My app compiles and runs fine, as described in the book. However, when I rotate the device to landscape orientation, all graph elements are stretched horizontally and squished vertically to fit. I swapped in your GraphView.m code just to make sure I didn't have a typo, and I get the same result. Yet the finished app does not have this problem. Did I miss something or do we discover and solve this problem later on?

Fixed on page 268.