Class: Arel::Nodes::Haversine

Inherits:
Function
  • Object
show all
Defined in:
lib/arel/nodes/haversine.rb

Instance Method Summary collapse

Constructor Details

#initialize(lat1, lng1, lat2, lng2, options = nil) ⇒ Haversine

Returns a new instance of Haversine.



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# 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