from math import *
from tkinter import *
def f(x):
	if x >= 0 and x < 0.1:
		x = 0.1
	if x <= 0 and x >= -0.1:
		x = -0.1
	return(2*x+2)

root=Tk()
root.geometry("1200x1200")
W = 1000
H = 1000
canvas=Canvas(root, width=W, height=H,bg="grey")
canvas.create_line(W/2, 0, W/2, H, width=0.5)
canvas.create_line(0, H/2, W, H/2, width=0.5)
minx = -10
maxx = 10

funcy = [0] * W

for i in range(W):
	x = minx + (maxx - minx) / W * i
	funcy[i] = f(x)

maxy = max(funcy)

for i in range(W - 1):
	y1 = funcy[i] / maxy * H / 10
	y2 = funcy[i + 1] / maxy * H / 10
	if abs(y1 - y2) < 150:
		#canvas.create_line(i,H/2 - y1,i + 1, H/2 - y2,fill="red", width=1)
		canvas.create_oval(i,H/2-y1,i+5,H/2-y2)
canvas.pack()
root.mainloop()