> I'm having trouble with this small example program: > > http://en.literateprograms.org/Bresenham%27s_line_algorithm_%28Python%29 > > When I run it, I only get a blank grey window. I'm running Python 2.6 under > Windows XP. > > If there's a problem with the code, I can't see it... it seems like it should > work. Can anyone else try this and see if it works for them?
It appears that Tkinter (or probably the underling tcl/tk) is smart: if you create a line with the same start and end points, it won't draw a line. Try it: create_line(10, 100, 10, 100, fill='red') won't work. > If I stick this line in before the loop, it does draw a red line, so I know > my copy of Python/Tkinter is working: > canvas.create_line(10, 100, 5, 50 , fill='red') _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor