Radio Jammers (#502)

Adds radio jammers for antags and improvised version as well.

code/game/objects/items/devices/PDA/PDA.dm

@@ -973,7 +973,7 @@ var/global/list/obj/item/device/pda/PDAs = list()
 	t = reception.message
 
 	if(reception.message_server && (reception.telecomms_reception & TELECOMMS_RECEPTION_SENDER)) // only send the message if it's stable
-		if(reception.telecomms_reception & TELECOMMS_RECEPTION_RECEIVER == 0) // Does our recipient have a broadcaster on their level?
+		if(!(reception.telecomms_reception & TELECOMMS_RECEPTION_RECEIVER)) // Does our recipient have a broadcaster on their level?
 			U << "ERROR: Cannot reach recipient."
 			return
 		var/send_result = reception.message_server.send_pda_message("[P.owner]","[owner]","[t]")

code/game/objects/items/devices/radio/radio.dm

@@ -292,6 +292,9 @@
   /* ###### Radio headsets can only broadcast through subspace ###### */
 
 	if(subspace_transmission)
+		// Check for jamming.
+		if (within_jamming_range(src))
+			return
 		// First, we want to generate a new radio signal
 		var/datum/signal/signal = new
 		signal.transmission_method = 2 // 2 would be a subspace transmission.
@@ -434,6 +437,8 @@
 		return -1
 	if(!listening)
 		return -1
+	if (within_jamming_range(src))
+		return -1
 	if(!(0 in level))
 		var/turf/position = get_turf(src)
 		if(!position || !(position.z in level))
@@ -652,4 +657,4 @@
 	return
 
 /obj/item/device/radio/off
-	listening = 0
+	listening = 0

code/game/objects/items/devices/radio_jammer.dm

@@ -0,0 +1,130 @@
+//Global list for housing active radiojammers:
+var/list/active_radio_jammers = list()
+
+proc/within_jamming_range(var/atom/test) // tests if an object is near a radio jammer
+	if (active_radio_jammers && active_radio_jammers.len)
+		for (var/obj/item/device/radiojammer/Jammer in active_radio_jammers)
+			if (get_dist(test, Jammer) <= Jammer.radius)
+				return 1
+
+	return 0
+
+/obj/item/device/radiojammer
+	name = "radio jammer"
+	desc = "A small, inconspicious looking item with an 'ON/OFF' toggle."
+	icon = 'icons/obj/device.dmi'
+	icon_state = "shield0"
+	w_class = 2
+
+	var/active = 0
+	var/radius = 7
+	var/icon_state_active = "shield1"
+	var/icon_state_inactive = "shield0"
+
+/obj/item/device/radiojammer/New()
+	..()
+	update()
+
+/obj/item/device/radiojammer/Destroy()
+	if (active)
+		active_radio_jammers -= src
+	..()
+
+
+/obj/item/device/radiojammer/attack_self()
+	toggle()
+
+
+/obj/item/device/radiojammer/emp_act()
+	toggle()
+
+
+/obj/item/device/radiojammer/proc/toggle()
+	if (active)
+		usr << "<span class='notice'>You deactivate \the [src].</span>"
+	else
+		usr << "<span class='notice'>You activate \the [src].</span>"
+	set_active(!active)
+
+
+/obj/item/device/radiojammer/proc/set_active(var/new_value)
+	active = new_value
+	update()
+
+
+/obj/item/device/radiojammer/proc/update()
+	if (active)
+		active_radio_jammers += src
+		icon_state = icon_state_active
+	else
+		active_radio_jammers -= src
+		icon_state = icon_state_inactive
+
+
+/obj/item/device/radiojammer/improvised
+	name = "improvised radio jammer"
+	desc = "An awkward bundle of wires, batteries, and radio transmitters."
+	var/obj/item/weapon/cell/cell
+	var/obj/item/device/assembly_holder/assembly_holder
+	// 10 seconds of operation on a standard cell. 200 (roughly 3 minutes) on a super cap.
+	var/power_drain_per_second = 100
+	var/last_updated = null
+	radius = 5
+	icon = 'icons/obj/assemblies/new_assemblies.dmi'
+	icon_state_active = "improvised_jammer_active"
+	icon_state_inactive = "improvised_jammer_inactive"
+
+
+/obj/item/device/radiojammer/improvised/New(var/obj/item/device/assembly_holder/incoming_holder, var/obj/item/weapon/cell/incoming_cell, var/mob/user)
+	..()
+	cell = incoming_cell
+	assembly_holder = incoming_holder
+
+	// Spawn() required to properly move the assembly. Why? No clue!
+	// This does not make any sense, but sure.
+	spawn(0)
+		incoming_holder.forceMove(src, 1)
+		incoming_cell.forceMove(src, 1)
+
+	user.put_in_active_hand(src)
+
+/obj/item/device/radiojammer/improvised/Destroy()
+	if (active)
+		processing_objects.Remove(src)
+	..()
+
+
+/obj/item/device/radiojammer/improvised/process()
+	var/current = world.time // current tick
+	var/delta = (current - last_updated) / 10.0 // delta in seconds
+	last_updated = current
+	if (!cell.use(delta * power_drain_per_second))
+		set_active(0)
+		cell.charge = 0 // drain the last of the battery
+
+
+/obj/item/device/radiojammer/improvised/attackby(obj/item/weapon/W as obj, mob/user as mob)
+	if (istype(W, /obj/item/weapon/screwdriver))
+		user << "<span class='notice'>You disassemble the improvised signal jammer.</span>"
+		user.put_in_hands(assembly_holder)
+		user.put_in_hands(cell)
+		qdel(src)
+
+/obj/item/device/radiojammer/improvised/set_active(var/new_value)
+	if (new_value == 1)
+		if (!cell || !cell.charge)
+			return
+
+	..()
+
+/obj/item/device/radiojammer/improvised/update()
+	if (active)
+		active_radio_jammers += src
+		icon_state = icon_state_active
+		processing_objects.Add(src)
+
+		last_updated = world.time
+	else
+		active_radio_jammers -= src
+		icon_state = icon_state_inactive
+		processing_objects.Remove(src)