I posted this as a bug at https://github.com/qgis/QGIS/issues/41248 and Giovanni Manghi suggested I bring it here.
For a lot of users, QGIS currently shows the main map canvas at the wrong scale, whenever their systemwide "display scaling"(=logical dpi) doesn't match their screen's physical dpi. It's disconcerting side-by-side with a printed map, and just incorrect. We can do better, since Qt exposes both logical and physical dpi. But fixing it would change on-screen behaviour users are accustomed to. I think the right solution is to continue using logical DPI for QGIS UI elements, but initialize mapCanvas().mapSettings().outputDPI() from iface.mainWindow().physicalDpiX() rather than .logicalDpiX(). And to make this change opt-in via a setting in Options / Canvas & Legend called something like "Render canvas at", with a choice of"System DPI" (=logical DPI), "Physical screen DPI", or a user-defined DPI (since I'm sure some external monitors will have physical DPI wrong). More details at https://github.com/qgis/QGIS/issues/41248 Comments welcome here or there; I know this will be a bit controversial since we've all gotten used to the "wrong" way on our screens! -- Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Developer-f4099106.html _______________________________________________ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
