def refreshtiles_get(self, canvasextent, canvascrs, widthpx, forcedownload=False, cancelledcallback=None):
extll = osm.unproject(canvasextent, canvascrs)
zoom = self.zoom(widthpx, extll)
if zoom is None or self.tiletype is None:
return list(self.loadedlayers.keys()), [], []
tiles = osm.tiles(extll.xMinimum(), extll.xMaximum(),
extll.yMinimum(), extll.yMaximum(), zoom)
if forcedownload:
tilestoclean = list(self.loadedlayers.keys())
tilestoload = tiles
else:
loadedtiles = set(self.loadedlayers.keys())
tilestoclean = loadedtiles.difference(set(tiles))
tilestoload = list(set(tiles).difference(loadedtiles))
#calculate file names and urls
cachedir = qosmsettings.get(qosmsettings.CACHE_DIRECTORY)
tilefiles = [tm.filename(cachedir, self.tiletype, tile, zoom) for tile in tilestoload]
tileurls = [tm.tileurl(self.tiletype, tile, zoom) for tile in tilestoload]
if qosmsettings.get(qosmsettings.AUTODOWNLOAD):
#download (keep on same thread for now)
if not cancelledcallback:
cancelledcallback = lambda: False
dlerrors = []
downloader.download(tileurls, tilefiles, overwrite=forcedownload,
errorhandler=dlerrors.append,
cancelledcallback=cancelledcallback)
if dlerrors:
self.rendererrors += 1
return tilestoclean, tilestoload, tilefiles
def run(self):
log("ensuring %s tiles are downloaded" % len(self.tilelist))
cachedir = qosmsettings.get(qosmsettings.CACHE_DIRECTORY)
tilefiles = [tm.filename(cachedir, self.tiletype, tile[0:2], tile[2]) for tile in self.tilelist]
tileurls = [tm.tileurl(self.tiletype, tile[0:2], tile[2]) for tile in self.tilelist]
if not self.overwrite:
#remove existing files
indicies = []
for i in range(len(tilefiles)):
if os.path.exists(tilefiles[i]):
indicies.append(i)
log("removing %s tiles that already exist" % len(indicies))
for i in reversed(indicies):
tilefiles.pop(i)
tileurls.pop(i)
downloader.download(tileurls, tilefiles, self.overwrite, errorhandler=self.emiterror, progresshandler=self.emitprogress,
cancelledcallback=self.isCancelled)
