MASK ADD

        [ADVANCED\]MASK ADD Shape [Arguments ...]

      Add the specified Shape to the current mask.  Shape can be
      CIRCLE      Ox Oy Diameter
      ELLIPSE     Ox Oy Major Minor Angle
      RECTANGLE   Ox Oy Major Minor Angle
      POLYGON     File
    where Ox Oy are the center of the shapes,  Major and Minor the  axes  length
    (=  side  lengths  for the Rectangle...) and Angle the Position Angle of the
    Major axis.

    For the POLYGON, the cursor is called if no File argument is given; else the
    polygon is read from the specified File.