Drawing strokes

A while back, I was unhappy with the lack of a straightforward reckonlist to draw strokes on a setting of straight rows. So, yesterday, I went to make the such a reckonlist. It's still a rough draught, but here it is: Drawing Strokes. So far, it doesn't tell thou how to work it, so here goes: Click on the leaf once to start drawing, ctrl to snap to 45° and 90° slopes, another time to set another dot in the stroke, and click twice on the same dot to end the line. Z to undo, shift-Z to unundo.