Send statbar values only to client when changed

init.lua

@@ -1,10 +1,17 @@
 hud = {}
 
-local health_hud = {}
+-- HUD statbar values
+hud.health = {}
 hud.hunger = {}
+hud.air = {}
+hud.armor = {}
+hud.hunger_out = {}
+hud.armor_out = {}
+
+-- HUD item ids
+local health_hud = {}
 local hunger_hud = {}
 local air_hud = {}
-hud.armor = {}
 local armor_hud = {}
 
 local SAVE_INTERVAL = 0.5*60--currently useless
@@ -129,7 +136,7 @@ local function costum_hud(player)
 
 end
 
---needs to be set always(for 3darmor)
+--needs to be defined for older version of 3darmor
 function hud.set_armor()
 end
 
@@ -137,22 +144,42 @@ end
 if HUD_ENABLE_HUNGER then dofile(minetest.get_modpath("hud").."/hunger.lua") end
 if HUD_SHOW_ARMOR then dofile(minetest.get_modpath("hud").."/armor.lua") end
 
-
+-- update hud elemtens if value has changed
 local function update_hud(player)
+	local name = player:get_player_name()
  --air
-	local air = player:get_breath()*2
+	local air = tonumber(hud.air[name])
-	if player:get_breath() > 10 then air = 0 end
+	if player:get_breath() ~= air then
-	player:hud_change(air_hud[player:get_player_name()], "number", air)
+		air = player:get_breath()
+		hud.air[name] = air
+		if air > 10 then air = 0 end
+		player:hud_change(air_hud[name], "number", air*2)
+	end
  --health
-	player:hud_change(health_hud[player:get_player_name()], "number", player:get_hp())
+	local hp = tonumber(hud.health[name])
+	if player:get_hp() ~= hp then
+		hp = player:get_hp()
+		hud.health[name] = hp
+		player:hud_change(health_hud[name], "number", hp)
+	end
  --armor
-	local arm = tonumber(hud.armor[player:get_player_name()])
+	local arm_out = tonumber(hud.armor_out[name])
+	if not arm_out then arm_out = 0 end
+	local arm = tonumber(hud.armor[name])
 	if not arm then arm = 0 end
-	player:hud_change(armor_hud[player:get_player_name()], "number", arm)
+	if arm_out ~= arm then
+		hud.armor_out[name] = arm
+		player:hud_change(armor_hud[name], "number", arm)
+	end
  --hunger
-	local h = tonumber(hud.hunger[player:get_player_name()])
+	local h_out = tonumber(hud.hunger_out[name])
-	if h>20 then h=20 end
+	local h = tonumber(hud.hunger[name])
-	player:hud_change(hunger_hud[player:get_player_name()], "number", h)
+	if h_out ~= h then
+		hud.hunger_out[name] = h
+		-- bar should not have more than 10 icons
+		if h>20 then h=20 end
+		player:hud_change(hunger_hud[name], "number", h)
+	end
 end
 
 local function timer(interval, player)
@@ -163,11 +190,17 @@ local function timer(interval, player)
 end
 
 minetest.register_on_joinplayer(function(player)
-	hud.armor[player:get_player_name()] = 0
+	local name = player:get_player_name()
-	if HUD_ENABLE_HUNGER then hud.hunger[player:get_player_name()] = hud.load_hunger(player) end
+	hud.health[name] = player:get_hp()
-	if not hud.hunger[player:get_player_name()] then
+	local air = player:get_breath()
-		hud.hunger[player:get_player_name()] = 20
+	hud.air[name] = air
+	if HUD_ENABLE_HUNGER then hud.hunger[name] = hud.load_hunger(player) end
+	if not hud.hunger[name] then
+		hud.hunger[name] = 20
 	end
+	hud.hunger_out[name] = hud.hunger[name]
+	hud.armor[name] = 0
+	hud.armor_out[name] = 0
 	minetest.after(0.5, function()
 		hide_builtin(player)
 		costum_hud(player)
@@ -189,27 +222,38 @@ minetest.after(2.5, function()
 	 timer = timer + dtime
 	 timer2 = timer2 + dtime
 		for _,player in ipairs(minetest.get_connected_players()) do
+			local name = player:get_player_name()
+
+			-- only proceed if damage is enabled
 			if minetest.setting_getbool("enable_damage") then
-			 local h = tonumber(hud.hunger[player:get_player_name()])
+			 local h = tonumber(hud.hunger[name])
+			 local hp = player:get_hp()
 			 if HUD_ENABLE_HUNGER and timer > 4 then
-				if h>=16 and player:get_hp() > 0 then
+				-- heal player by 1 hp if not dead and saturation is > 15 (of 30)
-					player:set_hp(player:get_hp()+1)
+				if h > 15 and hp > 0 then
-				elseif h<=1 and minetest.setting_getbool("enable_damage") then
+					player:set_hp(hp+1)
-					if player:get_hp()-1 >= 1 then player:set_hp(player:get_hp()-1) end
+				-- or damage player by 1 hp if saturation is < 2 (of 30) and player would not die
+				elseif h <= 1 and minetest.setting_getbool("enable_damage") then
+					if hp-1 >= 1 then player:set_hp(hp-1) end
 				end
 			 end
-			 if HUD_ENABLE_HUNGER and timer2>HUD_HUNGER_TICK then
+			 -- lower saturation by 1 point after xx seconds
-				if h>1 then
+			 if HUD_ENABLE_HUNGER and timer2 > HUD_HUNGER_TICK then
-					h=h-1
+				if h > 1 then
-					hud.hunger[player:get_player_name()]=h
+					h = h-1
+					hud.hunger[name] = h
 					hud.save_hunger(player)
 				end
 			 end
+			 -- update current armor level
 			 if HUD_SHOW_ARMOR then hud.get_armor(player) end
+
+			 -- update all hud elements
 			 update_hud(player)
 			end
 		end
-		if timer>4 then timer=0 end
+		
-		if timer2>HUD_HUNGER_TICK then timer2=0 end
+		if timer > 4 then timer = 0 end
+		if timer2 > HUD_HUNGER_TICK then timer2 = 0 end
 	end)
 end)