Good question - when I got to that part, I couldn't get the picture language to run either and just wrote code that I compared with other online solutions. I just took a look at the MIT Press website for their SICP code:
http://mitpress.mit.edu/sicp/code/index.html
...but don't see the code needed there to draw graphics. Eli's online solution did, I believe, manage to get graphics working with a non-MIT-Scheme Scheme. But it's not necessary to have running code here to get the benefits of the exercises (unlike later in Chapter 3 and 4!).
Comments
Good question - when I got to that part, I couldn't get the picture language to run either and just wrote code that I compared with other online solutions. I just took a look at the MIT Press website for their SICP code: http://mitpress.mit.edu/sicp/code/index.html
...but don't see the code needed there to draw graphics. Eli's online solution did, I believe, manage to get graphics working with a non-MIT-Scheme Scheme. But it's not necessary to have running code here to get the benefits of the exercises (unlike later in Chapter 3 and 4!).