hangglider/init.lua

253 lines
6.9 KiB
Lua

hangglider = {
translator = minetest.get_translator('hangglider'),
}
local S = hangglider.translator
local has_player_monoids = minetest.get_modpath("player_monoids")
local has_areas = minetest.get_modpath("areas")
local enable_hud_overlay = minetest.settings:get_bool("hangglider.enable_hud_overlay", true)
local enable_flak = has_areas and minetest.settings:get_bool("hangglider.enable_flak", true)
local flak_warning_time = tonumber(minetest.settings:get("hangglider.flak_warning_time")) or 2
local hangglider_uses = tonumber(minetest.settings:get("hangglider.uses")) or 250
local flak_warning = S("You have entered restricted airspace!@n"
.. "You will be shot down in @1 seconds by anti-aircraft guns!",
flak_warning_time)
local hanggliding_players = {}
local hud_overlay_ids = {}
if enable_flak then
minetest.register_chatcommand("area_flak", {
params = S("<ID>"),
description = S("Toggle airspace restrictions for area <ID>."),
func = function(name, param)
local id = tonumber(param)
if not id then
return false, S("Invalid usage, see /help area_flak.")
end
if not areas:isAreaOwner(id, name) then
return false, S("Area @1 does not exist or is not owned by you.", id)
end
local open = not areas.areas[id].flak
-- Save false as nil to avoid inflating the DB.
areas.areas[id].flak = open or nil
areas:save()
return true, S("Area @1 airspace is @2.", id,
open and S("closed") or S("opened"))
end
})
end
local function set_hud_overlay(player, name, image)
if not enable_hud_overlay then
return
end
if not hud_overlay_ids[name] then
hud_overlay_ids[name] = player:hud_add({
hud_elem_type = "image",
text = image,
position = {x = 0, y = 0},
scale = {x = -100, y = -100},
alignment = {x = 1, y = 1},
offset = {x = 0, y = 0},
z_index = -150
})
else
player:hud_change(hud_overlay_ids[name], "text", image)
end
end
local function set_physics_overrides(player, overrides)
if has_player_monoids then
for name, value in pairs(overrides) do
player_monoids[name]:add_change(player, value, "hangglider:glider")
end
else
player:set_physics_override(overrides)
end
end
local function remove_physics_overrides(player)
for _, name in pairs({"jump", "speed", "gravity"}) do
if has_player_monoids then
player_monoids[name]:del_change(player, "hangglider:glider")
else
player:set_physics_override({[name] = 1})
end
end
end
local function can_fly(pos, name)
if not enable_flak then
return true
end
local flak = false
local owners = {}
for _, area in pairs(areas:getAreasAtPos(pos)) do
if area.flak then
flak = true
end
owners[area.owner] = true
end
if flak and not owners[name] then
return false
end
return true
end
local function safe_node_below(pos)
local node = minetest.get_node_or_nil(vector.new(pos.x, pos.y - 0.5, pos.z))
if not node then
return false
end
local def = minetest.registered_nodes[node.name]
if def and (def.walkable or (def.liquidtype ~= "none" and def.damage_per_second <= 0)) then
return true
end
return false
end
local function shoot_flak_sound(pos)
minetest.sound_play("hangglider_flak_shot", {
pos = pos,
max_hear_distance = 30,
gain = 10.0,
}, true)
end
local function hangglider_step(self, dtime)
local gliding = false
local player = self.object:get_attach("parent")
if player then
local pos = player:get_pos()
local name = player:get_player_name()
if hanggliding_players[name] then
if not safe_node_below(pos) then
gliding = true
local vel = player:get_velocity().y
if vel < 0 and vel > -3 then
set_physics_overrides(player, {
speed = math.abs(vel / 2.0) + 1.0,
gravity = (vel + 3) / 20,
})
elseif vel <= -3 then
set_physics_overrides(player, {
speed = 2.5,
gravity = -0.1,
})
if vel < -5 then
-- Extra airbrake when falling too fast
player:add_velocity(vector.new(0, math.min(5, math.abs(vel / 10.0)), 0))
end
else -- vel > 0
set_physics_overrides(player, {
speed = 1.0,
gravity = 0.25,
})
end
end
if not can_fly(pos, name) then
if not self.flak_timer then
self.flak_timer = 0
shoot_flak_sound(pos)
minetest.chat_send_player(name, flak_warning)
else
self.flak_timer = self.flak_timer + dtime
end
if self.flak_timer > flak_warning_time then
player:set_hp(1, {type = "set_hp", cause = "hangglider:flak"})
player:get_inventory():remove_item("main", ItemStack("hangglider:hangglider"))
shoot_flak_sound(pos)
gliding = false
end
end
if not gliding then
remove_physics_overrides(player)
hanggliding_players[name] = nil
set_hud_overlay(player, name, "blank.png")
end
end
end
if not gliding then
self.object:set_detach()
self.object:remove()
end
end
local function hangglider_use(stack, player)
if type(player) ~= "userdata" then
return -- Real players only
end
local pos = player:get_pos()
local name = player:get_player_name()
if not hanggliding_players[name] then
minetest.sound_play("hanggliger_equip", {pos = pos, max_hear_distance = 8, gain = 1.0}, true)
local entity = minetest.add_entity(pos, "hangglider:glider")
if entity then
entity:set_attach(player, "", vector.new(0, 10, 0), vector.new(0, 0, 0))
local color = stack:get_meta():get("hangglider_color")
if color then
entity:set_properties({
textures = {"wool_white.png^[multiply:#"..color, "default_wood.png"}
})
end
set_hud_overlay(player, name, "hangglider_overlay.png")
set_physics_overrides(player, {jump = 0, gravity = 0.25})
hanggliding_players[name] = true
if hangglider_uses > 0 then
stack:add_wear(65535 / hangglider_uses)
end
return stack
end
else
set_hud_overlay(player, name, "blank.png")
remove_physics_overrides(player)
hanggliding_players[name] = nil
end
end
minetest.register_on_dieplayer(function(player)
local name = player:get_player_name()
hanggliding_players[name] = nil
remove_physics_overrides(player)
end)
minetest.register_on_leaveplayer(function(player)
local name = player:get_player_name()
hanggliding_players[name] = nil
hud_overlay_ids[name] = nil
remove_physics_overrides(player)
end)
minetest.register_on_player_hpchange(function(player, hp_change, reason)
local name = player:get_player_name()
if hanggliding_players[name] and reason.type == "fall" then
-- Stop all fall damage when hanggliding
return 0, true
end
return hp_change
end, true)
minetest.register_entity("hangglider:glider", {
visual = "mesh",
visual_size = {x = 12, y = 12},
collisionbox = {0,0,0,0,0,0},
mesh = "hangglider.obj",
immortal = true,
static_save = false,
textures = {"wool_white.png", "default_wood.png"},
on_step = hangglider_step,
})
minetest.register_tool("hangglider:hangglider", {
description = S("Glider"),
inventory_image = "hangglider_item.png",
sound = {breaks = "default_tool_breaks"},
on_use = hangglider_use,
})
dofile(minetest.get_modpath("hangglider").."/crafts.lua")