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