class Numeric
Public Instance Methods
from_scale(range)
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convert value from old scale (min to max) to (0..1) scale
# File lib/artoo/ext/numeric.rb, line 31 def from_scale(range) (self.to_f - range.min) / (range.max - range.min) end
to_scale(range)
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convert value from (0..1) scale to new (min to max) scale
# File lib/artoo/ext/numeric.rb, line 36 def to_scale(range) ((self.to_f * (range.max - range.min) + range.min).ceil).within(range) end
within(range)
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keep returned value absolutely within range
# File lib/artoo/ext/numeric.rb, line 41 def within(range) case when self < range.min range.min when self > range.max range.max else self end end