Method: Geocoder::Calculations#bounding_box

Defined in:
lib/geocoder/calculations.rb

#bounding_box(latitude, longitude, radius, options = {}) ⇒ Object

Returns coordinates of the lower-left and upper-right corners of a box with the given point at its center. The radius is the shortest distance from the center point to any side of the box (the length of each side is twice the radius).

This is useful for finding corner points of a map viewport, or for roughly limiting the possible solutions in a geo-spatial search (ActiveRecord queries use it thusly).



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# File 'lib/geocoder/calculations.rb', line 160

def bounding_box(latitude, longitude, radius, options = {})
  units = options[:units] || :mi
  radius = radius.to_f
  [
    latitude  - (radius / latitude_degree_distance(units)),
    longitude - (radius / longitude_degree_distance(latitude, units)),
    latitude  + (radius / latitude_degree_distance(units)),
    longitude + (radius / longitude_degree_distance(latitude, units))
  ]
end