qgis - PyQGIS make screenshot of mapCanvas after setExtent is called

I have the following function:

def createScreenshots(layer):
  counter = 0
  for feature in layer.getFeatures():
    counter += 1

    point = feature.geometry().asPoint()
    qgis.utils.iface.mapCanvas().setCenter(point)
    qgis.utils.iface.mapCanvas().refreshAllLayers()
    qgis.utils.iface.mapCanvas().saveAsImage("D:\\\\m\\testing\\" + str(counter) + ".png")

Screenshots are not in real coordinates, .pgw header is not in right coordinates, therefore resulting png images are shifted.

Question: How to wait for rendering of canvas after setCenter is called?

Answer

ids = None


def createScreenshot4(layer):
  global ids
  ids = layer.allFeatureIds()

  def exportMap():
    global ids
    qgis.utils.iface.mapCanvas().saveAsImage( "D:\\\\ma\\bo\\{}.png".format( ids.pop() ) )
    if ids:
        setNextFeatureExtent()
    else: # We're done

        qgis.utils.iface.mapCanvas().mapCanvasRefreshed.disconnect( exportMap )

  def setNextFeatureExtent():
    reqq = QgsFeatureRequest()
    reqq.setFilterFid(ids[-1])
    for feature in layer.getFeatures(reqq):
        point = feature.geometry().asPoint()
        qgis.utils.iface.mapCanvas().setCenter(point)
        qgis.utils.iface.mapCanvas().refreshAllLayers()



  qgis.utils.iface.mapCanvas().mapCanvasRefreshed.connect( exportMap )
  setNextFeatureExtent() # Let's start

Resulted code with setCenter and refreshAllLayers.