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Dec 27 2012, 11:50 pm
Hmm.. The only case I can think of where setting loc will fail is when you try loc=locate(x,y,z) before run-time generation of the map. In this case, locate will return null.
Dec 27 2012, 11:51 pm
In response to Jemai1
Jemai1 wrote:
Hmm.. The only case I can think of where setting loc will fail is when you try loc=locate(x,y,z) before run-time generation of the map.

Maybe it was setting the loc of two things to the same loc in the same tick? I can't remember.
Dec 27 2012, 11:54 pm
I believe you're talking about Move instead. Setting loc doesn't do any checking or whatsoever. It simply sets the location.
Dec 27 2012, 11:55 pm
In response to Jemai1
Jemai1 wrote:
I believe you're talking about Move instead. Setting loc doesn't do any checking or whatsoever. It simply sets the location.

I'll dig up the source where it occured. Perhaps it was a bug.
Dec 28 2012, 12:03 am
Hmm, turns out it was if Cross() returns 0 before a delayed loc = blah is set to happen.

area/transfer
    icon = 'transfer.dmi'
    var/loc_tag = null as text
    layer = FLY_LAYER
    mouse_opacity = 0
    //invisibility = 101

    Enter(atom/movable/a) //using Enter() instead of Entered() so that people or objects can't block transfers
        switch(src.CanTransfer(a))
            if(1)
                var/location = locate(src.loc_tag)
                a.Transfer(location)
                src.Transferred(a)
                return ..()
            if(2)
                return ..()
            if(0)
                return 0

    proc/CanTransfer(atom/movable/a)
        return 1

    proc/Transferred(atom/movable/a)

atom/movable
    var/tmp/transferring = 0

    proc/Transfer(atom/location)
        if(!location) return

        src.transferring = 1

        spawn(get_speed_delay(src.get_speed()))
            //src.x = location.x //we must set x y and z because setting loc can cause black outs
            //src.y = location.y
            //src.z = location.z
            src.loc = location //black screen!!

            spawn(world.tick_lag)
                src.transferring = 0


This would happen when the destination location had a box on it which overrode Cross() and returned 0
Dec 28 2012, 12:12 am
Are you certain that location is a turf? loc = locate(location.x,location.y,location.z) shouldn't pose any problem.
Dec 28 2012, 12:20 am
loc_tag is a text tag

either way, i changed my advice code.

my code base is more confusing.
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