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                                         break
 106                                 elseif dir.z ~= 0 and dir2.x ~= 0 then
 107                                         local intertia = math.abs(self.object:get_velocity().z)
 108                                         self.object:set_velocity(vector.multiply(dir2,intertia))
 109                                         self.dir = dir2
 110                                         self.axis_lock = "x"
 111                                         break
 112                                 end
 113                         end
 114                 end
 115         end
 116 end
 117
 118
 119
 120
 121 local minecart = {}
 122
 123 minecart.on_step = function(self,dtime)
 124         local pos = vector.round(self.object:get_pos())
 125         if not self.axis_lock then
 126                 local possible_dirs = create_axis(pos)
 127                 for _,dir in pairs(possible_dirs) do
 128                         if dir.x ~=0 then
 129                                 self.axis_lock = "x"
 130                                 break
 131                         elseif dir.z ~= 0 then
 132                                 self.axis_lock = "z"
 133                                 break
 134                         end
 135                 end
 136         else
 137                 collision_detect(self)
 138                 rail_brain(self,pos)
 139         end
 140 end
 141
 142 minecart.on_rightclick = function(self,clicker)
 143 end
 144
 145 --get old data
 146 minecart.on_activate = function(self,staticdata, dtime_s)
 147         self.object:set_armor_groups({immortal=1})
 148         if string.sub(staticdata, 1, string.len("return")) ~= "return" then
 149                 return
 150         end
 151         local data = minetest.deserialize(staticdata)
 152         if type(data) ~= "table" then
 153                 return
 154         end
 155
 156 end
 157
 158 minecart.get_staticdata = function(self)
 159         return minetest.serialize({
 160         })
 161 end
 162
 163
 164
 165 minecart.initial_properties = {
 166         physical = false, -- otherwise going uphill breaks
 167         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},
 168         visual = "mesh",
 169         mesh = "minecart.x",
 170         visual_size = {x=1, y=1},
 171         textures = {"minecart.png"},
 172 }
 173
 174
 175 minecart.on_punch = function(self,puncher, time_from_last_punch, tool_capabilities, dir, damage)
 176         --local obj = minetest.add_item(self.object:getpos(), "minecart:minecart")
 177         --self.object:remove()
 178 end
 179
 180
 181
 182 minetest.register_entity("minecart:minecart", minecart)
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195 minetest.register_craftitem("minecart:minecart", {
 196         description = "Minecart",
 197         inventory_image = "minecartitem.png",
 198         wield_image = "minecartitem.png",
 199         on_place = function(itemstack, placer, pointed_thing)
 200                 if not pointed_thing.type == "node" then
 201                         return
 202                 end
 203
 204                 local sneak = placer:get_player_control().sneak
 205                 local noddef = minetest.registered_nodes[minetest.get_node(pointed_thing.under).name]
 206                 if not sneak and noddef.on_rightclick then
 207                         minetest.item_place(itemstack, placer, pointed_thing)
 208                         return
 209                 end
 210
 211                 if minetest.get_item_group(minetest.get_node(pointed_thing.under).name, "rail")>0 then
 212                         minetest.add_entity(pointed_thing.under, "minecart:minecart")
 213                 else
 214                         return
 215                 end
 216
 217                 itemstack:take_item()
 218
 219                 return itemstack
 220         end,
 221 })
 222
 223 minetest.register_craft({
 224         output = "minecart:minecart",
 225         recipe = {
 226                 {"main:iron", "", "main:iron"},
 227                 {"main:iron", "main:iron", "main:iron"},
 228         },
 229 })
 230
 231
 232
 233
 234
 235 minetest.register_node("minecart:rail",{
 236         description = "Rail",
 237         wield_image = "rail.png",
 238         tiles = {
 239                 "rail.png", "railcurve.png",
 240                 "railt.png", "railcross.png"
 241         },
 242         drawtype = "raillike",
 243         paramtype = "light",
 244         sunlight_propagates = true,
 245         is_ground_content = false,
 246         walkable = false,
 247         node_placement_prediction = "",
 248         selection_box = {
 249                 type = "fixed",
 250                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 251         },
 252         sounds = main.stoneSound(),
 253         after_place_node = function(pos)
 254                 data_injection(pos,true)
 255         end,
 256         after_destruct = function(pos)
 257                 data_injection(pos)
 258         end,
 259         groups={stone=1,wood=1,rail=1,attached_node=1},
 260 })
 261
 262
 263 minetest.register_lbm({
 264         name = "minecart:rail",
 265         nodenames = {"minecart:rail"},
 266         run_at_every_load = true,
 267         action = function(pos)
 268                 data_injection(pos,true)
 269                 print("buildin dat cash")
 270         end,
 271 })
 272
 273 minetest.register_craft({
 274         output = "minecart:rail 32",
 275         recipe = {
 276                 {"main:iron","","main:iron"},
 277                 {"main:iron","main:stick","main:iron"},
 278                 {"main:iron","","main:iron"}
 279         }
 280 })