builtin/falling.lua

   1 -- Minetest: builtin/item.lua
   2
   3 --
   4 -- Falling stuff
   5 --
   6
   7 minetest.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         nodename = "",
  18
  19         set_node = function(self, nodename)
  20                 self.nodename = nodename
  21                 local stack = ItemStack(nodename)
  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 minetest.registered_items[itemname] then
  30                         item_texture = minetest.registered_items[itemname].inventory_image
  31                         item_type = minetest.registered_items[itemname].type
  32                 end
  33                 prop = {
  34                         is_visible = true,
  35                         textures = {nodename},
  36                 }
  37                 self.object:set_properties(prop)
  38         end,
  39
  40         get_staticdata = function(self)
  41                 return self.nodename
  42         end,
  43
  44         on_activate = function(self, staticdata)
  45                 self.nodename = staticdata
  46                 self.object:set_armor_groups({immortal=1})
  47                 --self.object:setacceleration({x=0, y=-10, z=0})
  48                 self:set_node(self.nodename)
  49         end,
  50
  51         on_step = function(self, dtime)
  52                 -- Set gravity
  53                 self.object:setacceleration({x=0, y=-10, z=0})
  54                 -- Turn to actual sand when collides to ground or just move
  55                 local pos = self.object:getpos()
  56                 local bcp = {x=pos.x, y=pos.y-0.7, z=pos.z} -- Position of bottom center point
  57                 local bcn = minetest.get_node(bcp)
  58                 -- Note: walkable is in the node definition, not in item groups
  59                 if minetest.registered_nodes[bcn.name] and
  60                                 minetest.registered_nodes[bcn.name].walkable then
  61                         if minetest.registered_nodes[bcn.name].buildable_to then
  62                                 minetest.remove_node(bcp)
  63                                 return
  64                         end
  65                         local np = {x=bcp.x, y=bcp.y+1, z=bcp.z}
  66                         -- Check what's here
  67                         local n2 = minetest.get_node(np)
  68                         -- If it's not air or liquid, remove node and replace it with
  69                         -- it's drops
  70                         if n2.name ~= "air" and (not minetest.registered_nodes[n2.name] or
  71                                         minetest.registered_nodes[n2.name].liquidtype == "none") then
  72                                 local drops = minetest.get_node_drops(n2.name, "")
  73                                 minetest.remove_node(np)
  74                                 -- Add dropped items
  75                                 local _, dropped_item
  76                                 for _, dropped_item in ipairs(drops) do
  77                                         minetest.add_item(np, dropped_item)
  78                                 end
  79                                 -- Run script hook
  80                                 local _, callback
  81                                 for _, callback in ipairs(minetest.registered_on_dignodes) do
  82                                         callback(np, n2, nil)
  83                                 end
  84                         end
  85                         -- Create node and remove entity
  86                         minetest.add_node(np, {name=self.nodename})
  87                         self.object:remove()
  88                         nodeupdate(np)
  89                 else
  90                         -- Do nothing
  91                 end
  92         end
  93 })
  94
  95 function spawn_falling_node(p, nodename)
  96         obj = minetest.add_entity(p, "__builtin:falling_node")
  97         obj:get_luaentity():set_node(nodename)
  98 end
  99
 100 function drop_attached_node(p)
 101         local nn = minetest.get_node(p).name
 102         minetest.remove_node(p)
 103         for _,item in ipairs(minetest.get_node_drops(nn, "")) do
 104                 local pos = {
 105                         x = p.x + math.random()/2 - 0.25,
 106                         y = p.y + math.random()/2 - 0.25,
 107                         z = p.z + math.random()/2 - 0.25,
 108                 }
 109                 minetest.add_item(pos, item)
 110         end
 111 end
 112
 113 function check_attached_node(p, n)
 114         local def = minetest.registered_nodes[n.name]
 115         local d = {x=0, y=0, z=0}
 116         if def.paramtype2 == "wallmounted" then
 117                 if n.param2 == 0 then
 118                         d.y = 1
 119                 elseif n.param2 == 1 then
 120                         d.y = -1
 121                 elseif n.param2 == 2 then
 122                         d.x = 1
 123                 elseif n.param2 == 3 then
 124                         d.x = -1
 125                 elseif n.param2 == 4 then
 126                         d.z = 1
 127                 elseif n.param2 == 5 then
 128                         d.z = -1
 129                 end
 130         else
 131                 d.y = -1
 132         end
 133         local p2 = {x=p.x+d.x, y=p.y+d.y, z=p.z+d.z}
 134         local nn = minetest.get_node(p2).name
 135         local def2 = minetest.registered_nodes[nn]
 136         if def2 and not def2.walkable then
 137                 return false
 138         end
 139         return true
 140 end
 141
 142 --
 143 -- Some common functions
 144 --
 145
 146 function nodeupdate_single(p, delay)
 147         n = minetest.get_node(p)
 148         if minetest.get_node_group(n.name, "falling_node") ~= 0 then
 149                 p_bottom = {x=p.x, y=p.y-1, z=p.z}
 150                 n_bottom = minetest.get_node(p_bottom)
 151                 -- Note: walkable is in the node definition, not in item groups
 152                 if minetest.registered_nodes[n_bottom.name] and
 153                                 (not minetest.registered_nodes[n_bottom.name].walkable or
 154                                         minetest.registered_nodes[n_bottom.name].buildable_to) then
 155                         if delay then
 156                                 minetest.after(0.1, nodeupdate_single, {x=p.x, y=p.y, z=p.z}, false)
 157                         else
 158                                 minetest.remove_node(p)
 159                                 spawn_falling_node(p, n.name)
 160                                 nodeupdate(p)
 161                         end
 162                 end
 163         end
 164
 165         if minetest.get_node_group(n.name, "attached_node") ~= 0 then
 166                 if not check_attached_node(p, n) then
 167                         drop_attached_node(p)
 168                         nodeupdate(p)
 169                 end
 170         end
 171 end
 172
 173 function nodeupdate(p)
 174         -- Round p to prevent falling entities to get stuck
 175         p.x = math.floor(p.x+0.5)
 176         p.y = math.floor(p.y+0.5)
 177         p.z = math.floor(p.z+0.5)
 178
 179         for x = -1,1 do
 180         for y = -1,1 do
 181         for z = -1,1 do
 182                 nodeupdate_single({x=p.x+x, y=p.y+y, z=p.z+z}, not (x==0 and y==0 and z==0))
 183         end
 184         end
 185         end
 186 end
 187
 188 --
 189 -- Global callbacks
 190 --
 191
 192 function on_placenode(p, node)
 193         nodeupdate(p)
 194 end
 195 minetest.register_on_placenode(on_placenode)
 196
 197 function on_dignode(p, node)
 198         nodeupdate(p)
 199 end
 200 minetest.register_on_dignode(on_dignode)