Displaying in Tkinter/python

Question

I'm trying to display the distance between my two circles in the Tkinter window. I found an algorithm, but I'm having problem with displaying it. Here's my program so far:

from Tkinter import *
from math import *

def planetM(gd, hb):
    global x1, y1
    x1, y1 = x1+gd, y1+hb
    can1.coords(oval1,x1, y1, x1+30, y1+30)

def planetU(gd, hd):
    global z1, v1
    z1, v1 = z1+gd, v1+hd
    can1.coords(oval2, z1, v1, z1+30, v1+30)

def move_M_up():
    planetM(0, -10)
def move_U_up():
    planetU(0, -10)
def move_M_down():
    planetM(0, 10)
def move_U_down():
    planetU(0, 10)
def move_M_right():
    planetM(10, 0)
def move_U_right():
    planetU(10, 0)
def move_M_left():
    planetM(-10, 0)
def move_U_left():
    planetU(-10, 0)

def distance():
    dist = math.sqrt((x1-z1)**2 + (y1-v1)**2) -  30
    chain.configure(text='dist :' + str(dist))

x1, y1, z1, v1 = 10, 10, 260, 260

win1 = Tk()
win1.title("Two planets")

can1 = Canvas(win1, bg='black', height = 300, width=300)
oval1= can1.create_oval(x1,y1,x1+30,y1+30, width=2, fill='orange')
oval2= can1.create_oval(z1,v1,z1+30,v1+30, width=2, fill='blue')
can1.grid(row=1, column =1, rowspan = 9)
Button(win1, text='Exit', command= win1.quit).grid(row=1, column =2)
Button(win1, text='M left', command=move_M_left).grid(row=2, column=2)
Button(win1, text='M right', command=move_M_right).grid(row=3, column=2)
Button(win1, text='M down', command=move_M_down).grid(row=4, column=2)
Button(win1, text='M up', command=move_M_up).grid(row=5, column=2)
Button(win1, text='U left', command=move_U_left).grid(row=6, column=2)
Button(win1, text='U right', command=move_U_right).grid(row=7, column=2)
Button(win1, text='U down', command=move_U_down).grid(row=8, column=2)
Button(win1, text='U up', command=move_U_up).grid(row=9, column=2)
chain = Label(win1)
chain.grid(row = 10, column=1)

win1.mainloop()

I tried .bind but I couldn't find anything that constantly displays a number and changes it as the circles move around.

Don't use wildcard imports.

Perry
– Perry

2016-06-03 18:55:22 +00:00
Commented Jun 3, 2016 at 18:55 — Perry
– Perry, Commented Jun 3, 2016 at 18:55

Stevo Mitric · Accepted Answer · 2016-06-03 19:53:54Z

1

Use after method. Make it refresh the label every 0.1 seconds.

win1.after(100, distance)    # Number 100 represents time in milliseconds to wait before function distance is called
                             # This needs to be placed BEFORE mainloop.

Then make function distance call itself with same method:

def distance():
    dist = math.sqrt((x1-z1)**2 + (y1-v1)**2) -  30
    chain.configure(text='dist :' + str(dist))
    win1.after(100, distance)

NOTE: If you are importing from math like this: from math import * then you can't say: math.sqrt(). So either change the import to: import math or remove math.

answered Jun 3, 2016 at 19:53

Stevo Mitric

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