Procs

ID:272584
 
Oct 2 2008, 7:06 am
 
Projectile
    parent_type = /obj/
    var/damage = 0
    var/delay = 1
    var/moving = 0
    var/my_path = /Projectile/
    New()
        sleep(300)//If it doesn't get to its target in 30 seconds it will be deleted.
        del(src)

Projectile/Bump(atom/O)
    if(istype(O,/mob/))
        if(O.density)
            var/mob/M = O
            M.health -= src.damage
    if(istype(O,/turf/))
        if(O.density)
            del(src)
    if(istype(O,/obj/))
        var/obj/target = O
        if(target.can_destory)
            del(O)
            del(src)
    
    ..()

mob
    var/health = 100

obj
    var
        can_destory = null

atom
    Click()
        var/Projectile/PP   
        PP.Trace(src)
        ..() // do default action


/Projectile/proc/Trace(atom/P)
    var/PJ = new src( usr.loc) 
    walk_to(PJ,P)


Projectile
    Move()
        if(src.moving) // If they are moving..
            return // Stop
        else
            src.moving = 1   // Set there Moveing to 1.
            ..() // Calls the defualt of the Move() proc, which is to move of course :).
            sleep(src.delay) // Sleeps the Move_Delay's set amount.
            src.moving = 0


OK How would I fix this where so
runtime error: Cannot execute null.Trace(). proc name: Click (/atom/Click) usr: HXR_Wheaties (/mob) src: the turf (6,9,1) (/turf) call stack: the turf (6,9,1) (/turf): Click(the turf (6,9,1) (/turf), "mapwindow.map", "icon-x=24;icon-y=14;left=1")

Won't appear?
Oct 2 2008, 7:26 am
HXR_Wheaties programmed:
> Projectile
>   var/my_path = /Projectile/
>   New()
>       sleep(300)//If it doesn't get to its target in 30 seconds it will be deleted.
        del src


The my_path var is useless - look up the built-in type variable. And instead of sleep(), you should use spawn() so the proc returns instead of hanging for 30 seconds (which also hangs callers of new()). Same thing in Move().

> atom
>   Click()
>       var/Projectile/PP   
>       PP.Trace(src)
>       ..() // do default action


Before using it, you need to set the PP var to an actual value (the = operator is for setting vars to values) instead of giving it no value therefore its value remains null. You can't just define a var and expect to do something with it without giving it a value - Dream Maker can't automagically guess what value you'd like it to have, irregardless of it being defined to reference something of the /Projectile type (which is used mostly for compile-time error checking anyway).
What object are you exactly trying to call the Trace() proc on? Currently you're calling it on none, hence your error. Maybe you want src (the object clicked on) and you've confused things?

 /Projectile/proc/Trace(atom/P)
>   var/PJ = new src( usr.loc) 
>   walk_to(PJ,P)


new() takes a type path there, where you've used src, but src is an object, not a type path. If you want to create a new object of the same type of src, use src's type var, mentioned above.
Oct 2 2008, 7:38 am
In response to Kaioken
I want to call it on where I clicked?
Oct 2 2008, 7:54 am
In response to HXR_Wheaties
I've already answered what var you need to use in my previous post, then, and that kind of info is also available from common knowledge and the DM Reference. Anyway, if you want something specific to happen when you click on a projectile, then only override the projectiles' Click() proc, not all atoms': 
/Projectile/Click()
   //do stuff
Oct 2 2008, 8:02 am
In response to Kaioken
OK, Thanks