WeScheme

WeScheme is a browser-based version of Racket. It works well for at least the first semester of Intermediate Computer Science.

Special notes for WeScheme users

You can use WeScheme if you cannot install [DrRacket](http://racket -lang.org). For example, if you have a Chromebook for your home computer.

There are a few differences:

• Omit the (require picturing-programs) line.

• (Chapter 3) Instead of copy and pasting in a picture, you need to copy the link for the image and use bitmap/url like this:

(bitmap/url "https://www.what-dog.net/Images/faces2/main004.jpg")

• (Chapter 6) Inside big-bang you need to use the phrase to-draw instead of on-draw that we use in DrRacket.

  (define (draw-handler model) 
      (overlay model (empty-scene 300 200)))
  (define (tick-handler model) 
      (scale 1.01 model))
  
  (big-bang (circle 10 "solid" "green")
            (on-tick tick-handler)
            (to-draw draw-handler))