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#### 2.2.1.2 Object transformations

Objects can be translated, rotated, or mirrored about a point.

Function: translate-objects! vector [objects...]

  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.