Changes Shields

See PR for details

code/modules/shieldgen/shield_diffuser.dm

@@ -0,0 +1,74 @@
+/obj/machinery/shield_diffuser
+	name = "shield diffuser"
+	desc = "A small underfloor device specifically designed to disrupt energy barriers."
+	description_info = "This device disrupts shields on directly adjacent tiles (in a + shaped pattern). They are commonly installed around exterior airlocks to prevent shields from blocking EVA access."
+	icon = 'icons/obj/machines/shielding.dmi'
+	icon_state = "fdiffuser_on"
+	use_power = 2
+	idle_power_usage = 100
+	active_power_usage = 2000
+	anchored = 1
+	density = 0
+	level = 1
+	var/alarm = 0
+	var/enabled = 1
+
+/obj/machinery/shield_diffuser/New()
+	..()
+	var/turf/T = get_turf(src)
+	hide(!T.is_plating())
+
+//If underfloor, hide the cable
+/obj/machinery/shield_diffuser/hide(var/i)
+	if(istype(loc, /turf))
+		invisibility = i ? 101 : 0
+	update_icon()
+
+/obj/machinery/shield_diffuser/hides_under_flooring()
+	return 1
+
+/obj/machinery/shield_diffuser/process()
+	if(alarm)
+		alarm--
+		if(!alarm)
+			update_icon()
+		return
+
+	if(!enabled)
+		return
+	for(var/direction in cardinal)
+		var/turf/simulated/shielded_tile = get_step(get_turf(src), direction)
+		for(var/obj/effect/energy_field/S in shielded_tile)
+			qdel(S)
+
+/obj/machinery/shield_diffuser/update_icon()
+	if(alarm)
+		icon_state = "fdiffuser_emergency"
+		return
+	if((stat & (NOPOWER | BROKEN)) || !enabled)
+		icon_state = "fdiffuser_off"
+	else
+		icon_state = "fdiffuser_on"
+
+/obj/machinery/shield_diffuser/attack_hand()
+	if(alarm)
+		to_chat(usr, "You press an override button on \the [src], re-enabling it.")
+		alarm = 0
+		update_icon()
+		return
+	enabled = !enabled
+	use_power = enabled + 1
+	update_icon()
+	to_chat(usr, "You turn \the [src] [enabled ? "on" : "off"].")
+
+/obj/machinery/shield_diffuser/proc/meteor_alarm(var/duration)
+	if(!duration)
+		return
+	alarm = round(max(alarm, duration))
+	update_icon()
+
+/obj/machinery/shield_diffuser/examine(var/mob/user)
+	. = ..()
+	to_chat(user, "It is [enabled ? "enabled" : "disabled"].")
+	if(alarm)
+		to_chat(user, "A red LED labeled \"Proximity Alarm\" is blinking on the control panel.")