render :xml => doc.to_s
end
-
- # Get a list of the tiles that have changed within a specified time
- # period
- def changes
- zoom = (params[:zoom] || "12").to_i
-
- if params.include?(:start) && params.include?(:end)
- starttime = Time.parse(params[:start])
- endtime = Time.parse(params[:end])
- else
- hours = (params[:hours] || "1").to_i.hours
- endtime = Time.now.getutc
- starttime = endtime - hours
- end
-
- if zoom >= 1 && zoom <= 16 &&
- endtime > starttime && endtime - starttime <= 24.hours
- mask = (1 << zoom) - 1
-
- tiles = Node.where(:timestamp => starttime..endtime).group("maptile_for_point(latitude, longitude, #{zoom})").count
-
- doc = OSM::API.new.get_xml_doc
- changes = XML::Node.new "changes"
- changes["starttime"] = starttime.xmlschema
- changes["endtime"] = endtime.xmlschema
-
- tiles.each do |tile, count|
- x = (tile.to_i >> zoom) & mask
- y = tile.to_i & mask
-
- t = XML::Node.new "tile"
- t["x"] = x.to_s
- t["y"] = y.to_s
- t["z"] = zoom.to_s
- t["changes"] = count.to_s
-
- changes << t
- end
-
- doc.root << changes
-
- render :xml => doc.to_s
- else
- render :plain => "Requested zoom is invalid, or the supplied start is after the end time, or the start duration is more than 24 hours", :status => :bad_request
- end
- end
end