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hangglider/init.lua

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Lua
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-- Hangglider mod for Minetest
-- Original code by Piezo_ (orderofthefourthwall@gmail.com)
-- 2018-11-14
-- Modifications by David G (kestral246@gmail.com)
-- 2018-11-24
-- For Minetest 5.x, glider's set_attach needs to be offset by 1 node
-- Switch to alternate commented line below with correct offset.
-- Additional tuning of parameters.
-- Commented out debug hud display code, prefixed with "--debug:".
-- 2018-11-22
-- Give visual indication that hangglider is equiped.
-- Display simple overlay with blurred struts when equiped.
-- Issue: don't know how to disable overlay in third person view.
-- Also Unequip hangglider when landing on water.
-- Attempt to linearize parabolic flight path.
-- Start gravity stronger, but gradually reduce it as descent velocity increases.
-- Don't use airstopper when equipped from the ground (descent velocity is low).
-- Slightly increase flight speed to 1.25.
-- Unequip/equip cycling mid-flight should not fly farther than continuous flight.
-- When equipping mid-air (descent velocity higher), use airstopper but increase descent slope afterwards.
-- Create airbreak flag so all equips mid-flight use faster descent.
-- Reset airbreak flag only when land (canExist goes false).
-- Issue: it wouldn't reset if land in water, use fly, and launch from air, before I added test for water,
-- not sure if there are other such cases.
-- Temporarily add hud debug display to show descent velocity, gravity override, and airbreak flag.
-- Still in process of tuning all the parameters.
-- Modifications by Piezo_
-- 2018-11-25
-- hud overlay and debug can be enabled/disabled
-- Added blender-rendered overlay for struts using the actual model.
-- Reduced airbreak penalty severity
-- gave glider limited durability.
local HUD_Overlay = true --show glider struts as overlay on HUD
local debug = false --show debug info in top-center of hud
hangglider = {} --Make this global, so other mods can tell if hangglider exists.
hangglider.use = {}
if HUD_Overlay then
hangglider.id = {} -- hud id for displaying overlay with struts
end
if debug then hangglider.debug = {} end -- hud id for debug data
hangglider.airbreak = {} -- true if falling fast when equip
minetest.register_entity("hangglider:airstopper", { --A one-instant entity that catches the player and slows them down.
hp_max = 3,
is_visible = false,
immortal = true,
attach = nil,
on_step = function(self, _)
if self.object:get_hp() ~= 1 then
self.object:set_hp(self.object:get_hp() - 1)
else
if self.attach then
self.attach:set_detach()
end
self.object:remove()
end
end
})
minetest.register_entity("hangglider:glider", {
visual = "mesh",
visual_size = {x = 12, y = 12},
mesh = "glider.obj",
immortal = true,
static_save = false,
textures = {"wool_white.png","default_wood.png"},
on_step = function(self, _)
local canExist = false
if self.object:get_attach() then
local player = self.object:get_attach("parent")
if player then
local pos = player:getpos()
local pname = player:get_player_name()
if hangglider.use[pname] then
local mrn_name = minetest.registered_nodes[minetest.get_node(vector.new(pos.x, pos.y-0.5, pos.z)).name]
if mrn_name then
if not (mrn_name.walkable or (mrn_name.drowning and mrn_name.drowning == 1)) then
canExist = true
local vel = player:get_player_velocity()
local grav = player:get_physics_override().gravity
if debug then player:hud_change(hangglider.debug[pname].id, "text", vel.y..', '..grav..', '..tostring(hangglider.airbreak[pname])) end
-- If airbreaking used, increase the descent progression to not give
-- mid-flight unequip/equip cycles a distance advantage.
if hangglider.airbreak[pname] then
if vel.y <= -4.0 then
grav = -0.2 --Extreme measures are needed, as sometimes speed will get a bit out of control
elseif vel.y <= -2.0 then
grav = -0.02
elseif vel.y <= -1.75 then
grav = 0.00125 -- *1
elseif vel.y <= -1.5 then
grav = 0.0025 -- *2
elseif vel.y <= -1.25 then
grav = 0.005 -- *2
elseif vel.y <= -1 then
grav = 0.015 -- *3
elseif vel.y <= -0.75 then
grav = 0.04 -- *4
elseif vel.y <= -0.5 then
grav = 0.08 -- *4
elseif vel.y <= -0.25 then
grav = 0.12 -- *3
elseif vel.y <= 0 then
grav = 0.3 -- *3
else -- vel.y > 0
grav = 0.75 -- *1.5
end
else -- normal descent progression
if vel.y <= -4.0 then
grav = -0.2
elseif vel.y <= -2.0 then
grav = -0.02
elseif vel.y <= -1.5 then
grav = 0.00125
elseif vel.y <= -1.25 then
grav = 0.0025
elseif vel.y <= -1 then
grav = 0.005
elseif vel.y <= -0.75 then
grav = 0.01
elseif vel.y <= -0.5 then
grav = 0.02
elseif vel.y <= -0.25 then
grav = 0.04
elseif vel.y <= 0 then
grav = 0.1
else -- vel.y > 0
grav = 0.5
end
end
player:set_physics_override({gravity = grav})
end
end
end
if not canExist then
player:set_physics_override({
gravity = 1,
jump = 1,
speed = 1,
})
hangglider.use[pname] = false
if HUD_Overlay then
player:hud_change(hangglider.id[pname], "text", "blank.png")
end
hangglider.airbreak[pname] = false
end
end
end
if not canExist then
self.object:set_detach()
self.object:remove()
end
end
})
minetest.register_on_dieplayer(function(player)
player:set_physics_override({
gravity = 1,
jump = 1,
})
hangglider.use[player:get_player_name()] = false
end)
minetest.register_on_joinplayer(function(player)
local pname = player:get_player_name()
player:set_physics_override({
gravity = 1,
jump = 1,
})
hangglider.use[pname] = false
if HUD_Overlay then
hangglider.id[pname] = player:hud_add({
hud_elem_type = "image",
text = "blank.png",
position = {x=0, y=0},
scale = {x=-100, y=-100},
alignment = {x=1, y=1},
offset = {x=0, y=0}
}) end
if debug then
hangglider.debug[pname] = {id = player:hud_add({hud_elem_type = "text",
position = {x=0.5, y=0.1},
text = "-",
number = 0xFF0000}), -- red text
-- ht = {50,50,50},
}
end
hangglider.airbreak[pname] = false
end)
minetest.register_on_leaveplayer(function(player)
local pname = player:get_player_name()
hangglider.use[pname] = nil
if HUD_Overlay then hangglider.id[pname] = nil end
if debug then hangglider.debug[pname] = nil end
hangglider.airbreak[pname] = nil
end)
minetest.register_tool("hangglider:hangglider", {
description = "Glider",
inventory_image = "glider_item.png",
stack_max=1,
on_use = function(itemstack, user, pointed_thing)
if not user then
return
end
local pos = user:get_pos()
local pname = user:get_player_name()
if minetest.get_node(pos).name == "air" and not hangglider.use[pname] then --Equip
minetest.sound_play("bedsheet", {pos=pos, max_hear_distance = 8, gain = 1.0})
if HUD_Overlay then user:hud_change(hangglider.id[pname], "text", "glider_struts.png") end
local vel = user:get_player_velocity().y
if vel < -2 then -- engage mid-air, falling fast, so stop but ramp velocity more quickly
hangglider.airbreak[pname] = true
user:set_physics_override({
gravity = 1,
jump = 0,
speed = 1.75,
})
local stopper = minetest.add_entity(pos, "hangglider:airstopper")
stopper:get_luaentity().attach = user
user:set_attach( stopper, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
else
user:set_physics_override({
gravity = 0.02,
jump = 0,
speed = 1.75,
})
end
hangglider.use[pname] = true
-- if minetest 0.4.x use this:
minetest.add_entity(user:get_pos(), "hangglider:glider"):set_attach(user, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
-- if minetest 5.x use this:
-- minetest.add_entity(user:get_pos(), "hangglider:glider"):set_attach(user, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
itemstack:set_wear(itemstack:get_wear() + 255)
return itemstack
elseif hangglider.use[pname] then --Unequip
if HUD_Overlay then user:hud_change(hangglider.id[pname], "text", "blank.png") end
hangglider.use[pname] = false
end
end,
sound = {breaks = "default_tool_breaks"},
})
minetest.register_craft({
output = "hangglider:hangglider",
recipe = {
{"wool:white", "wool:white", "wool:white"},
{"default:stick", "", "default:stick"},
{"", "default:stick", ""},
}
})
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