commit ced150bc5b1cb79a484f013b1bb4fe154493a600
Author: SmallJoker <st.rentsch@hotmail.com>
Date:   Tue Jul 22 23:15:43 2014 +0200

    Upload

diff --git a/README.txt b/README.txt
new file mode 100644
index 0000000..4ec9bb8
--- /dev/null
+++ b/README.txt
@@ -0,0 +1,23 @@
+Minetest mod: boost_cart
+=======================
+Based on the mod "carts" by PilzAdam
+Target: Run smoothly and do not use too much CPU
+
+License of source code:
+-----------------------
+WTFPL
+
+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/depends.txt b/depends.txt
new file mode 100644
index 0000000..331d858
--- /dev/null
+++ b/depends.txt
@@ -0,0 +1 @@
+default
\ No newline at end of file
diff --git a/functions.lua b/functions.lua
new file mode 100644
index 0000000..b6bab4e
--- /dev/null
+++ b/functions.lua
@@ -0,0 +1,103 @@
+function boost_cart:get_sign(z)
+	if z == 0 then
+		return 0
+	else
+		return z / math.abs(z)
+	end
+end
+
+function boost_cart:velocity_to_dir(v)
+	if math.abs(v.x) > math.abs(v.z) then
+		return {x=boost_cart:get_sign(v.x), y=boost_cart:get_sign(v.y), z=0}
+	else
+		return {x=0, y=boost_cart:get_sign(v.y), z=boost_cart:get_sign(v.z)}
+	end
+end
+
+function boost_cart:is_rail(pos)
+	local node = minetest.get_node(pos).name
+	return minetest.get_item_group(node, "rail") ~= 0
+end
+
+function boost_cart:get_rail_direction(pos_, dir_)
+	local pos = vector.round(pos_)
+	local dir = vector.new(dir_)
+	local cur = nil
+	
+	-- Front
+	dir.y = 0
+	cur = vector.add(pos, dir)
+	if boost_cart:is_rail(cur) then
+		return dir
+	end
+	
+	-- Down
+	dir.y = -1
+	cur = vector.add(pos, dir)
+	if boost_cart:is_rail(cur) then
+		return dir
+	end
+	
+	-- Up
+	dir.y = 1
+	cur = vector.add(pos, dir)
+	if boost_cart:is_rail(cur) then
+		return dir
+	end
+	
+	-- Left, right
+	dir.y = 0
+	
+	-- Check left and right
+	local view, opposite, val
+	
+	if dir.x == 0 and dir.z ~= 0 then
+		view = "z"
+		other = "x"
+		if dir.z < 0 then
+			val = {1, -1}
+		else
+			val = {-1, 1}
+		end
+	elseif dir.z == 0 and dir.x ~= 0 then
+		view = "x"
+		other = "z"
+		if dir.x > 0 then
+			val = {1, -1}
+		else
+			val = {-1, 1}
+		end
+	else
+		return {x=0, y=0, z=0}
+	end
+	
+	dir[view] = 0
+	dir[other] = val[1]
+	cur = vector.add(pos, dir)
+	if boost_cart:is_rail(cur) then
+		return dir
+	end
+	
+	-- Down
+	dir.y = -1
+	cur = vector.add(pos, dir)
+	if boost_cart:is_rail(cur) then
+		return dir
+	end
+	dir.y = 0
+	
+	dir[other] = val[2]
+	cur = vector.add(pos, dir)
+	if boost_cart:is_rail(cur) then
+		return dir
+	end
+	
+	-- Down
+	dir.y = -1
+	cur = vector.add(pos, dir)
+	if boost_cart:is_rail(cur) then
+		return dir
+	end
+	
+	return {x=0, y=0, z=0}
+end
diff --git a/init.lua b/init.lua
new file mode 100644
index 0000000..ca4adbb
--- /dev/null
+++ b/init.lua
@@ -0,0 +1,208 @@
+-- TODO: 
+--  Fix way-up
+--  Add rail-cross switching
+--  Prevent from floating carts
+--  Speed up and brake rails
+
+boost_cart = {}
+boost_cart.modpath = minetest.get_modpath("boost_cart")
+boost_cart.speed_max = 8
+
+dofile(boost_cart.modpath.."/functions.lua")
+dofile(boost_cart.modpath.."/rails.lua")
+
+boost_cart.cart = {
+	physical = false,
+	collisionbox = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
+	visual = "mesh",
+	mesh = "cart.x",
+	visual_size = {x=1, y=1},
+	textures = {"cart.png"},
+	
+	driver = nil,
+	punch = false, -- used to re-send velocity and position
+	velocity = {x=0, y=0, z=0}, -- only used on punch
+	old_dir = {x=0, y=0, z=0},
+	old_pos = nil
+}
+
+function boost_cart.cart:on_rightclick(clicker)
+	if not clicker or not clicker:is_player() then
+		return
+	end
+	local player_name = clicker:get_player_name()
+	if self.driver and player_name == self.driver then
+		self.driver = nil
+		clicker:set_detach()
+	elseif not self.driver then
+		self.driver = player_name
+		clicker:set_attach(self.object, "", {x=0,y=5,z=0}, {x=0,y=0,z=0})
+	end
+end
+
+function boost_cart.cart:on_activate(staticdata, dtime_s)
+	self.object:set_armor_groups({immortal=1})
+	self.old_pos = self.object:getpos()
+end
+
+function boost_cart.cart:on_punch(puncher, time_from_last_punch, tool_capabilities, direction)
+	if not puncher or not puncher:is_player() then
+		return
+	end
+
+	if puncher:get_player_control().sneak then
+		if self.driver then
+			local player = minetest.get_player_by_name(self.driver)
+			if player then
+				player:set_detach()
+			end
+		end
+    	self.object:remove()
+		puncher:get_inventory():add_item("main", "boost_cart:cart")
+		return
+	end
+	
+	local vel = self.velocity
+	if puncher:get_player_name() == self.driver then
+		if math.abs(vel.x) > 2 or math.abs(vel.z) > 2 then
+			return
+		end
+	end
+	
+	local cart_dir = boost_cart:velocity_to_dir(direction)
+	if cart_dir.x == 0 and cart_dir.z == 0 then
+		local fd = minetest.dir_to_facedir(puncher:get_look_dir())
+		if fd == 0 then
+			cart_dir.x = 1
+		elseif fd == 1 then
+			cart_dir.z = -1
+		elseif fd == 2 then
+			cart_dir.x = -1
+		elseif fd == 3 then
+			cart_dir.z = 1
+		end
+	end
+
+	if time_from_last_punch > tool_capabilities.full_punch_interval then
+		time_from_last_punch = tool_capabilities.full_punch_interval
+	end
+	local dir = boost_cart:get_rail_direction(self.object:getpos(), cart_dir)
+	
+	local f = 3 * (time_from_last_punch / tool_capabilities.full_punch_interval)
+	vel.x = dir.x * f
+	vel.z = dir.y * f
+	vel.z = dir.z * f
+	self.velocity = vel
+	self.punch = true
+end
+
+function boost_cart.cart:on_step(dtime)
+	local vel = self.object:getvelocity()
+	if self.punch then
+		vel = vector.add(vel, self.velocity)
+		self.velocity = {x=0,y=0,z=0}
+	elseif vector.equals(vel, {x=0,y=0,z=0}) then
+		return
+	end
+	
+	local pos = self.object:getpos()
+	local fpos, fold_pos = vector.round(pos), vector.round(self.old_pos)
+	if vector.equals(fpos, fold_pos) and not self.punch then
+		return
+	end
+	self.old_pos = vector.new(pos)
+	
+	local cart_dir = {
+		x = boost_cart:get_sign(vel.x),
+		y = boost_cart:get_sign(vel.y),
+		z = boost_cart:get_sign(vel.z)
+	}
+	local dir = boost_cart:get_rail_direction(pos, cart_dir)
+	if vector.equals(dir, {x=0, y=0, z=0}) then
+		vel = {x=0, y=0, z=0}
+		self.object:setacceleration({x=0, y=0, z=0})
+		self.punch = true
+	else
+		-- If the direction changed
+		if dir.x ~= 0 and self.old_dir.z ~= 0 then
+			vel.x = dir.x * math.abs(vel.z)
+			vel.z = 0
+			pos.z = math.floor(pos.z + 0.5)
+			self.punch = true
+		end
+		if dir.z ~= 0 and self.old_dir.x ~= 0 then
+			vel.z = dir.z * math.abs(vel.x)
+			vel.x = 0
+			pos.x = math.floor(pos.x + 0.5)
+			self.punch = true
+		end
+		-- Up, down?
+		if dir.y ~= self.old_dir.y then
+			vel.y = dir.y * (math.abs(vel.x) + math.abs(vel.z))
+			pos.y = math.floor(pos.y + 0.5)
+			self.punch = true
+		end
+		
+		-- Slow down or speed up..
+		local acc = -2 * dir.y - 0.4
+		self.object:setacceleration({
+			x = dir.x * acc, 
+			y = dir.y * (math.abs(dir.x) + math.abs(dir.z)) * acc, 
+			z = dir.z * acc
+		})
+	end
+	
+	self.old_dir = vector.new(dir)
+	
+	-- Limits
+	for _,v in ipairs({"x","y","z"}) do
+		if math.abs(vel[v]) > boost_cart.speed_max then
+			vel[v] = boost_cart:get_sign(vel[v]) * boost_cart.speed_max
+			self.punch = true
+		end
+	end
+	
+	if dir.x < 0 then
+		self.object:setyaw(math.pi / 2)
+	elseif dir.x > 0 then
+		self.object:setyaw(3 * math.pi / 2)
+	elseif dir.z < 0 then
+		self.object:setyaw(math.pi)
+	elseif dir.z > 0 then
+		self.object:setyaw(0)
+	end
+
+	if dir.y == -1 then
+		self.object:set_animation({x=1, y=1}, 1, 0)
+	elseif dir.y == 1 then
+		self.object:set_animation({x=2, y=2}, 1, 0)
+	else
+		self.object:set_animation({x=0, y=0}, 1, 0)
+	end
+	if self.punch then
+		self.object:setvelocity(vel)
+		self.object:setpos(pos)
+		self.old_pos = {x=0, y=0, z=0}
+	end
+	self.punch = false
+end
+
+minetest.register_entity("boost_cart:cart", boost_cart.cart)
+minetest.register_craftitem("boost_cart:cart", {
+	description = "Cart",
+	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)
+		if not pointed_thing.type == "node" then
+			return
+		end
+		if boost_cart:is_rail(pointed_thing.under) then
+			minetest.add_entity(pointed_thing.under, "boost_cart:cart")
+		elseif boost_cart:is_rail(pointed_thing.above) then
+			minetest.add_entity(pointed_thing.above, "boost_cart:cart")
+		else return end
+		
+		itemstack:take_item()
+		return itemstack
+	end,
+})
\ No newline at end of file
diff --git a/models/cart.png b/models/cart.png
new file mode 100644
index 0000000..d4b12d6
Binary files /dev/null and b/models/cart.png differ
diff --git a/models/cart.x b/models/cart.x
new file mode 100644
index 0000000..3325aaf
--- /dev/null
+++ b/models/cart.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,
+     0.000000, 0.000000, 0.000000, 1.000000;;
+  }
+  Frame Cube {
+    FrameTransformMatrix {
+       5.000000, 0.000000,-0.000000, 0.000000,
+      -0.000000, 3.535534, 3.535534, 0.000000,
+       0.000000,-3.535534, 3.535534, 0.000000,
+       0.000000,-3.000000, 3.000000, 1.000000;;
+    }
+    Mesh { //Cube_001 Mesh
+      72;
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+      MeshNormals { //Cube_001 Normals
+        72;
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+      } //End of Cube_001 Normals
+      MeshMaterialList { //Cube_001 Material List
+        1;
+        18;
+        0,
+        0,
+        0,
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+           96.078431;
+           0.500000; 0.500000; 0.500000;;
+           0.000000; 0.000000; 0.000000;;
+          TextureFilename {"cart.png";}
+        }
+      } //End of Cube_001 Material List
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+         0.031250; 0.468750;,
+         0.500000; 0.500000;,
+         0.500000; 0.000000;,
+         1.000000; 0.000000;,
+         1.000000; 0.500000;,
+         0.468750; 0.468750;,
+         0.500000; 0.468750;,
+         0.500000; 0.500000;,
+         0.468750; 0.500000;,
+         0.031250; 0.468750;,
+         0.468750; 0.468750;,
+         0.468750; 0.500000;,
+         0.031250; 0.500000;,
+         0.468750; 0.000000;,
+         0.500000; 0.000000;,
+         0.500000; 0.031250;,
+         0.468750; 0.031250;,
+         0.468750; 0.031250;,
+         0.500000; 0.031250;,
+         0.500000; 0.468750;,
+         0.468750; 0.468750;,
+         0.468750; 0.031250;,
+         0.031250; 0.031250;,
+         0.031250; 0.000000;,
+         0.468750; 0.000000;,
+         1.000000; 0.500000;,
+         0.500000; 0.500000;,
+         0.500000; 0.000000;,
+         1.000000; 0.000000;,
+         0.031250; 0.031250;,
+         0.000000; 0.031250;,
+         0.000000; 0.000000;,
+         0.031250; 0.000000;,
+         0.031250; 0.468750;,
+        -0.000000; 0.468750;,
+         0.000000; 0.031250;,
+         0.031250; 0.031250;,
+         0.000000; 0.500000;,
+         0.500000; 0.500000;,
+         0.500000; 1.000000;,
+         0.000000; 1.000000;,
+         1.000000; 0.500000;,
+         0.500000; 0.500000;,
+         0.500000; 0.000000;,
+         1.000000; 0.000000;,
+         1.000000; 0.500000;,
+         0.500000; 0.500000;,
+         0.500000; 0.000000;,
+         1.000000; 0.000000;,
+         1.000000; 0.500000;,
+         0.500000; 0.500000;,
+         0.500000; 0.000000;,
+         1.000000; 0.000000;,
+         0.500000; 0.500000;,
+         0.500000; 0.000000;,
+         1.000000; 0.000000;,
+         1.000000; 0.500000;,
+         1.000000; 0.000000;,
+         1.000000; 0.500000;,
+         0.500000; 0.500000;,
+         0.500000; 0.000000;,
+         0.500000; 0.500000;,
+         0.500000; 0.000000;,
+         1.000000; 0.000000;,
+         1.000000; 0.500000;;
+      } //End of Cube_001 UV Coordinates
+    } //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;;,
+      1;3;     0.000000, 3.000000, 3.000000;;,
+      2;3;     0.000000,-3.000000, 3.000000;;,
+      3;3;     0.000000,-3.000000, 3.000000;;;
+    }
+    AnimationKey { //Rotation
+      0;
+      4;
+      0;4;    -1.000000, 0.000000, 0.000000, 0.000000;;,
+      1;4;    -0.923880,-0.382683,-0.000000, 0.000000;;,
+      2;4;    -0.923880, 0.382683, 0.000000, 0.000000;;,
+      3;4;    -0.923880, 0.382683, 0.000000, 0.000000;;;
+    }
+    AnimationKey { //Scale
+      1;
+      4;
+      0;3;     5.000000, 5.000000, 5.000000;;,
+      1;3;     5.000000, 5.000000, 5.000000;;,
+      2;3;     5.000000, 5.000000, 5.000000;;,
+      3;3;     5.000000, 5.000000, 5.000000;;;
+    }
+  }
+} //End of AnimationSet
diff --git a/rails.lua b/rails.lua
new file mode 100644
index 0000000..0cdac7a
--- /dev/null
+++ b/rails.lua
@@ -0,0 +1,16 @@
+minetest.register_node(":default:rail", {
+	description = "Rail",
+	drawtype = "raillike",
+	tiles = {"default_rail.png", "default_rail_curved.png", "default_rail_t_junction.png", "default_rail_crossing.png"},
+	inventory_image = "default_rail.png",
+	wield_image = "default_rail.png",
+	paramtype = "light",
+	sunlight_propagates = true,
+	is_ground_content = true,
+	walkable = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
+	},
+	groups = {dig_immediate = 2, attached_node = 1, rail = 1, connect_to_raillike = 1},
+})
\ No newline at end of file
diff --git a/textures/cart_bottom.png b/textures/cart_bottom.png
new file mode 100644
index 0000000..e74ef2b
Binary files /dev/null and b/textures/cart_bottom.png differ
diff --git a/textures/cart_side.png b/textures/cart_side.png
new file mode 100644
index 0000000..1bd55e7
Binary files /dev/null and b/textures/cart_side.png differ
diff --git a/textures/cart_top.png b/textures/cart_top.png
new file mode 100644
index 0000000..b763025
Binary files /dev/null and b/textures/cart_top.png differ