- #COUNT is the number of map requests to allow before exiting and starting a new process
- @@count = COUNT
-
- # The maximum area you're allowed to request, in square degrees
- MAX_REQUEST_AREA = 0.25
-
-
- # Number of GPS trace/trackpoints returned per-page
- TRACEPOINTS_PER_PAGE = 5000
-
- def trackpoints
- @@count+=1
- response.headers["Content-Type"] = 'text/xml'
- #retrieve the page number
- page = params['page'].to_i
- unless page
- page = 0;
- end
-
- unless page >= 0
- report_error("Page number must be greater than or equal to 0")
- return
- end
-
- offset = page * TRACEPOINTS_PER_PAGE
-
- # Figure out the bbox
- bbox = params['bbox']
- unless bbox and bbox.count(',') == 3
- report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
- return
- end
-
- bbox = bbox.split(',')
-
- min_lon = bbox[0].to_f
- min_lat = bbox[1].to_f
- max_lon = bbox[2].to_f
- max_lat = bbox[3].to_f
-
- # check the bbox is sane
- unless min_lon <= max_lon
- report_error("The minimum longitude must be less than the maximum longitude, but it wasn't")
- return
- end
- unless min_lat <= max_lat
- report_error("The minimum latitude must be less than the maximum latitude, but it wasn't")
- return
- end
- unless min_lon >= -180 && min_lat >= -90 && max_lon <= 180 && max_lat <= 90
- report_error("The latitudes must be between -90 and 90, and longitudes between -180 and 180")
- return
- end
-
- # check the bbox isn't too large
- requested_area = (max_lat-min_lat)*(max_lon-min_lon)
- if requested_area > MAX_REQUEST_AREA
- report_error("The maximum bbox size is " + MAX_REQUEST_AREA.to_s + ", and your request was too large. Either request a smaller area, or use planet.osm")
- return
- end
-
- # integerise
- min_lat = min_lat * 1000000
- max_lat = max_lat * 1000000
- min_lon = min_lon * 1000000
- max_lon = max_lon * 1000000
- # get all the points
- points = Tracepoint.find(:all, :conditions => ['latitude BETWEEN ? AND ? AND longitude BETWEEN ? AND ?', min_lat.to_i, max_lat.to_i, min_lon.to_i, max_lon.to_i], :select => "SELECT DISTINCT *", :offset => offset, :limit => TRACEPOINTS_PER_PAGE, :order => "timestamp DESC" )
-
- doc = XML::Document.new
- doc.encoding = 'UTF-8'
- root = XML::Node.new 'gpx'
- root['version'] = '1.0'
- root['creator'] = 'OpenStreetMap.org'
- root['xmlns'] = "http://www.topografix.com/GPX/1/0/"
-
- doc.root = root
-
- track = XML::Node.new 'trk'
- doc.root << track
-
- trkseg = XML::Node.new 'trkseg'
- track << trkseg
-
- points.each do |point|
- trkseg << point.to_xml_node()