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:

	#!/bin/bash
	# Generate "Bounding Box Diagonal" image
	convert \
	-size 400x400 \
	xc:skyblue \
	-fill red \
	-draw "circle 200,200 0,200" \
	-stroke black \
	-strokewidth 2 \
	-draw "line 0,0 400,400" \
	-stroke skyblue \
	-pointsize 40 \
	-draw "rotate 45 text 250,10 \"bbd\"" \
	bbd.png

view raw gen-bbd.sh hosted with ❤ by GitHub