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.object:setacceleration({x=0, y=-10, z=0})
  47                 self:set_node({name=staticdata})
  48         end,
  49
  50         on_step = function(self, dtime)
  51                 -- Set gravity
  52                 self.object:setacceleration({x=0, y=-10, z=0})
  53                 -- Turn to actual sand when collides to ground or just move
  54                 local pos = self.object:getpos()
  55                 local bcp = {x=pos.x, y=pos.y-0.7, z=pos.z} -- Position of bottom center point
  56                 local bcn = core.get_node(bcp)
  57                 local bcd = core.registered_nodes[bcn.name]
  58                 -- Note: walkable is in the node definition, not in item groups
  59                 if not bcd or
  60                                 (bcd.walkable or
  61                                 (core.get_item_group(self.node.name, "float") ~= 0 and
  62                                 bcd.liquidtype ~= "none")) then
  63                         if bcd and bcd.leveled and
  64                                         bcn.name == self.node.name then
  65                                 local addlevel = self.node.level
  66                                 if addlevel == nil or addlevel <= 0 then
  67                                         addlevel = bcd.leveled
  68                                 end
  69                                 if core.add_node_level(bcp, addlevel) == 0 then
  70                                         self.object:remove()
  71                                         return
  72                                 end
  73                         elseif bcd and bcd.buildable_to and
  74                                         (core.get_item_group(self.node.name, "float") == 0 or
  75                                         bcd.liquidtype == "none") then
  76                                 core.remove_node(bcp)
  77                                 return
  78                         end
  79                         local np = {x=bcp.x, y=bcp.y+1, z=bcp.z}
  80                         -- Check what's here
  81                         local n2 = core.get_node(np)
  82                         -- If it's not air or liquid, remove node and replace it with
  83                         -- it's drops
  84                         if n2.name ~= "air" and (not core.registered_nodes[n2.name] or
  85                                         core.registered_nodes[n2.name].liquidtype == "none") then
  86                                 core.remove_node(np)
  87                                 if core.registered_nodes[n2.name].buildable_to == false then
  88                                         -- Add dropped items
  89                                         local drops = core.get_node_drops(n2.name, "")
  90                                         local _, dropped_item
  91                                         for _, dropped_item in ipairs(drops) do
  92                                                 core.add_item(np, dropped_item)
  93                                         end
  94                                 end
  95                                 -- Run script hook
  96                                 local _, callback
  97                                 for _, callback in ipairs(core.registered_on_dignodes) do
  98                                         callback(np, n2, nil)
  99                                 end
 100                         end
 101                         -- Create node and remove entity
 102                         core.add_node(np, self.node)
 103                         self.object:remove()
 104                         nodeupdate(np)
 105                 else
 106                         -- Do nothing
 107                 end
 108         end
 109 })
 110
 111 function spawn_falling_node(p, node)
 112         obj = core.add_entity(p, "__builtin:falling_node")
 113         obj:get_luaentity():set_node(node)
 114 end
 115
 116 function drop_attached_node(p)
 117         local nn = core.get_node(p).name
 118         core.remove_node(p)
 119         for _,item in ipairs(core.get_node_drops(nn, "")) do
 120                 local pos = {
 121                         x = p.x + math.random()/2 - 0.25,
 122                         y = p.y + math.random()/2 - 0.25,
 123                         z = p.z + math.random()/2 - 0.25,
 124                 }
 125                 core.add_item(pos, item)
 126         end
 127 end
 128
 129 function check_attached_node(p, n)
 130         local def = core.registered_nodes[n.name]
 131         local d = {x=0, y=0, z=0}
 132         if def.paramtype2 == "wallmounted" then
 133                 if n.param2 == 0 then
 134                         d.y = 1
 135                 elseif n.param2 == 1 then
 136                         d.y = -1
 137                 elseif n.param2 == 2 then
 138                         d.x = 1
 139                 elseif n.param2 == 3 then
 140                         d.x = -1
 141                 elseif n.param2 == 4 then
 142                         d.z = 1
 143                 elseif n.param2 == 5 then
 144                         d.z = -1
 145                 end
 146         else
 147                 d.y = -1
 148         end
 149         local p2 = {x=p.x+d.x, y=p.y+d.y, z=p.z+d.z}
 150         local nn = core.get_node(p2).name
 151         local def2 = core.registered_nodes[nn]
 152         if def2 and not def2.walkable then
 153                 return false
 154         end
 155         return true
 156 end
 157
 158 --
 159 -- Some common functions
 160 --
 161
 162 function nodeupdate_single(p, delay)
 163         n = core.get_node(p)
 164         if core.get_item_group(n.name, "falling_node") ~= 0 then
 165                 p_bottom = {x=p.x, y=p.y-1, z=p.z}
 166                 n_bottom = core.get_node(p_bottom)
 167                 -- Note: walkable is in the node definition, not in item groups
 168                 if core.registered_nodes[n_bottom.name] and
 169                                 (core.get_item_group(n.name, "float") == 0 or
 170                                         core.registered_nodes[n_bottom.name].liquidtype == "none") and
 171                                 (n.name ~= n_bottom.name or (core.registered_nodes[n_bottom.name].leveled and
 172                                         core.get_node_level(p_bottom) < core.get_node_max_level(p_bottom))) and
 173                                 (not core.registered_nodes[n_bottom.name].walkable or
 174                                         core.registered_nodes[n_bottom.name].buildable_to) then
 175                         if delay then
 176                                 core.after(0.1, nodeupdate_single, {x=p.x, y=p.y, z=p.z}, false)
 177                         else
 178                                 n.level = core.env:get_node_level(p)
 179                                 core.remove_node(p)
 180                                 spawn_falling_node(p, n)
 181                                 nodeupdate(p)
 182                         end
 183                 end
 184         end
 185
 186         if core.get_item_group(n.name, "attached_node") ~= 0 then
 187                 if not check_attached_node(p, n) then
 188                         drop_attached_node(p)
 189                         nodeupdate(p)
 190                 end
 191         end
 192 end
 193
 194 function nodeupdate(p, delay)
 195         -- Round p to prevent falling entities to get stuck
 196         p.x = math.floor(p.x+0.5)
 197         p.y = math.floor(p.y+0.5)
 198         p.z = math.floor(p.z+0.5)
 199
 200         for x = -1,1 do
 201         for y = -1,1 do
 202         for z = -1,1 do
 203                 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))
 204         end
 205         end
 206         end
 207 end
 208
 209 --
 210 -- Global callbacks
 211 --
 212
 213 function on_placenode(p, node)
 214         nodeupdate(p)
 215 end
 216 core.register_on_placenode(on_placenode)
 217
 218 function on_dignode(p, node)
 219         nodeupdate(p)
 220 end
 221 core.register_on_dignode(on_dignode)