Tkinter problem making 30 degree angle multiple times

November 15, 2021

I have a problem https://prnt.sc/1znuffv with tkinter, I need it to reach from 0 to 180 degrees with making "checkpoint" every 30 degrees, I got help on this site to successfully done to reach 0-180 and back but cannot make it 30 by 30.

import tkinter as tk
root = tk.Tk()
root.geometry("800x800")
root.resizable(0, 0)

s = 0
def menjajKanvas(arc):
global s
if s < 180:
    s+=1
    c.itemconfig(arc,extent=s,fill="red")
    root.after(10,menjajKanvas,arc)
else:
    shrink_arc(arc)
def shrink_arc(arc):
global s
if s >= 0:
    s-=1
    c.itemconfig(arc,extent=s,fill="red")
    root.after(10,shrink_arc,arc)
else:
    root.after(10,menjajKanvas,arc)

c = tk.Canvas(root, height=250, width=300, bg="blue")
c.pack()
arc = c.create_arc(10,50,240,210,
               extent=150,
               outline="red",
               fill='red',
               tags=("arc",))
menjajKanvas(arc)
root.mainloop()

>Solution :

You could use a variable delay in your function calls issued via tk.after:

something like this:

import tkinter as tk


def menjajKanvas(arc):
    global s
    if s < 180:
        s += 1
        c.itemconfig(arc,extent=s,fill="red")
        delay = 10 if s % 30 else 1000
        root.after(delay, menjajKanvas, arc)
    else:
        root.after(1000, shrink_arc(arc))


def shrink_arc(arc):
    global s
    if s >= 0:
        s -= 1
        c.itemconfig(arc,extent=s,fill="red")
        delay = 10 if s % 30 else 1000
        root.after(delay, shrink_arc, arc)
    else:
        root.after(1000, menjajKanvas(arc))


if __name__ == '__main__':

    root = tk.Tk()
    root.geometry("800x800")
    root.resizable(0, 0)

    s = 0

    c = tk.Canvas(root, height=250, width=300, bg="blue")
    c.pack()
    
    arc = c.create_arc(
        10, 50, 240, 210,
        extent=150,
        outline="red",
        fill='red',
        tags=("arc",))
    
    menjajKanvas(arc)
    
    root.mainloop()