Class: Mongoid::Geo::Unit

Inherits:
Object
  • Object
show all
Defined in:
lib/mongoid/geo/unit.rb

Class Method Summary collapse

Class Method Details

.distMultiplier(unit = :km) ⇒ Object 



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# File 'lib/mongoid/geo/unit.rb', line 13

def distMultiplier unit = :km
  unit_key = key(unit)
  return radian_multiplier[unit_key] if unit_key && Mongoid::Geo.mongo_db_version >= 1.7      
  unit_multiplier[unit_key] if unit_key
end

.key(unit = :km) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/mongoid/geo/unit.rb', line 5

def key unit = :km
  unit = unit.to_sym
  methods.grep(/_unit/).each do |meth|
    return meth.to_s.chomp('_unit').to_sym if send(meth).include? unit
  end
  raise ArgumentError, "Unknown unit key: #{unit}"
end

.meters_map ⇒ Object 



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# File 'lib/mongoid/geo/unit.rb', line 49

def meters_map
  {
   :feet => 3.2808,
   :meters => 1,
   :kms => 0.001,
   :miles => 0.00062137,
   :radians => 111170
  }
end

.precision ⇒ Object 



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# File 'lib/mongoid/geo/unit.rb', line 19

def precision
  {
    :feet => 0,
    :meters => 2,
    :kms => 4,
    :miles => 4,
    :radians => 4
  }
end

.radian_multiplier ⇒ Object

from mongoid-geo, as suggested by niedhui :)



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# File 'lib/mongoid/geo/unit.rb', line 30

def radian_multiplier
  { 
    :feet => 364491.8,
    :meters => 111170,
    :kms => 111.17,
    :miles => 69.407,
    :radians => 1
  }
end

.unit_multiplier ⇒ Object 



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# File 'lib/mongoid/geo/unit.rb', line 40

def unit_multiplier
  {
    :feet => 0.305,
    :meters => 1,
    :kms => 6371,
    :miles => 3959
  }
end