Path (Pen)
Shortcut P

The pen halfway through a path: the points placed, the curve pulled with its tangent and the segment following the pointer, with its length

Placing points

GestureWhat it does
Clickplaces a corner point (a straight segment, if there was no curve before)
Press and dragplaces the point on release and pulls out the tangent: the incoming and outgoing segments stay continuous with each other
Click on the last pointbreaks the continuity: the next segment starts again without a handle
Going back to the first pointcloses the path (within 10 pixels); dragging while closing gives the loop its curvature
⇧45° angles from the last point

After a curved segment, a click does not flatten the incoming segment: the curve keeps curving, tangent at both ends. The snapping axes and diagonals start again from the last point placed. The direction handle does not snap: it is a direction, not a point.

Curve or arc

In the tool's bar:

ModeWhat it does
curvedragging pulls out the direction handles
arcthe segment is a circular arc tangent to the way you left the previous point. The first arc of a path needs one extra click, which gives the starting tangent

Line is not a mode: two points without handles give a straight segment in both.

The length

The field in the bar sets the length of the next segment, in the project unit: the point is placed at that distance, in the direction you are pointing. It applies to one segment only. Typing a digit while drawing opens the Length dialog, as for the line.

Finishing

KeyWhat it does
Enterplaces the path open
check mark in the barfinishes the path, keeping what is drawn
Escexits the current segment, keeping the points already placed; the Pen stays selected
⌘ Zremoves the last point

When you close the path, with Enter or with the check mark, the Selection tool comes back with the path selected; with Esc the Pen stays selected. While you draw, each point is one undo step; once finished, the whole path is a single step. A path with a single point is not kept.