Many thanks Craig and Bernd for your suggestions

Craig: Unfortunately the docs say revRotatePoly only works with lines, curves 
and polygons

Bernd: Oh! Yes, exporting as png does work to give transparent corner bits! 
Obvious now!

I think I had briefly considered this and rejected it because at the time I was 
conflating the problem with an issue I am going to have later in my project. 
The roundrect graphics are going to be used as niches for a collection of 
images: the images should be scaled and rotated to fit the graphic object (or 
now its png alter-ego). Now while referenced images such as png’s can be 
rotated (more precisely, have their angle set) they lose their scaling, 
reverting to their native size; and rotated images cannot be scaled (why?? 
Rather a strange restriction. I think the graphical engine for LC is showing 
its age rather badly). Which somehow led me to think I had to use the bitmap 
form for snapshots. But if I place and scale the original image, then export 
that as a png,  the exported image should have the required size and so can 
then be rotated without changing its size. I hope.

Neville


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