Hi Tim, Does it help if you directly call `mapCanvas.setDestinationCrs()` instead of setting the crs on `mapSettings()`?
The returned mapSettings object is not meant to be modified. Matthias On Tue, Nov 17, 2020 at 12:58 AM Tim Sutton <[email protected]> wrote: > Hi Folks > > I am trying to update a 2.x snippet I have which iteratively sets the CRS > with sequentially higher LO values: > > https://gist.github.com/timlinux/1057c2c6b5ebda6ed2b5aa8c5aa21372 > > # Uses a trick from Alexander Neto: "I created a orthographic projection > with lisbon longitude, but with a south hemisphere latitude > # That way kinda looks 3d" > # This will make the QGIS use a world projection and then move the center > # of the CRS sequentially to create a spinning globe effect > import time > from subprocess import call > longitude_increments = 5 > image_counter = 1 > for i in range(-180, 180, longitude_increments): > definition = ( > '+proj=ortho +lat_0=-20 +lon_0=%i +x_0=0 +y_0=0 +R=6371000 +units=m > +no_defs +type=crs' % i) > crs = QgsCoordinateReferenceSystem() > crs.createFromProj(definition) > iface.mapCanvas().mapSettings().setDestinationCrs(crs) > #iface.mapCanvas().setMapUnits(0) > iface.mapCanvas().refresh() > iface.mapCanvas().saveAsImage( > '/tmp/globe-%03d.png' % image_counter) > image_counter += 1 > print (definition) > time.sleep(1) > # Now generate the GIF. If this fails try run the call from the command > line > # and check the path to convert (provided by ImageMagick) is correct... > call('/usr/bin/convert -delay 35 -loop 0 /tmp/globe-*.png /tmp/globe.gif') > > The example python above using Orthographc North will hopefully make a > more pleasing looking spinny globe. However, in QGIS 3.x the code runs > but if I inspect the mapcanvas CRS after setting the new CRS, it still > shows the old CRS. Can anyone see what I am missing here? > > Thanks! > > Regards > > Tim > > -- > > ------------------------------------------------------------------------------------------ > > Tim Sutton > Visit http://kartoza.com to find out about open source: > * Desktop GIS programming services > * Geospatial web development > * GIS Training > * Consulting Services > Tim is a member of the QGIS Project Steering Committee > > ------------------------------------------------------------------------------------------- > _______________________________________________ > QGIS-Developer mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
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