mods/minecart/init.lua

   1 local pool = {}
   2
   3 local dirs = {
   4         {x= 1,y= 0,z= 0},
   5         {x=-1,y= 0,z= 0},
   6
   7         {x= 1,y= 1,z= 0},
   8         {x=-1,y= 1,z= 0},
   9
  10         {x= 1,y=-1,z= 0},
  11         {x=-1,y=-1,z= 0},
  12
  13         {x= 0,y= 0,z= 1},
  14         {x= 0,y= 0,z=-1},
  15
  16         {x= 0,y= 1,z= 1},
  17         {x= 0,y= 1,z=-1},
  18
  19         {x= 0,y=-1,z= 1},
  20         {x= 0,y=-1,z=-1},
  21 }
  22
  23 local axis_order = {
  24
  25 }
  26 local function data_injection(pos,data)
  27         if data then
  28                 pool[minetest.hash_node_position(pos)] = true
  29         else
  30                 pool[minetest.hash_node_position(pos)] = nil
  31         end
  32 end
  33
  34
  35 local function create_axis(pos)
  36         local possible_dirs = {}
  37         for _,dir in pairs(dirs) do
  38                 local pos2 = vector.add(pos,dir)
  39                 if pool[minetest.hash_node_position(pos2)] then
  40                         table.insert(possible_dirs,dir)
  41                 end
  42         end
  43         return(possible_dirs)
  44 end
  45
  46 local function collision_detect(self)
  47         if not self.axis_lock then return end
  48         local pos = self.object:get_pos()
  49
  50         for _,object in ipairs(minetest.get_objects_inside_radius(pos, 1)) do
  51                 if object:is_player() then
  52                         local pos2 = object:get_pos()
  53                         if self.axis_lock == "x" then
  54                                 local velocity = 1-vector.distance(vector.new(pos.x,0,0),vector.new(pos2.x,0,0))
  55                                 print(velocity)
  56                                 local dir = vector.direction(vector.new(pos2.x,0,0),vector.new(pos.x,0,0))
  57                                 self.object:add_velocity(vector.multiply(dir,velocity))
  58                                 self.dir = dir
  59                         elseif self.axis_lock == "z" then
  60                                 local velocity = 1-vector.distance(vector.new(0,0,pos.z),vector.new(0,0,pos2.z))
  61                                 local dir = vector.direction(vector.new(0,0,pos2.z),vector.new(0,0,pos.z))
  62                                 self.object:add_velocity(vector.multiply(dir,velocity))
  63                                 self.dir = dir
  64                         end
  65                         return
  66                 end
  67         end
  68 end
  69
  70
  71
  72 local function rail_brain(self,pos)
  73         if not self.dir then return end
  74
  75         --if self.dir then print(dump(self.dir)) end
  76
  77         local pos2 = self.object:get_pos()
  78
  79         local dir = self.dir
  80
  81         local triggered = false
  82
  83         if dir.x < 0 and pos2.x < pos.x then
  84                 triggered = true
  85         elseif dir.x > 0 and pos2.x > pos.x then
  86                 triggered = true
  87         elseif dir.z < 0 and pos2.z < pos.z then
  88                 triggered = true
  89         elseif dir.z > 0 and pos2.z > pos.z then
  90                 triggered = true
  91         end
  92
  93         --print(dump(dir))
  94         if triggered and not pool[minetest.hash_node_position(vector.add(pos,dir))] then
  95                 local possible_dirs = create_axis(pos)
  96                 if table.getn(possible_dirs) == 0 then
  97                         --stop slow down become physical, something
  98                 else
  99                         for _,dir2 in pairs(possible_dirs) do
 100                                 if dir.x ~= 0 and dir2.z ~= 0 then
 101                                         local intertia = math.abs(self.object:get_velocity().x)
 102                                         self.object:set_velocity(vector.multiply(dir2,intertia))
 103                                         self.dir = dir2
 104                                         self.axis_lock = "z"
 105                                         self.object:set_pos(pos)
 106                                         break
 107                                 elseif dir.z ~= 0 and dir2.x ~= 0 then
 108                                         local intertia = math.abs(self.object:get_velocity().z)
 109                                         self.object:set_velocity(vector.multiply(dir2,intertia))
 110                                         self.dir = dir2
 111                                         self.axis_lock = "x"
 112                                         self.object:set_pos(pos)
 113                                         break
 114                                 end
 115                         end
 116                 end
 117         end
 118 end
 119
 120
 121
 122
 123 local minecart = {}
 124
 125 minecart.on_step = function(self,dtime)
 126         local pos = vector.round(self.object:get_pos())
 127         if not self.axis_lock then
 128                 local possible_dirs = create_axis(pos)
 129                 for _,dir in pairs(possible_dirs) do
 130                         if dir.x ~=0 then
 131                                 self.axis_lock = "x"
 132                                 break
 133                         elseif dir.z ~= 0 then
 134                                 self.axis_lock = "z"
 135                                 break
 136                         end
 137                 end
 138         else
 139                 collision_detect(self)
 140                 rail_brain(self,pos)
 141         end
 142 end
 143
 144 minecart.on_rightclick = function(self,clicker)
 145 end
 146
 147 --get old data
 148 minecart.on_activate = function(self,staticdata, dtime_s)
 149         self.object:set_armor_groups({immortal=1})
 150         if string.sub(staticdata, 1, string.len("return")) ~= "return" then
 151                 return
 152         end
 153         local data = minetest.deserialize(staticdata)
 154         if type(data) ~= "table" then
 155                 return
 156         end
 157
 158 end
 159
 160 minecart.get_staticdata = function(self)
 161         return minetest.serialize({
 162         })
 163 end
 164
 165
 166
 167 minecart.initial_properties = {
 168         physical = false, -- otherwise going uphill breaks
 169         collisionbox = {-0.4, -0.5, -0.4, 0.4, 0.45, 0.4},--{-0.5, -0.4, -0.5, 0.5, 0.25, 0.5},
 170         visual = "mesh",
 171         mesh = "minecart.x",
 172         visual_size = {x=1, y=1},
 173         textures = {"minecart.png"},
 174 }
 175
 176
 177 minecart.on_punch = function(self,puncher, time_from_last_punch, tool_capabilities, dir, damage)
 178         --local obj = minetest.add_item(self.object:getpos(), "minecart:minecart")
 179         --self.object:remove()
 180 end
 181
 182
 183
 184 minetest.register_entity("minecart:minecart", minecart)
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197 minetest.register_craftitem("minecart:minecart", {
 198         description = "Minecart",
 199         inventory_image = "minecartitem.png",
 200         wield_image = "minecartitem.png",
 201         on_place = function(itemstack, placer, pointed_thing)
 202                 if not pointed_thing.type == "node" then
 203                         return
 204                 end
 205
 206                 local sneak = placer:get_player_control().sneak
 207                 local noddef = minetest.registered_nodes[minetest.get_node(pointed_thing.under).name]
 208                 if not sneak and noddef.on_rightclick then
 209                         minetest.item_place(itemstack, placer, pointed_thing)
 210                         return
 211                 end
 212
 213                 if minetest.get_item_group(minetest.get_node(pointed_thing.under).name, "rail")>0 then
 214                         minetest.add_entity(pointed_thing.under, "minecart:minecart")
 215                 else
 216                         return
 217                 end
 218
 219                 itemstack:take_item()
 220
 221                 return itemstack
 222         end,
 223 })
 224
 225 minetest.register_craft({
 226         output = "minecart:minecart",
 227         recipe = {
 228                 {"main:iron", "", "main:iron"},
 229                 {"main:iron", "main:iron", "main:iron"},
 230         },
 231 })
 232
 233
 234
 235
 236
 237 minetest.register_node("minecart:rail",{
 238         description = "Rail",
 239         wield_image = "rail.png",
 240         tiles = {
 241                 "rail.png", "railcurve.png",
 242                 "railt.png", "railcross.png"
 243         },
 244         drawtype = "raillike",
 245         paramtype = "light",
 246         sunlight_propagates = true,
 247         is_ground_content = false,
 248         walkable = false,
 249         node_placement_prediction = "",
 250         selection_box = {
 251                 type = "fixed",
 252                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 253         },
 254         sounds = main.stoneSound(),
 255         after_place_node = function(pos)
 256                 data_injection(pos,true)
 257         end,
 258         after_destruct = function(pos)
 259                 data_injection(pos)
 260         end,
 261         groups={stone=1,wood=1,rail=1,attached_node=1},
 262 })
 263
 264
 265 minetest.register_lbm({
 266         name = "minecart:rail",
 267         nodenames = {"minecart:rail"},
 268         run_at_every_load = true,
 269         action = function(pos)
 270                 data_injection(pos,true)
 271                 print("buildin dat cash")
 272         end,
 273 })
 274
 275 minetest.register_craft({
 276         output = "minecart:rail 32",
 277         recipe = {
 278                 {"main:iron","","main:iron"},
 279                 {"main:iron","main:stick","main:iron"},
 280                 {"main:iron","","main:iron"}
 281         }
 282 })