# Tic Tac ToeΒΆ

A paper-and-pencil game for two players.

```"""Tic Tac Toe

Exercises

1. Give the X and O a different color and width.
2. What happens when someone taps a taken spot?
3. How would you detect when someone has won?
4. How could you create a computer player?

"""

from turtle import *

from freegames import line

def grid():
"Draw tic-tac-toe grid."
line(-67, 200, -67, -200)
line(67, 200, 67, -200)
line(-200, -67, 200, -67)
line(-200, 67, 200, 67)

def drawx(x, y):
"Draw X player."
line(x, y, x + 133, y + 133)
line(x, y + 133, x + 133, y)

def drawo(x, y):
"Draw O player."
up()
goto(x + 67, y + 5)
down()
circle(62)

def floor(value):
"Round value down to grid with square size 133."
return ((value + 200) // 133) * 133 - 200

state = {'player': 0}
players = [drawx, drawo]

def tap(x, y):
"Draw X or O in tapped square."
x = floor(x)
y = floor(y)
player = state['player']
draw = players[player]
draw(x, y)
update()
state['player'] = not player

setup(420, 420, 370, 0)
hideturtle()
tracer(False)
grid()
update()
onscreenclick(tap)
done()
```