module PhotoCook::DevicePixelRatio
Constants
- DEFAULT
- MAX
Public Class Methods
check!(x)
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# File lib/photo-cook/device-pixel-ratio.rb, line 19 def check!(x) x = typecast(x) raise Invalid, x if !x.kind_of?(Integer) && (x.nan? || x.infinite?) raise OutOfBounds, x if x < DEFAULT || x > MAX true end
parse(x)
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# File lib/photo-cook/device-pixel-ratio.rb, line 10 def parse(x) typecast(x) end
parse!(x)
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# File lib/photo-cook/device-pixel-ratio.rb, line 14 def parse!(x) check!(x = parse(x)) x end
typecast(x)
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# File lib/photo-cook/device-pixel-ratio.rb, line 41 def typecast(x) x.kind_of?(Numeric) ? x : x.to_f end
unify(x)
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Do not produce various number of pixel ratios:
1.0 => 1 2.5 => 3 2.1 => 3 3.1 => 4
# File lib/photo-cook/device-pixel-ratio.rb, line 31 def unify(x) typecast(x).ceil end
valid?(x)
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# File lib/photo-cook/device-pixel-ratio.rb, line 35 def valid?(x) check!(x) rescue Invalid, OutOfBounds false end