[Tkinter-discuss] Python 3.1; canvas rectangle dash & dashoffset
Lion Kimbro
lionkimbro at gmail.com
Mon Sep 28 00:38:18 CEST 2009
Dear tkinter peoples,
I'm having difficulties with dash, and dashoffset;
Can anyone identify what I'm doing wrong?
- Code: ----------------------------------------------------
import tkinter
def move_dashes(canvas, rect, offset):
print("move_dashes(%s, %s, %s)" % (canvas, rect, offset))
canvas.itemconfigure(rect, dashoffset=offset)
canvas.after(1000, move_dashes, canvas, rect, offset+1)
def dashoffset_test():
# Create a canvas
canvas = tkinter.Canvas()
canvas.pack()
# Put a comparison rectangle on the canvas.
canvas.create_rectangle(7, 2, 27,28, outline="blue", dash=(5,1))
# Put a rectangle on the canvas with a moving dash pattern.
rect = canvas.create_rectangle(10,5, 30,30, dash=(4,1))
canvas.after(1000, move_dashes, canvas, rect, 1)
canvas.mainloop()
dashoffset_test()
============================================================
Two questions:
1. Why are the dash patterns so wildly different?
canvas.create_rectangle(7, 2, 27,28, outline="blue", dash=(5,1))
canvas.create_rectangle(10,5, 30,30, dash=(4,1))
The first looks like:
xxxxxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxxxxx
The second looks like:
xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx
...and yet, it's just (5,1) vs. (4,1)
This is not what I expect from:
http://infohost.nmt.edu/tcc/help/pubs/tkinter/dash-patterns.html
2. Why doesn't the dash pattern move?
The call to canvas.itemconfigure(rect, dashoffset=offset)
looks correct; Am I doing it wrong?
I am using Python 3.1
Thank you,
Lion Kimbro
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