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Contents
#
# The ratio between two numbers (eg: 2:1, 3:4)
#
# Can be compared, added, "percent"ed, "to_f"ed, and displayed.
#
class Ratio
include Comparable
def <=>(other)
to_f <=> other.to_f
end
attr_accessor :first, :last
def self.[](*args)
new(*args)
end
#
# `first` is the top part of the ratio, `last` is the bottom (eg: `first/last`)
#
def initialize(first, last=1)
@first = first
@last = last
end
#
# Returns a string representation: "a/b"
#
def to_s
"#{@first}/#{@last}"
end
alias_method :ratio, :to_s
#
# Returns the ratio as a float. (eg: Ratio[1,2].to_f == 0.5)
#
def to_f
if @last == 0
0.0
else
@first.to_f / @last
end
end
#
# Returns a string representing the number in percent
#
def percent
"%0.1f%%" % (to_f * 100)
end
alias_method :to_percent, :percent
#
# "#<Ratio: 1/2>"
#
def inspect
"#<Ratio: #{to_s}>"
end
#
# Adds together the tops and bottoms of the ratios.
#
# Example: For the ratios `a/c` and `b/d`, returns `a+b/c+d`
#
def +(other)
Ratio.new( first+other.first, last+other.last)
end
end
#
# Function-style wrapper
#
def Ratio(*args)
Ratio.new(*args)
end
Version data entries
22 entries across 22 versions & 1 rubygems