module GeoRecord
- def self.included(base)
- base.extend(ClassMethods)
- end
+ # This scaling factor is used to convert between the float lat/lon that is
+ # returned by the API, and the integer lat/lon equivalent that is stored in
+ # the database.
+ SCALE = 10000000
- def before_save
- self.update_tile
+ def self.included(base)
+ base.scope :bbox, ->(bbox) { base.where(OSM.sql_for_area(bbox)) }
+ base.before_save :update_tile
end
# Is this node within -90 >= latitude >= 90 and -180 >= longitude >= 180
end
def lat=(l)
- self.latitude = (l * 10000000).round
+ self.latitude = (l * SCALE).round
end
def lon=(l)
- self.longitude = (l * 10000000).round
+ self.longitude = (l * SCALE).round
end
# Return WGS84 latitude
def lat
- return self.latitude.to_f / 10000000
+ return self.latitude.to_f / SCALE
end
# Return WGS84 longitude
def lon
- return self.longitude.to_f / 10000000
- end
-
- # Potlatch projections
- def lon_potlatch(baselong,masterscale)
- (self.lon-baselong)*masterscale
+ return self.longitude.to_f / SCALE
end
- def lat_potlatch(basey,masterscale)
- -(lat2y(self.lat)-basey)*masterscale
- end
-
private
-
+
def lat2y(a)
180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
end
-
- module ClassMethods
- def find_by_area(minlat, minlon, maxlat, maxlon, options)
- self.with_scope(:find => {:conditions => OSM.sql_for_area(minlat, minlon, maxlat, maxlon)}) do
- return self.find(:all, options)
- end
- end
- end
end
-