CIGAL Reference Manual, Chapter 2 (Commands): PIN
usage: pin varbptr x y z
PIN specifies which point is to remain fixed during a vector rotation or scaling operation. It acts as like you had stuck a pin at that position and then rotated and/or scaled everything else around that point. VARBPTR is the data variable you wish to PIN. For example,
pin vecs 0 0 0 ; pin variable VECS at the origin
See Also:
OFFSET(2),
POINTER(3),
REDRAW(2),
ROTATE(2),
SCALE(2),
TRANSFORM(3)