Class: GeoRb::Distance

Inherits:
Object
  • Object
show all
Defined in:
lib/geo_rb/distance.rb

Constant Summary collapse

EARTH_RADIUS = 
6_371.0088

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*locations) ⇒ Distance

Returns a new instance of Distance.



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# File 'lib/geo_rb/distance.rb', line 25

def initialize(*locations)
  GeoRb.logger.debug locations
  @meters = case locations.size
  when 0..1
    0
  else
    locations.each_cons(2).reduce(0) do |distance, pair|
      a, b = sanitize_location(pair.first), sanitize_location(pair.last)
      distance + measure(a, b)
    end
  end
  @kilometers = @meters.to_d / 1_000
end

Instance Attribute Details

#kilometers ⇒ Object (readonly) Also known as: km

Returns the value of attribute kilometers.



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# File 'lib/geo_rb/distance.rb', line 10

def kilometers
  @kilometers
end

#meters ⇒ Object (readonly) Also known as: m

Returns the value of attribute meters.



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# File 'lib/geo_rb/distance.rb', line 10

def meters
  @meters
end

Class Method Details

.between(*addresses, adapter: GeoRb::GeoCoders::Nominatim) ⇒ Object 



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# File 'lib/geo_rb/distance.rb', line 14

def self.between(*addresses, adapter: GeoRb::GeoCoders::Nominatim)
  return new if addresses.size == 1

  requests = addresses.map do |address|
    Concurrent::Promises.future(address) { |a| adapter.new.geocode(a) }
  end

  locations = Concurrent::Promises.zip(*requests).value!
  new(*locations)
end

Instance Method Details

#ensure_same_altitude(a, b) ⇒ Object

Raises:



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# File 'lib/geo_rb/distance.rb', line 39

def ensure_same_altitude(a, b)
  raise LatitudeMismatch if (a.altitude - b.altitude).abs > 1e-6
end

#measure(a, b) ⇒ Object 



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# File 'lib/geo_rb/distance.rb', line 43

def measure(a, b)
  ensure_same_altitude(a, b)
  r = Wgs84.new.distance(a.latitude, a.longitude, b.latitude, b.longitude).first
  r.to_d
end