Fix precision not working in hud_change (#10186)

games/devtest/mods/util_commands/init.lua

@@ -112,6 +112,62 @@ minetest.register_chatcommand("detach", {
 	end,
 })
 
+-- Use this to test waypoint capabilities
+minetest.register_chatcommand("test_waypoints", {
+	params = "[change_immediate]",
+	description = "tests waypoint capabilities",
+	func = function(name, params)
+		local player = minetest.get_player_by_name(name)
+		local regular = player:hud_add {
+			hud_elem_type = "waypoint",
+			name = "regular waypoint",
+			text = "m",
+			number = 0xFF0000,
+			world_pos = vector.add(player:get_pos(), {x = 0, y = 1.5, z = 0})
+		}
+		local reduced_precision = player:hud_add {
+			hud_elem_type = "waypoint",
+			name = "better waypoint",
+			text = "m (0.5 steps, precision = 2)",
+			precision = 10,
+			number = 0xFFFF00,
+			world_pos = vector.add(player:get_pos(), {x = 0, y = 1, z = 0})
+		}
+		local function change()
+			if regular then
+				player:hud_change(regular, "world_pos", vector.add(player:get_pos(), {x = 0, y = 3, z = 0}))
+			end
+			if reduced_precision then
+				player:hud_change(reduced_precision, "precision", 2)
+			end
+		end
+		if params ~= "" then
+			-- change immediate
+			change()
+		else
+			minetest.after(0.5, change)
+		end
+		regular = regular or "error"
+		reduced_precision = reduced_precision or "error"
+		local hidden_distance = player:hud_add {
+			hud_elem_type = "waypoint",
+			name = "waypoint with hidden distance",
+			text = "this text is hidden as well (precision = 0)",
+			precision = 0,
+			number = 0x0000FF,
+			world_pos = vector.add(player:get_pos(), {x = 0, y = 0.5, z = 0})
+		} or "error"
+		local image_waypoint = player:hud_add {
+			hud_elem_type = "image_waypoint",
+			text = "wieldhand.png",
+			world_pos = player:get_pos(),
+			scale = {x = 10, y = 10},
+			offset = {x = 0, y = -32}
+		} or "error"
+		minetest.chat_send_player(name, "Waypoint IDs: regular: " .. regular .. ", reduced precision: " .. reduced_precision ..
+			", hidden distance: " .. hidden_distance .. ", image waypoint: " .. image_waypoint)
+	end
+})
 
 -- Unlimited node placement
 minetest.register_on_placenode(function(pos, newnode, placer, oldnode, itemstack)

src/hud.cpp

@@ -40,6 +40,7 @@ const struct EnumString es_HudElementStat[] =
 	{HUD_STAT_TEXT,   "text"},
 	{HUD_STAT_NUMBER, "number"},
 	{HUD_STAT_ITEM,   "item"},
+	{HUD_STAT_ITEM,   "precision"},
 	{HUD_STAT_DIR,    "direction"},
 	{HUD_STAT_ALIGN,  "alignment"},
 	{HUD_STAT_OFFSET, "offset"},

src/script/common/c_content.cpp

@@ -1959,9 +1959,10 @@ void push_hud_element(lua_State *L, HudElement *elem)
 HudElementStat read_hud_change(lua_State *L, HudElement *elem, void **value)
 {
 	HudElementStat stat = HUD_STAT_NUMBER;
+	std::string statstr;
 	if (lua_isstring(L, 3)) {
 		int statint;
-		std::string statstr = lua_tostring(L, 3);
+		statstr = lua_tostring(L, 3);
 		stat = string_to_enum(es_HudElementStat, statint, statstr) ?
 				(HudElementStat)statint : stat;
 	}
@@ -1989,6 +1990,8 @@ HudElementStat read_hud_change(lua_State *L, HudElement *elem, void **value)
 			break;
 		case HUD_STAT_ITEM:
 			elem->item = luaL_checknumber(L, 4);
+			if (elem->type == HUD_ELEM_WAYPOINT && statstr == "precision")
+				elem->item++;
 			*value = &elem->item;
 			break;
 		case HUD_STAT_DIR: