Running slideshow/widescreen and slideshow/fullscreen modules directly

[LiberalArtist]

Currently, the only way to control the actual aspect ratio used for #f seems to be extra-linguistically, via the slideshow executable.

I think it would make sense for running a program in #lang slideshow/widescreen or #lang slideshow/fullscreen directly via racket or DrRacket to set the default aspect ratio accordingly. In particular, when using DrRacket to run a module in #lang slideshow/widescreen that incorporates a library slide function with an adaptive aspect ratio, the library slide will currently be in full-screen, which I found surprising.

It might also make sense for running the slideshow executable without an explicit --widescreen or --fullscreen argument to similarly let #lang slideshow/widescreen and #lang slideshow/fullscreen establish the default aspect ratio, though that seems like it would be more complicated to implement.

[mflatt]

It has been a few years, and things are mostly still in the same state.

I haven't been motivated to improve on the state of the implementation here, because I just moved completely over to widescreen mode. It's nice that slides can be adaptive in principle, but I don't use that. Even when I run old talks, I normally want to modernize a detail or two, and it's easy to adjust to widescreen along the way. (Usually, it's a matter of improving a slide or two that looks needlessly crowded.)

The only thing I wonder is whether it would make sense to switch to widescreen as the default, instead of fullscreen. That way, I don't have to remember how to run slideshow --widescreen --save-aspect when I set up a new machine, and the occasional new Slideshow user would not have to discover that approach. People who have fullscreen slides might need to run slideshow --fullscreen --save-aspect after upgrading Racket, but hopefully that's fewer people than potential future users who want widescreen mode.