Part 1 of Health Bars for Space Dragon

code/modules/mob/living/living.dm

@@ -543,7 +543,46 @@
 	med_hud_set_health()
 	med_hud_set_status()
 
-//proc used to ressuscitate a mob
+/mob/living/update_health_hud()
+	var/severity = 0
+	var/healthpercent = (health/maxHealth) * 100
+	if(hud_used?.healthdoll) //to really put you in the boots of a simplemob
+		var/obj/screen/healthdoll/living/livingdoll = hud_used.healthdoll
+		switch(healthpercent)
+			if(100 to INFINITY)
+				livingdoll.icon_state = "living0"
+			if(80 to 100)
+				livingdoll.icon_state = "living1"
+				severity = 1
+			if(60 to 80)
+				livingdoll.icon_state = "living2"
+				severity = 2
+			if(40 to 60)
+				livingdoll.icon_state = "living3"
+				severity = 3
+			if(20 to 40)
+				livingdoll.icon_state = "living4"
+				severity = 4
+			if(1 to 20)
+				livingdoll.icon_state = "living5"
+				severity = 5
+			else
+				livingdoll.icon_state = "living6"
+				severity = 6
+		if(!livingdoll.filtered)
+			livingdoll.filtered = TRUE
+			var/icon/mob_mask = icon(icon, icon_state)
+			if(mob_mask.Height() > world.icon_size || mob_mask.Width() > world.icon_size)
+				var/health_doll_icon_state = health_doll_icon ? health_doll_icon : "megasprite"
+				mob_mask = icon('icons/mob/screen_gen.dmi', health_doll_icon_state) //swap to something generic if they have no special doll
+			UNLINT(livingdoll.filters += filter(type="alpha", icon = mob_mask))
+			livingdoll.filters += filter(type="drop_shadow", size = -1)
+	if(severity > 0)
+		overlay_fullscreen("brute", /obj/screen/fullscreen/brute, severity)
+	else
+		clear_fullscreen("brute")
+
+//Proc used to resuscitate a mob, for full_heal see fully_heal()
 /mob/living/proc/revive(full_heal = FALSE, admin_revive = FALSE)
 	SEND_SIGNAL(src, COMSIG_LIVING_REVIVE, full_heal, admin_revive)
 	if(full_heal)

code/modules/mob/living/living_defines.dm

@@ -94,6 +94,7 @@
 	var/smoke_delay = 0 //used to prevent spam with smoke reagent reaction on mob.
 
 	var/bubble_icon = "default" //what icon the mob uses for speechbubbles
+	var/health_doll_icon //if this exists AND the normal sprite is bigger than 32x32, this is the replacement icon state (because health doll size limitations). the icon will always be screen_gen.dmi
 
 	var/last_bumped = 0
 	var/unique_name = 0 //if a mob's name should be appended with an id when created e.g. Mob (666)