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[rails.git] / lib / quad_tile.rb

diff --git a/lib/quad_tile.rb b/lib/quad_tile.rb
index cb1b5a06e1ee7886ce4ce23e7a8019ee399f9e11..347e7a8176b3e1190ed24c9acc716c735cd12db4 100644 (file)
--- a/lib/quad_tile.rb
+++ b/lib/quad_tile.rb
@@ -3,17 +3,17 @@ module QuadTile
     require "quad_tile/quad_tile_so"
   rescue MissingSourceFile
     def self.tile_for_point(lat, lon)
-      x = ((lon + 180) * 65535 / 360).round
-      y = ((lat + 90) * 65535 / 180).round
+      x = ((lon.to_f + 180) * 65535 / 360).round
+      y = ((lat.to_f + 90) * 65535 / 180).round
 
-      return tile_for_xy(x, y)
+      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|
@@ -22,7 +22,7 @@ module QuadTile
         end
       end
 
-      return tiles
+      tiles
     end
 
     def self.tile_for_xy(x, y)
@@ -30,51 +30,51 @@ module QuadTile
 
       16.times do
         t = t << 1
-        t = t | 1 unless (x & 0x8000).zero?
+        t |= 1 unless (x & 0x8000).zero?
         x <<= 1
         t = t << 1
-        t = t | 1 unless (y & 0x8000).zero?
+        t |= 1 unless (y & 0x8000).zero?
         y <<= 1
       end
 
-      return t
+      t
     end
-  end
 
-  def self.sql_for_area(minlat, minlon, maxlat, maxlon)
-    sql = Array.new
-    single = Array.new
+    def self.iterate_tiles_for_area(bbox)
+      tiles = tiles_for_area(bbox)
+      first = last = nil
 
-    iterate_tiles_for_area(minlat, minlon, maxlat, maxlon) do |first,last|
-      if first == last
-        single.push(first)
-      else
-        sql.push("tile BETWEEN #{first} AND #{last}")
-      end
-    end
+      tiles.sort.each do |tile|
+        if last.nil?
+          first = last = tile
+        elsif tile == last + 1
+          last = tile
+        else
+          yield first, last
 
-    sql.push("tile IN (#{single.join(',')})") if single.size > 0
+          first = last = tile
+        end
+      end
 
-    return "( " + sql.join(" OR ") + " )"
+      yield first, last unless last.nil?
+    end
   end
 
-  def self.iterate_tiles_for_area(minlat, minlon, maxlat, maxlon)
-    tiles = tiles_for_area(minlat, minlon, maxlat, maxlon)
-    first = last = nil
+  def self.sql_for_area(bbox, prefix)
+    sql = []
+    single = []
 
-    tiles.sort.each do |tile|
-      if last.nil?
-        first = last = tile
-      elsif tile == last + 1
-        last = tile
+    iterate_tiles_for_area(bbox) do |first, last|
+      if first == last
+        single.push(first)
       else
-        yield first, last
-
-        first = last = tile
+        sql.push("#{prefix}tile BETWEEN #{first} AND #{last}")
       end
     end
 
-    yield first, last unless last.nil?
+    sql.push("#{prefix}tile IN (#{single.join(',')})") unless single.empty?
+
+    "( " + sql.join(" OR ") + " )"
   end
 
   private_class_method :tile_for_xy, :iterate_tiles_for_area