BlockColor-CDB/mods/Cars/driftcar/init.lua

470 lines
12 KiB
Lua

-- Parameters
local AVIEW = false -- Autorotate view to velocity direction
local GRIP = 6 -- Maximum linear and lateral acceleration, in nodes/s^2
local SZTORQ = 16 -- Car speed where motor torque drops to zero, in nodes/s
local DRAG = 0.03 -- Air drag
local ROLRES = 0.3 -- Rolling resistence
local GRAV = 9.81 -- Acceleration of gravity, in nodes/s^2
-- Turn parameters, in radians/s or radians/s^2
local TINIT = 0.36 -- Initial turn speed on first control input
local TACC = 0.12 -- Turn acceleration on control input
local TMAX = 2.4 -- Maximum turn speed
local TDEC = 0.24 -- Turn deceleration on no control input
-- End of parameters
local source_list = {
{"black", "Darkened", "292421", 40, 36, 33},
{"blue", "Blue", "0000FF", 0, 0, 255},
{"green", "Green", "00FF00", 0, 255, 0},
{"white", "White", "F5F5F5", 245, 245, 245},
{"orange", "Orange", "FF6103", 255, 97, 3},
{"red", "Red", "FF0000", 255, 0, 0},
{"yellow", "Yellow", "FFFF00", 255, 255, 0},
{"pink", "pink", "FF69B4", 255, 105, 180}
}
for i in ipairs(source_list) do
local name = source_list[i][1]
local description = source_list[i][2]
local colour = source_list[i][3]
local red = source_list[i][4]
local green = source_list[i][5]
local blue = source_list[i][6]
-- Constants
local sztorqmf = SZTORQ - 4
-- Functions
local function get_sign(n)
if n == 0 then
return 0
else
return n / math.abs(n)
end
end
local function get_vecmag(vec)
return math.sqrt(vec.x ^ 2 + vec.z ^ 2)
end
local function get_theta(vec) -- returns 0 to PI * 2
if vec.z == 0 then
return 0
end
if vec.z < 0 then
return math.atan(-vec.x / vec.z) + math.pi
end
if vec.x > 0 then
return math.atan(-vec.x / vec.z) + math.pi * 2
end
return math.atan(-vec.x / vec.z)
end
local function get_veccomp(vecmag, theta, y)
local x = -math.sin(theta) * vecmag
local z = math.cos(theta) * vecmag
return {x = x, y = y, z = z}
end
local function wrap_yaw(yaw) -- wrap to 0 to PI * 2
local fmod = math.fmod(yaw, math.pi * 2)
if fmod < 0 then
return fmod + math.pi * 2
end
return fmod
end
local function angbet(theta1, theta2) -- theta1 relative to theta2, -PI to PI
local ang = theta1 - theta2
if ang < -math.pi then
return ang + math.pi * 2
end
if ang > math.pi then
return ang - math.pi * 2
end
return ang
end
local function add_smoke_particle(pos, player_name)
minetest.add_particle({
pos = pos,
velocity = {x = 0, y = 0, z = 0},
acceleration = {x = 0, y = 0, z = 0},
expirationtime = 0.25,
size = 2.8,
collisiondetection = false,
collision_removal = false,
vertical = false,
texture = "driftcar_smoke.png",
playername = player_name,
})
end
-- Entity
local car = {
initial_properties = {
physical = true,
collide_with_objects = false, -- Fixes a MT 0.4.16 engine bug
collisionbox = {-0.53, -0.75, -0.53, 0.53, 0.75, 0.53},
visual = "wielditem",
visual_size = {x = 1.0, y = 1.0}, -- Scale up of nodebox is these * 1.5
textures = {"driftcar:driftcar_nodebox" .. name},
stepheight = 0.6,
},
-- Custom fields
driver = nil,
removed = false,
rot = 0,
}
function car.on_rightclick(self, clicker)
if not clicker or not clicker:is_player() then
return
end
local name = clicker:get_player_name()
if self.driver and name == self.driver then
-- Detach
self.driver = nil
clicker:set_detach()
default.player_attached[name] = false
default.player_set_animation(clicker, "stand" , 30)
local pos = clicker:getpos()
minetest.after(0.1, function()
clicker:setpos(pos)
end)
elseif not self.driver then
-- Attach
local attach = clicker:get_attach()
if attach and attach:get_luaentity() then
local luaentity = attach:get_luaentity()
if luaentity.driver then
luaentity.driver = nil
end
clicker:set_detach()
end
self.driver = name
clicker:set_attach(self.object, "",
{x = 0, y = -1, z = 0}, {x = 0, y = -1, z = 0})
default.player_attached[name] = true
minetest.after(0.2, function()
default.player_set_animation(clicker, "sit" , 30)
end)
clicker:set_look_horizontal(self.object:getyaw())
end
end
function car.on_activate(self, staticdata, dtime_s)
self.object:set_armor_groups({immortal = 1})
end
function car.on_punch(self, puncher)
if not puncher or not puncher:is_player() or self.removed then
return
end
local name = puncher:get_player_name()
if self.driver and name == self.driver then
-- Detach
self.driver = nil
puncher:set_detach()
default.player_attached[name] = false
end
if not self.driver then
-- Move to inventory
self.removed = true
local inv = puncher:get_inventory()
if not (creative and creative.is_enabled_for
and creative.is_enabled_for(name))
or not inv:contains_item("main", "driftcar:driftcar" .. name) then
end
minetest.after(0.1, function()
self.object:remove()
end)
end
end
function car.on_step(self, dtime)
local vel = self.object:getvelocity()
local velmag = get_vecmag(vel)
-- Early return for near-stationary vehicle with no driver
if not self.driver and velmag < 0.01 and vel.y == 0 then
self.object:setpos(self.object:getpos())
self.object:setvelocity({x = 0, y = 0, z = 0})
self.object:setacceleration({x = 0, y = 0, z = 0})
return
end
-- Angle of yaw relative to velocity, -PI to PI
local yawrtvel = angbet(
wrap_yaw(self.object:getyaw()),
get_theta(vel)
)
-- Velocity component linear to car
local linvel = math.cos(yawrtvel) * velmag
-- Touch ground bool
local under_pos = self.object:getpos()
under_pos.y = under_pos.y - 1.4
local node_under = minetest.get_node(under_pos)
local nodedef_under = minetest.registered_nodes[node_under.name]
local touch = nodedef_under.walkable
-- Torque acceleration applied linear to car
local taccmag = 0
-- Controls
if self.driver and touch then
local driver_objref = minetest.get_player_by_name(self.driver)
if driver_objref then
local ctrl = driver_objref:get_player_control()
if ctrl.up or ctrl.down then
-- Torque multiplier applied above 4nps to replicate reduction of
-- motor torque with rotation speed.
local torm = 1
local abslinvel = math.abs(linvel)
if abslinvel > 4 then
torm = (SZTORQ - abslinvel) / sztorqmf
end
if ctrl.up then
taccmag = GRIP * torm
elseif ctrl.down then
taccmag = -GRIP * torm
end
end
else
-- Player left server while driving
-- In MT 5.0.0 use 'airboat:on_detach_child()' to do this
self.driver = nil
minetest.log("warning", "[driftcar] Driver left server while" ..
" driving. This may cause some 'Pushing ObjectRef to" ..
" removed/deactivated object' warnings.")
end
end
-- Early return for near-stationary vehicle with driver
if taccmag == 0 and velmag < 0.01 and vel.y == 0 then
self.object:setpos(self.object:getpos())
self.object:setvelocity({x = 0, y = 0, z = 0})
self.object:setacceleration({x = 0, y = 0, z = 0})
return
end
-- Allows fast reduction of turn when no turn control
local noturnctrl = true
if self.driver and touch then
local driver_objref = minetest.get_player_by_name(self.driver)
if driver_objref then
local ctrl = driver_objref:get_player_control()
if ctrl.left then
if self.rot == 0 then
self.rot = TINIT
else
self.rot = self.rot + TACC
end
noturnctrl = false
elseif ctrl.right then
if self.rot == 0 then
self.rot = -TINIT
else
self.rot = self.rot - TACC
end
noturnctrl = false
end
if AVIEW then
driver_objref:set_look_horizontal(get_theta(vel))
end
else
-- Player left server while driving
-- In MT 5.0.0 use 'airboat:on_detach_child()' to do this
self.driver = nil
end
end
-- If no turn control adjust turn towards zero
local sr = get_sign(self.rot)
if noturnctrl and touch then
self.rot = self.rot - TDEC * sr
if sr ~= get_sign(self.rot) then
self.rot = 0
end
end
-- Limit turn
if math.abs(self.rot) > TMAX then
self.rot = TMAX * get_sign(self.rot)
end
-- Acceleration caused by 4 Forces
-- 1. Drag is proportional to velocity, assuming laminar flow
local dragacc = vector.multiply(vel, -DRAG)
-- 2. Rolling resistence is constant
local rraccmag = 0
if touch then
if linvel > 0 then
rraccmag = -ROLRES
elseif linvel < 0 then
rraccmag = ROLRES
end
end
--local rracc = get_veccomp(rraccmag, self.object:getyaw(), 0)
-- 3. Wheel torque acceleration
--local tacc = get_veccomp(taccmag, self.object:getyaw(), 0)
-- Combine taccmag and rraccmag since same direction
local trracc = get_veccomp(taccmag + rraccmag, self.object:getyaw(), 0)
-- 4. Tire lateral friction
-- Velocity component lateral to car
local tlfacc = {x = 0, y = 0, z = 0}
if touch then
local latvel = math.sin(yawrtvel) * velmag
local tlfaccmag = math.min(math.max(latvel * 32, -GRIP), GRIP)
tlfacc = get_veccomp(tlfaccmag, self.object:getyaw() + math.pi / 2, 0)
-- Tire smoke
if self.driver and math.random() < -0.05 + math.abs(latvel) / 30 then
local opos = self.object:getpos()
opos.y = opos.y - 0.5
local yaw = self.object:getyaw()
local yaw1 = yaw + math.pi * 0.25
local yaw2 = yaw + math.pi * 0.75
local srcomp1x = -math.sin(yaw1)
local srcomp1z = math.cos(yaw1)
local srcomp2x = -math.sin(yaw2)
local srcomp2z = math.cos(yaw2)
add_smoke_particle({
x = opos.x + srcomp1x,
y = opos.y,
z = opos.z + srcomp1z
}, self.driver)
add_smoke_particle({
x = opos.x - srcomp1x,
y = opos.y,
z = opos.z - srcomp1z
}, self.driver)
add_smoke_particle({
x = opos.x + srcomp2x,
y = opos.y,
z = opos.z + srcomp2z
}, self.driver)
add_smoke_particle({
x = opos.x - srcomp2x,
y = opos.y,
z = opos.z - srcomp2z
}, self.driver)
end
end
local new_acc = {
x = trracc.x + dragacc.x + tlfacc.x,
y = trracc.y + dragacc.y + tlfacc.y - GRAV,
z = trracc.z + dragacc.z + tlfacc.z,
}
-- Turn multiplier
local turm = 1
-- Reduce turn below 4nps
if velmag < 4 then
turm = velmag / 4
end
-- Limit dtime to avoid too much turn
dtime = math.min(dtime, 0.2)
self.object:setpos(self.object:getpos())
self.object:setvelocity(self.object:getvelocity())
self.object:setacceleration(new_acc)
self.object:setyaw(wrap_yaw(self.object:getyaw() + self.rot * dtime * turm))
end
-- Register entity
minetest.register_entity("driftcar:driftcar" .. name, car)
-- Craftitem
minetest.register_craftitem("driftcar:driftcar" .. name, {
description = "Drift Car" .. name,
inventory_image = "cars.png^[colorize:#"..colour..":70",
wield_image = "none.png",
wield_scale = {x = 2, y = 2, z = 2},
on_place = function(itemstack, placer, pointed_thing)
local under = pointed_thing.under
local node = minetest.get_node(under)
local udef = minetest.registered_nodes[node.name]
-- Run any on_rightclick function of pointed node instead
if udef and udef.on_rightclick and
not (placer and placer:is_player() and
placer:get_player_control().sneak) then
return udef.on_rightclick(under, node, placer, itemstack,
pointed_thing) or itemstack
end
if pointed_thing.type ~= "node" then
return itemstack
end
pointed_thing.under.y = pointed_thing.under.y + 1.25
local car = minetest.add_entity(pointed_thing.under,
"driftcar:driftcar" .. name)
if car then
if placer then
car:setyaw(placer:get_look_horizontal())
end
local player_name = placer and placer:get_player_name() or ""
if not (creative and creative.is_enabled_for and
creative.is_enabled_for(player_name)) then
itemstack:take_item()
end
end
return itemstack
end,
})
-- Nodebox
minetest.register_node("driftcar:driftcar_nodebox" ..name, {
description = "Drift Car Nodebox" ..name,
tiles = { -- Top, base, right, left, front, back
"driftcar_top.png^[colorize:#"..colour..":70",
"driftcar_base.png^[colorize:#"..colour..":70",
"driftcar_right.png^[colorize:#"..colour..":70",
"driftcar_left.png^[colorize:#"..colour..":70",
"driftcar_front.png^[colorize:#"..colour..":70",
"driftcar_back.png^[colorize:#"..colour..":70",
},
paramtype = "light",
drawtype = "nodebox",
node_box = {
type = "fixed",
fixed = { -- Widmin, heimin, lenmin, widmax, heimax, lenmax
{-0.5, 0.125, -0.5, 0.5, 0.5, 0.4375}, -- Upper
{-0.5, -0.375, -0.5, 0.5, 0.125, 0.5}, -- Lower
{-0.5, -0.5, -0.5, -0.3125, -0.375, -0.1875}, -- Wheels
{0.3125, -0.5, -0.5, 0.5, -0.375, -0.1875},
{-0.5, -0.5, 0.1875, -0.3125, -0.375, 0.5},
{0.3125, -0.5, 0.1875, 0.5, -0.375, 0.5},
},
},
groups = {not_in_creative_inventory = 1},
})
end