mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-11-24 08:03:46 +01:00
118 lines
3.5 KiB
Lua
118 lines
3.5 KiB
Lua
--- Copies a region to another location, potentially overwriting the exiting region.
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-- @module worldeditadditions.copy
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local wea = worldeditadditions
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local Vector3 = wea.Vector3
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-- ███ ███ ██████ ██ ██ ███████
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-- ████ ████ ██ ██ ██ ██ ██
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-- ██ ████ ██ ██ ██ ██ ██ █████
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-- ██ ██ ██ ██ ██ ██ ██ ██
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-- ██ ██ ██████ ████ ███████
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function worldeditadditions.move(source_pos1, source_pos2, target_pos1, target_pos2)
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---
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-- 0: Preamble
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---
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source_pos1, source_pos2 = Vector3.sort(source_pos1, source_pos2)
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target_pos1, target_pos2 = Vector3.sort(target_pos1, target_pos2)
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local offset = source_pos1:subtract(target_pos1)
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-- {source,target}_pos2 will always have the highest co-ordinates now
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local node_id_air = minetest.get_content_id("air")
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-- Fetch the nodes in the source area
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local manip_source, area_source = worldedit.manip_helpers.init(source_pos1, source_pos2)
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local data_source = manip_source:get_data()
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-- Fetch a manip for the target area
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local manip_target, area_target = worldedit.manip_helpers.init(target_pos1, target_pos2)
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local data_target = manip_target:get_data()
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---
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-- 1: Perform Copy
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---
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-- z y x is the preferred loop order (because CPU cache, since then we're iterating linearly through the data array backwards. This only holds true for little-endian machines however)
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for z = source_pos2.z, source_pos1.z, -1 do
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for y = source_pos2.y, source_pos1.y, -1 do
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for x = source_pos2.x, source_pos1.x, -1 do
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local source = Vector3.new(x, y, z)
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local source_i = area_source:index(x, y, z)
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local target = source:subtract(offset)
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local target_i = area_target:index(target.x, target.y, target.z)
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data_target[target_i] = data_source[source_i]
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end
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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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-- Note that we save the source region *first* to avoid issues with overlap
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-- BUG: Voxel Manipulators cover a larger area than the source area if the target position is too close the to the source, then the source will be overwritten by the target by accident.
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-- Potential solution:
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-- 1. Grab source & target
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-- 2. Perform copy → target
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-- 3. Save target
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-- 4. Re-grab source
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-- 5. Zero out source, but avoiding touching any nodes that fall within target
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-- 6. Save source
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---
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-- 2: Save target
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---
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worldedit.manip_helpers.finish(manip_target, data_target)
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---
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-- 3: Re-grab source
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---
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manip_source, area_source = worldedit.manip_helpers.init(source_pos1, source_pos2)
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data_source = manip_source:get_data()
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---
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-- 4: Zero out source, but avoiding touching any nodes that fall within target
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---
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for z = source_pos2.z, source_pos1.z, -1 do
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for y = source_pos2.y, source_pos1.y, -1 do
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for x = source_pos2.x, source_pos1.x, -1 do
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local source = Vector3.new(x, y, z)
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local source_i = area_source:index(x, y, z)
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local target = source:subtract(offset)
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local target_i = area_target:index(target.x, target.y, target.z)
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if not source:is_contained(target_pos1, target_pos2) then
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data_source[source_i] = node_id_air
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end
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end
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end
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end
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---
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-- 5: Save source
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---
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worldedit.manip_helpers.finish(manip_source, data_source)
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---
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-- 6: Finish up and return
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---
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return true, worldedit.volume(target_pos1, target_pos2)
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end
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