source: subversion/sites/rails_port/lib/geo_record.rb @ 19402

Last change on this file since 19402 was 14586, checked in by tomhughes, 11 years ago

Merge api06 branch to trunk.

File size: 1.3 KB
Line 
1module GeoRecord
2  # This scaling factor is used to convert between the float lat/lon that is
3  # returned by the API, and the integer lat/lon equivalent that is stored in
4  # the database.
5  SCALE = 10000000
6 
7  def self.included(base)
8    base.extend(ClassMethods)
9  end
10
11  def before_save
12    self.update_tile
13  end
14
15  # Is this node within -90 >= latitude >= 90 and -180 >= longitude >= 180
16  # * returns true/false
17  def in_world?
18    return false if self.lat < -90 or self.lat > 90
19    return false if self.lon < -180 or self.lon > 180
20    return true
21  end
22
23  def update_tile
24    self.tile = QuadTile.tile_for_point(lat, lon)
25  end
26
27  def lat=(l)
28    self.latitude = (l * SCALE).round
29  end
30
31  def lon=(l)
32    self.longitude = (l * SCALE).round
33  end
34
35  # Return WGS84 latitude
36  def lat
37    return self.latitude.to_f / SCALE
38  end
39
40  # Return WGS84 longitude
41  def lon
42    return self.longitude.to_f / SCALE
43  end
44
45private
46 
47  def lat2y(a)
48    180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
49  end
50
51  module ClassMethods
52    def find_by_area(minlat, minlon, maxlat, maxlon, options)
53      self.with_scope(:find => {:conditions => OSM.sql_for_area(minlat, minlon, maxlat, maxlon)}) do
54        return self.find(:all, options)
55      end
56    end
57  end
58end
59
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