diff options
| author | Brett O'Donnell <cornernote@gmail.com> | 2012-09-26 18:36:11 -0400 |
|---|---|---|
| committer | Anthony Zhang <azhang9@gmail.com> | 2012-09-26 18:36:11 -0400 |
| commit | a82ab9176f831b4f1beb9d2f3c3a7d582abf8b44 (patch) | |
| tree | 94cccae40f75d943e73a672c28e9a75a3dff115a /functions.lua | |
| parent | 382c57d008dfa8e1c26263d572d606e5d0f7f2ce (diff) | |
Fix worldedit.spiral and the correspondign chat command, //spiral.
Diffstat (limited to 'functions.lua')
| -rw-r--r-- | functions.lua | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/functions.lua b/functions.lua index 9f75468..2d949c6 100644 --- a/functions.lua +++ b/functions.lua @@ -267,6 +267,72 @@ worldedit.pyramid = function(pos, height, nodename) return count
end
+--adds a spiral at `pos` with width `width`, height `height`, space between walls `spacer`, composed of `nodename`, returning the number of nodes added
+worldedit.spiral = function(pos, width, height, spacer, nodename) --wip: clean this up
+ -- spiral matrix - http://rosettacode.org/wiki/Spiral_matrix#Lua
+ av, sn = math.abs, function(s) return s~=0 and s/av(s) or 0 end
+ local function sindex(z, x) -- returns the value at (x, z) in a spiral that starts at 1 and goes outwards
+ if z == -x and z >= x then return (2*z+1)^2 end
+ local l = math.max(av(z), av(x))
+ return (2*l-1)^2+4*l+2*l*sn(x+z)+sn(z^2-x^2)*(l-(av(z)==l and sn(z)*x or sn(x)*z)) -- OH GOD WHAT
+ end
+ local function spiralt(side)
+ local ret, id, start, stop = {}, 0, math.floor((-side+1)/2), math.floor((side-1)/2)
+ for i = 1, side do
+ for j = 1, side do
+ local id = side^2 - sindex(stop - i + 1,start + j - 1)
+ ret[id] = {x=i,z=j}
+ end
+ end
+ return ret
+ end
+ -- connect the joined parts
+ local spiral = spiralt(width)
+ height = tonumber(height)
+ if height < 1 then height = 1 end
+ spacer = tonumber(spacer)-1
+ if spacer < 1 then spacer = 1 end
+ local count = 0
+ local node = {name=nodename}
+ local np,lp
+ for y=0,height do
+ lp = nil
+ for _,v in ipairs(spiral) do
+ np = {x=pos.x+v.x*spacer, y=pos.y+y, z=pos.z+v.z*spacer}
+ if lp~=nil then
+ if lp.x~=np.x then
+ if lp.x<np.x then
+ for i=lp.x+1,np.x do
+ minetest.env:add_node({x=i, y=np.y, z=np.z}, node)
+ count = count + 1
+ end
+ else
+ for i=np.x,lp.x-1 do
+ minetest.env:add_node({x=i, y=np.y, z=np.z}, node)
+ count = count + 1
+ end
+ end
+ end
+ if lp.z~=np.z then
+ if lp.z<np.z then
+ for i=lp.z+1,np.z do
+ minetest.env:add_node({x=np.x, y=np.y, z=i}, node)
+ count = count + 1
+ end
+ else
+ for i=np.z,lp.z-1 do
+ minetest.env:add_node({x=np.x, y=np.y, z=i}, node)
+ count = count + 1
+ end
+ end
+ end
+ end
+ lp = np
+ end
+ end
+ return count
+end
+
--copies the region defined by positions `pos1` and `pos2` along the `axis` axis ("x" or "y" or "z") by `amount` nodes, returning the number of nodes copied
worldedit.copy = function(pos1, pos2, axis, amount)
local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
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