73 lines
1.7 KiB
Lua
73 lines
1.7 KiB
Lua
-- A simple special-purpose class, this is used for building up sets of three-dimensional points
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-- I only added features to it as I needed them so may not be highly useful outside of this mod's context.
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Pointset = {}
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Pointset.__index = Pointset
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function Pointset.create()
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local set = {}
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setmetatable(set,Pointset)
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set.points = {}
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return set
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end
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function Pointset:set(x, y, z, value)
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-- sets a value in the 3D array "points".
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if self.points[x] == nil then
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self.points[x] = {}
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end
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if self.points[x][y] == nil then
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self.points[x][y] = {}
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end
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self.points[x][y][z] = value
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end
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function Pointset:set_if_not_in(excluded, x, y, z, value)
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-- If a value is not already set for this point in the 3D array "excluded", set it in "points"
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if excluded:get(x, y, z) ~= nil then
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return
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end
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self:set(x, y, z, value)
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end
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function Pointset:get(x, y, z)
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-- return a value from the 3D array "points"
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if self.points[x] == nil or self.points[x][y] == nil then
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return nil
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end
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return self.points[x][y][z]
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end
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function Pointset:pop()
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-- returns a point that's in the 3D array, and then removes it.
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local pos = {}
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local ytable
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local ztable
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local val
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local count = 0
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for _ in pairs(self.points) do count = count + 1 end
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if count == 0 then
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return nil
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end
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pos.x, ytable = next(self.points)
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pos.y, ztable = next(ytable)
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pos.z, val = next(ztable)
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self.points[pos.x][pos.y][pos.z] = nil
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count = 0
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for _ in pairs(self.points[pos.x][pos.y]) do count = count + 1 end
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if count == 0 then
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self.points[pos.x][pos.y] = nil
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end
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count = 0
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for _ in pairs(self.points[pos.x]) do count = count + 1 end
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if count == 0 then
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self.points[pos.x] = nil
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end
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return pos, val
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end |