Trails in Developer Help

ID:157546
 
Feb 16 2010, 12:40 pm
What is a simple way that you can create a trail on a moving object? Here is what I tried... didnt work...

Edited for attempt at trail:
mob
    verb
        Fireballskill()
            var/obj/Fireball/S=new(src.loc)
        //    S.dir = src.dir

                
           // walk(S,src.dir)
obj
    trail
        icon = 'blood.dmi'
        icon_state = "blood1"
obj
    Fireball
        icon = 'fireball.dmi'
        icon_state = "small"
        Move()
            S.dir = src.dir
            walk(S,src.dir)
            new/obj/trail
            
        Bump(mob/M)
            if(ismob(M))
                S = new(loc)
                S.icon = 'fireball_hit.dmi'
                src << "Hit"
                del S
            else
                sleep(50)
                del S
                return
var/obj/Fireball/S

//            var/obj/Fireball/S=new(src.loc)


My original:
mob
    verb
        Fireballskill()
            var/obj/Fireball/S=new(src.loc)
            S.dir = src.dir
            walk(S,src.dir)

obj
    Fireball
        icon = 'fireball.dmi'
        icon_state = "small"
        Bump(mob/M)
            if(ismob(M))
                S = new(loc)
                S.icon = 'fireball_hit.dmi'
                src << "Hit"
                del S
            else
                sleep(50)
                del S
                return
var/obj/Fireball/S


Kaioken's demo was frankly too complicated I couldn't figure out how to use it.

#1 Feb 16 2010, 1:17 pm
[EDIT]
After looking at the code i can see how that can be confusing...

var/tmp/list/trails[0]
//Creates a new list for holding all the trails

Move(l,d)
    ..()
    //Moves the head of the trail

    for(var/v in trails)step(v,d)
    //Everything that's in the list of trails step in the head's direction

    trails+=new/obj/trails(l)
    //Add a new trail to the list

Del()
    for(var/v in trails)del(v)
    //Everything that's in the list of trails delete it

    ..()
    //Delete the head
#2 Feb 16 2010, 4:26 pm
In response to Tubutas (#1)
eh? looks like that is from library but would still need library to use.

EDIT:
mob
    verb
        Fireballskill()
            var/obj/Fireball/S=new(src.loc)
            S.dir = src.dir
            walk(S,src.dir)
obj
    trails
        icon = 'blood.dmi'
        icon_state = "blood1"
obj
    Fireball
        icon = 'fireball.dmi'
        icon_state = "small"
        Bump(mob/M)
            if(ismob(M))
                S = new(loc)
                S.icon = 'fireball_hit.dmi'
                src << "Hit"
                del S
            else
                sleep(50)
                del S
                return
        Move(l,d)
         ..()
        for(var/v in trails)step(v,d)
        trails+=new/obj/trails(l)
        Del()
        for(var/v in trails)del(v)
        ..()
var/obj/Fireball/S


This is cool, but its kinda randomized, and the fireball appears behind everything usually. Im still confused and I would like to just make a trail behind my object with the direction im facing and delete it after a certain period of time. Then hopefully I can build off of it for other attacks.
#3 Feb 16 2010, 5:27 pm (Edited on Feb 16 2010, 8:09 pm)
 
obj
  laser
    var/list/trail = list()
    Move()
      trail += new /obj/lasertrail(loc, dir)
      return ..()
    Del()
      for(var/obj/lasertrail/L in trail)
        del(trail)
      ..()
  lasertrail
    New(loc, dir)
      ..()
      src.dir = dir


<edit> Oops, was in a rush and forgot the New() for the lasertrail.
#4 Feb 16 2010, 6:55 pm (Edited on Feb 16 2010, 7:24 pm)
In response to Garthor (#3)
Ok, here is it for anybody else who wants to use or learn from it:

var/obj/laser/z
obj
    laser
        var/list/trail = list()
        icon = '.dmi'
        icon_state = ""
        Move()
            dir = src.dir
            walk(src,src.dir)
            trail += new /obj/lasertrail(loc, dir)
            return ..()
        Del()
            for(var/obj/lasertrail/L in trail)
                del(trail)
            ..()
    lasertrail
        icon = '.dmi'
        icon_state = ""
mob
    verb
        splazor()
            var/obj/laser/z=new(src.loc)
            z.dir = src.dir
            walk(z,src.dir)
#5 Feb 17 2010, 5:16 pm
In response to Darkjohn66 (#2)
How do I use a for loop to delete an entire trail at once?
#6 Feb 17 2010, 5:20 pm
In response to Darkjohn66 (#5)
 
for(var/v in trail) del(v)