Rotation in the plane

See Section 27.12.4 for rotations in space.

The rotation command creates a rotation.

rotation takes two mandatory arguments and one optional argument:
- P, a point (the center of rotation).
- θ, the angle of rotation.
- Optionally, G, a geometric object.
rotation(P,θ) returns a new command which rotations about P through an angle of θ.
reflection(P,θ,G) returns and draws the rotation of G about P through an angle of θ.

r:=rotation(i,-pi/3); r(square(0,1)

or:

rotation(i,-pi/3,square(0,1))

rotation(i,-pi/2,line(1+i,-1))