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adbrowning (1) [Avatar] Offline
The text before the last code listing in 2.2.2 (page 61) says that the y attribute of each rectangle should be set to its length - 100 to accommodate for y values growing down the page. The code has the correct setting of 100-length.
elijah.meeks (127) [Avatar] Offline
Thanks for this note.

It's easier to get it right in the code, since the text doesn't give you any feedback...