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https://github.com/sbrl/Minetest-WorldEditAdditions.git
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100 lines
2.9 KiB
Lua
100 lines
2.9 KiB
Lua
--- Flood-fill command for complex lakes etc.
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-- @module worldeditadditions.floodfill
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-------------------------------------------------------------------------------
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--- A Queue implementation, taken & adapted from https://www.lua.org/pil/11.4.html
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-- @submodule worldeditadditions.utils.queue
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local Queue = {}
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function Queue.new()
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return { first = 0, last = -1 }
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end
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function Queue.enqueue(queue, value)
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local new_last = queue.last + 1
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queue.last = new_last
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queue[new_last] = value
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end
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function Queue.is_empty(queue)
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return queue.first > queue.last
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end
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function Queue.dequeue(queue)
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local first = queue.first
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if Queue.is_empty(queue) then
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error("Error: The queue is empty!")
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end
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local value = queue[first]
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queue[first] = nil -- Help the garbage collector out
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queue.first = first + 1
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return value
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end
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-------------------------------------------------------------------------------
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function worldedit.floodfill(start_pos, radius, replace_node)
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-- Calculate the area we want to modify
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local pos1 = vector.add(start_pos, { x = radius, y = 0, z = radius })
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local pos2 = vector.subtract(start_pos, { x = radius, y = radius, z = radius })
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pos1, pos2 = worldedit.sort_pos(pos1, pos2) -- Just in case
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minetest.log("action", "radius: " .. radius)
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minetest.log("action", "pos1: (" .. pos1.x .. ", " .. pos1.y .. ", " .. pos1.z .. ")")
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minetest.log("action", "pos2: (" .. pos2.x .. ", " .. pos2.y .. ", " .. pos2.z .. ")")
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-- Fetch the nodes in the specified area
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local manip, area = worldedit.manip_helpers.init(pos1, pos2)
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local data = manip:get_data()
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-- Setup for the floodfill operation itself
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local start_pos_index = area:index(start_pos.x, start_pos.y, start_pos.z);
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local search_id = data[start_pos_index]
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local replace_id = minetest.get_content_id(replace_node)
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minetest.log("action", "ids: " .. search_id .. " -> " .. replace_id)
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local count = 0
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local remaining_nodes = Queue.new()
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Queue.enqueue(remaining_nodes, start_pos_index)
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-- Do the floodfill
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while Queue.is_empty(remaining_nodes) == false do
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local cur = Queue.dequeue(remaining_nodes)
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-- TODO: Check distance from start_pos
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-- Replace this node
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data[cur] = replace_id
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count = count + 1
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-- Check all the nearby nodes
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-- We don't need to go upwards here, since we're filling in lake-style
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if data[cur + 1] == search_id then -- +X
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Queue.enqueue(remaining_nodes, cur + 1)
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end
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if data[cur - 1] == search_id then -- -X
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Queue.enqueue(remaining_nodes, cur - 1)
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end
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if data[cur + area.zstride] == search_id then -- +Z
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Queue.enqueue(remaining_nodes, cur + area.zstride)
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end
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if data[cur - area.zstride] == search_id then -- -Z
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Queue.enqueue(remaining_nodes, cur - area.zstride)
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end
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if data[cur - area.ystride] == search_id then -- -Y
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Queue.enqueue(remaining_nodes, cur - area.ystride)
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end
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end
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-- Save the modified nodes back to disk & return
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worldedit.manip_helpers.finish(manip, data)
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return count
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end
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return floodfill
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