Initial commit

11 files changed, 795 insertions, 0 deletions

diff --git a/railcart/LICENSE.txt b/railcart/LICENSE.txt
new file mode 100644
index 0000000..5f3db02
--- /dev/null
+++ b/railcart/LICENSE.txt
@@ -0,0 +1,19 @@
+Minetest Mod - Railcart [railcart]
+==================================
+
+License Source Code: LGPL v2.1
+
+License of media (textures, sounds and models): CC-0
+
+Authors of media files:
+-----------------------
+
+kddekadenz:
+  cart_bottom.png
+  cart_side.png
+  cart_top.png
+
+Zeg9:
+  cart.x
+  cart.png
+
diff --git a/railcart/README.txt b/railcart/README.txt
new file mode 100644
index 0000000..dd4d70e
--- /dev/null
+++ b/railcart/README.txt
@@ -0,0 +1,30 @@
+Minetest Mod - Railcart [railcart]
+==================================
+
+Minetest version: 0.4.13
+
+Depends: railtrack
+
+Proof of concept ground up re-write of the carts mod. Currently uses media files
+borrowed from the original carts mod by PilzAdam.
+
+Please note, this mod makes heavy use of metadata so that carts are able to
+travel through unloaded map chunks, therefor a 'carts' privilege is required
+to place or pick up carts in multiplayer mode.
+
+Crafting
+--------
+
+S = Steel Ingot [default:steel_ingot]
+W = Wood [group:wood]
+
+Railcart: [railcart:cart]
+
++---+---+---+
+| S |   | S |
++---+---+---+
+| S |   | S |
++---+---+---+
+| W | S | W |
++---+---+---+
+
diff --git a/railcart/depends.txt b/railcart/depends.txt
new file mode 100644
index 0000000..e602f16
--- /dev/null
+++ b/railcart/depends.txt
@@ -0,0 +1 @@
+railtrack
diff --git a/railcart/init.lua b/railcart/init.lua
new file mode 100644
index 0000000..df9d4f1
--- /dev/null
+++ b/railcart/init.lua
@@ -0,0 +1,154 @@
+local modpath = minetest.get_modpath(minetest.get_current_modname())
+
+dofile(modpath.."/railcart.lua")
+
+local worldpath = minetest.get_worldpath()
+local input = io.open(worldpath.."/railcart.txt", "r")
+if input then
+	local data = input:read('*all')
+	if data then
+		local carts = minetest.deserialize(data) or {}
+		for id, ref in pairs(carts) do
+			railcart.allcarts[id] = railcart.cart:new(ref)
+		end
+	end
+	input = nil
+end
+
+local function is_valid_player(object)
+	if object then
+		return object:is_player()
+	end
+end
+
+minetest.register_globalstep(function(dtime)
+	for _, cart in pairs(railcart.allcarts) do
+		cart:on_step(dtime)
+	end
+	railcart.timer = railcart.timer + dtime
+	if railcart.timer > RAILCART_OBJECT_SAVE_TIME then
+		railcart:save()
+		railcart.timer = 0
+	end
+end)
+
+minetest.register_privilege("carts", "Player can pick-up and place carts.")
+
+minetest.register_entity("railcart:cart_entity", {
+	physical = false,
+	collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
+	visual = "mesh",
+	mesh = "railcart.x",
+	visual_size = {x=1, y=1},
+	textures = {"cart.png"},
+	cart = nil,
+	driver = nil,
+	timer = 0,
+	on_activate = function(self, staticdata, dtime_s)
+		self.object:set_armor_groups({immortal=1})
+		if staticdata == "expired" then
+			self.object:remove()
+		end
+	end,
+	on_punch = function(self, puncher, _, _, direction)
+		if not is_valid_player(puncher) then
+			return
+		end	
+		if puncher:get_player_control().sneak then
+			if self.cart then
+				if self.cart.id then
+					railcart.allcarts[self.cart.id] = nil
+				end
+			end
+			self.object:remove()
+			local inv = puncher:get_inventory()
+			if minetest.setting_getbool("creative_mode") then
+				if not inv:contains_item("main", "railcart:cart") then
+					inv:add_item("main", "railcart:cart")
+				end
+			else
+				inv:add_item("main", "railcart:cart")
+			end
+			return
+		end
+		if self.cart and direction then
+			local pos = vector.round(self.object:getpos())
+			local dir = vector.round(vector.normalize(direction))
+			self.timer = 0
+			self.cart.target = nil
+			self.cart.prev = pos
+			self.cart.vel = vector.multiply(dir, 4)
+			self.cart.accel = railtrack:get_acceleration(pos)
+			self.object:setvelocity(self.cart.vel)
+		end
+	end,
+	on_rightclick = function(self, clicker)
+		if not is_valid_player(clicker) then
+			return
+		end
+		if self.driver and clicker == self.driver then
+			self.driver = nil
+			clicker:set_detach()
+		elseif not self.driver then
+			self.driver = clicker
+			clicker:set_attach(self.object, "", {x=0,y=5,z=0}, {x=0,y=0,z=0})
+		end
+	end,
+	on_step = function(self, dtime)
+		local cart = self.cart
+		local object = self.object
+		if not cart or not object then
+			return
+		end
+		self.timer = self.timer - dtime
+		if self.timer > 0 then
+			return
+		end
+		self.timer = railcart:update(cart, RAILCART_ENTITY_UPDATE_TIME, object)
+	end,
+	get_staticdata = function(self)
+		return "expired"
+	end,
+})
+
+minetest.register_craftitem("railcart:cart", {
+	description = "Railcart",
+	inventory_image = minetest.inventorycube("cart_top.png", "cart_side.png", "cart_side.png"),
+	wield_image = "cart_side.png",
+	on_place = function(itemstack, placer, pointed_thing)
+		local name = placer:get_player_name()
+		if not name or pointed_thing.type ~= "node" then
+			return
+		end
+		local pos = pointed_thing.under
+		if not railtrack:is_railnode(pos) then
+			return
+		end
+		if not minetest.is_singleplayer() then
+			if not minetest.check_player_privs(name, {carts=true}) then
+				minetest.chat_send_player(name, "Requires carts privilege")
+				return
+			end
+		end
+		local cart = railcart.cart:new()
+		cart.id = #railcart.allcarts + 1
+		cart.pos = pos
+		cart.prev = vector.new(pos)
+		cart.accel = railtrack:get_acceleration(pos)
+		table.insert(railcart.allcarts, cart)
+		if not minetest.setting_getbool("creative_mode") then
+			itemstack:take_item()
+		end
+		return itemstack
+	end,
+})
+
+minetest.register_craft({
+	output = "railcart:cart",
+	recipe = {
+		{"default:steel_ingot", "", "default:steel_ingot"},
+		{"default:steel_ingot", "", "default:steel_ingot"},
+		{"group:wood", "default:steel_ingot", "group:wood"},
+	},
+})
+
diff --git a/railcart/models/cart.png b/railcart/models/cart.png
new file mode 100644
index 0000000..1f9f568
--- /dev/null
+++ b/railcart/models/cart.png
diff --git a/railcart/models/railcart.x b/railcart/models/railcart.x
new file mode 100644
index 0000000..3325aaf
--- /dev/null
+++ b/railcart/models/railcart.x
@@ -0,0 +1,339 @@
+xof 0303txt 0032
+
+Frame Root {
+  FrameTransformMatrix {
+     1.000000, 0.000000, 0.000000, 0.000000,
+     0.000000, 0.000000, 1.000000, 0.000000,
+     0.000000, 1.000000,-0.000000, 0.000000,
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+  }
+  Frame Cube {
+    FrameTransformMatrix {
+       5.000000, 0.000000,-0.000000, 0.000000,
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+    }
+    Mesh { //Cube_001 Mesh
+      72;
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+      MeshMaterialList { //Cube_001 Material List
+        1;
+        18;
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+          TextureFilename {"cart.png";}
+        }
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+    } //End of Cube_001 Mesh
+  } //End of Cube
+} //End of Root Frame
+AnimationSet {
+  Animation {
+    {Cube}
+    AnimationKey { //Position
+      2;
+      4;
+      0;3;     0.000000, 0.000000, 0.000000;;,
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+      3;3;     0.000000,-3.000000, 3.000000;;;
+    }
+    AnimationKey { //Rotation
+      0;
+      4;
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+      3;4;    -0.923880, 0.382683, 0.000000, 0.000000;;;
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+    AnimationKey { //Scale
+      1;
+      4;
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+  }
+} //End of AnimationSet
diff --git a/railcart/railcart.lua b/railcart/railcart.lua
new file mode 100644
index 0000000..917da44
--- /dev/null
+++ b/railcart/railcart.lua
@@ -0,0 +1,252 @@
+RAILCART_ENTITY_UPDATE_TIME = 1
+RAILCART_OBJECT_UPDATE_TIME = 5
+RAILCART_OBJECT_SAVE_TIME = 10
+RAILCART_RELOAD_DISTANCE = 32
+RAILCART_SNAP_DISTANCE = 0.5
+RAILCART_SPEED_MIN = 0.1
+RAILCART_SPEED_MAX = 10
+
+railcart = {
+	timer = 0,
+	allcarts = {},
+}
+
+railcart.cart = {
+	id = nil,
+	entity = {},
+	pos = nil,
+	target = nil,
+	prev = nil,
+	accel = nil,
+	dir = {x=0, y=0, z=0},
+	vel = {x=0, y=0, z=0},
+	acc = {x=0, y=0, z=0},
+	timer = 0,
+}
+
+function railcart.cart:new(obj)
+	obj = obj or {}
+	setmetatable(obj, self)
+	self.__index = self
+	return obj
+end
+
+function railcart.cart:is_loaded()
+	for _, player in pairs(minetest.get_connected_players()) do
+		local pos = player:getpos()
+		if pos then
+			local dist = railtrack:get_distance(pos, self.pos)
+			if dist <= RAILCART_RELOAD_DISTANCE then
+				return true
+			end
+		end
+	end
+	return false
+end
+
+function railcart.cart:on_step(dtime)
+	self.timer = self.timer - dtime
+	if self.timer > 0 then
+		return
+	end
+	self.timer = RAILCART_OBJECT_UPDATE_TIME
+	local entity = railcart:get_cart_ref(self.id)
+	if entity.object then
+		return
+	end
+	if self:is_loaded() then
+		local object = minetest.add_entity(self.pos, "railcart:cart_entity")
+		if object then
+			entity = object:get_luaentity() or {}
+			entity.cart = self
+			object:setvelocity(self.vel)
+			object:setacceleration(self.acc)
+		end
+	else
+		self.timer = railcart:update(self, self.timer)
+	end
+end
+
+function railcart:save()
+	local carts = {}
+	for id, cart in pairs(railcart.allcarts) do
+		local ref = {}
+		for k, v in pairs(cart) do
+			ref[k] = v
+		end
+		ref.entity = nil
+		table.insert(carts, ref)
+	end
+	local output = io.open(minetest.get_worldpath().."/railcart.txt",'w')
+	if output then
+		output:write(minetest.serialize(carts))
+		io.close(output)
+	end
+end
+
+function railcart:get_cart_ref(id)
+	local cart_ref = {}
+	for _, ref in pairs(minetest.luaentities) do
+		if ref.cart then
+			if ref.cart.id == id then
+				cart_ref = ref
+				break
+			end
+		end
+	end
+	return cart_ref
+end
+
+function railcart:get_delta_time(vel, acc, dist)
+	if vel > 0 then
+		if acc == 0 then
+			return dist / vel
+		end
+		local r = math.sqrt(vel * vel + 2 * acc * dist)
+		if r > 0 then
+			return (-vel + r) / acc
+		end
+	end
+	return 9999 --INF
+end
+
+function railcart:velocity_to_dir(v)
+	if math.abs(v.x) > math.abs(v.z) then
+		return {x=railtrack:get_sign(v.x), y=railtrack:get_sign(v.y), z=0}
+	else
+		return {x=0, y=railtrack:get_sign(v.y), z=railtrack:get_sign(v.z)}
+	end
+end
+
+function railcart:velocity_to_speed(vel)
+	local speed = math.max(math.abs(vel.x), math.abs(vel.z))
+	if speed < RAILCART_SPEED_MIN then
+		speed = 0
+	elseif speed > RAILCART_SPEED_MAX then
+		speed = RAILCART_SPEED_MAX
+	end
+	return speed
+end
+
+function railcart:get_target(pos, vel)
+	local meta = minetest.get_meta(vector.round(pos))
+	local dir = self:velocity_to_dir(vel)
+	local targets = {}
+	local rots = RAILTRACK_ROTATIONS
+	local contype = meta:get_string("contype") or ""
+	local s_junc = meta:get_string("junctions") or ""
+	local s_cons = meta:get_string("connections") or ""
+	local s_rots = meta:get_string("rotations") or ""
+	if contype == "section" then
+		local junctions = minetest.deserialize(s_junc) or {}
+		for _, p in pairs(junctions) do
+			table.insert(targets, p)
+		end
+	else
+		local cons = minetest.deserialize(s_cons) or {}
+		for _, p in pairs(cons) do
+			table.insert(targets, p)
+		end
+		if s_rots ~= "" then
+			local fwd = false
+			for _, p in pairs(cons) do
+				if vector.equals(vector.add(pos, dir), p) then
+					fwd = true
+				end
+			end
+			if fwd == true or #cons == 1 then
+				rots = s_rots
+			end
+		end
+	end
+	local rotations = railtrack:get_rotations(rots, dir)
+	for _, r in ipairs(rotations) do
+		for _, t in pairs(targets) do
+			local d = railtrack:get_direction(t, pos)
+			if r.x == d.x and r.z == d.z then
+				return t
+			end
+		end
+	end
+end
+
+function railcart:update(cart, time, object)
+	if object then
+		cart.pos = object:getpos()
+		cart.vel = object:getvelocity()
+	end
+	if not cart.target then
+		cart.pos = vector.new(cart.prev)
+		cart.target = railcart:get_target(cart.pos, cart.vel)
+		if object then
+			object:moveto(cart.pos)
+		end
+	end
+	local speed = railcart:velocity_to_speed(cart.vel)
+	if not cart.target then
+		speed = 0
+	end
+	if speed > RAILCART_SPEED_MIN then
+		cart.dir = railtrack:get_direction(cart.target, cart.pos)
+		local d1 = railtrack:get_distance(cart.prev, cart.target)
+		local d2 = railtrack:get_distance(cart.prev, cart.pos)
+		local dist = d1 - d2
+		if dist > RAILCART_SNAP_DISTANCE then
+			local accel = RAILTRACK_ACCEL_FLAT
+			if cart.dir.y == -1 then
+				accel = RAILTRACK_ACCEL_DOWN
+			elseif cart.dir.y == 1 then
+				accel = RAILTRACK_ACCEL_UP
+			end
+			accel = cart.accel or accel
+			local dt = railcart:get_delta_time(speed, accel, dist)
+			if dt < time then
+				time = dt
+			end
+			local dp = speed * time + 0.5 * accel * time * time
+			local vf = speed + accel * time
+			if object then
+				if vf <= 0 then
+					speed = 0
+					accel = 0
+				end
+				cart.vel = vector.multiply(cart.dir, speed)
+				cart.acc = vector.multiply(cart.dir, accel)
+			elseif dp > 0 then
+				cart.vel = vector.multiply(cart.dir, vf)
+				cart.pos = vector.add(cart.pos, vector.multiply(cart.dir, dp))
+			end
+		else
+			cart.pos = vector.new(cart.target)
+			cart.prev = vector.new(cart.target)
+			cart.accel = railtrack:get_acceleration(cart.target)
+			cart.target = nil
+			return 0
+		end
+	else
+		cart.vel = {x=0, y=0, z=0}
+		cart.acc = {x=0, y=0, z=0}
+	end
+	if object then
+		if cart.dir.y == -1 then
+			object:set_animation({x=1, y=1}, 1, 0)
+		elseif cart.dir.y == 1 then
+			object:set_animation({x=2, y=2}, 1, 0)
+		else
+			object:set_animation({x=0, y=0}, 1, 0)
+		end
+		if cart.dir.x < 0 then
+			object:setyaw(math.pi / 2)
+		elseif cart.dir.x > 0 then
+			object:setyaw(3 * math.pi / 2)
+		elseif cart.dir.z < 0 then
+			object:setyaw(math.pi)
+		elseif cart.dir.z > 0 then
+			object:setyaw(0)
+		end
+		object:setvelocity(cart.vel)
+		object:setacceleration(cart.acc)
+	end
+	return time
+end
+
diff --git a/railcart/textures/cart.png b/railcart/textures/cart.png
new file mode 100644
index 0000000..1f9f568
--- /dev/null
+++ b/railcart/textures/cart.png
diff --git a/railcart/textures/cart_bottom.png b/railcart/textures/cart_bottom.png
new file mode 100644
index 0000000..f84b1ae
--- /dev/null
+++ b/railcart/textures/cart_bottom.png
diff --git a/railcart/textures/cart_side.png b/railcart/textures/cart_side.png
new file mode 100644
index 0000000..79f6c32
--- /dev/null
+++ b/railcart/textures/cart_side.png
diff --git a/railcart/textures/cart_top.png b/railcart/textures/cart_top.png
new file mode 100644
index 0000000..8140fc7
--- /dev/null
+++ b/railcart/textures/cart_top.png