[racket] An elm-like racket language?

My current (learning) scenario is to slap a simple GUI onto a specialised
image editor that I have been working on.

At the moment it feels like the way to learn FrTime is by reading and
adapting the examples and diving into the source. Is there a tutorial
somewhere?

Here's my first working reactive program (I'm figuring things out by
looking at the animation examples):

#lang frtime
(require frtime/animation frtime/gui)

(define colors (list "red" "green" "blue"))

(define my-color
  (list-ref colors (make-choice "Color" colors)))

(display-shapes
 (list
  (make-rect (make-posn 0 0) 100 100 (make-rgb 0.5 0 0.5))
  (make-rect (make-posn 100 100) 100 100 my-color)))



How might I get the color to change not just when the user selects
(mouse-ups), but also as a kind of live preview?


Thanks

Dan
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