Module: Tillless::Location

Defined in:
lib/tillless-core/location.rb

Defined Under Namespace

Modules: ClassMethods, InstanceMethods, RailsInstanceMethods, RubyInstanceMethods Classes: LocationCalibrationException

Constant Summary collapse

RADIUS_OF_EARTH =

Radius of the Earth in km

Float(6378.7)
MIN_DISTANCE_FOR_NEARBY_IN_KM =

Minimum distance apart to be considered ‘near’ in km

0.2
MIN_DISTANCE_FOR_NEARBY_IN_M = 
MIN_DISTANCE_FOR_NEARBY_IN_KM * 1000.0
PI_RADIANCE =

Shorthand for Pi Radians

(Math::PI / 180)
GREAT_CIRCLE_FACTOR =

Factor used in great circle calcs

57.2958

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/tillless-core/location.rb', line 22

def self.included(base)
  base.send :include, InstanceMethods
  base.send :extend, ClassMethods

  # Set the right attr method if a rails environment (assuming it's an ActiveRecord model)
  if defined?(Rails.env)
    base.send :attr_accessible, :lat, :lon
    base.send :validates_presence_of, :lat, :lon
    # Always recalibrate on save
    base.send :before_save, :calibrate
    base.send :include, RailsInstanceMethods
  else
    base.send :include, RubyInstanceMethods

    attr_accessor :lat, :lon

    # true if calibrated, note: following lat= or lon= it will need to be re-calibrated
    attr_accessor :calibrated

    # These are used so that half of the Great Circle algorithm can be calculated on
    # instantiation which makes any subsequent comparison check significantly faster.
    # See calibrate() for more details.
    attr_accessor :term1, :term2, :term3, :term4, :term5, :term6
  end
end