mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-09-12 08:08:30 +02:00
127 lines
4.4 KiB
Lua
127 lines
4.4 KiB
Lua
--- Flood-fill command for complex lakes etc.
|
|
-- @module worldeditadditions.floodfill
|
|
|
|
-------------------------------------------------------------------------------
|
|
--- A Queue implementation, taken & adapted from https://www.lua.org/pil/11.4.html
|
|
-- @submodule worldeditadditions.utils.queue
|
|
|
|
local Queue = {}
|
|
function Queue.new()
|
|
return { first = 0, last = -1 }
|
|
end
|
|
|
|
function Queue.enqueue(queue, value)
|
|
local new_last = queue.last + 1
|
|
queue.last = new_last
|
|
queue[new_last] = value
|
|
end
|
|
|
|
function Queue.contains(queue, value)
|
|
for i=queue.first,queue.last do
|
|
if queue[i] == value then
|
|
return true
|
|
end
|
|
end
|
|
return false
|
|
end
|
|
|
|
function Queue.is_empty(queue)
|
|
return queue.first > queue.last
|
|
end
|
|
|
|
function Queue.dequeue(queue)
|
|
local first = queue.first
|
|
if Queue.is_empty(queue) then
|
|
error("Error: The queue is empty!")
|
|
end
|
|
|
|
local value = queue[first]
|
|
queue[first] = nil -- Help the garbage collector out
|
|
queue.first = first + 1
|
|
return value
|
|
end
|
|
|
|
-------------------------------------------------------------------------------
|
|
|
|
function worldedit.floodfill(start_pos, radius, replace_node)
|
|
-- Calculate the area we want to modify
|
|
local pos1 = vector.add(start_pos, { x = radius, y = 0, z = radius })
|
|
local pos2 = vector.subtract(start_pos, { x = radius, y = radius, z = radius })
|
|
pos1, pos2 = worldedit.sort_pos(pos1, pos2)
|
|
-- pos2 will always have the highest co-ordinates now
|
|
|
|
|
|
-- Fetch the nodes in the specified area
|
|
local manip, area = worldedit.manip_helpers.init(pos1, pos2)
|
|
local data = manip:get_data()
|
|
|
|
-- Setup for the floodfill operation itself
|
|
local start_pos_index = area:index(start_pos.x, start_pos.y, start_pos.z)
|
|
|
|
local search_id = data[start_pos_index]
|
|
local replace_id = minetest.get_content_id(replace_node)
|
|
local radius_sq = radius*radius
|
|
|
|
if search_id == replace_id then
|
|
return false
|
|
end
|
|
|
|
local count = 0
|
|
local remaining_nodes = Queue.new()
|
|
Queue.enqueue(remaining_nodes, start_pos_index)
|
|
|
|
-- Do the floodfill
|
|
while Queue.is_empty(remaining_nodes) == false do
|
|
local cur = Queue.dequeue(remaining_nodes)
|
|
|
|
-- Replace this node
|
|
data[cur] = replace_id
|
|
count = count + 1
|
|
|
|
-- Check all the nearby nodes
|
|
-- We don't need to go upwards here, since we're filling in lake-style
|
|
local xplus = cur + 1 -- +X
|
|
if data[xplus] == search_id and
|
|
worldeditadditions.vector.lengthsquared(vector.subtract(area:position(xplus), start_pos)) < radius_sq and
|
|
not Queue.contains(remaining_nodes, xplus) then
|
|
-- minetest.log("action", "[floodfill] [+X] index " .. xplus .. " is a " .. data[xplus] .. ", searching for a " .. search_id)
|
|
Queue.enqueue(remaining_nodes, xplus)
|
|
end
|
|
local xminus = cur - 1 -- -X
|
|
if data[xminus] == search_id and
|
|
worldeditadditions.vector.lengthsquared(vector.subtract(area:position(xminus), start_pos)) < radius_sq and
|
|
not Queue.contains(remaining_nodes, xminus) then
|
|
-- minetest.log("action", "[floodfill] [-X] index " .. xminus .. " is a " .. data[xminus] .. ", searching for a " .. search_id)
|
|
Queue.enqueue(remaining_nodes, xminus)
|
|
end
|
|
local zplus = cur + area.zstride -- +Z
|
|
if data[zplus] == search_id and
|
|
worldeditadditions.vector.lengthsquared(vector.subtract(area:position(zplus), start_pos)) < radius_sq and
|
|
not Queue.contains(remaining_nodes, zplus) then
|
|
-- minetest.log("action", "[floodfill] [+Z] index " .. zplus .. " is a " .. data[zplus] .. ", searching for a " .. search_id)
|
|
Queue.enqueue(remaining_nodes, zplus)
|
|
end
|
|
local zminus = cur - area.zstride -- -Z
|
|
if data[zminus] == search_id and
|
|
worldeditadditions.vector.lengthsquared(vector.subtract(area:position(zminus), start_pos)) < radius_sq and
|
|
not Queue.contains(remaining_nodes, zminus) then
|
|
-- minetest.log("action", "[floodfill] [-Z] index " .. zminus .. " is a " .. data[zminus] .. ", searching for a " .. search_id)
|
|
Queue.enqueue(remaining_nodes, zminus)
|
|
end
|
|
local yminus = cur - area.ystride -- -Y
|
|
if data[yminus] == search_id and
|
|
worldeditadditions.vector.lengthsquared(vector.subtract(area:position(yminus), start_pos)) < radius_sq and
|
|
not Queue.contains(remaining_nodes, yminus) then
|
|
-- minetest.log("action", "[floodfill] [-Y] index " .. yminus .. " is a " .. data[yminus] .. ", searching for a " .. search_id)
|
|
Queue.enqueue(remaining_nodes, yminus)
|
|
end
|
|
|
|
count = count + 1
|
|
end
|
|
|
|
-- Save the modified nodes back to disk & return
|
|
worldedit.manip_helpers.finish(manip, data)
|
|
|
|
return count
|
|
end
|