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  Arguments
 
    x, y    Integers specifying vector
 
  Description
 
    The values of x and y define the vector which determines the
    direction of rotation of font text on the screen. Some examples of
    text rotation options are:
 
      (x, y)    Text Orientation
      ══════    ════════════════════════════════════
      ( 1,0)    Horizontal text (default)
      ( 0,1)    Rotated 90 degrees counterclockwise
      (-1,0)    Rotated 180 degrees
      (0,-1)    Rotated 270 degrees counterclockwise
 
    Note that (0,0) is ignored. If other values are input, only
    the sign of the input is used. For example, (-3,0) is interpreted
    as (-1,0).