minetest_hudbars/init.lua

hud = {}

-- HUD statbar values
hud.health = {}
hud.air = {}

-- HUD item ids
local health_hud = {}
local air_hud = {}

-- default settings

HUD_SCALEABLE = false
HUD_BARLENGTH = 160

 -- statbar positions
HUD_HEALTH_POS = {x=0.5,y=0.9}
HUD_HEALTH_OFFSET = {x=-175, y=2}
HUD_AIR_POS = {x=0.5,y=0.9}
HUD_AIR_OFFSET = {x=15,y=2}

-- dirty way to check for new statbars
if dump(minetest.hud_replace_builtin) ~= "nil" then
	HUD_SCALEABLE = true
	HUD_HEALTH_POS = {x=0.5,y=1}
	HUD_HEALTH_OFFSET = {x=-262, y=-87}
	HUD_AIR_POS = {x=0.5,y=1}
	HUD_AIR_OFFSET = {x=15,y=-87}
end

HUD_TICK = 0.1

function hud.value_to_barlength(value, max)
	return math.ceil((value/max) * HUD_BARLENGTH)
end

--load custom settings
local set = io.open(minetest.get_modpath("hudbars").."/hud.conf", "r")
if set then 
	dofile(minetest.get_modpath("hudbars").."/hud.conf")
	set:close()
end

local function hide_builtin(player)
	 player:hud_set_flags({crosshair = true, hotbar = true, healthbar = false, wielditem = true, breathbar = false})
end


local function custom_hud(player)
 local name = player:get_player_name()

 if minetest.setting_getbool("enable_damage") then
 --health
	player:hud_add({
		hud_elem_type = "image",
		position = HUD_HEALTH_POS,
		scale = { x = 1, y = 1 },
		text = "hudbars_bar_background.png",
		alignment = {x=1,y=1},
		offset = { x = HUD_HEALTH_OFFSET.x - 1, y = HUD_HEALTH_OFFSET.y - 1 },
	})
	health_hud[name] = player:hud_add({
		hud_elem_type = "statbar",
		position = HUD_HEALTH_POS,
		text = "hudbars_bar_health.png",
		number = hud.value_to_barlength(player:get_hp(), 20),
		alignment = {x=-1,y=-1},
		offset = HUD_HEALTH_OFFSET,
	})

 --air
	player:hud_add({
		hud_elem_type = "image",
		position = HUD_AIR_POS,
		scale = { x = 1, y = 1 },
		text = "hudbars_bar_background.png",
		alignment = {x=1,y=1},
		offset = { x = HUD_AIR_OFFSET.x - 1, y = HUD_AIR_OFFSET.y - 1 },
	})
	air_hud[name] = player:hud_add({
		hud_elem_type = "statbar",
		position = HUD_AIR_POS,
		text = "hudbars_bar_breath.png",
		number = hud.value_to_barlength(math.min(player:get_breath(), 10), 10),
		alignment = {x=-1,y=-1},
		offset = HUD_AIR_OFFSET,
	})

 end
end


-- update hud elemtens if value has changed
local function update_hud(player)
	local name = player:get_player_name()
 --air
	local air = tonumber(hud.air[name])
	if player:get_breath() ~= air then
		air = player:get_breath()
		hud.air[name] = air
		player:hud_change(air_hud[name], "number", hud.value_to_barlength(math.min(air, 10), 10))
	end
 --health
	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", hud.value_to_barlength(hp, 20))
	end
end

minetest.register_on_joinplayer(function(player)
	local name = player:get_player_name()
	local inv = player:get_inventory()
	hud.health[name] = player:get_hp()
	local air = player:get_breath()
	hud.air[name] = air
	minetest.after(0.5, function()
		hide_builtin(player)
		custom_hud(player)
	end)
end)

local main_timer = 0
local timer = 0
local timer2 = 0
minetest.after(2.5, function()
	minetest.register_globalstep(function(dtime)
	 main_timer = main_timer + dtime
	 timer = timer + dtime
	 timer2 = timer2 + dtime
		if main_timer > HUD_TICK or timer > 4 then
		 if main_timer > HUD_TICK then main_timer = 0 end
		 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 hp = player:get_hp()

			 -- update all hud elements
			 update_hud(player)
			
			end
		 end
		
		end
		if timer > 4 then timer = 0 end
	end)
end)