Minetest-WorldEditAdditions/worldeditadditions/lib/replacemix.lua

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local wea_c = worldeditadditions_core
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local Vector3 = wea_c.Vector3
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--- Like //mix, but replaces a given node instead.
-- TODO: Implement //replacesplat, which picks seeder nodes with a percentage chance, and then some growth passes with e.g. cellular automata? We should probably be pushing towards a release though round about now
-- @param pos1 Vector3 pos1 of the defined region to replace nodes in.
-- @param pos2 Vector3 pos2 of the defined region to replace nodes in.
-- @param target_node string The normalised name of the node to replace.
-- @param target_node_chance number The chance that the target_node should be replaced. This is a 1-in-N chance, so far example a value of 4 would be a 1 in 4 chance of replacement = 25% chance.
-- @param replacements table<string,number> A map of normalised node names to relative weights for the nodes to replace `target_node` with. Nodes with higher weights will be chosen to replace `target_node` more often.
-- @returns bool,number,number,table<number,number> 1. Whether the operation was successful or not.
-- 2. The number of nodes actually placed.
-- 3. The number of nodes that *could* have been replaced if `target_node_chance` were set to 1.
-- 4. A map of node ids to the number of times that node was placed.
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function worldeditadditions.replacemix(pos1, pos2, target_node, target_node_chance, replacements)
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pos1, pos2 = Vector3.sort(pos1, pos2)
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-- 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()
local node_id_target = minetest.get_content_id(target_node)
-- Initialise statistics
local changed = 0
local candidates = 0
local distribution = {}
-- Generate the list of node ids
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local node_ids_replace, node_ids_replace_count = wea_c.make_weighted(replacements)
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for node_name, weight in pairs(replacements) do
distribution[minetest.get_content_id(node_name)] = 0
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end
for i in area:iterp(pos1, pos2) do
if data[i] == node_id_target then
candidates = candidates + 1
if math.random(target_node_chance) == 1 then
local next_id = node_ids_replace[math.random(node_ids_replace_count)]
data[i] = next_id
changed = changed + 1
-- We initialised this above
distribution[next_id] = distribution[next_id] + 1
end
end
end
-- Save the modified nodes back to disk & return
worldedit.manip_helpers.finish(manip, data)
return true, changed, candidates, distribution
end