lib/geokit-rails/adapters/mysql.rb
module Geokit
module Adapters
class MySQL < Abstract
def sphere_distance_sql(lat, lng, multiplier)
%|
(ACOS(least(1,COS(#{lat})*COS(#{lng})*COS(RADIANS(#{qualified_lat_column_name}))*COS(RADIANS(#{qualified_lng_column_name}))+
COS(#{lat})*SIN(#{lng})*COS(RADIANS(#{qualified_lat_column_name}))*SIN(RADIANS(#{qualified_lng_column_name}))+
SIN(#{lat})*SIN(RADIANS(#{qualified_lat_column_name}))))*#{multiplier})
|
end
def flat_distance_sql(origin, lat_degree_units, lng_degree_units)
%|
SQRT(POW(#{lat_degree_units}*(#{origin.lat}-#{qualified_lat_column_name}),2)+
POW(#{lng_degree_units}*(#{origin.lng}-#{qualified_lng_column_name}),2))
|
end
end
end
end