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line

       'line' <name(char<9)>|'!' <p1> <p2> <cp|seq> <div>

This keyword is used to define or redefine a line. A line depends on points. A line can only be defined if the necessary points are already defined. There are three different types of lines available. The straight line
line l1 p1 p2 4
is defined by its name l1, the name could have up to 8 characters, by the points p1 and p2 and optionally by the division. The arc
line `!` p1 p2 cp 4
needs in addition a center point cp. The radius changes linear from p1 to p2 if the center-point cp is excentric. The name is chosen automatically (triggered by the character `!`). The spline
line l1 p1 p2 seq 4
needs in addition a so called sequential-set seq (use the command seqa to define such a set). This set seq stores the spline points between the end-points in the right order. The spline function is described in [14]. Usually a line would be defined interactively. This would be done with the command qlin.