78 lines
2.1 KiB
Ruby
78 lines
2.1 KiB
Ruby
module GeoRecord
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# This scaling factor is used to convert between the float lat/lon that is
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# returned by the API, and the integer lat/lon equivalent that is stored in
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# the database.
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SCALE = 10000000
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def self.included(base)
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base.extend(ClassMethods)
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end
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def before_save
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self.update_tile
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end
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# Is this node within -90 >= latitude >= 90 and -180 >= longitude >= 180
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# * returns true/false
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def in_world?
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return false if self.lat < -90 or self.lat > 90
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return false if self.lon < -180 or self.lon > 180
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return true
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end
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def update_tile
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self.tile = QuadTile.tile_for_point(lat, lon)
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end
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def lat=(l)
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self.latitude = (l * SCALE).round
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end
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def lon=(l)
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self.longitude = (l * SCALE).round
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end
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# Return WGS84 latitude
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def lat
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return self.latitude.to_f / SCALE
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end
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# Return WGS84 longitude
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def lon
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return self.longitude.to_f / SCALE
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end
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# Generic checks that are run for the updates and deletes of
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# node, ways and relations. This code is here to avoid duplication,
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# and allow the extention of the checks without having to modify the
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# code in 6 places for all the updates and deletes. Some of these tests are
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# needed for creates, but are currently not run :-(
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# This will throw an exception if there is an inconsistency
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def check_consistency(old, new, user)
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if new.version != old.version
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raise OSM::APIVersionMismatchError.new(new.version, old.version)
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elsif new.changeset.nil?
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raise OSM::APIChangesetMissingError.new
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elsif new.changeset.empty?
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raise OSM::APIChangesetMissingError.new
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elsif new.changeset.user_id != user.id
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raise OSM::APIUserChangesetMismatchError.new
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elsif not new.changeset.is_open?
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raise OSM::APIChangesetAlreadyClosedError.new
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end
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end
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private
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def lat2y(a)
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180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
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end
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module ClassMethods
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def find_by_area(minlat, minlon, maxlat, maxlon, options)
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self.with_scope(:find => {:conditions => OSM.sql_for_area(minlat, minlon, maxlat, maxlon)}) do
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return self.find(:all, options)
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end
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end
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end
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end
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