Leave a trace

[nthiery]

Add command(s) to let the ant draw on the floor. This would open the door for a large range of turtle-style exercises, typically around for loops: draw a square, ...

To build on the metaphor, the ant could leave an odoriferous track. Well, which should be visible as well unlike in reality.

There could be a single command to draw on the current cell. Or two commands scent_on / scent_off -- equivalent to pen-down/pen up --

[nthiery]

The ant can now sow pebbles. Comme le petit poucet. 6fdfc2e. Maybe that's just enough.