[plt-scheme] problem running moby scheme compiler from command line

Hi Jay,

If you just want to play with Moby, the simplest thing to do is just
use it directly from PLaneT.  You can take a look at the very
beginning of:

    http://planet.plt-scheme.org/package-source/dyoo/moby.plt/2/34/planet-docs/manual/index.html

for examples.

For example,  set DrScheme to Module language, and copy and paste the
following into your Definitions window:

  #lang planet dyoo/moby:2:34
  (define WIDTH 320)
  (define HEIGHT 480)
  (define RADIUS 15)

  (define INITIAL-WORLD 0)

  (define (tick w)
    (+ w 5))

  (define (hits-floor? w)
    (>= w HEIGHT))

  (check-expect (hits-floor? 0) false)
  (check-expect (hits-floor? HEIGHT) true)

  (define (render w)
    (place-image (circle RADIUS "solid" "red") (/ WIDTH 2) w
                 (empty-scene WIDTH HEIGHT)))

  (js-big-bang INITIAL-WORLD
               (on-tick 1/15 tick)
               (on-redraw render)
               (stop-when hits-floor?))

Finally, press Run.


For casual use, you don't need the development sources from git; if
you want to build Android packages, you can still do so without
checking the development sources out.