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 = {-0.6,-0.4,-0.6, 0.6,0.3,0.6},
  36         visual = "mesh",
  37         mesh = "boat.x",
  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()
  76         return tostring(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         puncher:set_detach()
  84         default.player_attached[puncher:get_player_name()] = false
  85
  86         self.removed = true
  87         -- delay remove to ensure player is detached
  88         minetest.after(0.1,function()
  89                 self.object:remove()
  90         end)
  91         if not minetest.setting_getbool("creative_mode") then
  92                 puncher:get_inventory():add_item("main", "boats:boat")
  93         end
  94 end
  95
  96 function boat.on_step(self, dtime)
  97         self.v = get_v(self.object:getvelocity())*get_sign(self.v)
  98         if self.driver then
  99                 local ctrl = self.driver:get_player_control()
 100                 local yaw = self.object:getyaw()
 101                 if ctrl.up then
 102                         self.v = self.v+0.1
 103                 end
 104                 if ctrl.down then
 105                         self.v = self.v-0.08
 106                 end
 107                 if ctrl.left then
 108                         if ctrl.down then
 109                                 self.object:setyaw(yaw-math.pi/120-dtime*math.pi/120)
 110                         else
 111                                 self.object:setyaw(yaw+math.pi/120+dtime*math.pi/120)
 112                         end
 113                 end
 114                 if ctrl.right then
 115                         if ctrl.down then
 116                                 self.object:setyaw(yaw+math.pi/120+dtime*math.pi/120)
 117                         else
 118                                 self.object:setyaw(yaw-math.pi/120-dtime*math.pi/120)
 119                         end
 120                 end
 121         end
 122         local velo = self.object:getvelocity()
 123         if self.v == 0 and velo.x == 0 and velo.z == 0 then
 124                 return
 125         end
 126         local s = get_sign(self.v)
 127         self.v = self.v - 0.02*s
 128         if s ~= get_sign(self.v) then
 129                 self.object:setvelocity({x=0, y=0, z=0})
 130                 self.v = 0
 131                 return
 132         end
 133         if math.abs(self.v) > 4.5 then
 134                 self.v = 4.5*get_sign(self.v)
 135         end
 136
 137         local p = self.object:getpos()
 138         p.y = p.y-0.5
 139         local new_velo = {x=0,y=0,z=0}
 140         local new_acce = {x=0,y=0,z=0}
 141         if not is_water(p) then
 142                 if minetest.registered_nodes[minetest.env:get_node(p).name].walkable then
 143                         self.v = 0
 144                 end
 145                 new_acce = {x=0, y=-10, z=0}
 146                 new_velo = get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y)
 147         else
 148                 p.y = p.y+1
 149                 if is_water(p) then
 150                         new_acce = {x=0, y=3, z=0}
 151                         local y = self.object:getvelocity().y
 152                         if y > 2 then
 153                                 y = 2
 154                         end
 155                         if y < 0 then
 156                                 self.object:setacceleration({x=0, y=10, z=0})
 157                         end
 158                         new_velo = get_velocity(self.v, self.object:getyaw(), y)
 159                 else
 160                         new_acce = {x=0, y=0, z=0}
 161                         if math.abs(self.object:getvelocity().y) < 1 then
 162                                 local pos = self.object:getpos()
 163                                 pos.y = math.floor(pos.y)+0.5
 164                                 self.object:setpos(pos)
 165                                 new_velo = get_velocity(self.v, self.object:getyaw(), 0)
 166                         else
 167                                 new_velo = get_velocity(self.v, self.object:getyaw(), self.object:getvelocity().y)
 168                         end
 169                 end
 170         end
 171         self.object:setvelocity(new_velo)
 172         self.object:setacceleration(new_acce)
 173 end
 174
 175 minetest.register_entity("boats:boat", boat)
 176
 177
 178 minetest.register_craftitem("boats:boat", {
 179         description = "Boat",
 180         inventory_image = "boat_inventory.png",
 181         wield_image = "boat_wield.png",
 182         wield_scale = {x=2, y=2, z=1},
 183         liquids_pointable = true,
 184
 185         on_place = function(itemstack, placer, pointed_thing)
 186                 if pointed_thing.type ~= "node" then
 187                         return
 188                 end
 189                 if not is_water(pointed_thing.under) then
 190                         return
 191                 end
 192                 pointed_thing.under.y = pointed_thing.under.y+0.5
 193                 minetest.add_entity(pointed_thing.under, "boats:boat")
 194                 if not minetest.setting_getbool("creative_mode") then
 195                         itemstack:take_item()
 196                 end
 197                 return itemstack
 198         end,
 199 })
 200
 201 minetest.register_craft({
 202         output = "boats:boat",
 203         recipe = {
 204                 {"", "", ""},
 205                 {"group:wood", "", "group:wood"},
 206                 {"group:wood", "group:wood", "group:wood"},
 207         },
 208 })