'qlin' RETURN 'w'|'b'|'c'|'m'|'s'|'l'|'q'|'u'This keyword is used to define a sequence of lines (or just one, see also line). To start a sequence of lines move the mouse pointer over a point and press the key ``b'' (begin).
To define just a straight line go to the end point and press ``l'' (line). This point is also the starting point for the next line.
If the line is a sequential line (spline) then the points of the sequence must be defined with the key ``s'' in the correct order, but the last point must be selected with the key ``l''.
If the line is an arc then the center point must be selected with the ``c'' key or one point on the line between the end-points must be selected with the ``m'' key, but the last point must be selected with the key ``l''.
Press ``q'' to quit the command or ``u'' to undo the last action.
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.