CIGAL Reference Manual, Chapter 2 (Commands): PIN

PIN -- Set the stationary point for rotation or scaling

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)

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