31 lines
711 B
Plaintext
31 lines
711 B
Plaintext
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import bytes from require "resty.random"
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import byte from string
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import floor from math
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-- return a random number between min/max
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random = (min, max) ->
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unless max
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max = min or 1
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min = 0
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a, b = byte bytes(2), 1, 2
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c, d = byte bytes(2), 1, 2
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value = a + b * 256 + c * 65536 + d * 16777216 -- 0 to 4294967296
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range = max - min
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if max == floor(max) and min == floor(min)
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return floor value * range / 4294967296 + min
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else
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return value * range / 4294967296 + min
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-- map a value within a range of numbers to another range
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map = (min1, max1, value, min2, max2) ->
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range1 = max1 - min1
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range2 = max2 - min2
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return ((value - min1) * range2 / range1) + min2
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{
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:random
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:map
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}
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