Using ImageMagick to Generate Images

One of the exercises we did this week in the Python workshop used the term "bounding box diagonal". I had a hard time to explain it to the students without an image. Google image search didn't find anything great, so I decided to create such an image.

First I tried with drawing programs, but couldn't make the rectangle a square and the circle non-oval. Then I remembered imagemagick, I have it installed and mostly use it to resize images - but it can do much more. A quick look at the examples and some trial and error, and here's the result.

And here's the script that generated it: