Make health bars show rough percentage of max hp (#9)

.luacheckrc

@@ -21,6 +21,11 @@ stds.minetest = {
 				"copy",
 			},
 		},
+		math = {
+			fields = {
+				"round",
+			},
+		}
 	}
 }
 

init.lua

@@ -11,8 +11,10 @@ end
 -- Localize this functions for better performance,
 -- as it's called on every step
 local vector_distance = vector.distance
-local min = math.min
-local max_breath = minetest.PLAYER_MAX_BREATH_DEFAULT or 11
+local max = {
+	breath = 11,
+	hp = 20,
+}
 
 local mt_5 = minetest.features.object_independent_selectionbox
 
@@ -29,6 +31,14 @@ local function add_gauge(player)
 	end
 end
 
+-- credit: https://github.com/minetest/minetest/blob/6de8d77e17017cd5cc7b065d42566b6b1cd076cc/builtin/game/statbars.lua#L30-L37
+local function scaleToDefault(player, field)
+	-- Scale "hp" or "breath" to supported amount
+	local current = player["get_" .. field](player)
+	local max_display = math.max(player:get_properties()[field .. "_max"], current)
+	return math.round(current / max_display * max[field])
+end
+
 minetest.register_entity("gauges:hp_bar", {
 	visual = "sprite",
 	visual_size = {x=1, y=1/16, z=1},
@@ -50,8 +60,8 @@ minetest.register_entity("gauges:hp_bar", {
 			return
 		end
 
-		local hp = min(player:get_hp(), 20)
-		local breath = min(player:get_breath(), max_breath)
+		local hp = scaleToDefault(player, "hp")
+		local breath = scaleToDefault(player, "breath")
 
 		if self.hp ~= hp or self.breath ~= breath then
 			local health_t = "health_"..hp..".png"
@@ -61,7 +71,7 @@ minetest.register_entity("gauges:hp_bar", {
 				health_t = "blank.png"
 			end
 
-			if breath == max_breath then
+			if breath == max.breath then
 				breath_t = "blank.png"
 			end