I’m trying to figure out how to manipulate icons in the icon library to create bitmaps for buttons in the stepper. It appears that the icons in the library are bitmap%’s, and the easy way to combine them is with 2htdp/image, but the result is an image, not a bitmap%, even after using freeze, making it unusable with e.g. compiled-bitmap. I can pursue one of two strategies at this point: digging into the 2htdp code to see how to extract a bitmap% from a frozen image, or trying to figure out how to composite bitmap%’s using only gui library functions. Any advice?

Can you use pict instead of 2htdp/image ?

ooh! I’ll try that. Many thanks!

hmm… actually, pict seems further from bitmap% than image, I can’t even hc-append two bitmaps, and they don’t seem to be “pict-convertible”. Hm.

In a pinch you can save both 2htdp/image and picts to a file and then load them as bitmaps.

There is a pict->bitmap in pict.

And bitmap produces a pict from a bitmap%.

There’s an example at the top of images/icons that combines icons: https://docs.racket-lang.org/images/Icons.html#(part._.About_.These_.Icons)

Excellent! Okay, looks like going through “pict” is the way to go. Many thanks to both of you.

wait… just saw Neil Toronto’s “flomap” module; might be even better.

oof. no, just kidding.