Class: Fitment::Wheel

Inherits:
Object
  • Object
show all
Defined in:
lib/fitment/wheel.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(diameter_in, width_in, et: 0, offset: nil) ⇒ Wheel

Returns a new instance of Wheel.



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# File 'lib/fitment/wheel.rb', line 15

def initialize(diameter_in, width_in, et: 0, offset: nil)
  @diameter = Rational(diameter_in)
  @width = Rational(width_in)
  if offset
    @et = nil
    @offset = Rational(offset)
  else
    @offset = nil
    @et = et.to_i
  end
end

Instance Attribute Details

#diameter ⇒ Object (readonly)

Returns the value of attribute diameter.



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# File 'lib/fitment/wheel.rb', line 13

def diameter
  @diameter
end

#et ⇒ Object (readonly)

Returns the value of attribute et.



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# File 'lib/fitment/wheel.rb', line 13

def et
  @et
end

#offset ⇒ Object (readonly)

Returns the value of attribute offset.



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# File 'lib/fitment/wheel.rb', line 13

def offset
  @offset
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/fitment/wheel.rb', line 13

def width
  @width
end

Class Method Details

.et(offset_in, width_in) ⇒ Object 



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# File 'lib/fitment/wheel.rb', line 5

def self.et(offset_in, width_in)
  (-1 * Fitment.mm(offset_in - width_in / 2)).round
end

.offset(et_mm, width_in) ⇒ Object 



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# File 'lib/fitment/wheel.rb', line 9

def self.offset(et_mm, width_in)
  (width_in / 2 - Fitment.inches(et_mm)).round(2)
end

Instance Method Details

#et! ⇒ Object 



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# File 'lib/fitment/wheel.rb', line 27

def et!
  @et or self.class.et(@offset, @width)
end

#offset! ⇒ Object 



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# File 'lib/fitment/wheel.rb', line 31

def offset!
  @offset or self.class.offset(@et, @width)
end

#to_s ⇒ Object 



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# File 'lib/fitment/wheel.rb', line 35

def to_s
  ary = ["%gx%g" % [@diameter, @width]]
  if @offset
    ary << "offset:%g" % @offset
  else
    ary << "et:%i" % @et
  end
  ary.join(' ')
end