mods/boat/init.lua

   1 --
   2 -- Helper functions
   3 --
   4 local init = os.clock()
   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_velocity(v, yaw, y)
  12         local x = -math.sin(yaw)*v
  13         local z = math.cos(yaw)*v
  14         return {x=x, y=y, z=z}
  15 end
  16
  17 --
  18 -- boat entity
  19 --
  20 local boat = {
  21         physical = true,
  22         collisionbox = {-1,-0.5,-1, 1,0.5,1},
  23         visual = "mesh",
  24         mesh = "boat_base.x",
  25         textures = {"boat_texture.png"},
  26         driver = nil,
  27         v = 0,
  28         stepcount = 0,
  29         unattended = 0
  30 }
  31
  32 function boat.on_rightclick(self, clicker)
  33         if not clicker or not clicker:is_player() then
  34                 return
  35         end
  36         if self.driver and clicker == self.driver then
  37                 self.driver = nil
  38                 clicker:set_detach()
  39         elseif not self.driver then
  40                 self.driver = clicker
  41                 clicker:set_attach(self.object, "", {x=0,y=5,z=0}, {x=0,y=0,z=0})
  42                 self.object:setyaw(clicker:get_look_yaw())
  43         end
  44 end
  45
  46 function boat.on_activate(self, staticdata, dtime_s)
  47         self.object:set_armor_groups({immortal=1})
  48         if staticdata then
  49                 self.v = tonumber(staticdata)
  50         end
  51 end
  52
  53 function boat.get_staticdata()
  54         return tostring(v)
  55 end
  56
  57 function boat.on_punch(self, puncher, time_from_last_punch, tool_capabilities, direction)
  58
  59          if self.driver then
  60                 self.driver:set_detach()
  61                 self.driver = nil
  62                 boat.schedule_removal(self)
  63                 if not minetest.setting_getbool("creative_mode") then
  64                         puncher:get_inventory():add_item("main", "boat:boat")
  65                 end
  66         else
  67
  68                 boat.schedule_removal(self)
  69                 if not minetest.setting_getbool("creative_mode") then
  70                         puncher:get_inventory():add_item("main", "boat:boat")
  71                 end
  72
  73         end
  74 end
  75
  76 function boat.on_step(self, dtime)
  77
  78         self.stepcount=self.stepcount+1
  79         if self.stepcount>9 then
  80
  81                 self.stepcount=0
  82
  83                 if self.driver then
  84                         local ctrl = self.driver:get_player_control()
  85
  86                         self.unattended=0
  87
  88                         local yaw = self.object:getyaw()
  89
  90                         if ctrl.up and self.v<3 then
  91                                 self.v = self.v + 1
  92                         end
  93
  94                         if ctrl.down and self.v>=-1 then
  95                                 self.v = self.v - 1
  96                         end
  97
  98                         if ctrl.left then
  99                                 if ctrl.down then
 100                                         self.object:setyaw(yaw-math.pi/12-dtime*math.pi/12)
 101                                 else
 102                                         self.object:setyaw(yaw+math.pi/12+dtime*math.pi/12)
 103                                 end
 104                         end
 105                         if ctrl.right then
 106                                 if ctrl.down then
 107                                         self.object:setyaw(yaw+math.pi/12+dtime*math.pi/12)
 108                                 else
 109                                         self.object:setyaw(yaw-math.pi/12-dtime*math.pi/12)
 110                                 end
 111                         end
 112                 end
 113
 114                 local tmp_velocity = get_velocity(self.v, self.object:getyaw(), 0)
 115
 116                 local tmp_pos = self.object:getpos()
 117
 118                 tmp_velocity.y=0
 119
 120                 if is_water(tmp_pos) then
 121                         tmp_velocity.y=2
 122                 end
 123
 124                 tmp_pos.y=tmp_pos.y-0.5
 125
 126                 if minetest.get_node(tmp_pos).name=="air" then
 127                         tmp_velocity.y=-2
 128                 end
 129
 130                 self.object:setvelocity(tmp_velocity)
 131
 132         end
 133
 134 end
 135
 136 function boat.schedule_removal(self)
 137
 138         minetest.after(0.25,function()
 139                 self.object:remove()
 140         end)
 141
 142 end
 143
 144
 145 minetest.register_entity("boat:boat", boat)
 146
 147 minetest.register_craftitem("boat:boat", {
 148         description = "Boat",
 149         inventory_image = "boat_inventory.png",
 150         liquids_pointable = true,
 151
 152         on_place = function(itemstack, placer, pointed_thing)
 153                 if pointed_thing.type ~= "node" then
 154                         return
 155                 end
 156                 if not is_water(pointed_thing.under) then
 157                         return
 158                 end
 159                 pointed_thing.under.y = pointed_thing.under.y+0.5
 160                 minetest.add_entity(pointed_thing.under, "boat:boat")
 161                 if not minetest.setting_getbool("creative_mode") then
 162                         itemstack:take_item()
 163                 end
 164                 return itemstack
 165         end,
 166 })
 167
 168 minetest.register_craft({
 169         output = "boat:boat",
 170         recipe = {
 171                 {"", "", ""},
 172                 {"", "", ""},
 173                 {"default:wood", "", ""},
 174         },
 175 })
 176
 177 local time_to_load= os.clock() - init
 178 print(string.format("[MOD] "..minetest.get_current_modname().." loaded in %.4f s", time_to_load))