I try to write a PyQGIS script similar to this: Use of python console to prepare offline map from WMS (tile downloader).
Basically there are two loops to pan the mapCanvas, refresh the mapCanvas and export the mapCanvas to *.png.
iface.mapCanvas().setExtent(QgsRectangle(xmin, ymin, xmax, ymax)) time.sleep(5) iface.mapCanvas().refresh() time.sleep(5) iface.mapCanvas().saveAsImage("D:/GE"+str(i)+"to"+str(j)+"img.png" )
If I execute this code line by line in the Python Console it is working fine. If I use it in a loop georeferenced png will be exported but they are either blank or contain all the same content. As you see above I tried to use time.sleep() to have a timeslot for the map to update. But was not successfull. As Joseph suggested I also tried:
for layer in qgis.utils.iface.mapCanvas().layers(): layer.triggerRepaint()
Same problem here: works line by line in the Python Console but not in a loop.
How to refresh MapCanvas while PyQGIS-script is running?
(QGIS Version 2.14.3)