Files
Bubberstation/code/modules/projectiles/ammunition/_ammunition.dm
SmArtKar ad111f4950 Spacemove refactor - Newtonian physics (#84869)
## About The Pull Request

This PR significantly enhances how zero-g movement works. Its no longer
locked to one of 8 directions, everything now has inertia and is
affected by weight. This means that throwing a piece of wire will no
longer completely reverse your movement direction, and that being thrown
out of mass driver no longer will slow you down to a halt at some point.

This leads to following gameplay changes:
* Guns now accelerate you. Ballistics have higher acceleration than
lasers, and higher calibers have higher acceleration than smaller ones.
This means that firing full-auto weapons in zero-g will make you drift
and accelerate significantly. While this can be a hilarious way to
travel in space, it makes using them trickier.
* Impacting a wall or an object while moving at high speeds will cause
you to violently crash into it as if you were thrown. Careful when
exploring!
* Jetpacks now have inertia. Changes introduced in #84712 have been
mostly reverted, although speed buff has been reduced to 0.3 instead of
0.5 (although this is compensated by new movement mechanics, so overall
speed should be roughly equal). All MODsuit jetpacks now possess the
speed boost. Advanced MODsuit jets (which has also been added back) and
captain's jetpack instead have higher acceleration and stabilization
power, providing much more precise control over your movement.
* Firing guns while moving on a jetpack will partially negate your
pack's acceleration, slowing you down. Non-advanced jetpacks'
stabilization is not enough to compensate for heavy caliber weaponry as
sniper rifles, shotguns or rocket launchers.
* You no longer instantly decelerate upon sliding along a wall. Instead,
it may take a few tiles if you are moving at extreme speeds. Passing
over lattices still allows you to grab onto them!

As space movement is angle-based instead of dir-based now, its much more
smooth than before due to using new movement logic.

Example of jetpack stabilization in action:

https://github.com/tgstation/tgstation/assets/44720187/6761a4fd-b7de-4523-97ea-38144b8aab41

And, of course, you can do this now.

![jetpack_500](https://github.com/tgstation/tgstation/assets/44720187/37b11cd8-2bd1-4640-ae0c-5e0cc505bf52)

**This pull request requires extensive gameplay testing before
merging**, as a large amount of numbers have been picked arbitrarily in
an attempt to keep consistency with previous behavior (guns and
normal-sized items applying 1 drift force, which is equal to what
everything applied before this PR). Jetpacks and impacts may also
require adjustments as to not be frustrating to use.

Closes #85165

## Why It's Good For The Game

Zero-G refactor - currently our zero-g movement is rather ugly and can
be uncomfortable to work with. A piece of cable being able to accelerate
you the same as a duffelbag full of items when thrown makes no sense,
and so does instantly changing directions. Inertia-based version is
smoother and more intuitive. This also makes being thrown into space
more of a hazard (possibly opening the door for explosive
decompressions?)
Jetpack inertia and gun changes - this is mostly a consequence of
inertia-based movement. However, zero-g combat being preferred during
modes like warops was an issue due to it negatively affecting everyone
without jetpacks which are in limited supply onboard. This reverts the
mobility changes which severely impacted space exploration, while making
zero-g combat more dangerous and having it require more skill to be a
viable option.

## What's left

- [x] Refactor moth wings to use jetpack code
- [x] Refactor functional wings to use jetpack code
- [x] Locate and fix a recursion runtime that sometimes occurs upon
splattering against a wall
- [x] Add craftable tethers and modify engineering MOD tethers to use
the same system

## Changelog
🆑
add: You can now craft tether anchors, which can be secured with a
wrench and attached to with right click. They won't let you drift into
space and you can adjust tether length/cut it via lmb/rmb/ctrl click on
the wire.
add: MOD tethers now remotely place and connect to tether anchors
instead of throwing you at where they landed.
balance: MOD tethers can now be used in gravity
balance: Jetpacks are now inertia-based. 
balance: Guns can accelerate you significantly in zero-g.
balance: All jetpacks now give you equal speed buff, however advanced
MOD ion jets and captain's jetpack have higher acceleration/deceleration
values.
refactor: Refactored zero-g movement to be inertia-based and utilize
angles instead of directions.
/🆑
2024-09-26 02:49:54 -07:00

165 lines
6.6 KiB
Plaintext

/obj/item/ammo_casing
name = "bullet casing"
desc = "A bullet casing."
icon = 'icons/obj/weapons/guns/ammo.dmi'
icon_state = "s-casing"
worn_icon_state = "bullet"
obj_flags = CONDUCTS_ELECTRICITY
slot_flags = ITEM_SLOT_BELT
throwforce = 0
w_class = WEIGHT_CLASS_TINY
custom_materials = list(/datum/material/iron = SMALL_MATERIAL_AMOUNT*5)
override_notes = TRUE
///What sound should play when this ammo is fired
var/fire_sound = null
///Which kind of guns it can be loaded into
var/caliber = null
///The bullet type to create when New() is called
var/projectile_type = null
///the loaded projectile in this ammo casing
var/obj/projectile/loaded_projectile = null
///Pellets for spreadshot
var/pellets = 1
///Variance for inaccuracy fundamental to the casing
var/variance = 0
///Randomspread for automatics
var/randomspread = 0
///Delay for energy weapons
var/delay = 0
///Override this to make your gun have a faster fire rate, in tenths of a second. 4 is the default gun cooldown.
var/click_cooldown_override = 0
///the visual effect appearing when the ammo is fired.
var/firing_effect_type = /obj/effect/temp_visual/dir_setting/firing_effect
///pacifism check for boolet, set to FALSE if bullet is non-lethal
var/harmful = TRUE
/// How much force is applied when fired in zero-G
var/newtonian_force = 1
///If set to true or false, this ammunition can or cannot misfire, regardless the gun can_misfire setting
var/can_misfire = null
///This is how much misfire probability is added to the gun when it fires this casing.
var/misfire_increment = 0
///If set, this casing will damage any gun it's fired from by the specified amount
var/integrity_damage = 0
/obj/item/ammo_casing/spent
name = "spent bullet casing"
loaded_projectile = null
/obj/item/ammo_casing/Initialize(mapload)
. = ..()
if(projectile_type)
loaded_projectile = new projectile_type(src)
pixel_x = base_pixel_x + rand(-10, 10)
pixel_y = base_pixel_y + rand(-10, 10)
setDir(pick(GLOB.alldirs))
update_appearance()
/obj/item/ammo_casing/Destroy()
var/turf/T = get_turf(src)
if(T && !loaded_projectile && is_station_level(T.z))
SSblackbox.record_feedback("tally", "station_mess_destroyed", 1, name)
QDEL_NULL(loaded_projectile)
return ..()
/obj/item/ammo_casing/add_weapon_description()
AddElement(/datum/element/weapon_description, attached_proc = PROC_REF(add_notes_ammo))
/**
*
* Outputs type-specific weapon stats for ammunition based on the projectile loaded inside the casing.
* Distinguishes between critting and stam-critting in separate lines
*
*/
/obj/item/ammo_casing/proc/add_notes_ammo()
// Try to get a projectile to derive stats from
var/obj/projectile/exam_proj = projectile_type
var/initial_damage = initial(exam_proj.damage)
var/initial_stamina = initial(exam_proj.stamina)
// projectile damage multiplier for guns with snowflaked damage multipliers
var/proj_damage_mult = 1
if(!ispath(exam_proj) || pellets == 0)
return
// are we in an ammo box?
if(isammobox(loc))
var/obj/item/ammo_box/our_box = loc
// is our ammo box in a gun?
if(isgun(our_box.loc))
var/obj/item/gun/our_gun = our_box.loc
// grab the damage multiplier
proj_damage_mult = our_gun.projectile_damage_multiplier
// if not, are we just in a gun e.g. chambered
else if(isgun(loc))
var/obj/item/gun/our_gun = loc
// grab the damage multiplier.
proj_damage_mult = our_gun.projectile_damage_multiplier
var/list/readout = list()
if(proj_damage_mult <= 0 || (initial_damage <= 0 && initial_stamina <= 0))
return "Our legal team has determined the offensive nature of these [span_warning(caliber)] rounds to be esoteric."
// No dividing by 0
if(initial_damage)
readout += "Most monkeys our legal team subjected to these [span_warning(caliber)] rounds succumbed to their wounds after [span_warning("[HITS_TO_CRIT((initial(exam_proj.damage) * proj_damage_mult) * pellets)] shot\s")] at point-blank, taking [span_warning("[pellets] shot\s")] per round."
if(initial_stamina)
readout += "[!readout.len ? "Most monkeys" : "More fortunate monkeys"] collapsed from exhaustion after [span_warning("[HITS_TO_CRIT((initial(exam_proj.stamina) * proj_damage_mult) * pellets)] impact\s")] of these [span_warning("[caliber]")] rounds."
return readout.Join("\n") // Sending over a single string, rather than the whole list
/obj/item/ammo_casing/update_icon_state()
icon_state = "[initial(icon_state)][loaded_projectile ? "-live" : null]"
return ..()
/obj/item/ammo_casing/update_desc()
desc = "[initial(desc)][loaded_projectile ? null : " This one is spent."]"
return ..()
/*
* On accidental consumption, 'spend' the ammo, and add in some gunpowder
*/
/obj/item/ammo_casing/on_accidental_consumption(mob/living/carbon/victim, mob/living/carbon/user, obj/item/source_item, discover_after = TRUE)
if(loaded_projectile)
loaded_projectile = null
update_appearance()
victim.reagents?.add_reagent(/datum/reagent/gunpowder, 3)
source_item?.reagents?.add_reagent(/datum/reagent/gunpowder, source_item.reagents.total_volume*(2/3))
return ..()
//proc to magically refill a casing with a new projectile
/obj/item/ammo_casing/proc/newshot() //For energy weapons, syringe gun, shotgun shells and wands (!).
if(!loaded_projectile)
loaded_projectile = new projectile_type(src, src)
/obj/item/ammo_casing/attackby(obj/item/I, mob/user, params)
if(istype(I, /obj/item/ammo_box))
var/obj/item/ammo_box/box = I
if(isturf(loc))
var/boolets = 0
for(var/obj/item/ammo_casing/bullet in loc)
if (box.stored_ammo.len >= box.max_ammo)
break
if (bullet.loaded_projectile)
if (box.give_round(bullet, 0))
boolets++
else
continue
if (boolets > 0)
box.update_appearance()
to_chat(user, span_notice("You collect [boolets] shell\s. [box] now contains [box.stored_ammo.len] shell\s."))
else
to_chat(user, span_warning("You fail to collect anything!"))
else
return ..()
/obj/item/ammo_casing/throw_impact(atom/hit_atom, datum/thrownthing/throwingdatum)
bounce_away(FALSE, NONE)
return ..()
/obj/item/ammo_casing/proc/bounce_away(still_warm = FALSE, bounce_delay = 3)
update_appearance()
SpinAnimation(10, 1)
var/turf/T = get_turf(src)
if(still_warm && T?.bullet_sizzle)
addtimer(CALLBACK(GLOBAL_PROC, GLOBAL_PROC_REF(playsound), src, 'sound/items/tools/welder.ogg', 20, 1), bounce_delay) //If the turf is made of water and the shell casing is still hot, make a sizzling sound when it's ejected.
else if(T?.bullet_bounce_sound)
addtimer(CALLBACK(GLOBAL_PROC, GLOBAL_PROC_REF(playsound), src, T.bullet_bounce_sound, 20, 1), bounce_delay) //Soft / non-solid turfs that shouldn't make a sound when a shell casing is ejected over them.