Use quad tiling to select bugs in an area

[rails.git] / lib / geo_record.rb

diff --git a/lib/geo_record.rb b/lib/geo_record.rb
index d5604d4d36db5882aafd2cff00d25816294dcb16..90dee5f1dc43ceb424d1f78c934082d2370e0ce1 100644 (file)
--- a/lib/geo_record.rb
+++ b/lib/geo_record.rb
@@ -1,4 +1,13 @@
 module GeoRecord
+  # 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.extend(ClassMethods)
+  end
+
   def before_save
     self.update_tile
   end
@@ -11,48 +20,39 @@ module GeoRecord
     return true
   end
 
-  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
-  end
-
   def update_tile
     self.tile = QuadTile.tile_for_point(lat, lon)
   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
+    return self.latitude.to_f / SCALE
   end
 
   # Return WGS84 longitude
   def lon
-    return self.longitude.to_f / 10000000
+    return self.longitude.to_f / SCALE
   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
+private
   
   def lat2y(a)
     180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
   end
 
+  module ClassMethods
+    def 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
+    end
+  end
 end
-