're back to being boring. Yay!"

turf/magicwall
    icon = 'turf.dmi'
    icon_state = "magicwall"
    density = 1
    desc = "A magic wall; only those with the power can step through it!"
    Enter(mob/M)
        if(M.client)                // check to see if the mob in question has a client, thus making it a player
            var/mob/player/P = M    // cast the mob as a player to gain the attributes of it(like thePower)
            if(P.thePower)          // check to see if the mob (player) has thePower activated...
                return TRUE         // allow this mob (player) to enter this turf
            else                    // if the mob (player) does not meet the above criteria...
                return FALSE        // then do not allow the mob (player) to enter
        return ..()

Obviously you'll have to add a "thePower" boolean variable to Player. Hope this helps!

EDIT: Took a nap and looked at my code again--I forgot the return ..() call!
Feb 1 2016, 2:23 am
Typical Goose. Best solution in the most unweildly and unfriendly way possible.

I love it.