source: subversion/sites/rails_port/app/models/geo_record.rb @ 6762

Last change on this file since 6762 was 6762, checked in by tomhughes, 12 years ago

Move in_world? to GeoRecord? model and correct comment.

File size: 1.2 KB
Line 
1class GeoRecord < ActiveRecord::Base
2  before_save :update_tile
3
4  # Is this node within -90 >= latitude >= 90 and -180 >= longitude >= 180
5  # * returns true/false
6  def in_world?
7    return false if self.lat < -90 or self.lat > 90
8    return false if self.lon < -180 or self.lon > 180
9    return true
10  end
11
12  def self.find_by_area(minlat, minlon, maxlat, maxlon, options)
13    self.with_scope(:find => {:conditions => OSM.sql_for_area(minlat, minlon, maxlat, maxlon)}) do
14      return self.find(:all, options)
15    end
16  end
17
18  def update_tile
19    self.tile = QuadTile.tile_for_point(lat, lon)
20  end
21
22  def lat=(l)
23    self.latitude = (l * 10000000).round
24  end
25
26  def lon=(l)
27    self.longitude = (l * 10000000).round
28  end
29
30  # Return WGS84 latitude
31  def lat
32    return self.latitude.to_f / 10000000
33  end
34
35  # Return WGS84 longitude
36  def lon
37    return self.longitude.to_f / 10000000
38  end
39
40  # Potlatch projections
41  def lon_potlatch(baselong,masterscale)
42    (self.lon-baselong)*masterscale
43  end
44
45  def lat_potlatch(basey,masterscale)
46    -(lat2y(self.lat)-basey)*masterscale
47  end
48 
49  private
50 
51  def lat2y(a)
52    180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
53  end
54
55end
56
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