Switch around loops to be a bit more efficient

MT keeps adding new inputs like zoom and now analog movement input.
We need to assume that newly added inputs don't block autotrek from
working, rather than blocking it, or else some additions like the
analog inputs prevent it from ever working.

.cdbrelease.lua

@@ -30,8 +30,8 @@ return {
 	repo = "https://gitlab.com/sztest/autotrek",
 	long_description = readtext('README.md'),
 	screenshots = {
-		readbinary('.cdb-screen1.jpg'),
+		readbinary('.cdb-screen1.webp'),
-		readbinary('.cdb-screen2.jpg'),
+		readbinary('.cdb-screen2.webp'),
 	}
 }
 

README.md

@@ -8,6 +8,10 @@ AutoTrek supports the **4 cardinal directions** (North, South, East, West) and t
 
 Pick one of the supported directions and **walk continuously forward** for a few seconds.  You will see a HUD appear with the AutoTrek icon.  If you **point directly at this HUD** for a second or so, you will "lock in" your travel direction, and AutoTrek will make fine adjustments to your direction and position to keep you centered on your path (terrain allowing).
 
+While locked in to a travel direction, players will automatically **swim/climb upward** as necessary to stay afloat and clear simple obstacles such as shores.
+
+Beware that when traveling diagonally, the player may experience "friction" against the edges of nodes that can push them off course, and the course correction may not always be enough to put the player back on the original path; they can end up on a path alongside the original.  You should carefully plan and modify diagonal paths for best reliability.
+
 ### Automatic Turns
 
 When a player is "locked in" to a travel direction, certain structures, when detected, will cause the player to turn automatically and lock in another path 90 or 45 degrees from the previous one.

init.lua

@@ -66,6 +66,7 @@ do
 	minetest.register_on_leaveplayer(function(player)
 			hudstate[player:get_player_name()] = nil
 		end)
+	local hud_elem_type = minetest.features.hud_def_type_field and "type" or "hud_elem_type"
 	hudset = function(player, pos, opacity)
 		local pname = player:get_player_name()
 		local state = hudstate[pname]
@@ -77,7 +78,7 @@ do
 			local img = "autotrek_hud.png^[opacity:" .. (opacity or 255)
 			if not state.id then
 				state.id = player:hud_add({
-						hud_elem_type = "image_waypoint",
+						[hud_elem_type] = "image_waypoint",
 						world_pos = pos,
 						text = img,
 						scale = {x = 0.5, y = 0.5},
@@ -108,19 +109,33 @@ end
 ------------------------------------------------------------------------
 -- PARTICLE EFFECTS
 
-local function particles(pname, vpos, vel)
+local oldparticles = {}
-	local pos = vector.add(vpos, vel)
+
-	minetest.add_particlespawner({
+local function particles(player, pname, speed)
+	pname = pname or player:get_player_name()
+	speed = speed or vector.length(player:get_velocity())
+
+	local old = oldparticles[pname]
+	if old then
+		minetest.delete_particlespawner(old, pname)
+		oldparticles[pname] = nil
+	end
+
+	if speed < 2 then return end
+
+	local height = player:get_properties().eye_height
+	oldparticles[pname] = minetest.add_particlespawner({
 			amount = 20,
 			time = 2,
 			size = 1/8,
-			expirationtime = 2,
+			expirationtime = 1,
 			texture = "autotrek_particle.png",
 			playername = pname,
+			attached = player,
 			glow = 14,
-			minpos = vector.add(pos, vector.new(-1, -1, -1)),
+			minpos = vector.new(-1, height - 1, 0),
-			maxpos = vector.add(pos, vector.new(1, 1, 1)),
+			maxpos = vector.new(1, height + 1, speed),
-			acceleration = vector.multiply(vel, 0.5),
+			acceleration = vector.new(0, 0, -speed),
 		})
 end
 
@@ -195,7 +210,14 @@ end
 ------------------------------------------------------------------------
 -- PATH CORRECTION
 
-local function pathcorrect(player, ppos, bestv)
+local function isswimmable(pos)
+	local node = minetest.get_node(pos)
+	local def = minetest.registered_nodes[node.name] or {}
+	return def.climbable or def.liquid_move_physics or def.liquidtype ~= "none"
+end
+
+local vzero = vector.new(0, 0, 0)
+local function pathcorrect(player, ppos, bestv, swimcheck)
 	-- If the player's yaw is not exact enough, then
 	-- snap it to the exact direction. We have to
 	-- allow for some floating point rounding error here
@@ -206,6 +228,17 @@ local function pathcorrect(player, ppos, bestv)
 		player:set_look_horizontal(nh)
 	end
 
+	-- Determine if the player needs to or climb up: either
+	-- they are sinking too far into a sinkable/swimmable
+	-- node, or they're in one and the node in front of them
+	-- is one they'd have to climb out for.
+	local addvel = vzero
+	if swimcheck and isswimmable(ppos)
+	and (isswimmable(vector.offset(ppos, 0, 1, 0))
+		or issolid(vector.add(ppos, bestv))) then
+		addvel = vector.new(0, 10, 0)
+	end
+
 	-- Compute how far away from the grid centerline
 	-- the player's path is and nudge them back into
 	-- alignment with the exact centers of nodes.
@@ -215,20 +248,28 @@ local function pathcorrect(player, ppos, bestv)
 	offs = offs / spacing
 	offs = offs - math_floor(offs)
 	if offs > griderr and offs < 0.5 then
-		player:add_velocity(vector.multiply(across, -gridforce))
+		addvel = vector.add(addvel, vector.multiply(across, -gridforce))
 	elseif offs >= 0.5 and offs < 1 - griderr then
-		player:add_velocity(vector.multiply(across, gridforce))
+		addvel = vector.add(addvel, vector.multiply(across, gridforce))
+	end
+
+	if addvel ~= vzero and not vector.equals(addvel, vzero) then
+		player:add_velocity(addvel)
 	end
 end
 
 ------------------------------------------------------------------------
 -- AUTOTREK STATE MACHINE
 
-local allowkeys = {
+local disallowkeys = {
-	up = true,
+	left = true,
-	jump = true,
+	right = true,
+	down = true,
+	dig = true,
+	place = true,
+	LMB = true,
+	RMB = true,
 	sneak = true,
-	aux1 = true,
 }
 
 local pdata = {}
@@ -245,8 +286,8 @@ local function checkplayer(player, dtime)
 	-- seconds, otherwise deactivate
 	local ctl = player:get_player_control()
 	local fwd = ctl.up
-	for k, v in pairs(ctl) do
+	for k in pairs(disallowkeys) do
-		if v and not allowkeys[k] then
+		if ctl[k] then
 			fwd = false
 			break
 		end
@@ -257,9 +298,13 @@ local function checkplayer(player, dtime)
 		while next(data) do
 			data[next(data)] = nil
 		end
+		particles(player, pname, 0)
+		return hudset(player)
+	end
+	if data.runtime < walktime then
+		particles(player, pname, 0)
 		return hudset(player)
 	end
-	if data.runtime < walktime then return hudset(player) end
 
 	-- Figure out which of the [semi-]cardinal directions
 	-- is closest to the one the player is looking at, and
@@ -279,7 +324,7 @@ local function checkplayer(player, dtime)
 	local ppos = player:get_pos()
 	local vpos = vector.offset(ppos, 0, player:get_properties().eye_height, 0)
 	hudset(player, vector.add(vpos, vector.multiply(bestv, huddist)),
-		bestd < lockmin and 32 or 192)
+		bestd < lockmin and 24 or 192)
 
 	-- The player must lock on close enough to the
 	-- exact direction for a little while to activate
@@ -295,7 +340,7 @@ local function checkplayer(player, dtime)
 	-- Draw particles.
 	data.fxtime = (data.fxtime or 0) - dtime
 	if data.fxtime <= 0 then
-		particles(pname, vpos, player:get_velocity())
+		particles(player, pname)
 		data.fxtime = 1
 	end
 
@@ -311,7 +356,13 @@ local function checkplayer(player, dtime)
 	end
 
 	-- Apply path correction if no turns.
-	return pathcorrect(player, ppos, bestv)
+	local swimcheck
+	data.swimtime = (data.swimtime or 0) - dtime
+	if data.swimtime <= 0 then
+		swimcheck = true
+		data.swimtime = 1
+	end
+	return pathcorrect(player, ppos, bestv, swimcheck)
 end
 
 ------------------------------------------------------------------------

src/hud.svg

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