boost_cart/init.lua

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Lua
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-- TODO:
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-- Add rail-cross switching
-- Prevent from floating carts
boost_cart = {}
boost_cart.modpath = minetest.get_modpath("boost_cart")
boost_cart.speed_max = 10
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function vector.floor(v)
return {
x = math.floor(v.x),
y = math.floor(v.y),
z = math.floor(v.z)
}
end
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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
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clicker:set_attach(self.object, "", {x=0, y=5, z=0}, {x=0, y=0, z=0})
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end
end
function boost_cart.cart:on_activate(staticdata, dtime_s)
self.object:set_armor_groups({immortal=1})
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", "carts:cart")
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return
end
local vel = self.velocity
if puncher:get_player_name() == self.driver then
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if math.abs(vel.x) + math.abs(vel.z) > 6 then
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return
end
end
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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)
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local f = 4 * (time_from_last_punch / tool_capabilities.full_punch_interval)
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vel.x = dir.x * f
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vel.y = dir.y * f
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vel.z = dir.z * f
self.velocity = vel
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self.old_pos = nil
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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)
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self.velocity = {x=0, y=0, z=0}
elseif vector.equals(vel, {x=0, y=0, z=0}) then
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return
end
local pos = self.object:getpos()
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if self.old_pos and not self.punch then
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local flo_pos = vector.floor(pos)
local flo_old = vector.floor(self.old_pos)
if vector.equals(flo_pos, flo_old) then
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return
end
local diff = vector.subtract(self.old_pos, pos)
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for _,v in ipairs({"x","y","z"}) do
if math.abs(diff[v]) > 1.4 then
pos = vector.add(self.old_pos, self.old_dir)
self.punch = true
--minetest.log("action", "Cart moving too fast at "..minetest.pos_to_string(pos))
break
end
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end
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end
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local ro_vel = vector.round(vel)
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local cart_dir = {
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x = boost_cart:get_sign(ro_vel.x),
y = boost_cart:get_sign(ro_vel.y),
z = boost_cart:get_sign(ro_vel.z)
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}
local max_vel = boost_cart.speed_max
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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
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vel.y = dir.y * (math.abs(vel.x) + math.abs(vel.z))
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pos = vector.round(pos)
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self.punch = true
end
-- Slow down or speed up..
local acc = dir.y * -2
local speed_mod = tonumber(minetest.get_meta(pos):get_string("cart_acceleration"))
if speed_mod and speed_mod ~= 0 then
if speed_mod > 0 then
local is_limit = false
for _,v in ipairs({"x","y","z"}) do
if math.abs(vel[v]) >= max_vel then
speed_mod = 0
break
end
end
end
acc = acc + (speed_mod * 6)
else
acc = acc - 0.4
end
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local new_acc = {
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x = dir.x * acc,
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y = dir.y * acc,
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z = dir.z * acc
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}
self.object:setacceleration(new_acc)
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end
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self.old_pos = vector.new(pos)
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self.old_dir = vector.new(dir)
-- Limits
for _,v in ipairs({"x","y","z"}) do
if math.abs(vel[v]) > max_vel then
vel[v] = boost_cart:get_sign(vel[v]) * max_vel
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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)
end
self.punch = false
end
minetest.register_entity(":carts:cart", boost_cart.cart)
minetest.register_craftitem(":carts:cart", {
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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, "carts:cart")
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elseif boost_cart:is_rail(pointed_thing.above) then
minetest.add_entity(pointed_thing.above, "carts:cart")
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else return end
itemstack:take_item()
return itemstack
end,
})