I want to a create a moving label-CodePudding

import tkinter as tk
from tkinter import *
import keyboard
import time

a = 120
root = tk.Tk()
root.state('zoomed')
root.configure(bg='white')
root.resizable(False, False)
a = 30
x = 0


def increase():
    global a
    a  = 10


def ar():
    for i in range(50):
        labele1.place(x=120, y=a)
        root.after(1000, increase)


c1 = Canvas(root, width=700, height=700, bg='gray95')
c1.place(x=450, y=60)
labele1 = tk.Label(c1, text='_______', font='Calibri 20')
startbutton = tk.Button(text='Başla', command=ar)
startbutton.pack()

root.mainloop()

I want to create a moving label which moves per second. Everything looks clear but it doesn't work well. I want to make a car race app but first the walls should move back and it exit the project

CodePudding user response：

The idea to use root.after is correct, but the implementation is wrong. Just because you update the value of a inside a function, tkinter will not automatically update that value with its widget unless you manually ask it to. So what you can do is:

Make the label a canvas object (recommended since you will be making a game and canvas is closer to give you tools you need):

def ar():
    global a
    a  = 10 # Increase the value of a

    c1.coords('wall', [120, a]) # Change the coord of the tag 'wall'
    root.after(25, ar) # Repeat this function every 25 ms

....

labele1 = tk.Label(c1, text='_______', font='Calibri 20')
c1.create_window(120, a, window=labele1, tags='wall') # Initial coords -> x=120, y=30

Change the location of the label using place_configure:

def ar():
    global a
    a  = 10 # Increase the value of a

    labele1.place_configure(y=a)
    root.after(25, ar) # Repeat this function every 25 ms

....

labele1 = tk.Label(c1, text='_______', font='Calibri 20')
labele1.place(x=120, y=a)

CodePudding user response：

Plus checking frame size and decreasing functions. the main problem was a minor bug which you should change in line 37.

import tkinter as tk
from tkinter import *
import keyboard
import time

a = 120
root = tk.Tk()
root.state('zoomed')
root.configure(bg='white')
root.resizable(False, False)
a = 30
x = 0

moving_rate = 10
max_y = 600
min_y = 30

flag_mov_func= 1
def moving_func(): #increase or decrease function
    global a
    global flag_mov_func

    if flag_mov_func :
        a  = moving_rate
        if  a   moving_rate == max_y: #simple logic bouncing if it ends
            flag_mov_func=0
    elif flag_mov_func==0 :
        a -= moving_rate
        if  a - moving_rate == min_y:
            flag_mov_func=1
def ar():

    moving_func() 
    labele1.place(x=120, y=a) 
    root.after(1000, ar)

flag_is_called=1
def button1(): #new update on code to make the button work once.
    global  flag_is_called
    if flag_is_called:
        flag_is_called=0
        ar()

c1 = Canvas(root, width=700, height=700, bg='gray95')
c1.place(x=450, y=60)
labele1 = tk.Label(c1, text='_______', font='Calibri 20')
startbutton = tk.Button(text='Başla', command=button1)
startbutton.pack()

root.mainloop()