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Bubberstation/code/datums/components/dart_insert.dm
SmArtKar 7f15e11993 Adds a new syringe gun mode and improves foam darts. (#89510) 
## About The Pull Request

This PR implements multiple new features:

Foam darts now can stick to people as long as their cap isn't removed.
Riot foam darts have a chance to jostle when you move with one stuck
inside of you, dealing a bit of stamina damage from the weight stuck to
your limbs.

Syringe guns received a second "low power" mode, toggleable with in-hand
right click. In this mode, syringes fired will embed into their target
and slowly leak their reagents instead of instantly delivering them.
Thankfully, they can be plucked out pretty quickly.

You can also insert syringes into uncapped (screwdriver-ed) foam darts
(similarly to pens) to achieve the same result, allowing you to get a
bootleg low-efficiency syringe gun.

Additionally, I fixed/cleaned up some embedding issues/code which I
found while coding this.

## Why It's Good For The Game

This allows players to explore new funny interactions between items and
chems, as we don't have a reliable slow release mechanism aside from IV
drips currently. And foam darts embedding it just (mostly) harmless
fluff, if someone figures out a way to cause havoc with it then I'll be
very proud of them (someone totally will).

## Changelog
🆑
add: Foam darts now stick to people when they have their cap on, riot
foam darts also can passively deal a bit of stamina damage when you move
with one.
add: Syringes can be inserted into foam darts, making them embed and
slowly leak their reagents into their victim.
add: Syringe guns can be toggled (with right click) between high power
and low power modes, former being their normal functionality and latter
making syringes embed and slowly leak their contents.
fix: Fixed projectiles sometimes not embedding when they should've
code: Cleaned embedding code up
/🆑
2025-03-01 22:52:19 +11:00

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/**
* Component for allowing items to be inserted into foam darts.
* The parent can register signal handlers for `COMSIG_DART_INSERT_ADDED`,
* `COMSIG_DART_INSERT_REMOVED` to define custom behavior for when the item
* is added to/removed from a dart, and `COMSIG_DART_INSERT_GET_VAR_MODIFIERS`
* to define the modifications the item makes to the vars of the fired projectile.
*/
/datum/component/dart_insert
/// List for tracking the modifications this component has made to the vars of the containing projectile
var/list/var_modifiers
/// A reference to the ammo casing this component's parent was inserted into
var/obj/item/ammo_casing/holder_casing
/// A reference to the projectile this component's parent was inserted into
var/obj/projectile/holder_projectile
/// The icon file used for the overlay applied over the containing ammo casing
var/casing_overlay_icon
/// The icon state used for the overlay applied over the containing ammo casing
var/casing_overlay_icon_state
/// The icon file used for the overlay applied over the containing projectile
var/projectile_overlay_icon
/// The icon state used for the overlay applied over the containing projectile
var/projectile_overlay_icon_state
/// Optional callback to invoke when acquiring projectile var modifiers
var/datum/callback/modifier_getter
/datum/component/dart_insert/Initialize(_casing_overlay_icon, _casing_overlay_icon_state, _projectile_overlay_icon, _projectile_overlay_icon_state, datum/callback/_modifier_getter)
if(!isitem(parent))
return COMPONENT_INCOMPATIBLE
casing_overlay_icon = _casing_overlay_icon
casing_overlay_icon_state = _casing_overlay_icon_state
projectile_overlay_icon = _projectile_overlay_icon
projectile_overlay_icon_state = _projectile_overlay_icon_state
modifier_getter = _modifier_getter
/datum/component/dart_insert/RegisterWithParent()
. = ..()
RegisterSignal(parent, COMSIG_ITEM_PRE_ATTACK, PROC_REF(on_preattack))
RegisterSignal(parent, COMSIG_OBJ_RESKIN, PROC_REF(on_reskin))
/datum/component/dart_insert/UnregisterFromParent()
. = ..()
var/obj/item/parent_item = parent
var/parent_loc = parent_item.loc
if(parent_loc && (parent_loc == holder_casing || parent_loc == holder_projectile))
parent_item.forceMove(get_turf(parent_item))
remove_from_dart(holder_casing, holder_projectile)
UnregisterSignal(parent, COMSIG_ITEM_PRE_ATTACK)
/datum/component/dart_insert/proc/on_preattack(datum/source, atom/target, mob/user, params)
SIGNAL_HANDLER
var/obj/item/ammo_casing/foam_dart/dart = target
if(!istype(dart))
return
if(!dart.modified)
to_chat(user, span_warning("The safety cap prevents you from inserting [parent] into [dart]."))
return COMPONENT_CANCEL_ATTACK_CHAIN
if(HAS_TRAIT(dart, TRAIT_DART_HAS_INSERT))
to_chat(user, span_warning("There's already something in [dart]."))
return COMPONENT_CANCEL_ATTACK_CHAIN
add_to_dart(dart, user)
return COMPONENT_CANCEL_ATTACK_CHAIN
/datum/component/dart_insert/proc/on_reskin(datum/source, mob/user, skin)
SIGNAL_HANDLER
SEND_SIGNAL(parent, COMSIG_DART_INSERT_PARENT_RESKINNED)
/datum/component/dart_insert/proc/add_to_dart(obj/item/ammo_casing/dart, mob/user)
var/obj/projectile/dart_projectile = dart.loaded_projectile
var/obj/item/parent_item = parent
if(user)
if(!user.transferItemToLoc(parent_item, dart_projectile))
return
to_chat(user, span_notice("You insert [parent_item] into [dart]."))
else
parent_item.forceMove(dart_projectile)
ADD_TRAIT(dart, TRAIT_DART_HAS_INSERT, REF(src))
RegisterSignal(dart, COMSIG_ITEM_ATTACK_SELF, PROC_REF(on_dart_attack_self))
RegisterSignal(dart, COMSIG_ATOM_EXAMINE_MORE, PROC_REF(on_dart_examine_more))
RegisterSignals(parent, list(COMSIG_QDELETING, COMSIG_MOVABLE_MOVED), PROC_REF(on_leave_dart))
RegisterSignal(dart, COMSIG_ATOM_UPDATE_OVERLAYS, PROC_REF(on_casing_update_overlays))
RegisterSignal(dart_projectile, COMSIG_ATOM_UPDATE_OVERLAYS, PROC_REF(on_projectile_update_overlays))
RegisterSignals(dart_projectile, list(COMSIG_PROJECTILE_ON_SPAWN_DROP, COMSIG_PROJECTILE_ON_SPAWN_EMBEDDED), PROC_REF(on_spawn_drop))
apply_var_modifiers(dart_projectile)
dart.harmful = dart_projectile.damage > 0 || dart_projectile.wound_bonus > 0 || dart_projectile.bare_wound_bonus > 0
SEND_SIGNAL(parent, COMSIG_DART_INSERT_ADDED, dart)
dart.update_appearance()
dart_projectile.update_appearance()
holder_casing = dart
holder_projectile = dart_projectile
/datum/component/dart_insert/proc/remove_from_dart(obj/item/ammo_casing/dart, obj/projectile/projectile, mob/user)
holder_casing = null
holder_projectile = null
if(istype(dart))
UnregisterSignal(dart, list(COMSIG_ITEM_ATTACK_SELF, COMSIG_ATOM_EXAMINE_MORE, COMSIG_ATOM_UPDATE_OVERLAYS))
REMOVE_TRAIT(dart, TRAIT_DART_HAS_INSERT, REF(src))
dart.update_appearance()
if(istype(projectile))
remove_var_modifiers(projectile)
UnregisterSignal(projectile, list(COMSIG_PROJECTILE_ON_SPAWN_DROP, COMSIG_PROJECTILE_ON_SPAWN_EMBEDDED, COMSIG_ATOM_UPDATE_OVERLAYS))
if(dart?.loaded_projectile == projectile)
dart.harmful = projectile.damage > 0 || projectile.wound_bonus > 0 || projectile.bare_wound_bonus > 0
projectile.update_appearance()
SEND_SIGNAL(parent, COMSIG_DART_INSERT_REMOVED, dart, projectile, user)
UnregisterSignal(parent, list(COMSIG_QDELETING, COMSIG_MOVABLE_MOVED))
if(user)
INVOKE_ASYNC(user, TYPE_PROC_REF(/mob, put_in_hands), parent)
to_chat(user, span_notice("You remove [parent] from [dart]."))
/datum/component/dart_insert/proc/on_dart_attack_self(datum/source, mob/user)
SIGNAL_HANDLER
remove_from_dart(holder_casing, holder_projectile, user)
/datum/component/dart_insert/proc/on_dart_examine_more(datum/source, mob/user, list/examine_list)
var/obj/item/parent_item = parent
examine_list += span_notice("You can see a [parent_item.name] inserted into it.")
/datum/component/dart_insert/proc/on_leave_dart()
SIGNAL_HANDLER
remove_from_dart(holder_casing, holder_projectile)
/datum/component/dart_insert/proc/on_spawn_drop(datum/source, obj/item/ammo_casing/new_casing)
SIGNAL_HANDLER
UnregisterSignal(parent, list(COMSIG_QDELETING, COMSIG_MOVABLE_MOVED))
add_to_dart(new_casing)
/datum/component/dart_insert/proc/on_casing_update_overlays(datum/source, list/new_overlays)
SIGNAL_HANDLER
new_overlays += mutable_appearance(casing_overlay_icon, casing_overlay_icon_state)
/datum/component/dart_insert/proc/on_projectile_update_overlays(datum/source, list/new_overlays)
SIGNAL_HANDLER
new_overlays += mutable_appearance(projectile_overlay_icon, projectile_overlay_icon_state)
/datum/component/dart_insert/proc/apply_var_modifiers(obj/projectile/projectile)
if (!modifier_getter)
return
var_modifiers = modifier_getter.Invoke(projectile)
projectile.damage += var_modifiers["damage"]
projectile.speed += var_modifiers["speed"]
projectile.armour_penetration += var_modifiers["armour_penetration"]
projectile.wound_bonus += var_modifiers["wound_bonus"]
projectile.bare_wound_bonus += var_modifiers["bare_wound_bonus"]
projectile.demolition_mod += var_modifiers["demolition_mod"]
if(var_modifiers["embedding"])
projectile.set_embed(var_modifiers["embedding"])
/datum/component/dart_insert/proc/remove_var_modifiers(obj/projectile/projectile)
projectile.damage -= var_modifiers["damage"]
projectile.speed -= var_modifiers["speed"]
projectile.armour_penetration -= var_modifiers["armour_penetration"]
projectile.wound_bonus -= var_modifiers["wound_bonus"]
projectile.bare_wound_bonus -= var_modifiers["bare_wound_bonus"]
projectile.demolition_mod -= var_modifiers["demolition_mod"]
if(var_modifiers["embedding"])
projectile.set_embed(initial(projectile.embed_type))
var_modifiers.Cut()
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