2 bolygó

#coding: utf-8
from tkinter import *
from functools import partial

def mozog_a(gd,hb):
    global x1,y1
    x1,y1=x1+gd,y1+hb
    meret_a= eval(mezo2.get())
    can1.coords(ovall,x1,y1,x1+meret_a,y1+meret_a)

def mozog_b(gd,hb):
    global x2,y2
    x2,y2=x2+gd,y2+hb
    meret_b= eval(mezo3.get())
    can1.coords(oval2,x2,y2,x2+meret_b,y2+meret_b)

def kozep_a():
    kozepx1=x1+25
    kozepy1=y1+25
    return "Helyzet: X= ",kozepx1," Y= ",kozepy1

def kozep_b():
    kozepx2=x2+15
    kozepy2=y2+15

def mozdit(irany,melyik):
    mertek= eval(mezo1.get())
    if melyik=="a":
        if irany=="balra":
            mozog_a(0-mertek,0)
        elif irany=="jobbra":
            mozog_a(mertek,0)
        elif irany=="fel":
            mozog_a(0,0-mertek)
        elif irany=="le":
            mozog_a(0,mertek)
        kozep_a()
    elif melyik=="b":
        if irany=="balra":
            mozog_b(-mertek,0)
        elif irany=="jobbra":
            mozog_b(mertek,0)
        elif irany=="fel":
            mozog_b(0,-mertek)
        elif irany=="le":
            mozog_b(0,mertek)

x1,y1,x2,y2=10,10,100,100
meret_a,meret_b=10,30
abl1=Tk()
abl1.title("2 bolygó közti gravitációs erő kiszámolása")

can1=Canvas(abl1,bg="white",height=300,width=300)
ovall=can1.create_oval(x1,y1,x1+50,y1+50,width=2,fill="red")
oval2=can1.create_oval(x2,y2,x2+30,y2+30,width=2,fill="blue")
can1.grid(row=0,column=4,rowspan=10)
mezo1=Entry(abl1)
mezo1["width"]=10
Label(abl1,text="Lépés mértéke:").grid(row=0,column=1,padx=4,columnspan=3)
mezo1.grid(row=1,column=1,padx=4,columnspan=3)
mezo1.insert(0,10)
global mertek,tavolsag,kozepx1,kozepx2,kozepy1,kozepy2
Button(abl1,text="Kilép",command=abl1.quit).grid(row=9,column=2)
Button(abl1,text="<",command=partial(mozdit,"balra","a")).grid(row=3,column=1,sticky=E,padx=4)
Button(abl1,text=">",command=partial(mozdit,"jobbra","a")).grid(row=3,column=3,sticky=W)
Button(abl1,text="^",command=partial(mozdit,"fel","a")).grid(row=2,column=2,sticky=S)
Button(abl1,text="ˇ",command=partial(mozdit,"le","a")).grid(row=4,column=2,sticky=N)
Button(abl1,text="<",command=partial(mozdit,"balra","b")).grid(row=6,column=1,sticky=E,padx=4)
Button(abl1,text=">",command=partial(mozdit,"jobbra","b")).grid(row=6,column=3,sticky=W)
Button(abl1,text="^",command=partial(mozdit,"fel","b")).grid(row=5,column=2,sticky=S)
Button(abl1,text="ˇ",command=partial(mozdit,"le","b")).grid(row=7,column=2,sticky=N)
Label(abl1,text="1. bolygó (piros) mérete: ").grid(row=6,column=7)
mezo2=Entry(abl1)
mezo2.grid(row=6,column=8)
mezo2.insert(0,50)
mezo3=Entry(abl1)
Label(abl1,text="2. bolygó (kék) mérete: ").grid(row=7,column=7)
mezo3.grid(row=7,column=8)
mezo3.insert(0,30)
Label(abl1,text=kozep_a()).grid(row=8,column=7)

abl1.mainloop()