Tracking
Tracking constrains the direction of new points to specific angles, helping you draw accurately without typing coordinates.
Ortho Mode
Ortho mode constrains all cursor movement to horizontal or vertical directions only. When ortho is active you can only pick points that are exactly 0°, 90°, 180°, or 270° from the previous point.
This is the fastest way to draw perfectly horizontal or vertical lines without typing coordinates.
Toggle with F8 or through Settings → Tracking.
Polar Tracking
Polar tracking constrains the cursor to snap to lines at specific angular increments from the previous point. When the cursor is close to a tracked angle a coloured tracking line is displayed and the cursor snaps to that direction.
The angular increment is configured in Settings → Tracking → Polar Angle. Available increments are 5°, 10°, 15°, 22.5°, 30°, 45°, and 90°.
For example, with a 30° polar angle set, the cursor will snap to 0°, 30°, 60°, 90°, 120°, 150°, 180°, and so on.
Toggle with F10 or through Settings → Tracking.
Note
Ortho mode and polar tracking are mutually exclusive — enabling one disables the other.