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[rails.git] / lib / geo_record.rb

diff --git a/lib/geo_record.rb b/lib/geo_record.rb
index d5604d4d36db5882aafd2cff00d25816294dcb16..e02734ec909dc8064f78d2cf8e17455287939911 100644 (file)
--- a/lib/geo_record.rb
+++ b/lib/geo_record.rb
@@ -1,20 +1,36 @@
+require "delegate"
+
 module GeoRecord
-  def before_save
-    self.update_tile
+  # Ensure that when coordinates are printed that they are always in decimal degrees,
+  # and not e.g. 4.0e-05
+  # Unfortunately you can't extend Numeric classes directly (e.g. `Coord < Float`).
+  class Coord < DelegateClass(Float)
+    def initialize(obj)
+      super(obj)
+    end
+
+    def to_s
+      format("%.7f", self)
+    end
+  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 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
   # * returns true/false
   def in_world?
-    return false if self.lat < -90 or self.lat > 90
-    return false if self.lon < -180 or self.lon > 180
-    return true
-  end
+    return false if lat < -90 || lat > 90
+    return false if lon < -180 || lon > 180
 
-  def self.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
+    true
   end
 
   def update_tile
@@ -22,37 +38,20 @@ module GeoRecord
   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
+    Coord.new(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
-  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))
+    Coord.new(longitude.to_f / SCALE)
   end
-
 end
-