maps/controllers/directions.py

   1 import json
   2 import logging
   3 import os
   4 import site
   5 import sys
   6
   7 from pylons import request, response, session, tmpl_context as c
   8 from pylons.controllers.util import abort, redirect_to
   9 from maps.lib.base import BaseController, render
  10
  11 # Ugh.
  12 project_root = os.path.dirname(os.path.abspath(__file__)) + '/../../../..'
  13 site.addsitedir(project_root + '/src')
  14 import KML
  15
  16
  17 log = logging.getLogger(__name__)
  18
  19 class DirectionsController(BaseController):
  20
  21     # Google geocodes the start and end coordinates
  22     # automatically. There's no other way to pass the "name" of a
  23     # route back to the server, so we have to rely on the geocoded
  24     # names for identification.
  25     def get_route_address(self, route, start=True):
  26         location_string = "start"
  27
  28         if not start:
  29             # There are only two named properties, one for
  30             # start_geocode and one for end_geocode.
  31             location_string = "end"
  32
  33         # Get the GeocoderResponse object.
  34         gr = route[location_string + '_geocode']
  35
  36         try:
  37             return gr['formatted_address']
  38         except:
  39             return 'Unknown'
  40
  41
  42     def directions_result_to_placemarks(self, result):
  43         placemarks = []
  44         trip_idx = 0
  45
  46         for trip in result['trips']:
  47             trip_idx += 1
  48
  49             for route in trip['routes']:
  50                 p = KML.Placemark()
  51                 route_start = self.get_route_address(route, True)
  52                 route_end   = self.get_route_address(route, False)
  53                 route_name  = route_start + " to " + route_end
  54                 route_name += ' (' + str(trip_idx) + ')'
  55                 name_element = KML.Name(route_name)
  56                 p.children.append(name_element)
  57                 ls = KML.LineString()
  58
  59                 coords = KML.Coordinates()
  60
  61                 for step in route['steps']:
  62                     for coord in step['lat_lngs']:
  63                         coords.text += str(coord.values()[1])
  64                         coords.text += ','
  65                         coords.text += str(coord.values()[0])
  66                         coords.text += ',0 '
  67
  68                 ls.children.append(coords)
  69                 p.children.append(ls)
  70                 placemarks.append(p)
  71
  72         return placemarks
  73
  74
  75     def json_to_kml(self):
  76         directions_array = json.loads(request.POST['directions_result'])
  77         placemarks = []
  78         for result in directions_array:
  79             placemarks += self.directions_result_to_placemarks(result)
  80
  81         doc = KML.Document()
  82         for p in placemarks:
  83             doc.children.append(p)
  84
  85         response.content_type = 'application/vnd.google-earth.kml+xml'
  86         response.headers['Content-disposition'] = 'attachment; filename=routes.kml'
  87         return doc.to_kml()
  88