Translate objects by vector, a world coordinate distance
in the form ‘(x . y)’. Returns a list of the modified
objects.
— Function: rotate-objects! center angle [objects...]
Translate objects anti-clockwise by angle about
center, a world coordinate position in the form ‘(x . y)’.
angle must be an integer multiple of 90 degrees. Returns a list
of the modified objects.
— Function: mirror-objects! x-offset [objects...]
Mirror objects in the line ‘x = x-offset’. Returns a
list of the modified objects.