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qlin

       'qlin' <name>(optional) RETURN 'w'|'b'|'c'|'m'|'s'|'t'|'g'|'l'|'u'

This keyword is used to define a sequence of lines (or just one, see also line). The user might specify a name in the command-line or by picking an existing line with the key ``l''. 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 ``g'' (generate). This point is also the starting point for the next line. So no ``b'' is necessary for the next line.

If the line is a sequential line (spline) then the points of the sequence must be defined with the key ``t'' in the correct order, but the last point must be selected with the key ``g''.

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 ``g''.

In case you need to split a line during the process, you can do that by pressing the ``s'' key.

When you want to modify the length then pick an existing line with the key ``l'' and then the endpoint you want to move. The displacement is requested and the point is moved in the direction of the line by the specified displacement.

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.

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