mods/boats/init.lua

   1 --
   2 -- Helper functions
   3 --
   4
   5 local function is_water(pos)
   6         local nn = minetest.get_node(pos).name
   7         return minetest.get_item_group(nn, "water") ~= 0
   8 end
   9
  10
  11 local function get_sign(i)
  12         if i == 0 then
  13                 return 0
  14         else
  15                 return i / math.abs(i)
  16         end
  17 end
  18
  19
  20 local function get_velocity(v, yaw, y)
  21         local x = -math.sin(yaw) * v
  22         local z =  math.cos(yaw) * v
  23         return {x = x, y = y, z = z}
  24 end
  25
  26
  27 local function get_v(v)
  28         return math.sqrt(v.x ^ 2 + v.z ^ 2)
  29 end
  30
  31 --
  32 -- Boat entity
  33 --
  34
  35 local boat = {
  36         physical = true,
  37         -- Warning: Do not change the position of the collisionbox top surface,
  38         -- lowering it causes the boat to fall through the world if underwater
  39         collisionbox = {-0.5, -0.35, -0.5, 0.5, 0.3, 0.5},
  40         visual = "mesh",
  41         mesh = "boats_boat.obj",
  42         textures = {"default_wood.png"},
  43
  44         driver = nil,
  45         v = 0,
  46         last_v = 0,
  47         removed = false
  48 }
  49
  50
  51 function boat.on_rightclick(self, clicker)
  52         if not clicker or not clicker:is_player() then
  53                 return
  54         end
  55         local name = clicker:get_player_name()
  56         if self.driver and clicker == self.driver then
  57                 self.driver = nil
  58                 clicker:set_detach()
  59                 default.player_attached[name] = false
  60                 default.player_set_animation(clicker, "stand" , 30)
  61                 local pos = clicker:getpos()
  62                 pos = {x = pos.x, y = pos.y + 0.2, z = pos.z}
  63                 minetest.after(0.1, function()
  64                         clicker:setpos(pos)
  65                 end)
  66         elseif not self.driver then
  67                 local attach = clicker:get_attach()
  68                 if attach and attach:get_luaentity() then
  69                         local luaentity = attach:get_luaentity()
  70                         if luaentity.driver then
  71                                 luaentity.driver = nil
  72                         end
  73                         clicker:set_detach()
  74                 end
  75                 self.driver = clicker
  76                 clicker:set_attach(self.object, "",
  77                         {x = 0, y = 11, z = -3}, {x = 0, y = 0, z = 0})
  78                 default.player_attached[name] = true
  79                 minetest.after(0.2, function()
  80                         default.player_set_animation(clicker, "sit" , 30)
  81                 end)
  82                 clicker:set_look_horizontal(self.object:getyaw())
  83         end
  84 end
  85
  86
  87 function boat.on_activate(self, staticdata, dtime_s)
  88         self.object:set_armor_groups({immortal = 1})
  89         if staticdata then
  90                 self.v = tonumber(staticdata)
  91         end
  92         self.last_v = self.v
  93 end
  94
  95
  96 function boat.get_staticdata(self)
  97         return tostring(self.v)
  98 end
  99
 100
 101 function boat.on_punch(self, puncher)
 102         if not puncher or not puncher:is_player() or self.removed then
 103                 return
 104         end
 105         if self.driver and puncher == self.driver then
 106                 self.driver = nil
 107                 puncher:set_detach()
 108                 default.player_attached[puncher:get_player_name()] = false
 109         end
 110         if not self.driver then
 111                 self.removed = true
 112                 -- delay remove to ensure player is detached
 113                 minetest.after(0.1, function()
 114                         self.object:remove()
 115                 end)
 116                 if not minetest.setting_getbool("creative_mode") then
 117                         local inv = puncher:get_inventory()
 118                         if inv:room_for_item("main", "boats:boat") then
 119                                 inv:add_item("main", "boats:boat")
 120                         else
 121                                 minetest.add_item(self.object:getpos(), "boats:boat")
 122                         end
 123                 end
 124         end
 125 end
 126
 127
 128 function boat.on_step(self, dtime)
 129         self.v = get_v(self.object:getvelocity()) * get_sign(self.v)
 130         if self.driver then
 131                 local ctrl = self.driver:get_player_control()
 132                 local yaw = self.object:getyaw()
 133                 if ctrl.up then
 134                         self.v = self.v + 0.1
 135                 elseif ctrl.down then
 136                         self.v = self.v - 0.1
 137                 end
 138                 if ctrl.left then
 139                         if self.v < 0 then
 140                                 self.object:setyaw(yaw - (1 + dtime) * 0.03)
 141                         else
 142                                 self.object:setyaw(yaw + (1 + dtime) * 0.03)
 143                         end
 144                 elseif ctrl.right then
 145                         if self.v < 0 then
 146                                 self.object:setyaw(yaw + (1 + dtime) * 0.03)
 147                         else
 148                                 self.object:setyaw(yaw - (1 + dtime) * 0.03)
 149                         end
 150                 end
 151         end
 152         local velo = self.object:getvelocity()
 153         if self.v == 0 and velo.x == 0 and velo.y == 0 and velo.z == 0 then
 154                 self.object:setpos(self.object:getpos())
 155                 return
 156         end
 157         local s = get_sign(self.v)
 158         self.v = self.v - 0.02 * s
 159         if s ~= get_sign(self.v) then
 160                 self.object:setvelocity({x = 0, y = 0, z = 0})
 161                 self.v = 0
 162                 return
 163         end
 164         if math.abs(self.v) > 5 then
 165                 self.v = 5 * get_sign(self.v)
 166         end
 167
 168         local p = self.object:getpos()
 169         p.y = p.y - 0.5
 170         local new_velo
 171         local new_acce = {x = 0, y = 0, z = 0}
 172         if not is_water(p) then
 173                 local nodedef = minetest.registered_nodes[minetest.get_node(p).name]
 174                 if (not nodedef) or nodedef.walkable then
 175                         self.v = 0
 176                         new_acce = {x = 0, y = 1, z = 0}
 177                 else
 178                         new_acce = {x = 0, y = -9.8, z = 0}
 179                 end
 180                 new_velo = get_velocity(self.v, self.object:getyaw(),
 181                         self.object:getvelocity().y)
 182                 self.object:setpos(self.object:getpos())
 183         else
 184                 p.y = p.y + 1
 185                 if is_water(p) then
 186                         local y = self.object:getvelocity().y
 187                         if y >= 5 then
 188                                 y = 5
 189                         elseif y < 0 then
 190                                 new_acce = {x = 0, y = 20, z = 0}
 191                         else
 192                                 new_acce = {x = 0, y = 5, z = 0}
 193                         end
 194                         new_velo = get_velocity(self.v, self.object:getyaw(), y)
 195                         self.object:setpos(self.object:getpos())
 196                 else
 197                         new_acce = {x = 0, y = 0, z = 0}
 198                         if math.abs(self.object:getvelocity().y) < 1 then
 199                                 local pos = self.object:getpos()
 200                                 pos.y = math.floor(pos.y) + 0.5
 201                                 self.object:setpos(pos)
 202                                 new_velo = get_velocity(self.v, self.object:getyaw(), 0)
 203                         else
 204                                 new_velo = get_velocity(self.v, self.object:getyaw(),
 205                                         self.object:getvelocity().y)
 206                                 self.object:setpos(self.object:getpos())
 207                         end
 208                 end
 209         end
 210         self.object:setvelocity(new_velo)
 211         self.object:setacceleration(new_acce)
 212 end
 213
 214
 215 minetest.register_entity("boats:boat", boat)
 216
 217
 218 minetest.register_craftitem("boats:boat", {
 219         description = "Boat",
 220         inventory_image = "boats_inventory.png",
 221         wield_image = "boats_wield.png",
 222         wield_scale = {x = 2, y = 2, z = 1},
 223         liquids_pointable = true,
 224         groups = {flammable = 2},
 225
 226         on_place = function(itemstack, placer, pointed_thing)
 227                 if pointed_thing.type ~= "node" then
 228                         return itemstack
 229                 end
 230                 if not is_water(pointed_thing.under) then
 231                         return itemstack
 232                 end
 233                 pointed_thing.under.y = pointed_thing.under.y + 0.5
 234                 boat = minetest.add_entity(pointed_thing.under, "boats:boat")
 235                 boat:setyaw(placer:get_look_horizontal())
 236                 if not minetest.setting_getbool("creative_mode") then
 237                         itemstack:take_item()
 238                 end
 239                 return itemstack
 240         end,
 241 })
 242
 243
 244 minetest.register_craft({
 245         output = "boats:boat",
 246         recipe = {
 247                 {"",           "",           ""          },
 248                 {"group:wood", "",           "group:wood"},
 249                 {"group:wood", "group:wood", "group:wood"},
 250         },
 251 })
 252
 253 minetest.register_craft({
 254         type = "fuel",
 255         recipe = "boats:boat",
 256         burntime = 20,
 257 })