'qcnt' RETURN 'w'|'n'|'p'This keyword is used to define a new center-point or -node by pressing ``n'' or ``p'' when the mouse pointer is at the position of a node or a point.
It is also possible to measure distances between two pixels on the screen. Just press the key ``w'' on the positions of the two pixels. The distance is calculated in the scale of the displayed geometry.