Use quad tiling to select bugs in an area

[rails.git] / lib / map_boundary.rb

diff --git a/lib/map_boundary.rb b/lib/map_boundary.rb
index f337c12f1732f43d510aed52bb3a7091b96d80ad..b3085d0ec0c83ed6ceb3150bca329eb35d28dd1e 100644 (file)
--- a/lib/map_boundary.rb
+++ b/lib/map_boundary.rb
@@ -1,21 +1,32 @@
 module MapBoundary
-   def check_boundaries(min_lon, min_lat, max_lon, max_lat)
-      # check the bbox is sane
-      unless min_lon <= max_lon
-        raise("The minimum longitude must be less than the maximum longitude, but it wasn't")
-      end
-      unless min_lat <= max_lat
-        raise("The minimum latitude must be less than the maximum latitude, but it wasn't")
-      end
-      unless min_lon >= -180 && min_lat >= -90 && max_lon <= 180 && max_lat <= 90
-        raise("The latitudes must be between -90 and 90, and longitudes between -180 and 180")
-      end
+  # Take an array of length 4, and return the min_lon, min_lat, max_lon and 
+  # max_lat within their respective boundaries.
+  def sanitise_boundaries(bbox)
+    min_lon = [[bbox[0].to_f,-180].max,180].min
+    min_lat = [[bbox[1].to_f,-90].max,90].min
+    max_lon = [[bbox[2].to_f,+180].min,-180].max
+    max_lat = [[bbox[3].to_f,+90].min,-90].max
+    return min_lon, min_lat, max_lon, max_lat
+  end
 
-      # check the bbox isn't too large
-      requested_area = (max_lat-min_lat)*(max_lon-min_lon)
-      if requested_area > APP_CONFIG['max_request_area']
-        raise("The maximum bbox size is " + APP_CONFIG['max_request_area'].to_s + 
-          ", and your request was too large. Either request a smaller area, or use planet.osm")
-      end
+  def check_boundaries(min_lon, min_lat, max_lon, max_lat, max_area = MAX_REQUEST_AREA)
+    # check the bbox is sane
+    unless min_lon <= max_lon
+      raise OSM::APIBadBoundingBox.new("The minimum longitude must be less than the maximum longitude, but it wasn't")
     end
+    unless min_lat <= max_lat
+      raise OSM::APIBadBoundingBox.new("The minimum latitude must be less than the maximum latitude, but it wasn't")
+    end
+    unless min_lon >= -180 && min_lat >= -90 && max_lon <= 180 && max_lat <= 90
+      # Due to sanitize_boundaries, it is highly unlikely we'll actually get here
+      raise OSM::APIBadBoundingBox.new("The latitudes must be between -90 and 90, and longitudes between -180 and 180")
+    end
+
+    # check the bbox isn't too large
+    requested_area = (max_lat-min_lat)*(max_lon-min_lon)
+    if requested_area > max_area
+      raise OSM::APIBadBoundingBox.new("The maximum bbox size is " + max_area.to_s + 
+        ", and your request was too large. Either request a smaller area, or use planet.osm")
+    end
+  end
 end