Pixel projectile ricochets and reflections! (#1220)

code/game/atoms.dm

@@ -104,6 +104,9 @@
 
 	return ..()
 
+/atom/proc/handle_ricochet(obj/item/projectile/P)
+	return
+
 /atom/proc/CanPass(atom/movable/mover, turf/target, height=1.5)
 	return (!density || !height)
 

code/game/turfs/closed.dm

@@ -24,9 +24,6 @@
 /turf/closed/indestructible/oldshuttle/corner
 	icon_state = "corner"
 
-
-
-
 /turf/closed/indestructible/splashscreen
 	name = "Space Station 13"
 	icon = 'config/title_screens/images/blank.png'

code/game/turfs/simulated/wall/mineral_walls.dm

@@ -175,6 +175,7 @@
 	desc = "A light-weight titanium wall used in shuttles."
 	icon = 'icons/turf/walls/shuttle_wall.dmi'
 	icon_state = "map-shuttle"
+	flags = CAN_BE_DIRTY | CHECK_RICOCHET
 	sheet_type = /obj/item/stack/sheet/mineral/titanium
 	smooth = SMOOTH_MORE|SMOOTH_DIAGONAL
 	canSmoothWith = list(/turf/closed/wall/mineral/titanium, /obj/machinery/door/airlock/shuttle, /obj/machinery/door/airlock/, /turf/closed/wall/shuttle, /obj/structure/window/shuttle, /obj/structure/shuttle/engine/heater, /obj/structure/falsewall/titanium)

code/game/turfs/simulated/walls.dm

@@ -28,6 +28,20 @@
 /turf/closed/wall/attack_tk()
 	return
 
+/turf/closed/wall/handle_ricochet(obj/item/projectile/P)			//A huge pile of shitcode!
+	var/turf/p_turf = get_turf(P)
+	var/face_direction = get_dir(src, p_turf)
+	var/face_angle = dir2angle(face_direction)
+	var/incidence_s = get_angle_of_incidence(face_angle, P.Angle)
+	var/new_angle = face_angle + incidence_s
+	var/new_angle_s = new_angle
+	while(new_angle_s > 180)	// Translate to regular projectile degrees
+		new_angle_s -= 360
+	while(new_angle_s < -180)
+		new_angle_s += 360
+	P.Angle = new_angle_s
+	return TRUE
+
 /turf/closed/wall/proc/dismantle_wall(devastated=0, explode=0)
 	if(devastated)
 		devastate_wall()