Minetest-WorldEditAdditions/worldeditadditions/utils/numbers.lua

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-- From http://lua-users.org/wiki/SimpleRound
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function worldeditadditions.round(num, numDecimalPlaces)
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local mult = 10^(numDecimalPlaces or 0)
return math.floor(num * mult + 0.5) / mult
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end
function worldeditadditions.hypotenuse(x1, y1, x2, y2)
local xSquare = math.pow(x1 - x2, 2);
local ySquare = math.pow(y1 - y2, 2);
return math.sqrt(xSquare + ySquare);
end
function worldeditadditions.sum(list)
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if #list == 0 then return 0 end
local sum = 0
for i,value in ipairs(list) do
sum = sum + value
end
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return sum
end
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--- Calculates the mean of all the numbers in the given list.
-- @param list number[] The list (table) of numbers to calculate the mean for.
-- @returns The mean of the numbers in the given table.
function worldeditadditions.average(list)
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if #list == 0 then return 0 end
return worldeditadditions.sum(list) / #list
end
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--- Finds the minimum value in the given list.
-- @param list number[] The list (table) of numbers to find the minimum value of.
-- @returns number The minimum value in the given list.
function worldeditadditions.min(list)
if #list == 0 then return nil end
local min = nil
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for i,value in pairs(list) do
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if min == nil or min > value then
min = value
end
end
return min
end
--- Finds the maximum value in the given list.
-- @param list number[] The list (table) of numbers to find the maximum value of.
-- @returns number The maximum value in the given list.
function worldeditadditions.max(list)
if #list == 0 then return nil end
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-- We use pairs() instead of ipairs() here, because then we can support
-- zero-indexed 1D heightmaps too - and we don't care that the order is
-- undefined with pairs().
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local max = nil
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for i,value in pairs(list) do
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if max == nil or max < value then
max = value
end
end
return max
end
--- Returns the minetest.get_us_time() in ms
-- @return float
function worldeditadditions.get_ms_time()
return minetest.get_us_time() / 1000
end
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--- Calculates the estimated time remaining from a list of times.
-- Intended to be used where one has a number of works units, and one has a
-- list of how long the most recent units have taken to run.
-- @param existing_times number[] A list of times - in ms - that the most recent work units have taken.
-- @param done_count number The number of work units completed so far.
-- @param total_count number The total number of work units to be completed.
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function worldeditadditions.eta(existing_times, done_count, total_count)
local max = 100
local average = worldeditadditions.average(
worldeditadditions.table.get_last(existing_times, max)
)
local times_left = total_count - done_count
if times_left == 0 then return 0 end
return average * times_left
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end
--- Returns the sign (+ or -) at the beginning of a string if present.
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-- @param src string|int Input string.
-- @return string|int Returns the signed multiplier (1|-1).
function worldeditadditions.getsign(src)
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if type(src) == "number" then
if src < 0 then return -1 else return 1 end
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elseif type(src) ~= "string" then return 1
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else
if src:match('-') then return -1 else return 1 end
end
end
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--- Clamp a number to ensure it falls within a given range.
-- @param value number The value to clamp.
-- @param min number The minimum allowed value.
-- @param max number The maximum allowed value.
-- @returns number The clamped number.
function worldeditadditions.clamp(value, min, max)
if value < min then return min end
if value > max then return max end
return value
end
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-- For Testing:
-- worldeditadditions = {}
-- print(worldeditadditions.getsign('-y'))