Turf Changing!

ID:162335
 
Jan 23 2008, 2:56 am
I was wanting to make an attack (a projectile, actually) that when fired, it'll cause the ground under it to freeze into ice along the path the projectile has gone. I have no idea how to do this...

Anyhow, here is the projectile code that I have. I'm not sure exactly what is needed, so I'll post the entire thing.


obj
    var/mob/owner //This var will reference the owner
    waterproj
        icon='proj.dmi'
        icon_state="water"
        density = 1
        Bump(mob/M)
            if(istype(M,/mob))
                if(!owner) del src //Deletes itself if there is no owner to avoid runtimes
                var/damage=round(owner.maxreiatsu/10)
                M.health-=damage
                view(6)<<"[M] takes [damage] damage."
                KOcheck(M)
mob
    verb
        Mizu_Houkou()
            usr.projectile(new/obj/waterproj(usr.loc),usr.dir,20)


mob
    proc
        projectile(obj/projectile,var/dir,var/delay)
            projectile.owner = src //Sets the mob as the owner of the projectile
            sleep(1)
            walk(projectile,dir)
            sleep(delay)
            del(projectile)


So let's say I'm standing on

turf/grass


and I want the grass under the projectile to turn into

turf/ice
Jan 23 2008, 7:26 am (Edited on Jan 23 2008, 10:48 am)
Edit: I was wrong, ignore this post.

Unfortunately, /turf's cannot be modified at runtime... howeverm you can either replace the /turf by creating a new /turf at that same location or, better yet, make a pseudo-turf (false /turf)

For a pseudo-turf, if you do go with it, you should modify Move() of /atom/movable to give it the "same properties" of a /turf: 
pseudo_turf       // Long live datums
   parent_type = /atom/movable   // The /pseudo_turf path we just made has the characteristics as a /atom/movable
   layer = TURF_LAYER+1

atom/movable/Move(NewLoc, Dir=0)    // Modifying Move() to make /pseudo_turf act like a turf
   var/pseudo_turf/P = locate() in NewLoc // Sees if a /pseudo_turf is in the next location
   if(P)
     .=P.Enter(src)       // Checks if the object can enter the fake turf
     if(.) .=P.Exit(src)
   .=..()
   if(.)                  // If everything's okay to leave
     if(P)
       .=P.Exited(src)|P.Entered(src)


I am sure there may be a better way to do the above.
Jan 23 2008, 8:31 am (Edited on Jan 23 2008, 8:37 am)
In response to GhostAnime
Turfs can be modified at runtime, they just can't be moved. There's no reason to create a 'psuedo-turf' even if turf couldn't be modified, because the problem here was creating a turf of type /turf/ice to replace another turf, which suffice to say, doesn't require changing any of that turf's properties.
Jan 23 2008, 10:10 am
In response to GhostAnime
Is there no simpler way of doing it that you know of? I hate to incorporate coding into my game when I don't know exactly how it works... it makes me nervous >_>
Jan 23 2008, 10:46 am
In response to DivineO'peanut
Hm, right, right, you are correct.
new/turf/ice(__loc of old__)


Though it may be tricky putting the old turf back... well, maybe not...
Jan 23 2008, 11:26 am
In response to GhostAnime
So how would I implement that?
Jan 23 2008, 3:38 pm
In response to GohanIdz
 
proc/iceturf(var/turf/T)
  if(!istype(T, /turf/ice))
    var/type = T.type
    var/turf/ice/I = new(T)
    spawn(50)
      new type(I)


Of course, you're going to lose any data stored in the old turf's variables when you do this.
Jan 24 2008, 2:37 am
In response to GhostAnime
Well, if you need to put the old turf back, this seems like a design problem, and the ice is better off being one of those 'psuedo-turfs' you mentioned... but that's not the problem posed. Putting it back is not a problem though, you just need to store whatever is important about it in a variable or a savefile.
Jan 25 2008, 8:24 am
In response to DivineO'peanut
not that i know much about coding but maybe you could set a time limit on this psuedoturf so that after that time period that turf would be erased leaving the original? Just like melting ice