Dir Restrictions

ID:169496
 
Jun 9 2005, 4:36 pm
i need to make a turf that allows a player to go one direction but not the other, so i no it'd be like...
turf
oneway
Entered()

but i dont the the commands, would it be like usr.dir? or how do i do it?

Jun 9 2005, 5:12 pm
In Enter() (and you want Enter() instead of Entered() because you're deciding if it should enter) the object entering is the argument, so you use it's dir variable.

turf
  cant_enter_from_the_north
    Enter(mob/M)
      if(istype(M) && M.dir == NORTH)  // If it's a mob and it's facing north...
        return 0                       // don't let it in.
      return ..()


Since I'm making sure only mobs can't enter from the north, /objs will be able to move through the turf normally.
Jun 9 2005, 5:24 pm
In response to YMIHere
ok thnx, but im kinda making a sidscrolling game, and i changed the line to make it so i cannot go west, but my guy kinda falls thru the ground now O.o, what do i do?
Jun 9 2005, 7:58 pm
In response to Bladeshifter
 
turf
  Cantgodown
    Exit(mob/M)
      if(istype(M) && M.dir == South)  // If it's a mob and it's facing South
        return 0                       // don't let it leave.
      else
        return ..()

try that it should work for what want
Jun 10 2005, 3:38 am
In response to Deathstar175
Deathstar175 wrote:
turf
>   Cantgodown
>     Exit(mob/M)
>       if(istype(M) && M.dir == South)  // If it's a mob and it's facing South
>         return 0                       // don't let it leave.
>       else
>         return ..()
>

try that it should work for what want

Well, no. You're checking for "if(M.dir == South)", which is completely invalid. See, the ten directions (eight cardinals plus UP and DOWN) are defined like so (taken from [link]):

//directions
var/const
    NORTH     =  1
    SOUTH     =  2
    EAST      =  4
    WEST      =  8
    NORTHEAST =  5
    NORTHWEST =  9
    SOUTHEAST =  6
    SOUTHWEST = 10
    UP        = 16
    DOWN      = 32


All of them are in caps, as you can see. Since DM, like most languages, is case-sensitive, your snippet actually wouldn't compile.

This one would work:

//don't allow mob entry from the north
turf/no_fall/Enter(mob/M)
    if(istype(M) && M.dir == SOUTH) return 0
    return ..()
Jun 10 2005, 3:41 am
In response to Wizkidd0123
Out of interest, would this work too?

turf/no_fall/Enter(mob/M)
    if(istype(M) && M.dir == 2) return 0
    return ..()
Jun 10 2005, 3:44 am
In response to DeathAwaitsU
Yes -- that would work!

For more details about directions, see EightDirections (bwicki page).
Jun 10 2005, 3:45 am
In response to Wizkidd0123
Ah well that simplifies my life a lot.
Jun 10 2005, 3:55 am
In response to DeathAwaitsU
DeathAwaitsU wrote:
Ah well that simplifies my life a lot.

Remember though -- just because numbers can be used instead of the constants doesn't mean that you should. Doing so would make your code a lot harder to read.

There's no reason, however, that the bitwise operators shouldn't make everything a whole lot simpler, if that's what you meant! =)
Jun 10 2005, 9:25 am (Edited on Jun 10 2005, 9:52 am)
Or, a way Garthor displayed it before:
var/list/nodirs=list(/turf/nonorth=NORTH,/turf/nosouthwest=list(SOU\
TH,WEST,SOUTHWEST))
turf
    Enter(mob/m)
       if(!(ismob(m))||!m.client)return
       if(m.dir in nodirs[src])return 0
       return ..()
    nonorth
    nosouthwest


I think that's how he did it, I can't remember.
[edit]Bleh, I had to fix something, I forgot to put /turf/ in the beginning!