Contents

module Haversine
  class Distance
    include Comparable
    
    GREAT_CIRCLE_RADIUS_MILES = 3956
    GREAT_CIRCLE_RADIUS_KILOMETERS = 6371 # some algorithms use 6367
    GREAT_CIRCLE_RADIUS_FEET = GREAT_CIRCLE_RADIUS_MILES * 5280
    GREAT_CIRCLE_RADIUS_METERS = GREAT_CIRCLE_RADIUS_KILOMETERS * 1000

    attr_reader :great_circle_distance

    def initialize(great_circle_distance)
      @great_circle_distance = great_circle_distance
    end
  
    def to_miles
      @great_circle_distance * GREAT_CIRCLE_RADIUS_MILES
    end
    alias_method :to_mi, :to_miles
  
    def to_kilometers
      @great_circle_distance * GREAT_CIRCLE_RADIUS_KILOMETERS
    end
    alias_method :to_km, :to_kilometers
  
    def to_meters
      @great_circle_distance * GREAT_CIRCLE_RADIUS_METERS
    end
    alias_method :to_m, :to_meters
  
    def to_feet
      @great_circle_distance * GREAT_CIRCLE_RADIUS_FEET
    end
    alias_method :to_ft, :to_feet
    
    def <=>(other)
      great_circle_distance <=> other.great_circle_distance
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
haversine-0.3.0	lib/haversine/distance.rb