Hello I am trying to port TryClojure (https://github.com/Raynes/tryclojure), a web-based REPL, to Racket.
I would like the tutorial part to be based on Racket's 'Quick' tutorial ( http://docs.racket-lang.org/quick/) To do that, I need to evaluate pict expressions, like (circle 10), to a string I can return to the browser for rendering. Right now, I evaluate the strings coming from the browser with the following code: ;;-------------------------------- (define evaluator (parameterize ([sandbox-output 'string] [sandbox-error-output 'string] ...) (call-with-limits #f #f (lambda () (make-evaluator 'slideshow))))) (define (run-code ev str) (define res (ev str)) (define out (get-output ev)) (define err (get-error-output ev)) (list res out err)) ;;-------------------------------- I know I can convert a pict structure like this: (convert a-pict 'png-bytes) but (evaluator "(circle 10)") does not evaluate to a pict structure, so I can't use convert here. I also cannot see how to use bitmap% save-file method here, because I cannot get my hands on the bitmap object Is there a way to parameterize how picts are rendered so I can end up with a PNG bytestring ? Thank you Manu
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