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Bubberstation/code/datums/elements/knockback.dm
MrMelbert ff6b41aa07 Afterattack is dead, long live Afterattack (#83818)
## About The Pull Request

- Afterattack is a very simple proc now: All it does is this, and all
it's used for is for having a convenient place to put effects an item
does after a successful attack (IE, the attack was not blocked)


![image](https://github.com/tgstation/tgstation/assets/51863163/1e70f7be-0990-4827-a60a-0c9dd0e0ee49)

- An overwhelming majority of afterattack implementations have been
moved to `interact_with_atom` or the new `ranged_interact_with_atom`

I have manually tested many of the refactored procs but there was 200+
so it's kinda hard

## Why It's Good For The Game

Afterattack is one of the worst parts of the attack chain, as it
simultaneously serves as a way of doing random interactions NOT AT ALL
related to attacks (despite the name) while ALSO serving as the defacto
way to do a ranged interaction with an item

This means careless coders (most of them) may throw stuff in afterattack
without realizing how wide reaching it is, which causes bugs. By making
two well defined, separate procs for handing adjacent vs ranged
interactions, it becomes WAY WAY WAY more easy to develop for.

If you want to do something when you click on something else and you're
adjacent, use `interact_with_atom`
If you want to do something when you click on something else and you're
not adjacent, use 'ranged_interact_with_atom`

This does result in some instances of boilerplate as shown here:


![image](https://github.com/tgstation/tgstation/assets/51863163/a7e469dd-115e-4e5b-88e0-0c664619c878)

But I think it's acceptable, feel free to oppose if you don't I'm sure
we can think of another solution

~~Additionally it makes it easier to implement swing combat. That's a
bonus I guess~~

## Changelog

🆑 Melbert
refactor: Over 200 item interactions have been refactored to use a
newer, easier-to-use system. Report any oddities with using items on
other objects you may see (such as surgery, reagent containers like cups
and spray bottles, or construction devices), especially using something
at range (such as guns or chisels)
refactor: Item-On-Modsuit interactions have changed slightly. While on
combat mode, you will attempt to "use" the item on the suit instead of
inserting it into the suit's storage. This means being on combat mode
while the suit's panel is open will block you from inserting items
entirely via click (but other methods such as hotkey, clicking on the
storage boxes, and mousedrop will still work).
refactor: The detective's scanner will now be inserted into storage
items if clicked normally, and will scan the storage item if on combat
mode
/🆑
2024-06-11 21:58:09 -07:00

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/**
* Mobs and items with this element will knock movable targets they hit away from them.
* Guns and turrets will instead fire projectiles with similar effects.
*/
/datum/element/knockback
/// distance the atom will be thrown
var/throw_distance
/// whether this can throw anchored targets (tables, etc)
var/throw_anchored
/// whether this is a gentle throw (default false means people thrown into walls are stunned / take damage)
var/throw_gentle
/datum/element/knockback/Attach(datum/target, throw_distance = 1, throw_anchored = FALSE, throw_gentle = FALSE)
. = ..()
if(ismachinery(target) || isstructure(target) || isgun(target) || isprojectilespell(target)) // turrets, etc
RegisterSignal(target, COMSIG_PROJECTILE_ON_HIT, PROC_REF(projectile_hit))
else if(isitem(target))
RegisterSignal(target, COMSIG_ITEM_AFTERATTACK, PROC_REF(item_afterattack))
else if(ishostile(target))
RegisterSignal(target, COMSIG_HOSTILE_POST_ATTACKINGTARGET, PROC_REF(hostile_attackingtarget))
else
return ELEMENT_INCOMPATIBLE
src.throw_distance = throw_distance
src.throw_anchored = throw_anchored
src.throw_gentle = throw_gentle
/datum/element/knockback/Detach(datum/source)
UnregisterSignal(source, list(COMSIG_ITEM_AFTERATTACK, COMSIG_HOSTILE_POST_ATTACKINGTARGET, COMSIG_PROJECTILE_ON_HIT))
return ..()
/// triggered after an item attacks something
/datum/element/knockback/proc/item_afterattack(obj/item/source, atom/target, mob/user, click_parameters)
SIGNAL_HANDLER
do_knockback(target, user, get_dir(source, target))
/// triggered after a hostile simplemob attacks something
/datum/element/knockback/proc/hostile_attackingtarget(mob/living/simple_animal/hostile/attacker, atom/target, success)
SIGNAL_HANDLER
if(!success)
return
do_knockback(target, attacker, get_dir(attacker, target))
/// triggered after a projectile hits something
/datum/element/knockback/proc/projectile_hit(datum/fired_from, atom/movable/firer, atom/target, Angle)
SIGNAL_HANDLER
do_knockback(target, null, angle2dir(Angle))
/**
* Throw a target in a direction
*
* Arguments:
* * target - Target atom to throw
* * thrower - Thing that caused this atom to be thrown
* * throw_dir - Direction to throw the atom
*/
/datum/element/knockback/proc/do_knockback(atom/target, mob/thrower, throw_dir)
if(!ismovable(target) || throw_dir == null)
return
var/atom/movable/throwee = target
if(throwee.anchored && !throw_anchored)
return
if(throw_distance < 0)
throw_dir = REVERSE_DIR(throw_dir)
throw_distance *= -1
var/atom/throw_target = get_edge_target_turf(throwee, throw_dir)
throwee.safe_throw_at(throw_target, throw_distance, 1, thrower, gentle = throw_gentle)