class Arel::Nodes::Haversine

Public Class Methods

new(lat1, lng1, lat2, lng2, options = nil) click to toggle source
Calls superclass method
# File lib/arel/nodes/haversine.rb, line 6
def initialize lat1, lng1, lat2, lng2, options = nil
  super Multiplication.new(
    Arcsine.new(
      SquareRoot.new(
        Addition.new(
          Pow.new(Sine.new(Division.new(Radians.new(lat1 - lat2), 2)), 2),
          Multiplication.new(
            Pow.new(Sine.new(Division.new(Radians.new(lng1 - lng2), 2)), 2),
            Multiplication.new(
              Cosine.new(Radians.new(lat2)),
              Cosine.new(Radians.new(lat1))
            )
          )
        )
      )
    ), diameter(options)
  )
end

Private Instance Methods

diameter(options) click to toggle source
# File lib/arel/nodes/haversine.rb, line 27
def diameter options
  (options || {})[:unit] == :mi ? 7917.5 : 12742
end