Refering to Bug 1051589 in the tcl section:
canvas -dashoffset option dosen't work on windows
The general canvas option "-dashoffset" has no
influence in windows releases. Please test the attached
script (improved for windows test).
You will see moving dashes on Linux OS but static ones
on windows. I already tested all current releases, it
doesnt work.
cheers,
konrad.lustig@gmx.de
improved test script for -dashoffset bug
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This is a limitation of the Windows version of Tk. On Windows, only certain dash patterns and no dash offsets are supported. Refer to Tk_GetDash man page (which could be amended to clarify that dash offsets are also not supported under Windows).
Using ExtCreatePen, maybe some current liminations can be handled now. See:
<http://msdn.microsoft.com/en-us/library/windows/desktop/dd162705%28v=vs.85%29.aspx>