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[rails.git] / lib / quad_tile.rb

diff --git a/lib/quad_tile.rb b/lib/quad_tile.rb
index a818f6a27f28cae18dd25cc3b287a1bc5eb38912..258fb9fd58a1e660e22283a2f4905404301603ff 100644 (file)
--- a/lib/quad_tile.rb
+++ b/lib/quad_tile.rb
@@ -9,11 +9,11 @@ module QuadTile
       return tile_for_xy(x, y)
     end
 
-    def self.tiles_for_area(minlat, minlon, maxlat, maxlon)
-      minx = ((minlon + 180) * 65535 / 360).round
-      maxx = ((maxlon + 180) * 65535 / 360).round
-      miny = ((minlat + 90) * 65535 / 180).round
-      maxy = ((maxlat + 90) * 65535 / 180).round
+    def self.tiles_for_area(bbox)
+      minx = ((bbox.min_lon + 180) * 65535 / 360).round
+      maxx = ((bbox.max_lon + 180) * 65535 / 360).round
+      miny = ((bbox.min_lat + 90) * 65535 / 180).round
+      maxy = ((bbox.max_lat + 90) * 65535 / 180).round
       tiles = []
 
       minx.upto(maxx) do |x|
@@ -39,13 +39,32 @@ module QuadTile
 
       return t
     end
+
+    def self.iterate_tiles_for_area(bbox)
+      tiles = tiles_for_area(bbox)
+      first = last = nil
+
+      tiles.sort.each do |tile|
+        if last.nil?
+          first = last = tile
+        elsif tile == last + 1
+          last = tile
+        else
+          yield first, last
+
+          first = last = tile
+        end
+      end
+
+      yield first, last unless last.nil?
+    end
   end
 
-  def self.sql_for_area(minlat, minlon, maxlat, maxlon, prefix)
+  def self.sql_for_area(bbox, prefix)
     sql = Array.new
     single = Array.new
 
-    iterate_tiles_for_area(minlat, minlon, maxlat, maxlon) do |first,last|
+    iterate_tiles_for_area(bbox) do |first,last|
       if first == last
         single.push(first)
       else
@@ -58,24 +77,5 @@ module QuadTile
     return "( " + sql.join(" OR ") + " )"
   end
 
-  def self.iterate_tiles_for_area(minlat, minlon, maxlat, maxlon)
-    tiles = tiles_for_area(minlat, minlon, maxlat, maxlon)
-    first = last = nil
-
-    tiles.sort.each do |tile|
-      if last.nil?
-        first = last = tile
-      elsif tile == last + 1
-        last = tile
-      else
-        yield first, last
-
-        first = last = tile
-      end
-    end
-
-    yield first, last unless last.nil?
-  end
-
   private_class_method :tile_for_xy, :iterate_tiles_for_area
 end