P is the path, one point per row, starting at the feature being pointed at and ending where the note sits. Two points make the usual straight leader; three make one with a horizontal landing, which is what a note of more than a word or two wants.

The note is placed at the last point. It may carry the codes of draw.symbol, so a thread callout or a tolerance reads properly.

See also: diam, radius, draw.symbol

Source Code: draw.Drawing