minetest-mm/mods/lib_mount/init.lua

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--[[
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An API framework for mounting objects.
Copyright (C) 2016 blert2112 and contributors
Copyright (C) 2019-2021 David Leal (halfpacho@gmail.com) and contributors
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
USA
--]]
lib_mount = {
passengers = {}
}
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local crash_threshold = 6.5 -- ignored if enable_crash is disabled
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------------------------------------------------------------------------------
local mobs_redo = false
if minetest.get_modpath("mobs") then
if mobs.mod and mobs.mod == "redo" then
mobs_redo = true
end
end
--
-- Helper functions
--
--local function is_group(pos, group)
-- local nn = minetest.get_node(pos).name
-- return minetest.get_item_group(nn, group) ~= 0
--end
local function node_is(pos)
local node = minetest.get_node(pos)
if node.name == "air" then
return "air"
end
if minetest.get_item_group(node.name, "liquid") ~= 0 then
return "liquid"
end
if minetest.get_item_group(node.name, "walkable") ~= 0 then
return "walkable"
end
return "other"
end
local function get_sign(i)
i = i or 0
if i == 0 then
return 0
else
return i / math.abs(i)
end
end
local function get_velocity(v, yaw, y)
local x = -math.sin(yaw) * v
local z = math.cos(yaw) * v
return {x = x, y = y, z = z}
end
local function get_v(v)
return math.sqrt(v.x ^ 2 + v.z ^ 2)
end
local function force_detach(player)
local attached_to = player:get_attach()
if attached_to then
local entity = attached_to:get_luaentity()
if entity.driver and entity.driver == player then
entity.driver = nil
elseif entity.passenger and entity.passenger == player then
entity.passenger = nil
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lib_mount.passengers[player] = nil
elseif entity.passenger2 and entity.passenger2 == player then
entity.passenger2 = nil
lib_mount.passengers[player] = nil
elseif entity.passenger3 and entity.passenger3 == player then
entity.passenger3 = nil
lib_mount.passengers[player] = nil
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end
player:set_detach()
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player_api.player_attached[player:get_player_name()] = false
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player:set_eye_offset({x=0, y=0, z=0}, {x=0, y=0, z=0})
end
end
-------------------------------------------------------------------------------
minetest.register_on_leaveplayer(function(player)
force_detach(player)
end)
minetest.register_on_shutdown(function()
local players = minetest.get_connected_players()
for i = 1,#players do
force_detach(players[i])
end
end)
minetest.register_on_dieplayer(function(player)
force_detach(player)
return true
end)
-------------------------------------------------------------------------------
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function lib_mount.attach(entity, player, is_passenger, passenger_number)
local attach_at, eye_offset = {}, {}
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if not is_passenger then
passenger_number = nil
end
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if not entity.player_rotation then
entity.player_rotation = {x=0, y=0, z=0}
end
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local rot_view = 0
if entity.player_rotation.y == 90 then
rot_view = math.pi/2
end
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if is_passenger == true and passenger_number == 1 then
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if not entity.passenger_attach_at then
entity.passenger_attach_at = {x=0, y=0, z=0}
end
if not entity.passenger_eye_offset then
entity.passenger_eye_offset = {x=0, y=0, z=0}
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end
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attach_at = entity.passenger_attach_at
eye_offset = entity.passenger_eye_offset
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entity.passenger = player
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lib_mount.passengers[entity.passenger] = player
elseif is_passenger == true and passenger_number == 2 then
if not entity.passenger2_attach_at then
entity.passenger2_attach_at = {x=0, y=0, z=0}
end
if not entity.passenger2_eye_offset then
entity.passenger2_eye_offset = {x=0, y=0, z=0}
end
attach_at = entity.passenger2_attach_at
eye_offset = entity.passenger2_eye_offset
entity.passenger2 = player
lib_mount.passengers[entity.passenger2] = player
elseif is_passenger == true and passenger_number == 3 then
if not entity.passenger3_attach_at then
entity.passenger3_attach_at = {x=0, y=0, z=0}
end
if not entity.passenger3_eye_offset then
entity.passenger3_eye_offset = {x=0, y=0, z=0}
end
attach_at = entity.passenger3_attach_at
eye_offset = entity.passenger3_eye_offset
entity.passenger3 = player
lib_mount.passengers[entity.passenger3] = player
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else
if not entity.driver_attach_at then
entity.driver_attach_at = {x=0, y=0, z=0}
end
if not entity.driver_eye_offset then
entity.driver_eye_offset = {x=0, y=0, z=0}
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end
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attach_at = entity.driver_attach_at
eye_offset = entity.driver_eye_offset
entity.driver = player
end
force_detach(player)
player:set_attach(entity.object, "", attach_at, entity.player_rotation)
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player_api.player_attached[player:get_player_name()] = true
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player:set_eye_offset(eye_offset, {x=0, y=0, z=0})
minetest.after(0.2, function()
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player_api.set_animation(player, "sit", 30)
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end)
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player:set_look_horizontal(entity.object:get_yaw() - rot_view)
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end
function lib_mount.detach(player, offset)
force_detach(player)
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player_api.set_animation(player, "stand", 30)
local pos = player:get_pos()
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pos = {x = pos.x + offset.x, y = pos.y + 0.2 + offset.y, z = pos.z + offset.z}
minetest.after(0.1, function()
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player:set_pos(pos)
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end)
end
local aux_timer = 0
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function lib_mount.drive(entity, dtime, is_mob, moving_anim, stand_anim, jump_height, can_fly, can_go_down, can_go_up, enable_crash)
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aux_timer = aux_timer + dtime
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if can_fly and can_fly == true then
jump_height = 0
end
local rot_steer, rot_view = math.pi/2, 0
if entity.player_rotation.y == 90 then
rot_steer, rot_view = 0, math.pi/2
end
local acce_y = 0
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local velo = entity.object:get_velocity()
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entity.v = get_v(velo) * get_sign(entity.v)
-- process controls
if entity.driver then
local ctrl = entity.driver:get_player_control()
if ctrl.aux1 then
if aux_timer >= 0.2 then
entity.mouselook = not entity.mouselook
aux_timer = 0
end
end
if ctrl.up then
if get_sign(entity.v) >= 0 then
entity.v = entity.v + entity.accel/10
else
entity.v = entity.v + entity.braking/10
end
elseif ctrl.down then
if entity.max_speed_reverse == 0 and entity.v == 0 then return end
if get_sign(entity.v) < 0 then
entity.v = entity.v - entity.accel/10
else
entity.v = entity.v - entity.braking/10
end
end
if entity.mouselook then
if ctrl.left then
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entity.object:set_yaw(entity.object:get_yaw()+get_sign(entity.v)*math.rad(1+dtime)*entity.turn_spd)
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elseif ctrl.right then
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entity.object:set_yaw(entity.object:get_yaw()-get_sign(entity.v)*math.rad(1+dtime)*entity.turn_spd)
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end
else
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entity.object:set_yaw(entity.driver:get_look_yaw() - rot_steer)
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end
if ctrl.jump then
if jump_height > 0 and velo.y == 0 then
velo.y = velo.y + (jump_height * 3) + 1
acce_y = acce_y + (acce_y * 3) + 1
end
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if can_go_down and can_go_up and can_fly and can_fly == true then
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velo.y = velo.y + 1
acce_y = acce_y + 1
end
end
if ctrl.sneak then
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if can_go_down and can_go_up and can_fly and can_fly == true then
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velo.y = velo.y - 1
acce_y = acce_y - 1
end
end
end
-- if not moving then set animation and return
if entity.v == 0 and velo.x == 0 and velo.y == 0 and velo.z == 0 then
if is_mob and mobs_redo == true then
if stand_anim and stand_anim ~= nil then
set_animation(entity, stand_anim)
end
end
return
end
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-- set animation
if is_mob and mobs_redo == true then
if moving_anim and moving_anim ~= nil then
set_animation(entity, moving_anim)
end
end
-- Stop!
local s = get_sign(entity.v)
entity.v = entity.v - 0.02 * s
if s ~= get_sign(entity.v) then
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entity.object:set_velocity({x=0, y=0, z=0})
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entity.v = 0
return
end
-- enforce speed limit forward and reverse
local max_spd = entity.max_speed_reverse
if get_sign(entity.v) >= 0 then
max_spd = entity.max_speed_forward
end
if math.abs(entity.v) > max_spd then
entity.v = entity.v - get_sign(entity.v)
end
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-- Set position, velocity and acceleration
local p = entity.object:get_pos()
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local new_velo = {x=0, y=0, z=0}
local new_acce = {x=0, y=-9.8, z=0}
p.y = p.y - 0.5
local ni = node_is(p)
local v = entity.v
if ni == "air" then
if can_fly == true then
new_acce.y = 0
end
elseif ni == "liquid" then
if entity.terrain_type == 2 or entity.terrain_type == 3 then
new_acce.y = 0
p.y = p.y + 1
if node_is(p) == "liquid" then
if velo.y >= 5 then
velo.y = 5
elseif velo.y < 0 then
new_acce.y = 20
else
new_acce.y = 5
end
else
if math.abs(velo.y) < 1 then
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local pos = entity.object:get_pos()
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pos.y = math.floor(pos.y) + 0.5
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entity.object:set_pos(pos)
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velo.y = 0
end
end
else
v = v*0.25
end
-- elseif ni == "walkable" then
-- v = 0
-- new_acce.y = 1
end
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new_velo = get_velocity(v, entity.object:get_yaw() - rot_view, velo.y)
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new_acce.y = new_acce.y + acce_y
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entity.object:set_velocity(new_velo)
entity.object:set_acceleration(new_acce)
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-- CRASH!
if enable_crash then
local intensity = entity.v2 - v
if intensity >= crash_threshold then
if is_mob then
entity.object:set_hp(entity.object:get_hp() - intensity)
else
if entity.driver then
local drvr = entity.driver
lib_mount.detach(drvr, {x=0, y=0, z=0})
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drvr:set_velocity(new_velo)
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drvr:set_hp(drvr:get_hp() - intensity)
end
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if entity.passenger then
local pass = entity.passenger
lib_mount.detach(pass, {x=0, y=0, z=0})
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pass:set_velocity(new_velo)
pass:set_hp(pass:get_hp() - intensity)
end
if entity.passenger2 then
local pass = entity.passenger2
lib_mount.detach(pass, {x=0, y=0, z=0})
pass:set_velocity(new_velo)
pass:set_hp(pass:get_hp() - intensity)
end
if entity.passenger3 then
local pass = entity.passenger3
lib_mount.detach(pass, {x=0, y=0, z=0})
pass:set_velocity(new_velo)
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pass:set_hp(pass:get_hp() - intensity)
end
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local pos = entity.object:get_pos()
------------------
-- Handle drops --
------------------
-- `entity.drop_on_destory` is table which stores all the items that will be dropped on destroy.
-- It will drop one of those items, from `1` to the length, or the end of the table.
local i = math.random(1, #entity.drop_on_destroy)
local j = math.random(2, #entity.drop_on_destroy)
minetest.add_item(pos, entity.drop_on_destroy[i])
if i ~= j then
minetest.add_item(pos, entity.drop_on_destroy[j])
end
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entity.removed = true
-- delay remove to ensure player is detached
minetest.after(0.1, function()
entity.object:remove()
end)
end
end
end
entity.v2 = v
end