218 lines
8.5 KiB
Lua
218 lines
8.5 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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-- Removed airbreak until minetest devs are smart enough to implement better serverside players.
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-- Simplified liquid check.
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-- Modifications by gpcf
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-- 2018-12-09
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-- get shot down while flying over protected areas marked as no-fly-zones (flak, from German Flugabwehrkanone)
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-- set these areas with the /area_flak command
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-- Modifications by SpaghettiToastBook
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-- 2018-12-29
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-- Physics overrides use player_monoids mod if available
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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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hangglider.players = {}
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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
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hangglider.debug = {} -- hud id for debug data
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end
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local physics_attrs = {"jump", "speed", "gravity"}
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local function apply_physics_override(player, overrides)
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player:set_physics_override(overrides)
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end
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local function remove_physics_override(player, overrides)
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for _, attr in pairs(physics_attrs) do
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if overrides[attr] then
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player:set_physics_override({[attr] = 1})
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end
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end
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end
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local step_v
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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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collisionbox = {0,0,0,0,0,0},
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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.png","default_wood.png"},
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on_step = function(self, dtime)
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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:get_pos()
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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.liquidtype ~= "none") then
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canExist = true
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step_v = player:get_velocity().y
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if step_v < 0 and step_v > -3 then
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apply_physics_override(player, {speed=math.abs(step_v/2) + 0.75})
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elseif step_v <= -3 then --Cap our gliding movement speed.
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apply_physics_override(player, {speed=2.25})
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else
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remove_physics_override(player, {speed=1})
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end
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if debug then player:hud_change(hangglider.debug[pname].id, "text", step_v..', '..player:get_physics_override().gravity..', '..tostring(hangglider.airbreak[pname])) end
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apply_physics_override(player, {gravity=((step_v + 3)/20)})
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end
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--[[local vel = player:get_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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]]
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end
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end
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if not canExist then --Landed, reset player physics and stuff.
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hangglider.use[pname] = false
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armor:set_player_armor(player)
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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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remove_physics_override(player, {
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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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remove_physics_override(player, {
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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, player, pointed_thing)
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if not player then
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return
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end
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local pos = player:get_pos()
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local pname = player:get_player_name()
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hangglider.players[pname] = player:get_physics_override()
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if 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 player:hud_change(hangglider.id[pname], "text", "glider_struts.png") end
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local airbreak = false
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local vel = player:get_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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minetest.after(0, function(stopper, player) --"Extreme Measures"
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stopper:set_pos(player:get_pos())
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stopper:get_luaentity().attach = player
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player:set_attach( stopper, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
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end, stopper, player)
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end]]
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if not airbreak then
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minetest.add_entity(pos, "hangglider:glider"):set_attach(player, "", {x=0,y=10,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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apply_physics_override(player, {jump = 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 player:hud_change(hangglider.id[pname], "text", "default_wood.png^[colorize:#0000:255") 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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