Mirrorlandia_minetest/Minetest-WorldEditAdditions
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Implement spiral square, but it's untested.

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It would also be awesome to customise the directional plane upon which 
the spiral is generated. It might actually be possible without melting 
my brain I think....


Looking at http://www.mathematische-basteleien.de/spiral.htm it should 
be possible to go this for circles too. But there's 1 particular 
function in Vector2.js that we need to port to Vector3.lua that we 
haven't yet which we'd need for that.....
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Starbeamrainbowlabs 2021-10-30 02:46:25 +01:00
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worldeditadditions/lib/spiral_square.lua Normal file
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local wea = worldeditadditions
local Vector3 = wea.Vector3
-- ███████ ██████ ██ ██████ █████ ██
-- ██ ██ ██ ██ ██ ██ ██ ██ ██
-- ███████ ██████ ██ ██████ ███████ ██
-- ██ ██ ██ ██ ██ ██ ██ ██
-- ███████ ██ ██ ██ ██ ██ ██ ███████
--
-- ███████ ██████ ██ ██ █████ ██████ ███████
-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
-- ███████ ██ ██ ██ ██ ███████ ██████ █████
-- ██ ██ ▄▄ ██ ██ ██ ██ ██ ██ ██ ██
-- ███████ ██████ ██████ ██ ██ ██ ██ ███████
-- ▀▀
--- Creates a square spiral that fills the defined region.
-- @param pos1 Vector3 The 1st position of the defined region.
-- @param pos2 Vector3 The 2nd position of the defined region.
-- @param target_node Vector3 The *normalised* name of the node to use to build the square spiral with.
-- @param interval number The distance between the walls of the spiral.
-- @param acceleration=0 number Increate the interval by this number every time we hit a corner of the square spiral.
-- @returns bool,number|string A success boolean value, followed by either the number of the nodes set or an error message string.
function worldeditadditions.spiral_square(pos1, pos2, target_node, interval, acceleration)
if not acceleration then acceleration = 0 end
pos1, pos2 = Vector3.sort(pos1, pos2)
local volume = pos2:subtract(pos1)
local volume_half = volume:divide(2)
print("DEBUG:spiral_square | pos1: "..pos1..", pos2: "..pos2..", target_node: "..target_node)
-- Fetch the nodes in the specified area
local manip, area = worldedit.manip_helpers.init(pos1, pos2)
local data = manip:get_data()
local node_id = minetest.get_content_id(target_node)
local count = 0 -- The number of nodes replaced
local centre = pos2:subtract(pos1):floor()
local pos_current = centre:clone()
local pos_corner_last = pos_current:clone()
local side_length = 0
local direction = Vector3.new(1, 0, 0)
local side_length_max = interval
while pos_current:is_contained(pos1, pos2) do
for y = pos2.y, pos1.y, -1 do
data[area:index(pos_current.x, y, pos_current.z)] = node_id
count = count + 1
end
pos_current = pos_current:add(direction)
side_length = side_length + 1
if side_length > side_length_max then
side_length_max = side_length_max + interval + acceleration
if direction.x == 0 and direction.z == 1 then
direction.x = 1
direction.z = 0
elseif direction.x == 1 and direction.z == 0 then
direction.x = 0
direction.z = -1
elseif direction.x == 0 and direction.z == -1 then
direction.x = -1
direction.z = 0
else
direction.x = 0
direction.z = 1
end
end
end
-- Save the modified nodes back to disk & return
worldedit.manip_helpers.finish(manip, data)
return true, count
end