Merge pull request #4494 from Citadel-Station-13/upstream-merge-32433

[MIRROR] [READY]Refactors projectile trajectories, fixes piercing projectile inaccuracy and beam rifle visual deflections

code/modules/projectiles/gun.dm

@@ -400,7 +400,8 @@
 
 /obj/item/gun/dropped(mob/user)
 	..()
-	zoom(user,FALSE)
+	if(zoomed)
+		zoom(user,FALSE)
 	if(azoom)
 		azoom.Remove(user)
 	if(alight)

code/modules/projectiles/guns/beam_rifle.dm

@@ -4,9 +4,6 @@
 #define ZOOM_LOCK_CENTER_VIEW 2
 #define ZOOM_LOCK_OFF 3
 
-#define ZOOM_SPEED_STEP 0
-#define ZOOM_SPEED_INSTANT 1
-
 #define AUTOZOOM_PIXEL_STEP_FACTOR 48
 
 #define AIMING_BEAM_ANGLE_CHANGE_THRESHOLD 0.1
@@ -45,7 +42,7 @@
 	var/lastangle = 0
 	var/aiming_lastangle = 0
 	var/mob/current_user = null
-	var/obj/effect/projectile_beam/current_tracer
+	var/list/obj/effect/projectile_beam/current_tracers
 
 	var/structure_piercing = 2				//Amount * 2. For some reason structures aren't respecting this unless you have it doubled. Probably with the objects in question's Bump() code instead of this but I'll deal with this later.
 	var/structure_bleed_coeff = 0.7
@@ -69,9 +66,8 @@
 	//ZOOMING
 	var/zoom_current_view_increase = 0
 	var/zoom_target_view_increase = 10
-	var/zoom_speed = ZOOM_SPEED_STEP
 	var/zooming = FALSE
-	var/zoom_lock = ZOOM_LOCK_AUTOZOOM_FREEMOVE
+	var/zoom_lock = ZOOM_LOCK_OFF
 	var/zooming_angle
 	var/current_zoom_x = 0
 	var/current_zoom_y = 0
@@ -80,7 +76,6 @@
 	var/static/image/charged_overlay = image(icon = 'icons/obj/guns/energy.dmi', icon_state = "esniper_charged")
 	var/static/image/drained_overlay = image(icon = 'icons/obj/guns/energy.dmi', icon_state = "esniper_empty")
 
-	var/datum/action/item_action/zoom_speed_action/zoom_speed_action
 	var/datum/action/item_action/zoom_lock_action/zoom_lock_action
 
 /obj/item/gun/energy/beam_rifle/debug
@@ -103,15 +98,6 @@
 	. = ..()
 
 /obj/item/gun/energy/beam_rifle/ui_action_click(owner, action)
-	if(istype(action, /datum/action/item_action/zoom_speed_action))
-		zoom_speed++
-		if(zoom_speed > 1)
-			zoom_speed = ZOOM_SPEED_STEP
-		switch(zoom_speed)
-			if(ZOOM_SPEED_STEP)
-				to_chat(owner, "<span class='boldnotice'>You switch [src]'s digital zoom to stepper mode.</span>")
-			if(ZOOM_SPEED_INSTANT)
-				to_chat(owner, "<span class='boldnotice'>You switch [src]'s digital zoom to instant mode.</span>")
 	if(istype(action, /datum/action/item_action/zoom_lock_action))
 		zoom_lock++
 		if(zoom_lock > 3)
@@ -135,8 +121,6 @@
 	var/total_time = SSfastprocess.wait
 	if(delay_override)
 		total_time = delay_override
-	if(zoom_speed == ZOOM_SPEED_INSTANT)
-		total_time = 0
 	zoom_animating = total_time
 	animate(current_user.client, pixel_x = current_zoom_x, pixel_y = current_zoom_y , total_time, SINE_EASING, ANIMATION_PARALLEL)
 	zoom_animating = 0
@@ -150,18 +134,10 @@
 /obj/item/gun/energy/beam_rifle/proc/handle_zooming()
 	if(!zooming || !check_user())
 		return
-	if(zoom_speed == ZOOM_SPEED_INSTANT)
-		current_user.client.change_view(world.view + zoom_target_view_increase)
-		zoom_current_view_increase = zoom_target_view_increase
-		set_autozoom_pixel_offsets_immediate(zooming_angle)
-		smooth_zooming()
-		return
-	if(zoom_current_view_increase > zoom_target_view_increase)
-		return
-	zoom_current_view_increase++
-	current_user.client.change_view(zoom_current_view_increase + world.view)
+	current_user.client.change_view(world.view + zoom_target_view_increase)
+	zoom_current_view_increase = zoom_target_view_increase
 	set_autozoom_pixel_offsets_immediate(zooming_angle)
-	smooth_zooming(SSfastprocess.wait * zoom_target_view_increase * zoom_speed)
+	smooth_zooming()
 
 /obj/item/gun/energy/beam_rifle/proc/start_zooming()
 	if(zoom_lock == ZOOM_LOCK_OFF)
@@ -169,8 +145,9 @@
 	zooming = TRUE
 
 /obj/item/gun/energy/beam_rifle/proc/stop_zooming()
-	zooming = FALSE
-	reset_zooming()
+	if(zooming)
+		zooming = FALSE
+		reset_zooming()
 
 /obj/item/gun/energy/beam_rifle/proc/reset_zooming()
 	if(!check_user(FALSE))
@@ -204,14 +181,14 @@
 
 /obj/item/gun/energy/beam_rifle/Initialize()
 	. = ..()
+	current_tracers = list()
 	START_PROCESSING(SSprojectiles, src)
-	zoom_speed_action = new(src)
 	zoom_lock_action = new(src)
 
 /obj/item/gun/energy/beam_rifle/Destroy()
 	STOP_PROCESSING(SSfastprocess, src)
 	set_user(null)
-	QDEL_NULL(current_tracer)
+	QDEL_LIST(current_tracers)
 	return ..()
 
 /obj/item/gun/energy/beam_rifle/emp_act(severity)
@@ -245,6 +222,7 @@
 
 /obj/item/gun/energy/beam_rifle/process()
 	if(!aiming)
+		last_process = world.time
 		return
 	check_user()
 	handle_zooming()
@@ -299,7 +277,7 @@
 	set waitfor = FALSE
 	aiming_time_left = aiming_time
 	aiming = FALSE
-	QDEL_NULL(current_tracer)
+	QDEL_LIST(current_tracers)
 	stop_zooming()
 
 /obj/item/gun/energy/beam_rifle/proc/set_user(mob/user)
@@ -341,7 +319,7 @@
 		sync_ammo()
 		afterattack(M.client.mouseObject, M, FALSE, M.client.mouseParams, passthrough = TRUE)
 	stop_aiming()
-	QDEL_NULL(current_tracer)
+	QDEL_LIST(current_tracers)
 	return ..()
 
 /obj/item/gun/energy/beam_rifle/afterattack(atom/target, mob/living/user, flag, params, passthrough = FALSE)
@@ -555,136 +533,103 @@
 		handle_impact(target)
 
 /obj/item/projectile/beam/beam_rifle/Collide(atom/target)
-	paused = TRUE
 	if(check_pierce(target))
 		permutated += target
 		return FALSE
 	if(!QDELETED(target))
 		cached = get_turf(target)
-	paused = FALSE
 	. = ..()
 
 /obj/item/projectile/beam/beam_rifle/on_hit(atom/target, blocked = FALSE)
-	paused = TRUE
 	if(!QDELETED(target))
 		cached = get_turf(target)
 	handle_hit(target)
-	paused = FALSE
 	. = ..()
 
 /obj/item/projectile/beam/beam_rifle/hitscan
 	icon_state = ""
 	var/tracer_type = /obj/effect/projectile_beam/tracer
-	var/starting_z
-	var/starting_p_x
-	var/starting_p_y
+	var/list/beam_segments	//assoc list of datum/point or datum/point/vector, start = end.
 	var/constant_tracer = FALSE
-	var/travelled_p_x = 0
-	var/travelled_p_y = 0
-	var/tracer_spawned = FALSE
+	var/beam_index
 
 /obj/item/projectile/beam/beam_rifle/hitscan/Destroy()
-	paused = TRUE	//STOP HITTING WHEN YOU'RE ALREADY BEING DELETED!
-	spawn_tracer(constant_tracer)
+	if(loc)
+		var/datum/point/pcache = trajectory.copy_to()
+		beam_segments[beam_index] = pcache
+	generate_tracers(constant_tracer)
 	return ..()
 
-/obj/item/projectile/beam/beam_rifle/hitscan/proc/spawn_tracer(put_in_rifle = FALSE)
-	if(tracer_spawned)
-		return
-	tracer_spawned = TRUE
-	//Remind me to port baystation trajectories so this shit isn't needed...
-	var/pixels_travelled = round(sqrt(travelled_p_x**2 + travelled_p_y**2),1)
-	var/scaling = pixels_travelled/world.icon_size
-	var/midpoint_p_x = round(starting_p_x + (travelled_p_x / 2))
-	var/midpoint_p_y = round(starting_p_y + (travelled_p_y / 2))
-	var/tracer_px = midpoint_p_x % world.icon_size
-	var/tracer_py = midpoint_p_y % world.icon_size
-	var/tracer_lx = (midpoint_p_x - tracer_px) / world.icon_size
-	var/tracer_ly = (midpoint_p_y - tracer_py) / world.icon_size
-	var/obj/effect/projectile_beam/PB = new tracer_type(src)
-	PB.apply_vars(Angle, tracer_px, tracer_py, color, scaling, locate(tracer_lx,tracer_ly,starting_z))
-	if(put_in_rifle && istype(gun))
-		if(gun.current_tracer)
-			QDEL_NULL(gun.current_tracer)
-		gun.current_tracer = PB
-	else
-		QDEL_IN(PB, 5)
+/obj/item/projectile/beam/beam_rifle/hitscan/Collide(atom/target)
+	var/datum/point/pcache = trajectory.copy_to()
+	. = ..()
+	if(. && !QDELETED(src))	//successful touch and not destroyed.
+		beam_segments[beam_index] = pcache
+		beam_index = pcache
+		beam_segments[beam_index] = null
 
-/obj/item/projectile/beam/beam_rifle/hitscan/proc/check_for_turf_edge(turf/T)
-	if(!istype(T))
-		return TRUE
-	var/tx = T.x
-	var/ty = T.y
-	if(tx < 10 || tx > (world.maxx - 10) || ty < 10 || ty > (world.maxy-10))
-		return TRUE
-	return FALSE
+/obj/item/projectile/beam/beam_rifle/hitscan/before_z_change(turf/oldloc, turf/newloc)
+	var/datum/point/pcache = trajectory.copy_to()
+	beam_segments[beam_index] = pcache
+	beam_index = RETURN_PRECISE_POINT(newloc)
+	beam_segments[beam_index] = null
+	return ..()
+
+/obj/item/projectile/beam/beam_rifle/hitscan/proc/generate_tracers(highlander = FALSE, cleanup = TRUE)
+	set waitfor = FALSE
+	if(highlander && istype(gun))
+		QDEL_LIST(gun.current_tracers)
+		for(var/datum/point/p in beam_segments)
+			gun.current_tracers += generate_projectile_beam_between_points(p, beam_segments[p], tracer_type, color, 0)
+	else
+		for(var/datum/point/p in beam_segments)
+			generate_projectile_beam_between_points(p, beam_segments[p], tracer_type, color, 5)
+	if(cleanup)
+		QDEL_LIST(beam_segments)
+		beam_segments = null
+		QDEL_NULL(beam_index)
 
 /obj/item/projectile/beam/beam_rifle/hitscan/fire(setAngle, atom/direct_target)	//oranges didn't let me make this a var the first time around so copypasta time
-	set waitfor = 0
+	set waitfor = FALSE
+	var/turf/starting = get_turf(src)
+	trajectory = new(starting.x, starting.y, starting.z, 0, 0, setAngle? setAngle : Angle, 33)
 	if(!log_override && firer && original)
 		add_logs(firer, original, "fired at", src, " [get_area(src)]")
+	fired = TRUE
 	if(setAngle)
 		Angle = setAngle
-	var/next_run = world.time
-	var/old_pixel_x = pixel_x
-	var/old_pixel_y = pixel_y
 	var/safety = 0	//The code works fine, but... just in case...
 	var/turf/c2
-	var/starting_x = loc.x
-	var/starting_y = loc.y
-	starting_z = loc.z
-	starting_p_x = starting_x * world.icon_size + pixel_x
-	starting_p_y = starting_y * world.icon_size + pixel_y
+	beam_segments = list()	//initialize segment list with the list for the first segment
+	beam_index = RETURN_PRECISE_POINT(src)
+	beam_segments[beam_index] = null	//record start.
+	if(spread)
+		Angle += (rand() - 0.5) * spread
 	while(loc)
+		if(paused || QDELETED(src))
+			return
 		if(++safety > (range * 3))	//If it's looping for way, way too long...
+			qdel(src)
+			stack_trace("WARNING: [type] projectile encountered infinite recursion in [__FILE__]/[__LINE__]!")
 			return	//Kill!
-		if(spread)
-			Angle += (rand() - 0.5) * spread
 		var/matrix/M = new
 		M.Turn(Angle)
 		transform = M
-		var/Pixel_x=sin(Angle)+16*sin(Angle)*2
-		var/Pixel_y=cos(Angle)+16*cos(Angle)*2
-		travelled_p_x += Pixel_x
-		travelled_p_y += Pixel_y
-		var/pixel_x_offset = old_pixel_x + Pixel_x
-		var/pixel_y_offset = old_pixel_y + Pixel_y
-		var/new_x = x
-		var/new_y = y
-		while(pixel_x_offset > 16)
-			pixel_x_offset -= 32
-			old_pixel_x -= 32
-			new_x++// x++
-		while(pixel_x_offset < -16)
-			pixel_x_offset += 32
-			old_pixel_x += 32
-			new_x--
-		while(pixel_y_offset > 16)
-			pixel_y_offset -= 32
-			old_pixel_y -= 32
-			new_y++
-		while(pixel_y_offset < -16)
-			pixel_y_offset += 32
-			old_pixel_y += 32
-			new_y--
-		pixel_x = old_pixel_x
-		pixel_y = old_pixel_y
-		step_towards(src, locate(new_x, new_y, z))
-		next_run += max(world.tick_lag, speed)
-		var/delay = next_run - world.time
-		if(delay <= world.tick_lag*2)
-			pixel_x = pixel_x_offset
-			pixel_y = pixel_y_offset
+		trajectory.increment()
+		var/turf/T = trajectory.return_turf()
+		if(T.z != loc.z)
+			before_z_change(loc, T)
+			trajectory_ignore_forcemove = TRUE
+			forceMove(T)
+			trajectory_ignore_forcemove = FALSE
 		else
-			animate(src, pixel_x = pixel_x_offset, pixel_y = pixel_y_offset, time = max(1, (delay <= 3 ? delay - 1 : delay)), flags = ANIMATION_END_NOW)
-		old_pixel_x = pixel_x_offset
-		old_pixel_y = pixel_y_offset
+			step_towards(src, T)
+		animate(src, pixel_x = trajectory.return_px(), pixel_y = trajectory.return_py(), time = 1, flags = ANIMATION_END_NOW)
+
 		if(can_hit_target(original, permutated))
 			Collide(original)
-		c2 = loc
 		Range()
-		if(check_for_turf_edge(loc))
-			spawn_tracer(constant_tracer)
+		c2 = get_turf(src)
 	if(istype(c2))
 		cached = c2
 
@@ -704,76 +649,3 @@
 /obj/item/projectile/beam/beam_rifle/hitscan/aiming_beam/on_hit()
 	qdel(src)
 	return FALSE
-
-/obj/effect/projectile_beam
-	icon = 'icons/obj/projectiles.dmi'
-	layer = ABOVE_MOB_LAYER
-	anchored = TRUE
-	light_power = 1
-	light_range = 2
-	light_color = "#00ffff"
-	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
-	flags_1 = ABSTRACT_1
-	appearance_flags = 0
-
-/obj/effect/projectile_beam/proc/scale_to(nx,ny,override=TRUE)
-	var/matrix/M
-	if(!override)
-		M = transform
-	else
-		M = new
-	M.Scale(nx,ny)
-	transform = M
-
-/obj/effect/projectile_beam/proc/turn_to(angle,override=TRUE)
-	var/matrix/M
-	if(!override)
-		M = transform
-	else
-		M = new
-	M.Turn(angle)
-	transform = M
-
-/obj/effect/projectile_beam/New(angle_override, p_x, p_y, color_override, scaling = 1)
-	if(angle_override && p_x && p_y && color_override && scaling)
-		apply_vars(angle_override, p_x, p_y, color_override, scaling)
-	return ..()
-
-/obj/effect/projectile_beam/proc/apply_vars(angle_override, p_x, p_y, color_override, scaling = 1, new_loc, increment = 0)
-	var/mutable_appearance/look = new(src)
-	look.pixel_x = p_x
-	look.pixel_y = p_y
-	if(color_override)
-		look.color = color_override
-	appearance = look
-	scale_to(1,scaling, FALSE)
-	turn_to(angle_override, FALSE)
-	if(!isnull(new_loc))	//If you want to null it just delete it...
-		forceMove(new_loc)
-	for(var/i in 1 to increment)
-		pixel_x += round((sin(angle_override)+16*sin(angle_override)*2), 1)
-		pixel_y += round((cos(angle_override)+16*cos(angle_override)*2), 1)
-
-/obj/effect/projectile_beam/tracer
-	icon_state = "tracer_beam"
-
-/obj/effect/projectile_beam/tracer/aiming
-	icon_state = "gbeam"
-
-/datum/action/item_action/zoom_speed_action
-	name = "Toggle Zooming Speed"
-	icon_icon = 'icons/mob/actions/actions_spells.dmi'
-	button_icon_state = "projectile"
-	background_icon_state = "bg_tech"
-
-/datum/action/item_action/zoom_lock_action
-	name = "Switch Zoom Mode"
-	icon_icon = 'icons/mob/actions/actions_items.dmi'
-	button_icon_state = "zoom_mode"
-	background_icon_state = "bg_tech"
-
-/obj/effect/projectile_beam/singularity_pull()
-	return
-
-/obj/effect/projectile_beam/singularity_act()
-	return

code/modules/projectiles/projectile.dm

@@ -31,16 +31,11 @@
 	var/last_projectile_move = 0
 	var/last_process = 0
 	var/time_offset = 0
-	var/old_pixel_x = 0
-	var/old_pixel_y = 0
-	var/pixel_x_increment = 0
-	var/pixel_y_increment = 0
-	var/pixel_x_offset = 0
-	var/pixel_y_offset = 0
-	var/new_x = 0
-	var/new_y = 0
+	var/datum/point/vector/trajectory
+	var/trajectory_ignore_forcemove = FALSE	//instructs forceMove to NOT reset our trajectory to the new location!
 
 	var/speed = 0.8			//Amount of deciseconds it takes for projectile to travel
+	var/pixel_speed = 33	//pixels per move - DO NOT FUCK WITH THIS UNLESS YOU ABSOLUTELY KNOW WHAT YOU ARE DOING OR UNEXPECTED THINGS /WILL/ HAPPEN!
 	var/Angle = 0
 	var/nondirectional_sprite = FALSE //Set TRUE to prevent projectiles from having their sprites rotated based on firing angle
 	var/spread = 0			//amount (in degrees) of projectile spread
@@ -48,6 +43,9 @@
 	var/ricochets = 0
 	var/ricochets_max = 2
 	var/ricochet_chance = 30
+
+	var/colliding = FALSE	//pause processing..
+
 	var/ignore_source_check = FALSE
 
 	var/damage = 10
@@ -168,20 +166,28 @@
 
 /obj/item/projectile/proc/vol_by_damage()
 	if(src.damage)
-		return CLAMP((src.damage) * 0.67, 30, 100)// Multiply projectile damage by 0.67, then clamp the value between 30 and 100
+		return CLAMP((src.damage) * 0.67, 30, 100)// Multiply projectile damage by 0.67, then CLAMP the value between 30 and 100
 	else
 		return 50 //if the projectile doesn't do damage, play its hitsound at 50% volume
 
+/obj/item/projectile/proc/on_ricochet(atom/A)
+	return
+
 /obj/item/projectile/Collide(atom/A)
+	colliding = TRUE
 	if(check_ricochet(A) && check_ricochet_flag(A) && ricochets < ricochets_max)
 		ricochets++
 		if(A.handle_ricochet(src))
+			on_ricochet(A)
 			ignore_source_check = TRUE
 			range = initial(range)
-			return FALSE
+			return TRUE
 	if(firer && !ignore_source_check)
 		if(A == firer || (A == firer.loc && ismecha(A))) //cannot shoot yourself or your mech
-			loc = A.loc
+			trajectory_ignore_forcemove = TRUE
+			forceMove(get_turf(A))
+			trajectory_ignore_forcemove = FALSE
+			colliding = FALSE
 			return FALSE
 
 	var/distance = get_dist(get_turf(A), starting) // Get the distance between the turf shot from and the mob we hit and use that for the calculations.
@@ -197,25 +203,32 @@
 
 	if(!prehit(A))
 		if(forcedodge)
-			loc = target_turf
+			trajectory_ignore_forcemove = TRUE
+			forceMove(target_turf)
+			trajectory_ignore_forcemove = FALSE
+		colliding = FALSE
 		return FALSE
 
 	var/permutation = A.bullet_act(src, def_zone) // searches for return value, could be deleted after run so check A isn't null
 	if(permutation == -1 || forcedodge)// the bullet passes through a dense object!
-		loc = target_turf
+		trajectory_ignore_forcemove = TRUE
+		forceMove(target_turf)
+		trajectory_ignore_forcemove = FALSE
 		if(A)
 			permutated.Add(A)
+		colliding = FALSE
 		return FALSE
 	else
 		var/atom/alt = select_target(A)
 		if(alt)
 			if(!prehit(alt))
+				colliding = FALSE
 				return FALSE
 			alt.bullet_act(src, def_zone)
 	qdel(src)
+	colliding = FALSE
 	return TRUE
 
-
 /obj/item/projectile/proc/select_target(atom/A)				//Selects another target from a wall if we hit a wall.
 	if(!A || !A.density || (A.flags_1 & ON_BORDER_1) || ismob(A) || A == original)	//if we hit a dense non-border obj or dense turf then we also hit one of the mobs or machines/structures on that tile.
 		return
@@ -246,12 +259,30 @@
 		return TRUE
 	return FALSE
 
+/obj/item/projectile/proc/return_predicted_turf_after_moves(moves, forced_angle)		//I say predicted because there's no telling that the projectile won't change direction/location in flight.
+	if(!trajectory && isnull(forced_angle) && isnull(Angle))
+		return FALSE
+	var/datum/point/vector/current = trajectory
+	if(!current)
+		var/turf/T = get_turf(src)
+		current = new(T.x, T.y, T.z, pixel_x, pixel_y, isnull(forced_angle)? Angle : forced_angle, pixel_speed)
+	var/datum/point/vector/v = current.return_vector_after_increments(moves)
+	return v.return_turf()
+
+/obj/item/projectile/proc/return_pathing_turfs_in_moves(moves, forced_angle)
+	var/turf/current = get_turf(src)
+	var/turf/ending = return_predicted_turf_after_moves(moves, forced_angle)
+	return getline(current, ending)
+
+/obj/item/projectile/proc/before_z_change(turf/oldloc, turf/newloc)
+	return
+
 /obj/item/projectile/Process_Spacemove(var/movement_dir = 0)
 	return TRUE	//Bullets don't drift in space
 
 /obj/item/projectile/process()
 	last_process = world.time
-	if(!loc || !fired)
+	if(!loc || !fired || !trajectory)
 		fired = FALSE
 		return PROCESS_KILL
 	if(paused || !isturf(loc))
@@ -285,73 +316,70 @@
 		setAngle(angle)
 	if(spread)
 		setAngle(Angle + ((rand() - 0.5) * spread))
+	var/turf/starting = get_turf(src)
 	if(isnull(Angle))	//Try to resolve through offsets if there's no angle set.
-		var/turf/starting = get_turf(src)
+		if(isnull(xo) || isnull(yo))
+			stack_trace("WARNING: Projectile [type] deleted due to being unable to resolve a target after angle was null!")
+			qdel(src)
+			return
 		var/turf/target = locate(CLAMP(starting + xo, 1, world.maxx), CLAMP(starting + yo, 1, world.maxy), starting.z)
 		setAngle(Get_Angle(src, target))
 	if(!nondirectional_sprite)
 		var/matrix/M = new
 		M.Turn(Angle)
 		transform = M
-	old_pixel_x = pixel_x
-	old_pixel_y = pixel_y
+	trajectory = new(starting.x, starting.y, starting.z, 0, 0, Angle, pixel_speed)
 	last_projectile_move = world.time
 	fired = TRUE
 	if(!isprocessing)
 		START_PROCESSING(SSprojectiles, src)
+	pixel_move(1)	//move it now!
 
 /obj/item/projectile/proc/setAngle(new_angle)	//wrapper for overrides.
 	Angle = new_angle
-	return TRUE
-
-/obj/item/projectile/proc/pixel_move(moves)
 	if(!nondirectional_sprite)
 		var/matrix/M = new
 		M.Turn(Angle)
 		transform = M
+	if(trajectory)
+		trajectory.set_angle(new_angle)
+	return TRUE
 
-	pixel_x_increment=round((sin(Angle)+16*sin(Angle)*2), 1)	//round() is a floor operation when only one argument is supplied, we don't want that here
-	pixel_y_increment=round((cos(Angle)+16*cos(Angle)*2), 1)
-	pixel_x_offset = old_pixel_x + pixel_x_increment
-	pixel_y_offset = old_pixel_y + pixel_y_increment
-	new_x = x
-	new_y = y
+/obj/item/projectile/forceMove(atom/target)
+	. = ..()
+	if(trajectory && !trajectory_ignore_forcemove && isturf(target))
+		trajectory.initialize_location(target.x, target.y, target.z, 0, 0)
 
-	while(pixel_x_offset > 16)
-		pixel_x_offset -= 32
-		old_pixel_x -= 32
-		new_x++// x++
-	while(pixel_x_offset < -16)
-		pixel_x_offset += 32
-		old_pixel_x += 32
-		new_x--
-	while(pixel_y_offset > 16)
-		pixel_y_offset -= 32
-		old_pixel_y -= 32
-		new_y++
-	while(pixel_y_offset < -16)
-		pixel_y_offset += 32
-		old_pixel_y += 32
-		new_y--
+/obj/item/projectile/proc/pixel_move(moves, trajectory_multiplier = 1)
+	if(!loc || !trajectory)
+		return
+	last_projectile_move = world.time
+	if(!nondirectional_sprite)
+		var/matrix/M = new
+		M.Turn(Angle)
+		transform = M
+	trajectory.increment(trajectory_multiplier)
+	var/turf/T = trajectory.return_turf()
+	if(T.z != loc.z)
+		before_z_change(loc, T)
+		trajectory_ignore_forcemove = TRUE
+		forceMove(T)
+		trajectory_ignore_forcemove = FALSE
+		pixel_x = trajectory.return_px()
+		pixel_y = trajectory.return_py()
+	else
+		step_towards(src, T)
+		pixel_x = trajectory.return_px() - trajectory.mpx * trajectory_multiplier
+		pixel_y = trajectory.return_py() - trajectory.mpy * trajectory_multiplier
+	animate(src, pixel_x = trajectory.return_px(), pixel_y = trajectory.return_py(), time = 1, flags = ANIMATION_END_NOW)
 
-	step_towards(src, locate(new_x, new_y, z))
-	pixel_x = old_pixel_x
-	pixel_y = old_pixel_y
-	animate(src, pixel_x = pixel_x_offset, pixel_y = pixel_y_offset, time = 1, flags = ANIMATION_END_NOW)
-	old_pixel_x = pixel_x_offset
-	old_pixel_y = pixel_y_offset
 	if(can_hit_target(original, permutated))
 		Collide(original)
 	Range()
-	last_projectile_move = world.time
 
 //Returns true if the target atom is on our current turf and above the right layer
 /obj/item/projectile/proc/can_hit_target(atom/target, var/list/passthrough)
-	if(target && (target.layer >= PROJECTILE_HIT_THRESHHOLD_LAYER) || ismob(target))
-		if(loc == get_turf(target))
-			if(!(target in passthrough))
-				return TRUE
-	return FALSE
+	return (target && ((target.layer >= PROJECTILE_HIT_THRESHHOLD_LAYER) || ismob(target)) && (loc == get_turf(target)) && (!(target in passthrough)))
 
 /obj/item/projectile/proc/preparePixelProjectile(atom/target, atom/source, params, spread = 0)
 	var/turf/curloc = get_turf(source)
@@ -362,7 +390,8 @@
 	if(targloc || !params)
 		yo = targloc.y - curloc.y
 		xo = targloc.x - curloc.x
-
+		setAngle(Get_Angle(src, targloc))
+		
 	if(isliving(source) && params)
 		var/list/calculated = calculate_projectile_angle_and_pixel_offsets(source, params)
 		p_x = calculated[2]
@@ -372,8 +401,13 @@
 			setAngle(calculated[1] + spread)
 		else
 			setAngle(calculated[1])
-	else
+	else if(targloc)
+		yo = targloc.y - curloc.y
+		xo = targloc.x - curloc.x
 		setAngle(Get_Angle(src, targloc))
+	else
+		stack_trace("WARNING: Projectile [type] fired without either mouse parameters, or a target atom to aim at!")
+		qdel(src)
 
 /proc/calculate_projectile_angle_and_pixel_offsets(mob/user, params)
 	var/list/mouse_control = params2list(params)

code/modules/space_transition/space_transition.dm

@@ -19,7 +19,7 @@ GLOBAL_LIST_EMPTY(z_levels_list)
 			neigbours[A] = src
 
 /datum/space_level/proc/set_neigbours(list/L)
-	for(var/datum/point/P in L)
+	for(var/datum/space_transition_point/P in L)
 		if(P.x == xi)
 			if(P.y == yi+1)
 				neigbours[TEXT_NORTH] = P.spl
@@ -35,13 +35,13 @@ GLOBAL_LIST_EMPTY(z_levels_list)
 				neigbours[TEXT_WEST] = P.spl
 				P.spl.neigbours[TEXT_EAST] = src
 
-/datum/point          //this is explicitly utilitarian datum type made specially for the space map generation and are absolutely unusable for anything else
+/datum/space_transition_point          //this is explicitly utilitarian datum type made specially for the space map generation and are absolutely unusable for anything else
 	var/list/neigbours = list()
 	var/x
 	var/y
 	var/datum/space_level/spl
 
-/datum/point/New(nx, ny, list/point_grid)
+/datum/space_transition_point/New(nx, ny, list/point_grid)
 	if(!point_grid)
 		qdel(src)
 		return
@@ -55,7 +55,7 @@ GLOBAL_LIST_EMPTY(z_levels_list)
 		return
 	point_grid[x][y] = src
 
-/datum/point/proc/set_neigbours(list/grid)
+/datum/space_transition_point/proc/set_neigbours(list/grid)
 	var/max_X = grid.len
 	var/list/max_Y = grid[1]
 	max_Y = max_Y.len
@@ -86,13 +86,13 @@ GLOBAL_LIST_EMPTY(z_levels_list)
 		k++
 	var/list/point_grid[conf_set_len*2+1][conf_set_len*2+1]
 	var/list/grid = list()
-	var/datum/point/P
+	var/datum/space_transition_point/P
 	for(var/i = 1, i<=conf_set_len*2+1, i++)
 		for(var/j = 1, j<=conf_set_len*2+1, j++)
-			P = new/datum/point(i,j, point_grid)
+			P = new/datum/space_transition_point(i,j, point_grid)
 			point_grid[i][j] = P
 			grid.Add(P)
-	for(var/datum/point/pnt in grid)
+	for(var/datum/space_transition_point/pnt in grid)
 		pnt.set_neigbours(point_grid)
 	P = point_grid[conf_set_len+1][conf_set_len+1]
 	var/list/possible_points = list()