I want to be able to reproject the current layer's CRS onto the map canvas' CRS. I am using the C++ library with Qt. I have enable the OTF CRS transformation by calling


I then set the Map Canvas's CRS using


where selector lets you select the target CRS and mapCanvas is an instance of QgsMapCanvas. However, once this is called, the current layer disappears. I have tried to reset the extents using setExtent() and refresh().

What am I missing?

1 Answer 1


I have spent many hours solving the same problem! It happend on QGIS 2.18.20. After downgrade to 2.14.10 everything`s ok! OTF working fine))

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