1 -- Hangglider mod for Minetest
2 -- Original code by Piezo_ (orderofthefourthwall@gmail.com)
5 -- Modifications by David G (kestral246@gmail.com)
7 -- For Minetest 5.x, glider's set_attach needs to be offset by 1 node
8 -- Switch to alternate commented line below with correct offset.
9 -- Additional tuning of parameters.
10 -- Commented out debug hud display code, prefixed with "--debug:".
13 -- Give visual indication that hangglider is equiped.
14 -- Display simple overlay with blurred struts when equiped.
15 -- Issue: don't know how to disable overlay in third person view.
16 -- Also Unequip hangglider when landing on water.
17 -- Attempt to linearize parabolic flight path.
18 -- Start gravity stronger, but gradually reduce it as descent velocity increases.
19 -- Don't use airstopper when equipped from the ground (descent velocity is low).
20 -- Slightly increase flight speed to 1.25.
21 -- Unequip/equip cycling mid-flight should not fly farther than continuous flight.
22 -- When equipping mid-air (descent velocity higher), use airstopper but increase descent slope afterwards.
23 -- Create airbreak flag so all equips mid-flight use faster descent.
24 -- Reset airbreak flag only when land (canExist goes false).
25 -- Issue: it wouldn't reset if land in water, use fly, and launch from air, before I added test for water,
26 -- not sure if there are other such cases.
27 -- Temporarily add hud debug display to show descent velocity, gravity override, and airbreak flag.
28 -- Still in process of tuning all the parameters.
31 -- Modifications by Piezo_
33 -- hud overlay and debug can be enabled/disabled
34 -- Added blender-rendered overlay for struts using the actual model.
35 -- Reduced airbreak penalty severity
36 -- gave glider limited durability.
37 -- Improved gravity adjustment function.
38 -- Changed airbreaking process
39 -- Removed airbreak penalty, as any 'advantage' seems minimal after new adjustments
40 -- Removed airbreak until minetest devs are smart enough to implement better serverside players.
41 -- Simplified liquid check.
43 -- Modifications by gpcf
45 -- get shot down while flying over protected areas marked as no-fly-zones (flak, from German Flugabwehrkanone)
46 -- set these areas with the /area_flak command
48 -- Modifications by SpaghettiToastBook
50 -- Physics overrides use player_monoids mod if available
54 local HUD_Overlay = true --show glider struts as overlay on HUD
55 local debug = false --show debug info in top-center of hud
56 local moveModelUp = false
57 if tonumber(string.sub(minetest.get_version().string, 1, 1)) and tonumber(string.sub(minetest.get_version().string, 1, 1)) > 4 then
60 hangglider = {} --Make this global, so other mods can tell if hangglider exists.
63 hangglider.id = {} -- hud id for displaying overlay with struts
65 if debug then hangglider.debug = {} end -- hud id for debug data
66 --hangglider.airbreak = {} -- true if falling fast when equip
68 minetest.register_entity("hangglider:airstopper", { --A one-instant entity that catches the player and stops them.
73 on_step = function(self, _)
74 local canExist = false
76 local player = self.attach
77 if player:is_player() then
78 local pname = player:get_player_name()
80 if player:get_player_velocity().y < 0.5 and player:get_player_velocity().y > -0.5 then
81 --Let go when the player actually stops, as that's the whole point.
82 if hangglider.use[pname] then
84 minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
86 minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
103 hangglider.flak = true
104 -- chat command definition essentially copied from areas mod.
105 minetest.register_chatcommand("area_flak",{
107 description = "Toggle airspace restrictions for area <ID>",
108 func = function(name, param)
109 local id = tonumber(param)
111 return false, "Invalid usage, see /help area_flak."
114 if not areas:isAreaOwner(id, name) then
115 return false, "Area "..id.." does not exist"
116 .." or is not owned by you."
118 local open = not areas.areas[id].flak
119 -- Save false as nil to avoid inflating the DB.
120 areas.areas[id].flak = open or nil
122 return true, ("Area's airspace %s."):format(open and "closed" or "opened")
127 if minetestd and minetestd.services.gravityctl.enabled then
128 minetestd.gravityctl.register_gravity_effect("hangglider",
130 return hangglider.use[player:get_player_name()]
132 function(gravity, player)
133 local vel = player:get_player_velocity()
134 if debug then player:hud_change(hangglider.debug[pname].id, "text", vel.y..', '..player:get_physics_override().gravity..', '..tostring(hangglider.airbreak[pname])) end
135 return ((vel.y + 3)/20)
142 hangglider.can_fly = function (pname, pos)
143 -- Checks if the player will get shot down at the position
145 local zone = wardzones.getZone(pos)
147 return (minetest.check_player_privs(pname, {protection_bypass=true}) or wardzones.checkPlayerZoneAccess(pname, zone) or not zone["data"]["no_fly"])
150 if areas and minetest.is_protected(vector.round(pos), pname) then
151 if hangglider.flak then
152 for id, area in pairs(areas:getAreasAtPos(pos)) do
162 hangglider.shot_sound = function (pos)
163 minetest.sound_play("hangglider_flak_shot", {
165 max_hear_distance = 30,
170 local physics_attrs = {"jump", "speed", "gravity"}
171 local function apply_physics_override(player, overrides)
172 if player_monoids then
173 for _, attr in pairs(physics_attrs) do
174 if overrides[attr] then
175 player_monoids[attr]:add_change(player, overrides[attr], "hangglider:glider")
179 player:set_physics_override(overrides)
183 local function remove_physics_override(player, overrides)
184 for _, attr in pairs(physics_attrs) do
185 if overrides[attr] then
186 if player_monoids then
187 player_monoids[attr]:del_change(player, "hangglider:glider")
189 player:set_physics_override({[attr] = 1})
196 minetest.register_entity("hangglider:glider", {
198 visual_size = {x = 12, y = 12},
202 textures = {"wool_white.png","default_wood.png"},
203 on_step = function(self, dtime)
204 local canExist = false
205 if self.object:get_attach() then
206 local player = self.object:get_attach("parent")
208 local pos = player:getpos()
209 local pname = player:get_player_name()
210 if hangglider.use[pname] then
211 local mrn_name = minetest.registered_nodes[minetest.get_node(vector.new(pos.x, pos.y-0.5, pos.z)).name]
213 if not (mrn_name.walkable or mrn_name.liquidtype ~= "none") then
215 step_v = player:get_player_velocity().y
216 if step_v < 0 and step_v > -3 then
217 apply_physics_override(player, {speed=math.abs(step_v/2) + 0.75})
218 elseif step_v <= -3 then --Cap our gliding movement speed.
219 apply_physics_override(player, {speed=2.25})
221 remove_physics_override(player, {speed=1})
223 if not minetestd then
224 if debug then player:hud_change(hangglider.debug[pname].id, "text", step_v..', '..player:get_physics_override().gravity..', '..tostring(hangglider.airbreak[pname])) end
225 apply_physics_override(player, {gravity=((step_v + 3)/20)})
227 --[[local vel = player:get_player_velocity()
228 if debug then player:hud_change(hangglider.debug[pname].id, "text", vel.y..', '..grav..', '..tostring(hangglider.airbreak[pname])) end
230 player:set_physics_override({gravity = (vel.y + 2.0)/20})
234 if not hangglider.can_fly(pname,pos) then
235 if not self.warned then -- warning shot
237 hangglider.shot_sound(pos)
238 minetest.chat_send_player(pname, "Protected area! You will be shot down in two seconds by anti-aircraft guns!")
240 self.warned = self.warned + dtime
241 if self.warned > 2 then -- shoot down
243 player:get_inventory():remove_item("main", ItemStack("hangglider:hangglider"))
244 hangglider.shot_sound(pos)
249 remove_physics_override(player, {
253 if not minetestd then
254 remove_physics_override(player, {gravity=1})
256 hangglider.use[pname] = false
258 player:hud_change(hangglider.id[pname], "text", "blank.png")
260 --hangglider.airbreak[pname] = false
265 self.object:set_detach()
271 minetest.register_on_dieplayer(function(player)
272 remove_physics_override(player, {
276 hangglider.use[player:get_player_name()] = false
280 minetest.register_on_joinplayer(function(player)
281 local pname = player:get_player_name()
282 remove_physics_override(player, {
286 hangglider.use[pname] = false
288 hangglider.id[pname] = player:hud_add({
289 hud_elem_type = "image",
291 position = {x=0, y=0},
292 scale = {x=-100, y=-100},
293 alignment = {x=1, y=1},
297 hangglider.debug[pname] = {id = player:hud_add({hud_elem_type = "text",
298 position = {x=0.5, y=0.1},
300 number = 0xFF0000}), -- red text
304 --hangglider.airbreak[pname] = false
307 minetest.register_on_leaveplayer(function(player)
308 local pname = player:get_player_name()
309 hangglider.use[pname] = nil
310 if HUD_Overlay then hangglider.id[pname] = nil end
311 if debug then hangglider.debug[pname] = nil end
312 --hangglider.airbreak[pname] = nil
315 minetest.register_tool("hangglider:hangglider", {
316 description = "Glider",
317 inventory_image = "glider_item.png",
319 on_use = function(itemstack, player, pointed_thing)
323 local pos = player:get_pos()
324 local pname = player:get_player_name()
325 if not hangglider.use[pname] then --Equip
326 minetest.sound_play("bedsheet", {pos=pos, max_hear_distance = 8, gain = 1.0})
327 if HUD_Overlay then player:hud_change(hangglider.id[pname], "text", "glider_struts.png") end
328 local airbreak = false
329 local vel = player:get_player_velocity().y
330 --[[if vel < -1.5 then -- engage mid-air, falling fast, so stop but ramp velocity more quickly
331 --hangglider.airbreak[pname] = true
333 local stopper = minetest.add_entity(pos, "hangglider:airstopper")
334 minetest.after(0, function(stopper, player) --"Extreme Measures"
335 stopper:set_pos(player:get_pos())
336 stopper:get_luaentity().attach = player
337 player:set_attach( stopper, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
338 end, stopper, player)
342 minetest.add_entity(pos, "hangglider:glider"):set_attach(player, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
344 minetest.add_entity(pos, "hangglider:glider"):set_attach(player, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
347 hangglider.use[pname] = true
348 apply_physics_override(player, {jump = 0})
349 -- if minetest 0.4.x use this:
351 -- if minetest 5.x use this:
352 -- minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
353 itemstack:set_wear(itemstack:get_wear() + 255)
355 elseif hangglider.use[pname] then --Unequip
356 if HUD_Overlay then player:hud_change(hangglider.id[pname], "text", "default_wood.png^[colorize:#0000:255") end
357 hangglider.use[pname] = false
360 sound = {breaks = "default_tool_breaks"},
363 minetest.register_craft({
365 output = "hangglider:hangglider",
366 recipe = {"default:paper", "default:paper", "default:paper", "default:paper", "hangglider:hangglider", "default:paper", "default:paper", "default:paper", "default:paper"},
369 minetest.register_craft({
370 output = "hangglider:hangglider",
372 {"wool:white", "wool:white", "wool:white"},
373 {"default:stick", "", "default:stick"},
374 {"", "default:stick", ""},