New submission from Kevin:
When creating a dashed line using `Canvas.create_line`. Minimal reproducing
example:
from Tkinter import *
root = Tk()
canvas = Canvas(root, width=100, height=30, bg="black")
canvas.pack()
canvas.create_line((0,10,100,10), dash=(20,), fill="red")
canvas.create_line((0,20,100,20), dash=(20,20), fill="green")
root.mainloop()
Expected result: each line segment should be 20 pixels wide, separated by gaps
20 pixels wide.
Actual result: each line segment is 18 pixels wide, separated by gaps 6 pixels
wide. See attached file for screenshot.
Additional information: this problem appears to only occur on Windows. The
Stack Overflow Python chat room attempted to replicate this issue, starting
around here:
http://chat.stackoverflow.com/transcript/message/30645798#30645798. Users of
Windows 7, 8, and 10 were able to replicate the incorrect segmenting behavior.
Users of Linux had correct segment lengths. (some Windows & 2.7 users also
noticed that their green line was 3 pixel segments with 3 pixel gaps, but this
seems to be an independent bug which was already fixed somewhere between 2.7.2
and 2.7.10.)
----------
components: Tkinter, Windows
files: output.PNG
messages: 265868
nosy: kms70847, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Tkinter's canvas' dashed lines have incorrect segment lengths
versions: Python 2.7, Python 3.5
Added file: http://bugs.python.org/file42901/output.PNG
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27058>
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