78 lines
2.7 KiB
Lua
78 lines
2.7 KiB
Lua
--[[
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Copyright (c) 2014, Robert 'Bobby' Zenz
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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--]]
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--- Various mathematical functions.
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mathutil = {}
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--- Clamps one value to the given minimum/maximum values. Defaults to
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-- 0 to 1 if min/max are omitted.
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--
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-- @param value The value to clamp.
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-- @param min Optional. The minimum value, defaults to 0.
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-- @param max Optional. The masximum value, defaults to 1.
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-- @return The value clamped to the given range.
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function mathutil.clamp(value, min, max)
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if min == nil or max == nil then
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return math.min(math.max(value, -1), 1)
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else
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return math.min(math.max(value, min), max)
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end
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end
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--- Gets the next lower prime from the given number.
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--
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-- @param number The number.
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-- @return The next lower prime.
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function mathutil.next_lower_prime(number)
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for lower = number, 0, -1 do
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if (lower <= 2 or math.fmod(lower, 2) ~= 0)
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and (lower <= 3 or math.fmod(lower, 3) ~= 0)
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and (lower <= 5 or math.fmod(lower, 5) ~= 0)
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and (lower <= 7 or math.fmod(lower, 7) ~= 0) then
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return lower
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end
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end
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return 0
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end
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--- Rounds to the nearest number with the given decimal places.
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--
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-- @param value The value to round.
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-- @param decimal_places Optional. The number of decimal places to round to,
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-- defaults to 0.
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-- @return The rounded value.
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function mathutil.round(value, decimal_places)
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decimal_places = decimal_places or 0
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local multiplicator = 10 ^ decimal_places
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return math.floor(value * multiplicator + 0.5) / multiplicator
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end
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