forked from mtcontrib/hangglider
223 lines
7.5 KiB
Lua
223 lines
7.5 KiB
Lua
-- Hangglider mod for Minetest
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-- Original code by Piezo_ (orderofthefourthwall@gmail.com)
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-- 2018-11-14
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-- Modifications by David G (kestral246@gmail.com)
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-- 2018-11-24
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-- For Minetest 5.x, glider's set_attach needs to be offset by 1 node
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-- Switch to alternate commented line below with correct offset.
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-- Additional tuning of parameters.
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-- Commented out debug hud display code, prefixed with "--debug:".
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-- 2018-11-22
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-- Give visual indication that hangglider is equiped.
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-- Display simple overlay with blurred struts when equiped.
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-- Issue: don't know how to disable overlay in third person view.
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-- Also Unequip hangglider when landing on water.
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-- Attempt to linearize parabolic flight path.
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-- Start gravity stronger, but gradually reduce it as descent velocity increases.
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-- Don't use airstopper when equipped from the ground (descent velocity is low).
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-- Slightly increase flight speed to 1.25.
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-- Unequip/equip cycling mid-flight should not fly farther than continuous flight.
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-- When equipping mid-air (descent velocity higher), use airstopper but increase descent slope afterwards.
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-- Create airbreak flag so all equips mid-flight use faster descent.
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-- Reset airbreak flag only when land (canExist goes false).
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-- Issue: it wouldn't reset if land in water, use fly, and launch from air, before I added test for water,
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-- not sure if there are other such cases.
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-- Temporarily add hud debug display to show descent velocity, gravity override, and airbreak flag.
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-- Still in process of tuning all the parameters.
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-- Modifications by Piezo_
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-- 2018-11-25
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-- hud overlay and debug can be enabled/disabled
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-- Added blender-rendered overlay for struts using the actual model.
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-- Reduced airbreak penalty severity
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-- gave glider limited durability.
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-- Improved gravity adjustment function.
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-- Changed airbreaking process
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-- Removed airbreak penalty, as any 'advantage' seems minimal after new adjustments
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local HUD_Overlay = true --show glider struts as overlay on HUD
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local debug = false --show debug info in top-center of hud
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hangglider = {} --Make this global, so other mods can tell if hangglider exists.
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hangglider.use = {}
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if HUD_Overlay then
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hangglider.id = {} -- hud id for displaying overlay with struts
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end
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if debug then hangglider.debug = {} end -- hud id for debug data
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--hangglider.airbreak = {} -- true if falling fast when equip
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minetest.register_entity("hangglider:airstopper", { --A one-instant entity that catches the player and stops them.
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is_visible = false,
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physical = false,
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immortal = true,
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attach = nil,
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on_step = function(self, _)
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local canExist = false
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if self.attach then
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local player = self.attach
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if player:is_player() then
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local pname = player:get_player_name()
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canExist = true
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if player:get_player_velocity().y < 0.5 and player:get_player_velocity().y > -0.5 then
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--Let go when the player actually stops, as that's the whole point.
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if hangglider.use[pname] then
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minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
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end
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canExist = false
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end
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end
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if not canExist then
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self.attach:set_detach()
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end
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end
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if not canExist then
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self.object:remove()
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end
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end
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})
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minetest.register_entity("hangglider:glider", {
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visual = "mesh",
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visual_size = {x = 12, y = 12},
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mesh = "glider.obj",
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immortal = true,
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static_save = false,
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textures = {"wool_white.png","default_wood.png"},
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on_step = function(self, _)
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local canExist = false
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if self.object:get_attach() then
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local player = self.object:get_attach("parent")
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if player then
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local pos = player:getpos()
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local pname = player:get_player_name()
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if hangglider.use[pname] then
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local mrn_name = minetest.registered_nodes[minetest.get_node(vector.new(pos.x, pos.y-0.5, pos.z)).name]
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if mrn_name then
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if not (mrn_name.walkable or (mrn_name.drowning and mrn_name.drowning == 1)) then
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canExist = true
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local vel = player:get_player_velocity()
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if debug then player:hud_change(hangglider.debug[pname].id, "text", vel.y..', '..grav..', '..tostring(hangglider.airbreak[pname])) end
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player:set_physics_override({gravity = (vel.y + 2.0)/20})
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end
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end
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end
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if not canExist then
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player:set_physics_override({
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gravity = 1,
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jump = 1,
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speed = 1,
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})
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hangglider.use[pname] = false
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if HUD_Overlay then
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player:hud_change(hangglider.id[pname], "text", "blank.png")
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end
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--hangglider.airbreak[pname] = false
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end
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end
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end
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if not canExist then
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self.object:set_detach()
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self.object:remove()
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end
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end
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})
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minetest.register_on_dieplayer(function(player)
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player:set_physics_override({
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gravity = 1,
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jump = 1,
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})
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hangglider.use[player:get_player_name()] = false
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end)
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minetest.register_on_joinplayer(function(player)
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local pname = player:get_player_name()
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player:set_physics_override({
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gravity = 1,
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jump = 1,
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})
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hangglider.use[pname] = false
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if HUD_Overlay then
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hangglider.id[pname] = player:hud_add({
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hud_elem_type = "image",
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text = "blank.png",
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position = {x=0, y=0},
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scale = {x=-100, y=-100},
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alignment = {x=1, y=1},
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offset = {x=0, y=0}
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}) end
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if debug then
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hangglider.debug[pname] = {id = player:hud_add({hud_elem_type = "text",
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position = {x=0.5, y=0.1},
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text = "-",
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number = 0xFF0000}), -- red text
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-- ht = {50,50,50},
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}
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end
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--hangglider.airbreak[pname] = false
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end)
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minetest.register_on_leaveplayer(function(player)
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local pname = player:get_player_name()
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hangglider.use[pname] = nil
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if HUD_Overlay then hangglider.id[pname] = nil end
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if debug then hangglider.debug[pname] = nil end
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--hangglider.airbreak[pname] = nil
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end)
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minetest.register_tool("hangglider:hangglider", {
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description = "Glider",
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inventory_image = "glider_item.png",
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stack_max=1,
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on_use = function(itemstack, user, pointed_thing)
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if not user then
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return
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end
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local pos = user:get_pos()
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local pname = user:get_player_name()
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if minetest.get_node(pos).name == "air" and not hangglider.use[pname] then --Equip
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minetest.sound_play("bedsheet", {pos=pos, max_hear_distance = 8, gain = 1.0})
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if HUD_Overlay then user:hud_change(hangglider.id[pname], "text", "glider_struts.png") end
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local airbreak = false
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local vel = user:get_player_velocity().y
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if vel < -1.5 then -- engage mid-air, falling fast, so stop but ramp velocity more quickly
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--hangglider.airbreak[pname] = true
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airbreak = true
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local stopper = minetest.add_entity(pos, "hangglider:airstopper")
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stopper:get_luaentity().attach = user
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user:set_attach( stopper, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
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end
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user:set_physics_override({gravity = 0,jump=0,speed=1.75})
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if not airbreak then
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minetest.add_entity(user:get_pos(), "hangglider:glider"):set_attach(user, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
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end
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hangglider.use[pname] = true
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-- if minetest 0.4.x use this:
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-- if minetest 5.x use this:
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-- minetest.add_entity(user:get_pos(), "hangglider:glider"):set_attach(user, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
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itemstack:set_wear(itemstack:get_wear() + 255)
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return itemstack
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elseif hangglider.use[pname] then --Unequip
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if HUD_Overlay then user:hud_change(hangglider.id[pname], "text", "blank.png") end
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hangglider.use[pname] = false
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end
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end,
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sound = {breaks = "default_tool_breaks"},
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})
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minetest.register_craft({
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output = "hangglider:hangglider",
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recipe = {
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{"wool:white", "wool:white", "wool:white"},
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{"default:stick", "", "default:stick"},
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{"", "default:stick", ""},
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}
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})
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