updated scripting api a bit

--HG--
rename : data/luaobjects/test/client.lua => data/scripts/objects/test/client.lua
rename : data/luaobjects/test/server.lua => data/scripts/objects/test/server.lua

data/scripts/objects/test/server.lua

@@ -0,0 +1,322 @@
+-- Server-side code of the test lua object
+
+--
+-- Some helper functions and classes
+--
+
+-- For debugging
+function dump(o)
+    if type(o) == 'table' then
+        local s = '{ '
+        for k,v in pairs(o) do
+                if type(k) ~= 'number' then k = '"'..k..'"' end
+                s = s .. '['..k..'] = ' .. dump(v) .. ','
+        end
+        return s .. '} '
+    else
+        return tostring(o)
+    end
+end
+
+function table.copy(t)
+	local t2 = {}
+	for k,v in pairs(t) do
+		t2[k] = v
+	end
+	return t2
+end
+
+function vector_zero()
+	return {X=0,Y=0,Z=0}
+end
+
+function vector_subtract(a, b)
+	return {X=a.X-b.X, Y=a.Y-b.Y, Z=a.Z-b.Z}
+end
+
+function vector_add(a, b)
+	return {X=a.X+b.X, Y=a.Y+b.Y, Z=a.Z+b.Z}
+end
+
+function vector_multiply(a, d)
+	return {X=a.X*d, Y=a.Y*d, Z=a.Z*d}
+end
+
+function vector_copy(a)
+	return {X=a.X, Y=a.Y, Z=a.Z}
+end
+
+function vector_length(a)
+	return math.sqrt(a.X*a.X + a.Y*a.Y + a.Z*a.Z)
+end
+
+function vector_eq(a, b)
+	return (a.X==b.X and a.Y==b.Y and a.Z==b.Z)
+end
+
+function round(num, idp)
+	local mult = 10^(idp or 0)
+	return math.floor(num * mult + 0.5) / mult
+end
+
+function vector_snap(a)
+	return {X=round(a.X, 0), Y=round(a.Y, 0), Z=round(a.Z, 0)}
+end
+
+--
+-- Actual code
+--
+
+CONTENT_STONE = 0
+
+is_digger = false
+counter = 0
+counter2 = 0
+counter3 = 0
+counter4 = 0
+counter_move = 0
+death_counter = 0
+-- This is set in on_initialize()
+position = {X=0,Y=0,Z=0}
+starting_position = {X=0,Y=0,Z=0}
+rotation = {X=0, Y=math.random(0,360), Z=0}
+y_dir = 1
+temp1 = 0
+speed = 1.5
+main_dir = {X=0,Y=0,Z=0}
+
+function dir_goodness(env, pos, dir)
+	if vector_eq(dir, vector_zero()) then
+		return -1
+	end
+	p = vector_add(pos, dir)
+	n = env_get_node(env, p)
+	f = get_content_features(n.content)
+	if f.walkable then
+		p.Y = p.Y + 1
+		n = env_get_node(env, p)
+		f = get_content_features(n.content)
+		if f.walkable then
+			-- Too high
+			return -1
+		end
+		-- Hill
+		return 2
+	end
+	p.Y = p.Y - 1
+	n = env_get_node(env, p)
+	f = get_content_features(n.content)
+	if f.walkable then
+		-- Flat
+		return 1
+	end
+	-- Drop
+	return 0
+end
+
+function on_step(self, dtime)
+	-- Limit step to a sane value; it jumps a lot while the map generator
+	-- is in action
+	if dtime > 0.5 then
+		dtime = 0.5
+	end
+
+	env = object_get_environment(self)
+	
+	--[[
+	-- Returned value has these fields:
+	-- * int content
+	-- * int param1
+	-- * int param2
+	p = {X=position.X, Y=position.Y-0.35, Z=position.Z}
+	n = env_get_node(env, p)
+	f = get_content_features(n.content)
+	if f.walkable then
+		y_dir = 1
+	else
+		y_dir = -1
+	end
+	-- Keep the object approximately at ground level
+	position.Y = position.Y + dtime * 2.0 * y_dir
+
+	-- Move the object around
+	position.X = position.X + math.cos(math.pi+rotation.Y/180*math.pi)
+			* dtime * speed
+	position.Z = position.Z + math.sin(math.pi+rotation.Y/180*math.pi)
+			* dtime * speed
+	
+	-- Rotate the object if it is too far from the starting point
+	counter3 = counter3 - dtime
+	if counter3 < 0 then
+		counter3 = counter3 + 1
+		diff = vector_subtract(position, starting_position)
+		d = vector_length(diff)
+		--print("pos="..dump(position).." starting="..dump(starting_position))
+		--print("diff=" .. dump(diff))
+		--print("d=" .. d)
+		if d > 3 then
+			rotation.Y = rotation.Y + 90
+			--rotation.Y = rotation.Y + math.random(-180, 180)
+		end
+	end
+
+	-- This value has to be set; it determines to which player the
+	-- object is near to and such
+	object_set_base_position(self, position)
+
+	counter4 = counter4 - dtime
+	if counter4 < 0 then
+		--counter4 = counter4 + math.random(0.5,8)
+		counter4 = counter4 + 0.6/speed
+		-- Mess around with the map
+		if is_digger == true then
+			np = vector_add(position, {X=0,Y=-0.6,Z=0})
+			env_dig_node(env, np)
+		else
+			np = vector_add(position, {X=0,Y=0,Z=0})
+			env_place_node(env, np, {content=0})
+		end
+	end
+	--]]
+	
+	counter_move = counter_move - dtime
+	if counter_move < 0 then
+		counter_move = counter_move + 1/speed
+		if counter_move < 0 then counter_move = 0 end
+
+		old_position = vector_copy(position)
+
+		dirs = {
+			{X=1, Y=0, Z=0},
+			{X=-1, Y=0, Z=0},
+			{X=0, Y=0, Z=1},
+			{X=0, Y=0, Z=-1}
+		}
+		
+		best_dir = main_dir
+		best_goodness = dir_goodness(env, position, main_dir)
+
+		for k,v in ipairs(dirs) do
+			-- Don't go directly backwards
+			if not vector_eq(vector_subtract(vector_zero(), v), main_dir) then
+				goodness = dir_goodness(env, position, v)
+				if goodness > best_goodness then
+					best_dir = v
+					goodness = best_goodness
+				end
+			end
+		end
+
+		-- Place stone block when dir changed
+		if not vector_eq(main_dir, best_dir) then
+			np = vector_add(position, {X=0,Y=0,Z=0})
+			env_place_node(env, np, {content=CONTENT_STONE})
+		end
+
+		main_dir = best_dir
+
+		position = vector_add(position, main_dir)
+		
+		pos_diff = vector_subtract(position, old_position)
+		rotation.Y = math.atan2(pos_diff.Z, pos_diff.X)/math.pi*180-180
+		
+		-- Returned value has these fields:
+		-- * int content
+		-- * int param1
+		-- * int param2
+		p = {X=position.X, Y=position.Y, Z=position.Z}
+		n = env_get_node(env, p)
+		f = get_content_features(n.content)
+		if f.walkable then
+			position.Y = position.Y + 1
+		end
+		p = {X=position.X, Y=position.Y-1, Z=position.Z}
+		n = env_get_node(env, p)
+		f = get_content_features(n.content)
+		if not f.walkable then
+			position.Y = position.Y - 1
+		end
+		
+		-- Center in the middle of the node
+		position = vector_snap(position)
+	end
+
+	-- This value has to be set; it determines to which player the
+	-- object is near to and such
+	object_set_base_position(self, position)
+	
+	--[[
+	counter4 = counter4 - dtime
+	if counter4 < 0 then
+		--counter4 = counter4 + math.random(0.5,8)
+		counter4 = counter4 + 0.6/speed
+		-- Mess around with the map
+		if is_digger == true then
+			np = vector_add(position, {X=0,Y=-0.6,Z=0})
+			env_dig_node(env, np)
+		else
+			np = vector_add(position, {X=0,Y=0,Z=0})
+			env_place_node(env, np, {content=0})
+		end
+	end
+	--]]
+	
+	---[[
+	-- Send some custom messages at a custom interval
+	
+	counter = counter - dtime
+	if counter < 0 then
+		counter = counter + 0.25
+		if counter < 0 then
+			counter = 0
+		end
+
+		message = "pos " .. position.X .. " " .. position.Y .. " " .. position.Z
+		object_add_message(self, message)
+
+		message = "rot " .. rotation.X .. " " .. rotation.Y .. " " .. rotation.Z
+		object_add_message(self, message)
+	end
+	--]]
+
+	-- Remove the object after some time
+	death_counter = death_counter + dtime
+	if death_counter > 40 then
+		object_remove(self)
+	end
+
+end
+
+-- This stuff is passed to a newly created client-side counterpart of this object
+function on_get_client_init_data(self)
+	-- Just return some data for testing
+	return "result of get_client_init_data"
+end
+
+-- This should return some data that mostly saves the state of this object
+-- Not completely implemented yet
+function on_get_server_init_data(self)
+	-- Just return some data for testing
+	return "result of get_server_init_data"
+end
+
+-- When the object is loaded from scratch, this is called before the first
+-- on_step(). Data is an empty string or the output of an object spawner
+-- hook, but such things are not yet implemented.
+--
+-- At reload time, the last output of get_server_init_data is passed as data.
+--
+-- This should initialize the position of the object to the value returned
+--   by object_get_base_position(self)
+--
+-- Not completely implemented yet
+--
+function on_initialize(self, data)
+	print("server object got initialization: " .. data)
+	position = object_get_base_position(self)
+	starting_position = vector_copy(position);
+	if math.random() < 0.5 then
+		is_digger = true
+	end
+end
+