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Add VoxelArea:position, VoxelArea:iter and VoxelArea:iterp

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This commit is contained in:
Kahrl 2013-07-09 16:26:52 +02:00
parent 52beafff53
commit 6027c8d259
2 changed files with 48 additions and 0 deletions
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41
builtin/voxelarea.lua
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@ -44,6 +44,22 @@ function VoxelArea:indexp(p)
return math.floor(i)
end
function VoxelArea:position(i)
local p = {}
i = i - 1
p.z = math.floor(i / self.zstride) + self.MinEdge.z
i = i % self.zstride
p.y = math.floor(i / self.ystride) + self.MinEdge.y
i = i % self.ystride
p.x = math.floor(i) + self.MinEdge.x
return p
end
function VoxelArea:contains(x, y, z)
return (x >= self.MinEdge.x) and (x <= self.MaxEdge.x) and
(y >= self.MinEdge.y) and (y <= self.MaxEdge.y) and
@ -60,3 +76,28 @@ function VoxelArea:containsi(i)
return (i >= 1) and (i <= self:getVolume())
end
function VoxelArea:iter(minx, miny, minz, maxx, maxy, maxz)
local i = self:index(minx, miny, minz) - 1
local last = self:index(maxx, maxy, maxz)
local ystride = self.ystride
local zstride = self.zstride
local yoff = (last+1) % ystride
local zoff = (last+1) % zstride
local ystridediff = (i - last) % ystride
local zstridediff = (i - last) % zstride
return function()
i = i + 1
if i % zstride == zoff then
i = i + zstridediff
elseif i % ystride == yoff then
i = i + ystridediff
end
if i <= last then
return i
end
end
end
function VoxelArea:iterp(minp, maxp)
return self:iter(minp.x, minp.y, minp.z, maxp.x, maxp.y, maxp.z)
end