**Command: **conLine

**Description:**
Constructs a line and shows the line parameters. The command refers to
the fundamental line processor that is used whenever a line is to be
constructed. The line can be constrained to orthogonal mode only. The
supported construction methods are
*Pick:* The line is constructed by picking an existing
line.

*2 Points:* The line is constructed from two
points P1 and
P2.

*Point and vector:* The line is constructed from a
point P and a
vector v.

*Point and circle:* The line is constructed from a
point P
tangential to a circle
c. One of the up to two possible lines must
be identified by picking.

*2 circles:* The line is constructed tangential to two
circles c1 and
c2. One of the up to four possible lines
must be identified by picking.