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77 lines
2.0 KiB
Lua
77 lines
2.0 KiB
Lua
-- A simple special-purpose class, this is used for building up sets of three-dimensional points for fast reference
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Pointset = {}
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Pointset.__index = Pointset
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-- from builtin\game\misc.lua, modified to take values directly to avoid creating an intermediate vector
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local hash_node_position_values = function(x, y, z)
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return (z + 32768) * 65536 * 65536
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+ (y + 32768) * 65536
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+ x + 32768
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end
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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:clear()
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local points = self.points
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for k, v in pairs(points) do
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points[k] = nil
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end
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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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self.points[hash_node_position_values(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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return self.points[hash_node_position_values(x,y,z)]
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end
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function Pointset:set_pos(pos, value)
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self:set(pos.x, pos.y, pos.z, value)
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end
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function Pointset:set_pos_if_not_in(excluded, pos, value)
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self:set_if_not_in(excluded, pos.x, pos.y, pos.z, value)
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end
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function Pointset:get_pos(pos)
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return self:get(pos.x, pos.y, pos.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 hash, value = next(self.points)
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if hash == nil then return nil end
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local pos = minetest.get_position_from_hash(hash)
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self.points[hash] = nil
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return pos, value
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end
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function Pointset:get_pos_list(value)
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-- Returns a list of all points with the given value in standard Minetest vector format. If no value is provided, returns all points
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local outlist = {}
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for hash, pointsval in pairs(self.points) do
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if value == nil or pointsval == value then
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table.insert(outlist, minetest.get_position_from_hash(hash))
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end
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end
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return outlist
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end
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