mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-09-12 08:08:30 +02:00
194 lines
5.9 KiB
Lua
194 lines
5.9 KiB
Lua
--- Generates a maze.
|
|
-- Algorithm origin: https://starbeamrainbowlabs.com/blog/article.php?article=posts/070-Language-Review-Lua.html
|
|
-- @module worldeditadditions.maze
|
|
|
|
----------------------------------
|
|
-- function to print out the world
|
|
----------------------------------
|
|
function printspace3d(space, w, h, d)
|
|
for z = 0, d - 1, 1 do
|
|
for y = 0, h - 1, 1 do
|
|
local line = ""
|
|
for x = 0, w - 1, 1 do
|
|
line = line .. space[z][y][x]
|
|
end
|
|
print(line)
|
|
end
|
|
print("")
|
|
end
|
|
end
|
|
|
|
-- Initialise the world
|
|
start_time = os.clock()
|
|
|
|
function generate_maze3d(seed, width, height, depth)
|
|
start_time = os.clock()
|
|
|
|
print("Generating maze "..width.."x"..height.."x"..depth)
|
|
math.randomseed(seed) -- seed the random number generator with the system clock
|
|
|
|
width = width - 1
|
|
height = height - 1
|
|
|
|
local world = {}
|
|
for z = 0, depth, 1 do
|
|
world[z] = {}
|
|
for y = 0, height, 1 do
|
|
world[z][y] = {}
|
|
for x = 0, width, 1 do
|
|
world[z][y][x] = "#"
|
|
end
|
|
end
|
|
end
|
|
|
|
-- do a random walk to create pathways
|
|
local nodes = {} -- the nodes left that we haven't investigated
|
|
local curnode = 1 -- the node we are currently operating on
|
|
local cx, cy, cz = 1, 1, 1 -- our current position
|
|
table.insert(nodes, { x = cx, y = cy, z = cz })
|
|
world[cz][cy][cx] = " "
|
|
while #nodes > 0 do
|
|
-- io.write("Nodes left: " .. curnode .. "\r")
|
|
--print("Nodes left: " .. #nodes)
|
|
|
|
local directions = "" -- the different directions we can move in
|
|
if cz - 2 > 0 and world[cz - 2][cy][cx] == "#" then
|
|
directions = directions .. "-"
|
|
end
|
|
if cz + 2 < depth and world[cz + 2][cy][cx] == "#" then
|
|
directions = directions .. "+"
|
|
end
|
|
if cy - 2 > 0 and world[cz][cy - 2][cx] == "#" then
|
|
directions = directions .. "u"
|
|
end
|
|
if cy + 2 < height and world[cz][cy + 2][cx] == "#" then
|
|
directions = directions .. "d"
|
|
end
|
|
if cx - 2 > 0 and world[cz][cy][cx - 2] == "#" then
|
|
directions = directions .. "l"
|
|
end
|
|
if cx + 2 < width and world[cz][cy][cx + 2] == "#" then
|
|
directions = directions .. "r"
|
|
end
|
|
|
|
-- If this is 1 or less, then we will switch our attention to another candidate node after moving
|
|
local shift_attention = math.random(0, 3)
|
|
|
|
--print("radar output: '" .. directions .. "' (length: " .. #directions .. "), curnode: " .. curnode)
|
|
if #directions > 0 then
|
|
-- we still have somewhere that we can go
|
|
local curdirnum = math.random(1, #directions)
|
|
local curdir = string.sub(directions, curdirnum, curdirnum)
|
|
|
|
if curdir == "+" then
|
|
world[cz + 1][cy][cx] = " "
|
|
world[cz + 2][cy][cx] = " "
|
|
cz = cz + 2
|
|
elseif curdir == "-" then
|
|
world[cz - 1][cy][cx] = " "
|
|
world[cz - 2][cy][cx] = " "
|
|
cz = cz - 2
|
|
elseif curdir == "u" then
|
|
world[cz][cy - 1][cx] = " "
|
|
world[cz][cy - 2][cx] = " "
|
|
cy = cy - 2
|
|
elseif curdir == "d" then
|
|
world[cz][cy + 1][cx] = " "
|
|
world[cz][cy + 2][cx] = " "
|
|
cy = cy + 2
|
|
elseif curdir == "l" then
|
|
world[cz][cy][cx - 1] = " "
|
|
world[cz][cy][cx - 2] = " "
|
|
cx = cx - 2
|
|
elseif curdir == "r" then
|
|
world[cz][cy][cx + 1] = " "
|
|
world[cz][cy][cx + 2] = " "
|
|
cx = cx + 2
|
|
end
|
|
|
|
table.insert(nodes, { x = cx, y = cy, z = cz })
|
|
else
|
|
table.remove(nodes, curnode)
|
|
end
|
|
|
|
if #directions == 0 or shift_attention <= 1 then
|
|
if #nodes > 0 then
|
|
curnode = math.random(1, #nodes)
|
|
|
|
cx = nodes[curnode]["x"]
|
|
cy = nodes[curnode]["y"]
|
|
cz = nodes[curnode]["z"]
|
|
end
|
|
end
|
|
end
|
|
|
|
end_time = os.clock()
|
|
|
|
return world
|
|
end
|
|
|
|
-- local world = maze(os.time(), width, height)
|
|
|
|
function worldedit.maze3d(pos1, pos2, target_node, seed)
|
|
pos1, pos2 = worldedit.sort_pos(pos1, pos2)
|
|
-- pos2 will always have the highest co-ordinates now
|
|
|
|
-- getExtent() returns the number of nodes in the VoxelArea, which might be larger than we actually asked for
|
|
local extent = {
|
|
x = (pos2.x - pos1.x) + 1,
|
|
y = (pos2.y - pos1.y) + 1,
|
|
z = (pos2.z - pos1.z) + 1
|
|
}
|
|
-- minetest.log("action", "extent: ("..extent.x..", "..extent.y..", "..extent.z..")")
|
|
|
|
if extent.x < 3 or extent.y < 3 or extent.z < 3 then
|
|
minetest.log("info", "[worldeditadditions/maze] error: either x, y, or z of the extent were less than 3")
|
|
return 0
|
|
end
|
|
|
|
-- Fetch the nodes in the specified area
|
|
local manip, area = worldedit.manip_helpers.init(pos1, pos2)
|
|
local data = manip:get_data()
|
|
|
|
local node_id_air = minetest.get_content_id("air")
|
|
local node_id_target = minetest.get_content_id(target_node)
|
|
|
|
-- minetest.log("action", "pos1: " .. worldeditadditions.vector.tostring(pos1))
|
|
-- minetest.log("action", "pos2: " .. worldeditadditions.vector.tostring(pos2))
|
|
|
|
|
|
minetest.log("action", "Generating "..extent.x.."x"..extent.z.."x"..extent.z.." 3d maze from pos1 " .. worldeditadditions.vector.tostring(pos1).." to pos2 "..worldeditadditions.vector.tostring(pos2))
|
|
|
|
local maze = generate_maze3d(seed, extent.z, extent.y, extent.x) -- x & need to be the opposite way around to how we index it
|
|
-- printspace3d(maze, extent.z, extent.y, extent.x)
|
|
|
|
-- z y x is the preferred loop order, but that isn't really possible here
|
|
|
|
for z = pos2.z, pos1.z, - 1 do
|
|
for x = pos2.x, pos1.x, - 1 do
|
|
for y = pos2.y, pos1.y, - 1 do
|
|
local maze_x = (x - pos1.x) -- - 1
|
|
local maze_y = (y - pos1.y) -- - 1
|
|
local maze_z = (z - pos1.z) -- - 1
|
|
if maze_x < 0 then maze_x = 0 end
|
|
if maze_y < 0 then maze_y = 0 end
|
|
if maze_z < 0 then maze_z = 0 end
|
|
|
|
-- minetest.log("action", "x: "..x..", y: "..y..", z: "..z..", pos x: "..maze_x..", pos z: "..maze_z)
|
|
-- minetest.log("action", "value: "..maze[maze_x][maze_y][maze_z])
|
|
|
|
if maze[maze_x][maze_y][maze_z] == "#" then
|
|
data[area:index(x, y, z)] = node_id_target
|
|
else
|
|
data[area:index(x, y, z)] = node_id_air
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
-- Save the modified nodes back to disk & return
|
|
worldedit.manip_helpers.finish(manip, data)
|
|
|
|
return extent.x * extent.y * extent.z
|
|
end
|