mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-11-16 13:03:00 +00:00
109 lines
3.5 KiB
Lua
109 lines
3.5 KiB
Lua
-- 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)
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return math.floor(num * mult + 0.5) / mult
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end
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function worldeditadditions.hypotenuse(x1, y1, x2, y2)
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local xSquare = (x1 - x2) ^ 2;
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local ySquare = (y1 - y2) ^ 2;
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return math.sqrt(xSquare + ySquare);
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end
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function worldeditadditions.sum(list)
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if #list == 0 then return 0 end
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local sum = 0
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for i,value in ipairs(list) do
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sum = sum + value
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end
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return sum
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end
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--- Calculates the mean of all the numbers in the given list.
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-- @param list number[] The list (table) of numbers to calculate the mean for.
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-- @returns The mean of the numbers in the given table.
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function worldeditadditions.average(list)
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if #list == 0 then return 0 end
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return worldeditadditions.sum(list) / #list
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end
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--- Finds the minimum value in the given list.
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-- @param list number[] The list (table) of numbers to find the minimum value of.
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-- @returns number The minimum value in the given list.
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function worldeditadditions.min(list)
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if #list == 0 then return nil end
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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
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min = value
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end
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end
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return min
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end
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--- Finds the maximum value in the given list.
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-- @param list number[] The list (table) of numbers to find the maximum value of.
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-- @returns number The maximum value in the given list.
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function worldeditadditions.max(list)
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if #list == 0 then return nil end
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-- We use pairs() instead of ipairs() here, because then we can support
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-- zero-indexed 1D heightmaps too - and we don't care that the order is
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-- 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
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max = value
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end
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end
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return max
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end
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--- Returns the minetest.get_us_time() in ms
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-- @return float
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function worldeditadditions.get_ms_time()
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return minetest.get_us_time() / 1000
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end
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--- Calculates the estimated time remaining from a list of times.
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-- Intended to be used where one has a number of works units, and one has a
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-- list of how long the most recent units have taken to run.
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-- @param existing_times number[] A list of times - in ms - that the most recent work units have taken.
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-- @param done_count number The number of work units completed so far.
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-- @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)
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local max = 100
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local average = worldeditadditions.average(
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worldeditadditions.table.get_last(existing_times, max)
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)
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local times_left = total_count - done_count
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if times_left == 0 then return 0 end
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return average * times_left
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end
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--- Returns the sign (+ or -) at the beginning of a string if present.
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-- @param src string|int Input string.
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-- @return string|int Returns the signed multiplier (1|-1).
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function worldeditadditions.getsign(src)
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if type(src) == "number" then
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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
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if src:match('-') then return -1 else return 1 end
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end
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end
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--- Clamp a number to ensure it falls within a given range.
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-- @param value number The value to clamp.
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-- @param min number The minimum allowed value.
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-- @param max number The maximum allowed value.
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-- @returns number The clamped number.
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function worldeditadditions.clamp(value, min, max)
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if value < min then return min end
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if value > max then return max end
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return value
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end
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-- For Testing:
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-- worldeditadditions = {}
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-- print(worldeditadditions.getsign('-y'))
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