Locking points onto the drawing's own linework, onto your other takeoff, and onto angles.
Snapping is what makes a takeoff trace the drawing instead of approximating it. Points jump onto the linework, onto the corners of work you have already done, or onto a clean angle, so a pad traced at speed still closes on its real corners.
Each is an on/off toggle that stays on until you turn it off, and they combine.
| Key | Mode | Snaps to |
|---|---|---|
| F1 | Vector snap | The PDF's own linework - the lines the designer drew. |
| F2 | Point snap | Vertices of your other takeoff drawings on the page, including holes. |
| F3 | Page snap | The page itself. |
| F4 | Angle snapping | Clean angles from the last point. |
With a tool armed but before the first point is placed, a marker previews what the next click will land on, so you can see the snap before you commit to it.
Snapping twice in a row onto the same shape's edge arms an edge trace: instead of placing two points and a straight line between them, the drawing follows that shape's edge. It is how a new area is made to share a boundary exactly with one already drawn, rather than nearly.
The four modes above act while you draw. Three separate commands act on a drawing that already exists, pulling it onto something once:
| Key | Action |
|---|---|
| F8 | Snap Points |
| F7 | Snap Lines |
| F6 | Snap Pages |
F1 to F4 are modes that stay on; F6 to F8 are one-shot actions on the current selection. Two rows of function keys that both say "snap" do different kinds of thing, which is worth knowing before you reach for one mid-trace.