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16.4.1 Pen and RawPen Objects

`Pen` and `RawPen` objects have all the global functions described above, except for `demo()` as methods, which manipulate the given pen.

The only method which is more powerful as a method is `degrees()`.

`degrees`([fullcircle])
  fullcircle is by default 360. This can cause the pen to have any angular units whatever: give fullcircle 2* for radians, or 400 for gradians.