Kevin added the comment: This problem appears to go deeper than Python. On the TK bug tracker, under the issue "-dashofset option doesnt work on ms windows build" (https://core.tcl.tk/tk/tktview?name=1055974fff), a commenter mentions:
> On Windows, only certain dash patterns and no dash offsets are supported. Which implies that you can't create segments and gaps of arbitrary length ratios- you can only select from a limited collection of premade patterns. This comment from tkWinDraw.c (https://github.com/tcltk/tk/blob/master/win/tkWinDraw.c#L1188) supports this: > Below is a simple translation of serveral dash patterns to valid windows > pen types. Far from complete, but I don't know how to do it better. The code goes on to invoke CreatePen (https://msdn.microsoft.com/en-us/library/windows/desktop/dd183509%28v=vs.85%29.aspx), which only allows for four different variations of dashed line styles. Conclusions: 1) It isn't Python's fault. 2) The guy who wrote the Tk code was aware of the limitation at the time, so it's arguably not a bug. So, this issue ought to be closed; not much we can do, except perhaps petition the popular Tkinter reference websites to put up a warning label on their descriptions of the `dash` keyword argument. ---------- resolution: -> not a bug status: open -> closed _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27058> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
