On 11/8/2014 11:35 AM, Akira Li wrote:
"ast" <nom...@invalid.com> writes:
Ok, thx, it works now with:
import tkinter
fen = tkinter.Tk()
x=0
def moveW():
global x
fen.geometry("200x200+%d+10" % x)
x = x + 10
if (x < 1200):
fen.after(50, moveW)
moveW()
In general, to avoid the start time "drift" [1],
which is hardly noticeable
you could lock the
execution with a timer e.g., to move the window from left to right
*delta_x* pixels at a time every *period* ms [2]:
On my Win7 machine, your complicated code is much worse as it causes the
window to jump about every half second
#!/usr/bin/env python3
from time import monotonic
from tkinter import Tk
def timer():
return int(monotonic() * 1000) # milliseconds
def call_repeatedly(period, function, *args):
root.after(period - timer() % period, call_repeatedly, period,
The '- timer() % period' 'correction' is wrong when not 0 as it causes
jumps.
function, *args) # schedule the next call
function(*args)
def move(delta_x, max_x, width=200, x=[0]):
root.geometry("%dx50+%d+100" % (width, x[0]))
x[0] += delta_x # poor man's object
if x[0] > (max_x - width):
root.destroy() # exit
root = Tk()
period = 20 # call every *period* milliseconds
delta_x = 2 # how many pixels to move at a time
root.after(period - period % timer(), call_repeatedly, period,
'period % timer()' is nonsensical as timer() is arbitrary. It will
typically be 0 anyway. 'after(0, ...)' works fine.
move, delta_x, root.winfo_screenwidth())
root.mainloop()
[1]:
http://stackoverflow.com/questions/8600161/executing-periodic-actions-in-python#comment26637231_8600301
[2]:
http://stackoverflow.com/questions/24174924/how-to-run-a-function-periodically-in-python
Akira
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Terry Jan Reedy
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