Thanks Sam and Matthias for the tips: I've been able to clean up the directory structure and add a (save-movie) command that writes out an animated gif.
Example: https://github.com/danprager/turtlegraphics/blob/master/docs/animated-circle.gif Matthias wrote: > Thanks, that's great. In what way did you find the existing one lacking? I did start with that existing package, but initially wanted to simplify the process of drawing pictures interactively, and boost the immediate appeal for my kids. Specifically, I wanted: * input and output directly in Dr Racket's REPL window, rather than an an "edit definitions-run-close graphics window" cycle. * a realistic image of a turtle, rather than a triangle. Based on observation of my kids I made improvements to enhance usability and appeal. Main additions: * (undo) and (redo) to improve interactivity * facility to change the turtle's image into e.g. a pink girl * replay all the turtle's steps as an animation: (movie) * (show-program) to recap the interactive commands used so far for copying into the definitions window Of these (movie) is definitely the "wow" feature. BTW: If someone would like to contribute, a bit-blt-based "color-in" operation, that would be great. I should add that after taking Shriram's recent online PLAI course I restructured the whole thing around a sugared and desugared language. This approach allowed me -- amongst other simplifications -- to cleanly separate out the chopping-out-into-frames needed for animation from the rest of the code. Previously both modes of movement were smooshed together. Dan
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