builtin/game/falling.lua

   1 -- Minetest: builtin/item.lua
   2
   3 --
   4 -- Falling stuff
   5 --
   6
   7 core.register_entity(":__builtin:falling_node", {
   8         initial_properties = {
   9                 physical = true,
  10                 collide_with_objects = false,
  11                 collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
  12                 visual = "wielditem",
  13                 textures = {},
  14                 visual_size = {x=0.667, y=0.667},
  15         },
  16
  17         node = {},
  18
  19         set_node = function(self, node)
  20                 self.node = node
  21                 local stack = ItemStack(node.name)
  22                 local itemtable = stack:to_table()
  23                 local itemname = nil
  24                 if itemtable then
  25                         itemname = stack:to_table().name
  26                 end
  27                 local item_texture = nil
  28                 local item_type = ""
  29                 if core.registered_items[itemname] then
  30                         item_texture = core.registered_items[itemname].inventory_image
  31                         item_type = core.registered_items[itemname].type
  32                 end
  33                 prop = {
  34                         is_visible = true,
  35                         textures = {node.name},
  36                 }
  37                 self.object:set_properties(prop)
  38         end,
  39
  40         get_staticdata = function(self)
  41                 return self.node.name
  42         end,
  43
  44         on_activate = function(self, staticdata)
  45                 self.object:set_armor_groups({immortal=1})
  46                 self:set_node({name=staticdata})
  47         end,
  48
  49         on_step = function(self, dtime)
  50                 -- Set gravity
  51                 self.object:setacceleration({x=0, y=-10, z=0})
  52                 -- Turn to actual sand when collides to ground or just move
  53                 local pos = self.object:getpos()
  54                 local bcp = {x=pos.x, y=pos.y-0.7, z=pos.z} -- Position of bottom center point
  55                 local bcn = core.get_node(bcp)
  56                 local bcd = core.registered_nodes[bcn.name]
  57                 -- Note: walkable is in the node definition, not in item groups
  58                 if not bcd or
  59                                 (bcd.walkable or
  60                                 (core.get_item_group(self.node.name, "float") ~= 0 and
  61                                 bcd.liquidtype ~= "none")) then
  62                         if bcd and bcd.leveled and
  63                                         bcn.name == self.node.name then
  64                                 local addlevel = self.node.level
  65                                 if addlevel == nil or addlevel <= 0 then
  66                                         addlevel = bcd.leveled
  67                                 end
  68                                 if core.add_node_level(bcp, addlevel) == 0 then
  69                                         self.object:remove()
  70                                         return
  71                                 end
  72                         elseif bcd and bcd.buildable_to and
  73                                         (core.get_item_group(self.node.name, "float") == 0 or
  74                                         bcd.liquidtype == "none") then
  75                                 core.remove_node(bcp)
  76                                 return
  77                         end
  78                         local np = {x=bcp.x, y=bcp.y+1, z=bcp.z}
  79                         -- Check what's here
  80                         local n2 = core.get_node(np)
  81                         -- If it's not air or liquid, remove node and replace it with
  82                         -- it's drops
  83                         if n2.name ~= "air" and (not core.registered_nodes[n2.name] or
  84                                         core.registered_nodes[n2.name].liquidtype == "none") then
  85                                 core.remove_node(np)
  86                                 if core.registered_nodes[n2.name].buildable_to == false then
  87                                         -- Add dropped items
  88                                         local drops = core.get_node_drops(n2.name, "")
  89                                         local _, dropped_item
  90                                         for _, dropped_item in ipairs(drops) do
  91                                                 core.add_item(np, dropped_item)
  92                                         end
  93                                 end
  94                                 -- Run script hook
  95                                 local _, callback
  96                                 for _, callback in ipairs(core.registered_on_dignodes) do
  97                                         callback(np, n2, nil)
  98                                 end
  99                         end
 100                         -- Create node and remove entity
 101                         core.add_node(np, self.node)
 102                         self.object:remove()
 103                         nodeupdate(np)
 104                         return
 105                 end
 106                 local vel = self.object:getvelocity()
 107                 if vector.equals(vel, {x=0,y=0,z=0}) then
 108                         local npos = self.object:getpos()
 109                         self.object:setpos(vector.round(npos))
 110                 end
 111         end
 112 })
 113
 114 function spawn_falling_node(p, node)
 115         obj = core.add_entity(p, "__builtin:falling_node")
 116         obj:get_luaentity():set_node(node)
 117 end
 118
 119 function drop_attached_node(p)
 120         local nn = core.get_node(p).name
 121         core.remove_node(p)
 122         for _,item in ipairs(core.get_node_drops(nn, "")) do
 123                 local pos = {
 124                         x = p.x + math.random()/2 - 0.25,
 125                         y = p.y + math.random()/2 - 0.25,
 126                         z = p.z + math.random()/2 - 0.25,
 127                 }
 128                 core.add_item(pos, item)
 129         end
 130 end
 131
 132 function check_attached_node(p, n)
 133         local def = core.registered_nodes[n.name]
 134         local d = {x=0, y=0, z=0}
 135         if def.paramtype2 == "wallmounted" then
 136                 if n.param2 == 0 then
 137                         d.y = 1
 138                 elseif n.param2 == 1 then
 139                         d.y = -1
 140                 elseif n.param2 == 2 then
 141                         d.x = 1
 142                 elseif n.param2 == 3 then
 143                         d.x = -1
 144                 elseif n.param2 == 4 then
 145                         d.z = 1
 146                 elseif n.param2 == 5 then
 147                         d.z = -1
 148                 end
 149         else
 150                 d.y = -1
 151         end
 152         local p2 = {x=p.x+d.x, y=p.y+d.y, z=p.z+d.z}
 153         local nn = core.get_node(p2).name
 154         local def2 = core.registered_nodes[nn]
 155         if def2 and not def2.walkable then
 156                 return false
 157         end
 158         return true
 159 end
 160
 161 --
 162 -- Some common functions
 163 --
 164
 165 function nodeupdate_single(p, delay)
 166         n = core.get_node(p)
 167         if core.get_item_group(n.name, "falling_node") ~= 0 then
 168                 p_bottom = {x=p.x, y=p.y-1, z=p.z}
 169                 n_bottom = core.get_node(p_bottom)
 170                 -- Note: walkable is in the node definition, not in item groups
 171                 if core.registered_nodes[n_bottom.name] and
 172                                 (core.get_item_group(n.name, "float") == 0 or
 173                                         core.registered_nodes[n_bottom.name].liquidtype == "none") and
 174                                 (n.name ~= n_bottom.name or (core.registered_nodes[n_bottom.name].leveled and
 175                                         core.get_node_level(p_bottom) < core.get_node_max_level(p_bottom))) and
 176                                 (not core.registered_nodes[n_bottom.name].walkable or
 177                                         core.registered_nodes[n_bottom.name].buildable_to) then
 178                         if delay then
 179                                 core.after(0.1, nodeupdate_single, {x=p.x, y=p.y, z=p.z}, false)
 180                         else
 181                                 n.level = core.get_node_level(p)
 182                                 core.remove_node(p)
 183                                 spawn_falling_node(p, n)
 184                                 nodeupdate(p)
 185                         end
 186                 end
 187         end
 188
 189         if core.get_item_group(n.name, "attached_node") ~= 0 then
 190                 if not check_attached_node(p, n) then
 191                         drop_attached_node(p)
 192                         nodeupdate(p)
 193                 end
 194         end
 195 end
 196
 197 function nodeupdate(p, delay)
 198         -- Round p to prevent falling entities to get stuck
 199         p.x = math.floor(p.x+0.5)
 200         p.y = math.floor(p.y+0.5)
 201         p.z = math.floor(p.z+0.5)
 202
 203         for x = -1,1 do
 204         for y = -1,1 do
 205         for z = -1,1 do
 206                 nodeupdate_single({x=p.x+x, y=p.y+y, z=p.z+z}, delay or not (x==0 and y==0 and z==0))
 207         end
 208         end
 209         end
 210 end
 211
 212 --
 213 -- Global callbacks
 214 --
 215
 216 function on_placenode(p, node)
 217         nodeupdate(p)
 218 end
 219 core.register_on_placenode(on_placenode)
 220
 221 function on_dignode(p, node)
 222         nodeupdate(p)
 223 end
 224 core.register_on_dignode(on_dignode)