import tkinter
import random
canvas = tkinter.Canvas(height=500,width=500)
canvas.pack()

pocet_bodov=0
x=random.randrange(500)
y=20
a=0
b=490
lop_x=random.randrange(500)
lop_y=20
def kresli_lopticku(x, y):
    canvas.create_oval(x-10,y-10,x+10,y+10,fill='red')


def kresli_kurzor(a, b):
    canvas.create_line(a,b,a+70,b,fill='blue',width=10)


def vypis_body(pocet_bodov):
    canvas.create_text(100,10,text='pocet bodov')
    canvas.create_text(200,10,text=pocet_bodov)


def timer1():
    global lop_x,lop_y,a,b
    canvas.delete('all')
    lop_x=lop_x
    lop_y=lop_y+7
    kresli_lopticku(lop_x, lop_y)
    kresli_kurzor(a, b)
    if lop_y>480:
        lop_y=20
        lop_x=random.randrange(500)


    canvas.after(10, timer1)


def posun(klaves):
    global a,b,lop_x,lop_y
    if klaves.keysym=='Left':
        a=a-10
    if klaves.keysym=='Right':
        a=a+10
    canvas.delete('all')
    kresli_lopticku(lop_x,lop_y)
    kresli_kurzor(a,b)
    vypis_body(pocet_bodov)





timer1()
canvas.bind_all('<Left>', posun)
canvas.bind_all('<Right>', posun)