init.lua

   1 -- Hangglider mod for Minetest
   2 -- Original code by Piezo_ (orderofthefourthwall@gmail.com)
   3 -- 2018-11-14
   4
   5 -- Modifications by David G (kestral246@gmail.com)
   6 -- 2018-11-24
   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:".
  11
  12 -- 2018-11-22
  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.
  29
  30
  31 -- Modifications by Piezo_
  32 -- 2018-11-25
  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
  41
  42 local HUD_Overlay = true --show glider struts as overlay on HUD
  43 local debug = false --show debug info in top-center of hud
  44 local moveModelUp = false
  45 if tonumber(string.sub(minetest.get_version().string, 1, 1)) and tonumber(string.sub(minetest.get_version().string, 1, 1)) > 4 then
  46         moveModelUp = true
  47 end
  48 hangglider = {} --Make this global, so other mods can tell if hangglider exists.
  49 hangglider.use = {}
  50 if HUD_Overlay then
  51 hangglider.id = {}  -- hud id for displaying overlay with struts
  52 end
  53 if debug then  hangglider.debug = {} end -- hud id for debug data
  54 --hangglider.airbreak = {}  -- true if falling fast when equip
  55
  56 minetest.register_entity("hangglider:airstopper", { --A one-instant entity that catches the player and stops them.
  57         is_visible = false,
  58         physical = false,
  59         immortal = true,
  60         attach = nil,
  61         on_step = function(self, _)
  62                 local canExist = false
  63                 if self.attach then
  64                         local player = self.attach
  65                         if player:is_player() then
  66                                 local pname = player:get_player_name()
  67                                 canExist = true
  68                                 if player:get_player_velocity().y < 0.5 and player:get_player_velocity().y > -0.5 then
  69                                         --Let go when the player actually stops, as that's the whole point.
  70                                         if hangglider.use[pname] then
  71                                                 if moveModelUp then
  72                                                         minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
  73                                                 else
  74                                                         minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
  75                                                 end
  76                                         end
  77                                         canExist = false
  78                                 end
  79                         end
  80                         if not canExist then
  81                                 player:set_detach()
  82                         end
  83                 end
  84                 if not canExist then
  85                         self.object:remove()
  86                 end
  87         end
  88 })
  89
  90 if minetestd and minetestd.services.gravityctl.enabled then
  91 minetestd.gravityctl.register_gravity_effect("hangglider",
  92         function(player)
  93                 return hangglider.use[player:get_player_name()]
  94         end,
  95         function(gravity, player)
  96                 local vel = player:get_player_velocity()
  97                 if debug then player:hud_change(hangglider.debug[pname].id, "text", vel.y..', '..player:get_physics_override().gravity..', '..tostring(hangglider.airbreak[pname])) end
  98                 return ((vel.y + 3)/20)
  99         end,
 100         7,
 101         1000
 102 )
 103 end
 104
 105 local step_v
 106 minetest.register_entity("hangglider:glider", {
 107         visual = "mesh",
 108         visual_size = {x = 12, y = 12},
 109         mesh = "glider.obj",
 110         immortal = true,
 111         static_save = false,
 112         textures = {"wool_white.png","default_wood.png"},
 113         on_step = function(self, _)
 114                 local canExist = false
 115                 if self.object:get_attach() then
 116                         local player = self.object:get_attach("parent")
 117                         if player then
 118                                 local pos = player:getpos()
 119                                 local pname = player:get_player_name()
 120                                 if hangglider.use[pname] then
 121                                         local mrn_name = minetest.registered_nodes[minetest.get_node(vector.new(pos.x, pos.y-0.5, pos.z)).name]
 122                                         if mrn_name then
 123                                                 if not (mrn_name.walkable or (mrn_name.drowning and mrn_name.drowning == 1)) then
 124                                                         canExist = true
 125                                                         step_v = player:get_player_velocity().y
 126                                                         if step_v < 0 then
 127                                                                 player:set_physics_override({speed=math.abs(step_v/2) + 0.75})
 128                                                         else
 129                                                                 player:set_physics_override({speed=1})
 130                                                         end
 131                                                         if not minetestd then
 132                                                                 if debug then player:hud_change(hangglider.debug[pname].id, "text", step_v..', '..player:get_physics_override().gravity..', '..tostring(hangglider.airbreak[pname])) end
 133                                                                 player:set_physics_override({gravity=((step_v + 3)/20)})
 134                                                         end
 135                                                         --[[local vel = player:get_player_velocity()
 136                                                         if debug then player:hud_change(hangglider.debug[pname].id, "text", vel.y..', '..grav..', '..tostring(hangglider.airbreak[pname])) end
 137
 138                                                         player:set_physics_override({gravity = (vel.y + 2.0)/20})
 139                                                 ]]end
 140                                         end
 141                                 end
 142                                 if not canExist then
 143                                         player:set_physics_override({
 144                                                 jump = 1,
 145                                                 speed = 1,
 146                                         })
 147                                         if not minetestd then
 148                                                 player:set_physics_override({gravity=1})
 149                                         end
 150                                         hangglider.use[pname] = false
 151                                         if HUD_Overlay then
 152                                         player:hud_change(hangglider.id[pname], "text", "blank.png")
 153                                         end
 154                                         --hangglider.airbreak[pname] = false
 155                                 end
 156                         end
 157                 end
 158                 if not canExist then
 159                         self.object:set_detach()
 160                         self.object:remove()
 161                 end
 162         end
 163 })
 164
 165 minetest.register_on_dieplayer(function(player)
 166         player:set_physics_override({
 167                 gravity = 1,
 168                 jump = 1,
 169         })
 170         hangglider.use[player:get_player_name()] = false
 171 end)
 172
 173
 174 minetest.register_on_joinplayer(function(player)
 175         local pname = player:get_player_name()
 176         player:set_physics_override({
 177                 gravity = 1,
 178                 jump = 1,
 179         })
 180         hangglider.use[pname] = false
 181         if HUD_Overlay then
 182         hangglider.id[pname] = player:hud_add({
 183                 hud_elem_type = "image",
 184                 text = "blank.png",
 185                 position = {x=0, y=0},
 186                 scale = {x=-100, y=-100},
 187                 alignment = {x=1, y=1},
 188                 offset = {x=0, y=0}
 189         }) end
 190         if debug then
 191                 hangglider.debug[pname] = {id = player:hud_add({hud_elem_type = "text",
 192                         position = {x=0.5, y=0.1},
 193                         text = "-",
 194                         number = 0xFF0000}),  -- red text
 195                         -- ht = {50,50,50},
 196                 }
 197         end
 198         --hangglider.airbreak[pname] = false
 199 end)
 200
 201 minetest.register_on_leaveplayer(function(player)
 202         local pname = player:get_player_name()
 203         hangglider.use[pname] = nil
 204         if HUD_Overlay then hangglider.id[pname] = nil end
 205         if debug then hangglider.debug[pname] = nil end
 206         --hangglider.airbreak[pname] = nil
 207 end)
 208
 209 minetest.register_tool("hangglider:hangglider", {
 210         description = "Glider",
 211         inventory_image = "glider_item.png",
 212         stack_max=1,
 213         on_use = function(itemstack, player, pointed_thing)
 214                 if not player then
 215                         return
 216                 end
 217                 local pos = player:get_pos()
 218                 local pname = player:get_player_name()
 219                 if minetest.get_node(pos).name == "air" and not hangglider.use[pname] then --Equip
 220                         minetest.sound_play("bedsheet", {pos=pos, max_hear_distance = 8, gain = 1.0})
 221                         if HUD_Overlay then player:hud_change(hangglider.id[pname], "text", "glider_struts.png") end
 222                         local airbreak = false
 223                         local vel = player:get_player_velocity().y
 224                         if vel < -1.5 then  -- engage mid-air, falling fast, so stop but ramp velocity more quickly
 225                                 --hangglider.airbreak[pname] = true
 226                                 airbreak = true
 227                                 local stopper = minetest.add_entity(pos, "hangglider:airstopper")
 228                                 minetest.after(0, function(stopper, player) --"Extreme Measures"
 229                                         stopper:set_pos(player:get_pos())
 230                                         stopper:get_luaentity().attach = player
 231                                         player:set_attach( stopper, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
 232                                 end, stopper, player)
 233                         end
 234                         if not airbreak then
 235                                 if moveModelUp then
 236                                         minetest.add_entity(pos, "hangglider:glider"):set_attach(player, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
 237                                 else
 238                                         minetest.add_entity(pos, "hangglider:glider"):set_attach(player, "", {x=0,y=0,z=0}, {x=0,y=0,z=0})
 239                                 end
 240                         end
 241                         hangglider.use[pname] = true
 242                         player:set_physics_override({jump = 0})
 243                         -- if minetest 0.4.x use this:
 244
 245                         -- if minetest 5.x use this:
 246                         -- minetest.add_entity(player:get_pos(), "hangglider:glider"):set_attach(player, "", {x=0,y=10,z=0}, {x=0,y=0,z=0})
 247                         itemstack:set_wear(itemstack:get_wear() + 255)
 248                         return itemstack
 249                 elseif hangglider.use[pname] then --Unequip
 250                         if HUD_Overlay then player:hud_change(hangglider.id[pname], "text", "default_wood.png^[colorize:#0000:255") end
 251                         hangglider.use[pname] = false
 252                 end
 253         end,
 254         sound = {breaks = "default_tool_breaks"},
 255 })
 256
 257 minetest.register_craft({
 258         type = "shapeless",
 259         output = "hangglider:hangglider",
 260         recipe = {"default:paper", "default:paper", "default:paper", "default:paper", "hangglider:hangglider", "default:paper", "default:paper", "default:paper", "default:paper"},
 261 })
 262
 263 minetest.register_craft({
 264         output = "hangglider:hangglider",
 265         recipe = {
 266                 {"wool:white", "wool:white", "wool:white"},
 267                 {"default:stick", "", "default:stick"},
 268                 {"", "default:stick", ""},
 269         }
 270 })