mods/screwdriver/init.lua

   1
   2 --[[
   3
   4   screwdriver - Copyright (C) RealBadAngel, minetest developers
   5
   6   This library is free software; you can redistribute it and/or
   7   modify it under the terms of the GNU Lesser General Public License
   8   as published by the Free Software Foundation; either version 2.1
   9   of the License, or (at your option) any later version.
  10
  11   This library is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with this library; if not, write to the Free
  18   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  19   MA 02111-1307 USA
  20
  21 ]]--
  22
  23 screwdriver = {}
  24
  25 local function nextrange(x, max)
  26         x = x + 1
  27         if x > max then
  28                 x = 0
  29         end
  30         return x
  31 end
  32
  33 screwdriver.ROTATE_FACE = 1
  34 screwdriver.ROTATE_AXIS = 2
  35 screwdriver.disallow = function(pos, node, user, mode, new_param2)
  36         return false
  37 end
  38 screwdriver.rotate_simple = function(pos, node, user, mode, new_param2)
  39         if mode ~= screwdriver.ROTATE_FACE then
  40                 return false
  41         end
  42 end
  43
  44 -- Handles rotation
  45 screwdriver.handler = function(itemstack, user, pointed_thing, mode, uses)
  46         if pointed_thing.type ~= "node" then
  47                 return
  48         end
  49
  50         local pos = pointed_thing.under
  51
  52         if not boxes.can_edit(user) then
  53                 return
  54         end
  55         if minetest.is_protected(pos, user:get_player_name()) then
  56                 minetest.record_protection_violation(pos, user:get_player_name())
  57                 return
  58         end
  59
  60         local node = minetest.get_node(pos)
  61         local ndef = minetest.registered_nodes[node.name]
  62         -- verify node is facedir (expected to be rotatable)
  63         if not ndef or ndef.paramtype2 ~= "facedir" then
  64                 return
  65         end
  66         -- Compute param2
  67         local rotationPart = node.param2 % 32 -- get first 4 bits
  68         local preservePart = node.param2 - rotationPart
  69         local axisdir = math.floor(rotationPart / 4)
  70         local rotation = rotationPart - axisdir * 4
  71         if mode == screwdriver.ROTATE_FACE then
  72                 rotationPart = axisdir * 4 + nextrange(rotation, 3)
  73         elseif mode == screwdriver.ROTATE_AXIS then
  74                 rotationPart = nextrange(axisdir, 5) * 4
  75         end
  76
  77         local new_param2 = preservePart + rotationPart
  78         local should_rotate = true
  79
  80         if ndef and ndef.on_rotate then
  81                 -- Node provides a handler, so let the handler decide instead if the node can be rotated
  82                 -- Copy pos and node because callback can modify it
  83                 local result = ndef.on_rotate(vector.new(pos),
  84                                 {name = node.name, param1 = node.param1, param2 = node.param2},
  85                                 user, mode, new_param2)
  86                 if result == false then -- Disallow rotation
  87                         return
  88                 elseif result == true then
  89                         should_rotate = false
  90                 end
  91         else
  92                 if not ndef or not ndef.paramtype2 == "facedir" or
  93                                 ndef.on_rotate == false or
  94                                 (ndef.drawtype == "nodebox" and
  95                                 not ndef.node_box.type == "fixed") or
  96                                 node.param2 == nil then
  97                         return
  98                 end
  99
 100                 if ndef.can_dig and not ndef.can_dig(pos, user) then
 101                         return
 102                 end
 103         end
 104
 105         if should_rotate then
 106                 node.param2 = new_param2
 107                 minetest.swap_node(pos, node)
 108         end
 109
 110         return itemstack
 111 end
 112
 113 -- Screwdriver
 114 minetest.register_tool("screwdriver:screwdriver", {
 115         description = "Screwdriver\nLeft-click rotates face\nRight-click rotates axis",
 116         inventory_image = "screwdriver.png",
 117         on_use = function(itemstack, user, pointed_thing)
 118                 screwdriver.handler(itemstack, user, pointed_thing, screwdriver.ROTATE_FACE, 200)
 119                 return itemstack
 120         end,
 121         on_place = function(itemstack, user, pointed_thing)
 122                 screwdriver.handler(itemstack, user, pointed_thing, screwdriver.ROTATE_AXIS, 200)
 123                 return itemstack
 124         end,
 125 })
 126