Nice! Keep pushing this project -- Matthias
On Feb 22, 2013, at 3:30 PM, Daniel Prager wrote: > 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 > ____________________ > Racket Users list: > http://lists.racket-lang.org/users
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