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Intersects_protection(): Move from Minetest Game to builtin (#6952)
A useful function that applies 'core.is_protected()' to a 3D lattice of points evenly spaced throughout a defined volume, with a parameter for the maximum spacing of points.
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@ -40,14 +40,17 @@ function core.check_player_privs(name, ...)
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return true, ""
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end
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local player_list = {}
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function core.send_join_message(player_name)
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if not minetest.is_singleplayer() then
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core.chat_send_all("*** " .. player_name .. " joined the game.")
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end
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end
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function core.send_leave_message(player_name, timed_out)
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local announcement = "*** " .. player_name .. " left the game."
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if timed_out then
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@ -56,18 +59,21 @@ function core.send_leave_message(player_name, timed_out)
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core.chat_send_all(announcement)
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end
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core.register_on_joinplayer(function(player)
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local player_name = player:get_player_name()
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player_list[player_name] = player
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core.send_join_message(player_name)
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end)
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core.register_on_leaveplayer(function(player, timed_out)
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local player_name = player:get_player_name()
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player_list[player_name] = nil
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core.send_leave_message(player_name, timed_out)
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end)
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function core.get_connected_players()
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local temp_table = {}
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for index, value in pairs(player_list) do
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@ -78,12 +84,15 @@ function core.get_connected_players()
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return temp_table
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end
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function minetest.player_exists(name)
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return minetest.get_auth_handler().get_auth(name) ~= nil
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end
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-- Returns two position vectors representing a box of `radius` in each
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-- direction centered around the player corresponding to `player_name`
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function core.get_player_radius_area(player_name, radius)
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local player = core.get_player_by_name(player_name)
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if player == nil then
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@ -101,10 +110,12 @@ function core.get_player_radius_area(player_name, radius)
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return p1, p2
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end
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function core.hash_node_position(pos)
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return (pos.z+32768)*65536*65536 + (pos.y+32768)*65536 + pos.x+32768
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end
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function core.get_position_from_hash(hash)
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local pos = {}
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pos.x = (hash%65536) - 32768
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@ -115,6 +126,7 @@ function core.get_position_from_hash(hash)
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return pos
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end
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function core.get_item_group(name, group)
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if not core.registered_items[name] or not
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core.registered_items[name].groups[group] then
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@ -123,11 +135,13 @@ function core.get_item_group(name, group)
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return core.registered_items[name].groups[group]
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end
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function core.get_node_group(name, group)
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core.log("deprecated", "Deprecated usage of get_node_group, use get_item_group instead")
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return core.get_item_group(name, group)
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end
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function core.setting_get_pos(name)
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local value = core.settings:get(name)
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if not value then
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@ -136,17 +150,64 @@ function core.setting_get_pos(name)
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return core.string_to_pos(value)
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end
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-- To be overriden by protection mods
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function core.is_protected(pos, name)
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return false
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end
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function core.record_protection_violation(pos, name)
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for _, func in pairs(core.registered_on_protection_violation) do
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func(pos, name)
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end
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end
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-- Checks if specified volume intersects a protected volume
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function core.intersects_protection(minp, maxp, player_name, interval)
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-- 'interval' is the largest allowed interval for the 3D lattice of checks.
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-- Compute the optimal float step 'd' for each axis so that all corners and
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-- borders are checked. 'd' will be smaller or equal to 'interval'.
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-- Subtracting 1e-4 ensures that the max co-ordinate will be reached by the
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-- for loop (which might otherwise not be the case due to rounding errors).
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-- Default to 4
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interval = interval or 4
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local d = {}
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for _, c in pairs({"x", "y", "z"}) do
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if maxp[c] > minp[c] then
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d[c] = (maxp[c] - minp[c]) /
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math.ceil((maxp[c] - minp[c]) / interval) - 1e-4
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elseif maxp[c] == minp[c] then
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d[c] = 1 -- Any value larger than 0 to avoid division by zero
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else -- maxp[c] < minp[c], print error and treat as protection intersected
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minetest.log("error", "maxp < minp in 'minetest.intersects_protection()'")
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return true
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end
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end
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for zf = minp.z, maxp.z, d.z do
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local z = math.floor(zf + 0.5)
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for yf = minp.y, maxp.y, d.y do
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local y = math.floor(yf + 0.5)
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for xf = minp.x, maxp.x, d.x do
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local x = math.floor(xf + 0.5)
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if core.is_protected({x = x, y = y, z = z}, player_name) then
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return true
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end
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end
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end
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end
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return false
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end
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local raillike_ids = {}
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local raillike_cur_id = 0
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function core.raillike_group(name)
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@ -159,7 +220,9 @@ function core.raillike_group(name)
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return id
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end
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-- HTTP callback interface
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function core.http_add_fetch(httpenv)
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httpenv.fetch = function(req, callback)
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local handle = httpenv.fetch_async(req)
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@ -178,11 +241,12 @@ function core.http_add_fetch(httpenv)
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return httpenv
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end
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function core.close_formspec(player_name, formname)
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return minetest.show_formspec(player_name, formname, "")
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end
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function core.cancel_shutdown_requests()
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core.request_shutdown("", false, -1)
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end
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@ -3413,6 +3413,16 @@ These functions return the leftover itemstack.
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* `minetest.record_protection_violation(pos, name)`
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* This function calls functions registered with
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`minetest.register_on_protection_violation`.
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* `minetest.intersects_protection(minp, maxp, player_name, interval)
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* Returns a boolean, returns true if the volume defined by `minp` and `maxp`
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intersects a protected area not owned by `player_name`.
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* Applies `is_protected()` to a 3D lattice of points in the defined volume.
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The points are spaced evenly throughout the volume and have a spacing
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similar to, but no larger than, `interval`.
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* All corners and edges of the defined volume are checked.
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* `interval` defaults to 4.
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* `interval` should be carefully chosen and maximised to avoid an excessive
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number of points being checked.
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* `minetest.rotate_and_place(itemstack, placer, pointed_thing, infinitestacks, orient_flags)`
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* Attempt to predict the desired orientation of the facedir-capable node
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defined by `itemstack`, and place it accordingly (on-wall, on the floor, or
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