mods/boats/init.lua

   1
   2 --
   3 -- Helper functions
   4 --
   5
   6 local function is_water(pos)
   7         local nn = minetest.get_node(pos).name
   8         return minetest.get_item_group(nn, "water") ~= 0
   9 end
  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 local function get_velocity(v, yaw, y)
  20         local x = -math.sin(yaw) * v
  21         local z =  math.cos(yaw) * v
  22         return {x = x, y = y, z = z}
  23 end
  24
  25 local function get_v(v)
  26         return math.sqrt(v.x ^ 2 + v.z ^ 2)
  27 end
  28
  29 --
  30 -- Boat entity
  31 --
  32
  33 local boat = {
  34         physical = true,
  35         collisionbox = {-0.5, -0.4, -0.5, 0.5, 0.3, 0.5},
  36         visual = "mesh",
  37         mesh = "boat.obj",
  38         textures = {"default_wood.png"},
  39
  40         driver = nil,
  41         v = 0,
  42         last_v = 0,
  43         removed = false
  44 }
  45
  46 function boat.on_rightclick(self, clicker)
  47         if not clicker or not clicker:is_player() then
  48                 return
  49         end
  50         local name = clicker:get_player_name()
  51         if self.driver and clicker == self.driver then
  52                 self.driver = nil
  53                 clicker:set_detach()
  54                 default.player_attached[name] = false
  55                 default.player_set_animation(clicker, "stand" , 30)
  56         elseif not self.driver then
  57                 self.driver = clicker
  58                 clicker:set_attach(self.object, "", {x = 0, y = 11, z = -3}, {x = 0, y = 0, z = 0})
  59                 default.player_attached[name] = true
  60                 minetest.after(0.2, function()
  61                         default.player_set_animation(clicker, "sit" , 30)
  62                 end)
  63                 self.object:setyaw(clicker:get_look_yaw() - math.pi / 2)
  64         end
  65 end
  66
  67 function boat.on_activate(self, staticdata, dtime_s)
  68         self.object:set_armor_groups({immortal = 1})
  69         if staticdata then
  70                 self.v = tonumber(staticdata)
  71         end
  72         self.last_v = self.v
  73 end
  74
  75 function boat.get_staticdata(self)
  76         return tostring(self.v)
  77 end
  78
  79 function boat.on_punch(self, puncher, time_from_last_punch, tool_capabilities, direction)
  80         if not puncher or not puncher:is_player() or self.removed then
  81                 return
  82         end
  83         if self.driver and puncher == self.driver then
  84                 self.driver = nil
  85                 puncher:set_detach()
  86                 default.player_attached[puncher:get_player_name()] = false
  87         end
  88         if not self.driver then
  89                 self.removed = true
  90                 -- delay remove to ensure player is detached
  91                 minetest.after(0.1, function()
  92                         self.object:remove()
  93                 end)
  94                 if not minetest.setting_getbool("creative_mode") then
  95                         puncher:get_inventory():add_item("main", "boats:boat")
  96                 end
  97         end
  98 end
  99
 100 function boat.on_step(self, dtime)
 101         self.v = get_v(self.object:getvelocity()) * get_sign(self.v)
 102         if self.driver then
 103                 local ctrl = self.driver:get_player_control()
 104                 local yaw = self.object:getyaw()
 105                 if ctrl.up then
 106                         self.v = self.v + 0.1
 107                 elseif ctrl.down then
 108                         self.v = self.v - 0.1
 109                 end
 110                 if ctrl.left then
 111                         if self.v < 0 then
 112                                 self.object:setyaw(yaw - (1 + dtime) * 0.03)
 113                         else
 114                                 self.object:setyaw(yaw + (1 + dtime) * 0.03)
 115                         end
 116                 elseif ctrl.right then
 117                         if self.v < 0 then
 118                                 self.object:setyaw(yaw + (1 + dtime) * 0.03)
 119                         else
 120                                 self.object:setyaw(yaw - (1 + dtime) * 0.03)
 121                         end
 122                 end
 123         end
 124         local velo = self.object:getvelocity()
 125         if self.v == 0 and velo.x == 0 and velo.y == 0 and velo.z == 0 then
 126                 self.object:setpos(self.object:getpos())
 127                 return
 128         end
 129         local s = get_sign(self.v)
 130         self.v = self.v - 0.02 * s
 131         if s ~= get_sign(self.v) then
 132                 self.object:setvelocity({x = 0, y = 0, z = 0})
 133                 self.v = 0
 134                 return
 135         end
 136         if math.abs(self.v) > 4.5 then
 137                 self.v = 4.5 * get_sign(self.v)
 138         end
 139
 140         local p = self.object:getpos()
 141         p.y = p.y - 0.5
 142         local new_velo = {x = 0, y = 0, z = 0}
 143         local new_acce = {x = 0, y = 0, z = 0}
 144         if not is_water(p) then
 145                 local nodedef = minetest.registered_nodes[minetest.get_node(p).name]
 146                 if (not nodedef) or nodedef.walkable then
 147                         self.v = 0
 148                         new_acce = {x = 0, y = 1, z = 0}
 149                 else
 150                         new_acce = {x = 0, y = -9.8, z = 0}
 151                 end
 152                 new_velo = get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y)
 153                 self.object:setpos(self.object:getpos())
 154         else
 155                 p.y = p.y + 1
 156                 if is_water(p) then
 157                         local y = self.object:getvelocity().y
 158                         if y >= 4.5 then
 159                                 y = 4.5
 160                         elseif y < 0 then
 161                                 new_acce = {x = 0, y = 20, z = 0}
 162                         else
 163                                 new_acce = {x = 0, y = 5, z = 0}
 164                         end
 165                         new_velo = get_velocity(self.v, self.object:getyaw(), y)
 166                         self.object:setpos(self.object:getpos())
 167                 else
 168                         new_acce = {x = 0, y = 0, z = 0}
 169                         if math.abs(self.object:getvelocity().y) < 1 then
 170                                 local pos = self.object:getpos()
 171                                 pos.y = math.floor(pos.y) + 0.5
 172                                 self.object:setpos(pos)
 173                                 new_velo = get_velocity(self.v, self.object:getyaw(), 0)
 174                         else
 175                                 new_velo = get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y)
 176                                 self.object:setpos(self.object:getpos())
 177                         end
 178                 end
 179         end
 180         self.object:setvelocity(new_velo)
 181         self.object:setacceleration(new_acce)
 182 end
 183
 184 minetest.register_entity("boats:boat", boat)
 185
 186 minetest.register_craftitem("boats:boat", {
 187         description = "Boat",
 188         inventory_image = "boat_inventory.png",
 189         wield_image = "boat_wield.png",
 190         wield_scale = {x = 2, y = 2, z = 1},
 191         liquids_pointable = true,
 192
 193         on_place = function(itemstack, placer, pointed_thing)
 194                 if pointed_thing.type ~= "node" then
 195                         return
 196                 end
 197                 if not is_water(pointed_thing.under) then
 198                         return
 199                 end
 200                 pointed_thing.under.y = pointed_thing.under.y + 0.5
 201                 minetest.add_entity(pointed_thing.under, "boats:boat")
 202                 if not minetest.setting_getbool("creative_mode") then
 203                         itemstack:take_item()
 204                 end
 205                 return itemstack
 206         end,
 207 })
 208
 209 minetest.register_craft({
 210         output = "boats:boat",
 211         recipe = {
 212                 {"",           "",           ""          },
 213                 {"group:wood", "",           "group:wood"},
 214                 {"group:wood", "group:wood", "group:wood"},
 215         },
 216 })
 217