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 tiles(extll, minzoom, maxzoom=None):
if maxzoom is None:
maxzoom = minzoom
alltiles = []
for zoom in range(minzoom, maxzoom+1):
alltiles = alltiles + osm.tiles(extll.xMinimum(), extll.xMaximum(),
extll.yMinimum(), extll.yMaximum(), zoom)
return alltiles
def zoom(self, widthpx, extll):
if self.specifiedzoom is None:
maxzoom = tm.maxzoom(self.tiletype) if self.maxzoom is None else self.maxzoom
autozoom = osm.autozoom(widthpx/(extll.xMaximum()-extll.xMinimum()))
return min(max((tm.minzoom(self.tiletype), autozoom)),
maxzoom)
else:
numtiles = len(osm.tiles(extll.xMinimum(), extll.xMaximum(),
extll.yMinimum(), extll.yMaximum(), self.specifiedzoom))
if numtiles > qosmsettings.get(qosmsettings.MAX_TILES):
log("too many tiles for fixed zoom layer!: %s" % numtiles)
self.rendererrors += 1
return None
else:
return self.specifiedzoom
def set_summarystats(self):
numtiles = len(self.layer.loadedlayers)
zoom = self.layer.actualzoom if self.layer.specifiedzoom is None else \
self.layer.specifiedzoom
extent = self.iface.mapCanvas().extent()
crs = self.iface.mapCanvas().mapRenderer().destinationCrs()
widthpx = self.iface.mapCanvas().width()
extll = osm.unproject(extent, crs)
calczoom = osm.autozoom(widthpx/(extll.xMaximum()-extll.xMinimum()))
layerzoom = calczoom if zoom is None else zoom
numtilestot = len(osm.tiles(extll.xMinimum(), extll.xMaximum(),
extll.yMinimum(), extll.yMaximum(), layerzoom))
self.statusText.setText("Loaded %s of %s tiles at zoom level %s (automatic zoom would be %s). \
%s rendering errors (see QOSM Settings/Logs for more details)." %
(numtiles, numtilestot, zoom, calczoom, self.layer.rendererrors))
