Add right-to-left statbars, for hunger and air.

mods/HUD/hudbars/API.md

@@ -45,7 +45,7 @@ a vertical gradient.
 ### Icon
 A 16×16 image shown left of the HUD bar. This is optional.
 
-### `hb.register_hudbar(identifier, text_color, label, textures, default_start_value, default_start_max, default_start_hidden, format_string, format_string_config)`
+### `hb.register_hudbar(identifier, text_color, label, textures, direction, default_start_value, default_start_max, default_start_hidden, format_string, format_string_config)`
 This function registers a new custom HUD bar definition to the HUD bars mod, so it can be later used to be displayed, changed, hidden
 and unhidden on a per-player basis.
 Note this does not yet display the HUD bar.
@@ -63,6 +63,7 @@ for more information.
  * `bar`: The file name of the bar image (as string). This is only used for the `progress_bar` bar type (see `README.txt`, settings section).
  * `icon`: The file name of the icon, as string. For the `progress_bar` type, it is shown as single image left of the bar, for the two statbar bar types, it is used as the statbar icon and will be repeated. This field can be `nil`, in which case no icon will be used, but this is not recommended, because the HUD bar will be invisible if the one of the statbar bar types is used.
  * `bgicon`: The file name of the background icon, it is used as the background for the modern statbar mode only. This field can be `nil`, in which case no background icon will be displayed in this mode.
+* `direction`: Either left to right(0), or right to left(1).
 * `default_start_value`: If this HUD bar is added to a player, and no initial value is specified, this value will be used as initial current value
 * `default_max_value`: If this HUD bar is added to a player, and no initial maximum value is specified, this value will be used as initial maximum value
 * `default_start_hidden`: The HUD bar will be initially start hidden by default when added to a player. Use `hb.unhide_hudbar` to unhide it.

mods/HUD/hudbars/init.lua

@@ -124,7 +124,7 @@ function hb.get_hudbar_position_index(identifier)
 	end
 end
 
-function hb.register_hudbar(identifier, text_color, label, textures, default_start_value, default_start_max, default_start_hidden, format_string, format_string_config)
+function hb.register_hudbar(identifier, text_color, label, textures, direction, default_start_value, default_start_max, default_start_hidden, format_string, format_string_config)
 	minetest.log("action", "hb.register_hudbar: "..tostring(identifier))
 	local hudtable = {}
 	local pos, offset
@@ -133,30 +133,33 @@ function hb.register_hudbar(identifier, text_color, label, textures, default_sta
 	if hb.settings.alignment_pattern == "stack_up" then
 		pos = hb.settings.pos_left
 		offset = {
-			x = hb.settings.start_offset_left.x,
+			x = direction == 0 and hb.settings.start_offset_left.x or -hb.settings.start_offset_right.x,
 			y = hb.settings.start_offset_left.y - hb.settings.vmargin * index
 		}
 	elseif hb.settings.alignment_pattern == "stack_down" then
 		pos = hb.settings.pos_left
 		offset = {
-			x = hb.settings.start_offset_left.x,
+			x = direction == 0 and hb.settings.start_offset_right.x or -hb.settings.start_offset_left.x,
 			y = hb.settings.start_offset_left.y + hb.settings.vmargin * index
 		}
-	else
+	else -- zigzag
 		if index % 2 == 0 then
 			pos = hb.settings.pos_left
 			offset = {
-				x = hb.settings.start_offset_left.x,
+				-- -(24+18) = -42. using linear eq, -42 = -258m - 24.
+				x = direction == 0 and hb.settings.start_offset_left.x or (-42+24)/(-258.0) * hb.settings.start_offset_left.x - 24,
 				y = hb.settings.start_offset_left.y - hb.settings.vmargin * (index/2)
 			}
 		else
 			pos = hb.settings.pos_right
 			offset = {
-				x = hb.settings.start_offset_right.x,
+				-- 24*10+30 - 24 = 234. using linear eq, 234 = 16m - 24.
+				x = direction == 0 and hb.settings.start_offset_right.x or (234+24)/(16) * hb.settings.start_offset_right.x - 24,
 				y = hb.settings.start_offset_right.y - hb.settings.vmargin * ((index-1)/2)
 			}
 		end
 	end
+
 	if format_string == nil then
 		format_string = N("@1: @2/@3")
 	end
@@ -181,6 +184,7 @@ function hb.register_hudbar(identifier, text_color, label, textures, default_sta
 		local state = {}
 		local name = player:get_player_name()
 		local bgscale, iconscale, text, barnumber, bgiconnumber
+
 		if start_max == 0 or start_hidden then
 			bgscale = { x=0, y=0 }
 		else
@@ -197,6 +201,7 @@ function hb.register_hudbar(identifier, text_color, label, textures, default_sta
 			bgiconnumber = hb.settings.statbar_length
 			text = make_label(format_string, format_string_config, label, start_value, start_max)
 		end
+
 		if hb.settings.bar_type == "progress_bar" then
 			ids.bg = player:hud_add({
 				hud_elem_type = "image",
@@ -219,6 +224,7 @@ function hb.register_hudbar(identifier, text_color, label, textures, default_sta
 				})
 			end
 		end
+
 		local bar_image, bgicon, bar_size
 		if hb.settings.bar_type == "progress_bar" then
 			bar_image = textures.bar
@@ -234,10 +240,12 @@ function hb.register_hudbar(identifier, text_color, label, textures, default_sta
 			bgicon = textures.bgicon
 			bar_size = {x=24, y=24}
 		end
+
 		local text2
 		if hb.settings.bar_type == "statbar_modern" then
 			text2 = bgicon
 		end
+
 		ids.bar = player:hud_add({
 			hud_elem_type = "statbar",
 			position = pos,
@@ -247,7 +255,7 @@ function hb.register_hudbar(identifier, text_color, label, textures, default_sta
 			item = bgiconnumber,
 			alignment = {x=-1,y=-1},
 			offset = offset,
-			direction = 0,
+			direction = direction,
 			size = bar_size,
 			z_index = 1,
 		})
@@ -258,7 +266,7 @@ function hb.register_hudbar(identifier, text_color, label, textures, default_sta
 				text = text,
 				alignment = {x=1,y=1},
 				number = text_color,
-				direction = 0,
+				direction = direction,
 				offset = { x = offset.x + 2,  y = offset.y - 1},
 				z_index = 2,
 		})
@@ -359,6 +367,7 @@ function hb.change_hudbar(player, identifier, new_value, new_max_value, new_icon
 		if new_text_color ~= nil then
 			player:hud_change(hudtable.hudids[name].text, "number", new_text_color)
 		end
+
 	else
 		if new_icon ~= nil and hudtable.hudids[name].bar ~= nil then
 			player:hud_change(hudtable.hudids[name].bar, "text", new_icon)
@@ -474,8 +483,8 @@ end
 
 --register built-in HUD bars
 if minetest.settings:get_bool("enable_damage") or hb.settings.forceload_default_hudbars then
-	hb.register_hudbar("health", 0xFFFFFF, S("Health"), { bar = "hudbars_bar_health.png", icon = "hudbars_icon_health.png", bgicon = "hudbars_bgicon_health.png" }, 20, 20, false)
+	hb.register_hudbar("health", 0xFFFFFF, S("Health"), { bar = "hudbars_bar_health.png", icon = "hudbars_icon_health.png", bgicon = "hudbars_bgicon_health.png" }, 0, 20, 20, false)
-	hb.register_hudbar("breath", 0xFFFFFF, S("Breath"), { bar = "hudbars_bar_breath.png", icon = "hudbars_icon_breath.png", bgicon = "hudbars_bgicon_breath.png" }, 10, 10, true)
+	hb.register_hudbar("breath", 0xFFFFFF, S("Breath"), { bar = "hudbars_bar_breath.png", icon = "hudbars_icon_breath.png", bgicon = "hudbars_bgicon_breath.png" }, 1, 10, 10, true)
 end
 
 local function hide_builtin(player)

mods/HUD/mcl_hbarmor/init.lua

@@ -57,7 +57,7 @@ local function custom_hud(player)
 end
 
 --register and define armor HUD bar
-hb.register_hudbar("armor", 0xFFFFFF, S("Armor"), { icon = "hbarmor_icon.png", bgicon = "hbarmor_bgicon.png", bar = "hbarmor_bar.png" }, 0, 20, mcl_hbarmor.autohide)
+hb.register_hudbar("armor", 0xFFFFFF, S("Armor"), { icon = "hbarmor_icon.png", bgicon = "hbarmor_bgicon.png", bar = "hbarmor_bar.png" }, 0, 0, 20, mcl_hbarmor.autohide)
 
 function mcl_hbarmor.get_armor(player)
 	if not player or not armor.def then

mods/PLAYER/mcl_hunger/init.lua

@@ -89,10 +89,10 @@ function mcl_hunger.update_exhaustion_hud(player, exhaustion)
 end
 
 -- register saturation hudbar
-hb.register_hudbar("hunger", 0xFFFFFF, S("Food"), { icon = "hbhunger_icon.png", bgicon = "hbhunger_bgicon.png",  bar = "hbhunger_bar.png" }, 20, 20, false)
+hb.register_hudbar("hunger", 0xFFFFFF, S("Food"), { icon = "hbhunger_icon.png", bgicon = "hbhunger_bgicon.png",  bar = "hbhunger_bar.png" }, 1, 20, 20, false)
 if mcl_hunger.debug then
-	hb.register_hudbar("saturation", 0xFFFFFF, S("Saturation"), { icon = "mcl_hunger_icon_saturation.png", bgicon = "mcl_hunger_bgicon_saturation.png", bar = "mcl_hunger_bar_saturation.png" }, mcl_hunger.SATURATION_INIT, 200, false, S("%s: %.1f/%d"))
+	hb.register_hudbar("saturation", 0xFFFFFF, S("Saturation"), { icon = "mcl_hunger_icon_saturation.png", bgicon = "mcl_hunger_bgicon_saturation.png", bar = "mcl_hunger_bar_saturation.png" }, 1, mcl_hunger.SATURATION_INIT, 200, false, S("%s: %.1f/%d"))
-	hb.register_hudbar("exhaustion", 0xFFFFFF, S("Exhaust."), { icon = "mcl_hunger_icon_exhaustion.png", bgicon = "mcl_hunger_bgicon_exhaustion.png", bar = "mcl_hunger_bar_exhaustion.png" }, 0, mcl_hunger.EXHAUST_LVL, false, S("%s: %d/%d"))
+	hb.register_hudbar("exhaustion", 0xFFFFFF, S("Exhaust."), { icon = "mcl_hunger_icon_exhaustion.png", bgicon = "mcl_hunger_bgicon_exhaustion.png", bar = "mcl_hunger_bar_exhaustion.png" }, 1, 0, mcl_hunger.EXHAUST_LVL, false, S("%s: %d/%d"))
 end
 
 minetest.register_on_joinplayer(function(player)