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)))/10
  55                                 local dir = vector.direction(vector.new(pos2.x,0,0),vector.new(pos.x,0,0))
  56                                 --self.object:add_velocity(vector.multiply(dir,velocity))
  57                                 self.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)))/10
  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.velocity = vector.multiply(dir,velocity)
  64                                 self.dir = dir
  65                         end
  66                         return
  67                 end
  68         end
  69 end
  70
  71 local function direction_snap(self)
  72         local dir = self.dir
  73         local yaw = minetest.dir_to_yaw(dir)
  74         self.object:set_rotation(vector.new(0,yaw,0))
  75 end
  76
  77 local function turn_snap(pos,self,dir,dir2)
  78         if dir.x ~= 0 and dir2.z ~= 0 then
  79                 --local inertia = math.abs(self.object:get_velocity().x)
  80                 local inertia = math.abs(self.velocity.x)
  81                 --self.object:set_velocity(vector.multiply(dir2,inertia))
  82
  83                 self.velocity = vector.multiply(dir2,inertia)
  84                 self.dir = dir2
  85                 self.axis_lock = "z"
  86                 self.object:set_pos(pos)
  87                 direction_snap(self)
  88                 return(true)
  89         elseif dir.z ~= 0 and dir2.x ~= 0 then
  90                 --local inertia = math.abs(self.object:get_velocity().z)
  91                 --print(dump(self.velocity))
  92                 local inertia = math.abs(self.velocity.z)
  93                 --self.object:set_velocity(vector.multiply(dir2,inertia))
  94
  95                 self.velocity = vector.multiply(dir2,inertia)
  96
  97                 self.dir = dir2
  98                 self.axis_lock = "x"
  99                 self.object:set_pos(pos)
 100                 direction_snap(self)
 101                 return(true)
 102         end
 103 end
 104
 105 local function rail_brain(self,pos)
 106         if not self.dir then return end
 107
 108         --if self.dir then print(dump(self.dir)) end
 109
 110         local pos2 = self.object:get_pos()
 111
 112         local dir = self.dir
 113
 114         local triggered = false
 115
 116         if dir.x < 0 and pos2.x < pos.x then
 117                 triggered = true
 118         elseif dir.x > 0 and pos2.x > pos.x then
 119                 triggered = true
 120         elseif dir.z < 0 and pos2.z < pos.z then
 121                 triggered = true
 122         elseif dir.z > 0 and pos2.z > pos.z then
 123                 triggered = true
 124         end
 125
 126         --print(dump(dir))
 127         if triggered and not pool[minetest.hash_node_position(vector.add(pos,dir))] then
 128                 local possible_dirs = create_axis(pos)
 129                 if table.getn(possible_dirs) == 0 then
 130                         --print("train fails")
 131                         --stop slow down become physical, something
 132                 else
 133                         for _,dir2 in pairs(possible_dirs) do
 134                                 if turn_snap(pos,self,dir,dir2) then
 135                                         return
 136                                 end
 137                         end
 138                 end
 139         end
 140 end
 141
 142
 143
 144
 145 local minecart = {}
 146
 147 minecart.on_step = function(self,dtime)
 148         local float_pos = self.object:get_pos()
 149         local pos = vector.round(float_pos)
 150
 151         if self.velocity then
 152                 local new_vel = dtime/0.01
 153                 print(new_vel)
 154                 self.object:move_to(vector.add(float_pos,vector.multiply(self.velocity,new_vel)))
 155         end
 156
 157         --stop minecarts from derailing when going super fast
 158         if self.old_pos and vector.distance(float_pos,self.old_pos) > 0.5 then
 159                 self.object:move_to(self.old_pos)
 160                 float_pos = self.object:get_pos()
 161                 pos = vector.round(self.old_pos)
 162         end
 163
 164         if not self.axis_lock then
 165                 local possible_dirs = create_axis(pos)
 166                 for _,dir in pairs(possible_dirs) do
 167                         if dir.x ~=0 then
 168                                 self.axis_lock = "x"
 169                                 break
 170                         elseif dir.z ~= 0 then
 171                                 self.axis_lock = "z"
 172                                 break
 173                         end
 174                 end
 175         else
 176                 collision_detect(self)
 177                 rail_brain(self,pos)
 178         end
 179         self.old_pos = float_pos
 180 end
 181
 182 minecart.on_rightclick = function(self,clicker)
 183 end
 184
 185 --get old data
 186 minecart.on_activate = function(self,staticdata, dtime_s)
 187         self.object:set_armor_groups({immortal=1})
 188         if string.sub(staticdata, 1, string.len("return")) ~= "return" then
 189                 return
 190         end
 191         local data = minetest.deserialize(staticdata)
 192         if type(data) ~= "table" then
 193                 return
 194         end
 195         self.old_pos = self.object:get_pos()
 196         self.velocity = vector.new(0,0,0)
 197 end
 198
 199 minecart.get_staticdata = function(self)
 200         return minetest.serialize({
 201         })
 202 end
 203
 204
 205
 206 minecart.initial_properties = {
 207         physical = false, -- otherwise going uphill breaks
 208         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},
 209         visual = "mesh",
 210         mesh = "minecart.x",
 211         visual_size = {x=1, y=1},
 212         textures = {"minecart.png"},
 213 }
 214
 215
 216 minecart.on_punch = function(self,puncher, time_from_last_punch, tool_capabilities, dir, damage)
 217         --local obj = minetest.add_item(self.object:getpos(), "minecart:minecart")
 218         --self.object:remove()
 219 end
 220
 221
 222
 223 minetest.register_entity("minecart:minecart", minecart)
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236 minetest.register_craftitem("minecart:minecart", {
 237         description = "Minecart",
 238         inventory_image = "minecartitem.png",
 239         wield_image = "minecartitem.png",
 240         on_place = function(itemstack, placer, pointed_thing)
 241                 if not pointed_thing.type == "node" then
 242                         return
 243                 end
 244
 245                 local sneak = placer:get_player_control().sneak
 246                 local noddef = minetest.registered_nodes[minetest.get_node(pointed_thing.under).name]
 247                 if not sneak and noddef.on_rightclick then
 248                         minetest.item_place(itemstack, placer, pointed_thing)
 249                         return
 250                 end
 251
 252                 if minetest.get_item_group(minetest.get_node(pointed_thing.under).name, "rail")>0 then
 253                         minetest.add_entity(pointed_thing.under, "minecart:minecart")
 254                 else
 255                         return
 256                 end
 257
 258                 itemstack:take_item()
 259
 260                 return itemstack
 261         end,
 262 })
 263
 264 minetest.register_craft({
 265         output = "minecart:minecart",
 266         recipe = {
 267                 {"main:iron", "", "main:iron"},
 268                 {"main:iron", "main:iron", "main:iron"},
 269         },
 270 })
 271
 272
 273
 274
 275
 276 minetest.register_node("minecart:rail",{
 277         description = "Rail",
 278         wield_image = "rail.png",
 279         tiles = {
 280                 "rail.png", "railcurve.png",
 281                 "railt.png", "railcross.png"
 282         },
 283         drawtype = "raillike",
 284         paramtype = "light",
 285         sunlight_propagates = true,
 286         is_ground_content = false,
 287         walkable = false,
 288         node_placement_prediction = "",
 289         selection_box = {
 290                 type = "fixed",
 291                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 292         },
 293         sounds = main.stoneSound(),
 294         after_place_node = function(pos)
 295                 data_injection(pos,true)
 296         end,
 297         after_destruct = function(pos)
 298                 data_injection(pos)
 299         end,
 300         groups={stone=1,wood=1,rail=1,attached_node=1},
 301 })
 302
 303
 304 minetest.register_lbm({
 305         name = "minecart:rail",
 306         nodenames = {"minecart:rail"},
 307         run_at_every_load = true,
 308         action = function(pos)
 309                 data_injection(pos,true)
 310                 print("buildin dat cash")
 311         end,
 312 })
 313
 314 minetest.register_craft({
 315         output = "minecart:rail 32",
 316         recipe = {
 317                 {"main:iron","","main:iron"},
 318                 {"main:iron","main:stick","main:iron"},
 319                 {"main:iron","","main:iron"}
 320         }
 321 })