The two circular handles with the cross-lines help you in measuring distances between points. By aligning the cross-lines with the start and end edges of a screen-element you can measure its length.
For fine-tuning the alingment of the handles with the screen-element you can use keyboard shortcuts.
Arrow keys: Move the start handle (larger circle) by 1pt
Arrow keys: Move the end handle (smaller circle) by 1pt
You can also hold the
Shift key to move by 10pts.
The rotation handle (handle without cross-line) is useful when measuring angles.
The angles are always between 0˚ and 180˚.
Tip If you hold the
Shift key while dragging any of the handles, it will snap to 15˚ increments.