Module: UnitConversions

Defined in:
lib/unit_conversions.rb

Overview

Pure-function helpers for converting between inches and feet/inches
notation (72 → 6′) and approximating decimal numbers as Rationals
with a bounded denominator. Used by the design-tool / room-layout
views where measurements need both decimal and "feet-inches" formats.

Class Method Summary collapse

Class Method Details

.closest_rational(number, max_denominator = 1000) ⇒ Rational?

Returns the closest rational approximation.

Returns:

  • (Rational, nil) —

    the closest rational approximation



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# File 'lib/unit_conversions.rb', line 27

def self.closest_rational(number, max_denominator = 1000)
  return if number.blank?

  # Convert the number to a rational approximation with a limited denominator
  Rational(number).rationalize(Rational(1, max_denominator))
end

.inches_to_feetinches(inches, separator: ' ') ⇒ String?

Returns the inches formatted as feet and inches.

Returns:

  • (String, nil) —

    the inches formatted as feet and inches



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# File 'lib/unit_conversions.rb', line 8

def self.inches_to_feetinches(inches, separator: ' ')
  return nil if inches.nil?

  inches = inches.to_f
  s = []
  ft = (inches / 12).truncate
  inches = (inches % 12)
  if ft.positive?
    ft = ActionController::Base.helpers.number_with_precision ft, precision: 0, strip_insignificant_zeros: true
    s << "#{ft}′"
  end
  if inches.positive?
    inches = ActionController::Base.helpers.number_with_precision inches, precision: 3, strip_insignificant_zeros: true
    s << "#{inches}″"
  end
  s.join(separator)
end