56 lines
1.2 KiB
Ruby
56 lines
1.2 KiB
Ruby
class GeoRecord < ActiveRecord::Base
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before_save :update_tile
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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 self.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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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 * 10000000).round
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end
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def lon=(l)
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self.longitude = (l * 10000000).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 / 10000000
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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 / 10000000
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end
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# Potlatch projections
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def lon_potlatch(baselong,masterscale)
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(self.lon-baselong)*masterscale
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end
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def lat_potlatch(basey,masterscale)
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-(lat2y(self.lat)-basey)*masterscale
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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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end
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