Camas/mods/parachute/init.lua

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--
-- Parachute mod
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-- By webdesigner97 (license of original mod: WTFPL)
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-- Tweaked by Kaadmy, for Pixture
--
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local S = minetest.get_translator("parachute")
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local function air_physics(v)
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local m = 80 -- Weight of player, kg
local g = -9.81 -- Earth Acceleration, m/s^2
local cw = 1.25 -- Drag coefficient
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local rho = 1.2 -- Density of air (on ground, not accurate), kg/m^3
local A = 25 -- Surface of the parachute, m^2
return ((m * g + 0.5 * cw * rho * A * v * v) / m)
end
minetest.register_craftitem(
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"parachute:parachute", {
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description = S("Parachute"),
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_tt_help = S("Lets you glide safely to the ground when falling"),
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inventory_image = "parachute_inventory.png",
wield_image = "parachute_inventory.png",
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stack_max = 1,
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on_activate = function(self)
self.object:set_armor_groups({immortal=1})
end,
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on_use = function(itemstack, player, pointed_thing)
local name = player:get_player_name()
local pos = player:get_pos()
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local on = minetest.get_node({x = pos.x, y = pos.y - 1, z = pos.z})
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if default.player_attached[name] then
return
end
if on.name == "air" then
-- Spawn parachute
pos.y = pos.y + 3
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local ent = minetest.add_entity(pos, "parachute:entity")
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ent:set_velocity(
{
x = 0,
y = math.min(0, player:get_player_velocity().y),
z = 0
})
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player:set_attach(ent, "", {x = 0, y = -8, z = 0}, {x = 0, y = 0, z = 0})
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ent:set_yaw(player:get_look_horizontal())
ent = ent:get_luaentity()
ent.attached = name
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default.player_attached[player:get_player_name()] = true
if not minetest.settings:get_bool("creative_mode") then
itemstack:take_item()
end
return itemstack
else
minetest.chat_send_player(
player:get_player_name(),
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minetest.colorize("#FFFF00", S("Cannot open parachute on ground!")))
end
end
})
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minetest.register_entity(
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"parachute:entity",
{
visual = "mesh",
mesh = "parachute.b3d",
textures = {"parachute_mesh.png"},
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physical = false,
pointable = false,
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automatic_face_movement_dir = -90,
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attached = nil,
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start_y = nil,
on_activate = function(self, staticdata, dtime_s)
if dtime_s == 0 then
local pos = self.object:get_pos()
self.start_y = pos.y
end
end,
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on_step = function(self, dtime)
local pos = self.object:get_pos()
local under = minetest.get_node({x = pos.x, y = pos.y - 1, z = pos.z})
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if self.attached ~= nil then
local player = minetest.get_player_by_name(self.attached)
local vel = self.object:get_velocity()
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local accel = {x = 0, y = 0, z = 0}
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local lookyaw = math.pi - player:get_look_horizontal()
if lookyaw < 0 then
lookyaw = lookyaw + (math.pi * 2)
end
if lookyaw >= (math.pi * 2) then
lookyaw = lookyaw - (math.pi * 2)
end
-- self.object:set_yaw(lookyaw)
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local s = math.sin(lookyaw)
local c = math.cos(lookyaw)
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local sr = math.sin(lookyaw - (math.pi / 2))
local cr = math.cos(lookyaw - (math.pi / 2))
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local controls = player:get_player_control()
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local speed = 4.0
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if controls.down then
accel.x = s * speed
accel.z = c * speed
elseif controls.up then
accel.x = s * -speed
accel.z = c * -speed
end
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if controls.right then
accel.x = sr * speed
accel.z = cr * speed
elseif controls.left then
accel.x = sr * -speed
accel.z = cr * -speed
end
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accel.y = accel.y + air_physics(vel.y) * 0.25
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self.object:set_acceleration(accel)
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if under.name ~= "air" then
default.player_attached[self.attached] = false
end
end
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if under.name ~= "air" then
if self.attached ~= nil then
default.player_attached[self.attached] = false
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local player = minetest.get_player_by_name(self.attached)
if player and self.start_y ~= nil then
if self.start_y - self.object:get_pos().y > 100 then
achievements.trigger_achievement(player, "sky_diver")
end
end
self.object:set_detach()
end
self.object:remove()
end
end
})
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-- Crafting
crafting.register_craft(
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{
output = "parachute:parachute",
items = {
"group:fuzzy 3",
"default:rope 4",
"default:stick 6",
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}
})
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-- Achievements
achievements.register_achievement(
"sky_diver",
{
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title = S("Skydiver"),
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description = S("Descend over 100 blocks with a parachute."),
times = 1,
})
default.log("mod:parachute", "loaded")