Flood Fill Algorithm? – Help with Snap! – Snap! Forum https://forum.snap.berkeley.edu/t/flood-fill-algorithm/3693
Snap! has a perfectly good Fill code block (available under the Pen block palette). However, areas filled using this code block evidently cannot be exported as SVG (scalable vector graphic) files (unless I'm missing some…
I did this exercise once a long time ago (in Atari Logo!)