39 lines
1.1 KiB
Lua
39 lines
1.1 KiB
Lua
local mod_player_monoids = minetest.get_modpath("player_monoids") ~= nil
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local mod_playerphysics = minetest.get_modpath("playerphysics") ~= nil
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local mod_pova = minetest.get_modpath("pova") ~= nil
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local utility = {}
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function utility.rangelim(value, min, max)
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return math.min(math.max(value, min), max)
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end
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-- from https://stackoverflow.com/a/29133654
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-- merges two tables together
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-- if in conflict, b will override values of a
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function utility.merge_tables(a, b)
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if type(a) == "table" and type(b) == "table" then
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for k,v in pairs(b) do
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if type(v)=="table" and type(a[k] or false)=="table" then
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utility.merge_tables(a[k],v)
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else a[k]=v end
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end
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end
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return a
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end
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-- see https://en.wikipedia.org/wiki/Logistic_function
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function utility.sigmoid(value, max, growth, midpoint)
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return max / (1 + math.exp(-growth * (value - midpoint)))
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end
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-- generates a wave of cycle length 1
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-- maps parameters to values between 0 and 1
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-- 0 is mapped to 0 and 0.5 to 1
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function utility.normalized_cycle(value)
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return math.cos((2 * value + 1) * math.pi) / 2 + 0.5
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end
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return utility
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