def getTile(self,x,y,z):
# Use filename as dictionary key, so that zooms which happen to
# use the dataset don't get loaded twice
filename = vmap_load.getVmapFilename(x,y,z,self.d)
if not filename:
return None
# If it doesn't already exist, then load it
if not self.tiles.has_key(filename):
#print("Loading %s" % (filename))
self.tiles[filename] = vmap_load.vmapData(filename)
return self.tiles[filename]
def describe(self, lat,lon):
"""Find the way you're nearest to, and return a description of it"""
z = vmap_load.getVmapBaseZoom(self.d)
(sx,sy) = tilenames.latlon2xy(lat,lon, z)
# download local data
filename = vmap_load.getVmapFilename(sx,sy,z,self.d)
if(filename != self.dataFilename or self.data == None):
#print "road loading %s" % (filename)
self.data = vmap_load.vmapData(filename)
# look for nearest way
(mindist, name) = (1E+10, "not found")
for wid,way in self.data.ways.items():
(lastnlon,lastnlat,lastvalid) = (0,0,False)
wayName = ''
if(way.has_key('N')):
wayName += way['N'] + " "
if(way.has_key('r')):
wayName += way['r'] + " "
if(not wayName):
wayName = "Way #%d" % wid
for n in way['n']: # loop nodes in way
(nlat,nlon,nid) = n
if(lastvalid):
distance = self.distancePointToLine(nlon, nlat, lastnlon, lastnlat, lon, lat)
if(distance < mindist):
mindist = distance
name = wayName
#print "Selecting %s at %d" % (name, mindist)
(lastnlon,lastnlat,lastvalid) = (lon,lat,True)
#print "Done"
return(name)
