PacmanΒΆ

```"""Pacman, classic arcade game.

Exercises

1. Change the board.
2. Change the number of ghosts.
3. Change where pacman starts.
4. Make the ghosts faster/slower.
5. Make the ghosts smarter.
"""

from random import choice
from turtle import *

from freegames import floor, vector

state = {'score': 0}
path = Turtle(visible=False)
writer = Turtle(visible=False)
aim = vector(5, 0)
pacman = vector(-40, -80)
ghosts = [
[vector(-180, 160), vector(5, 0)],
[vector(-180, -160), vector(0, 5)],
[vector(100, 160), vector(0, -5)],
[vector(100, -160), vector(-5, 0)],
]
# fmt: off
tiles = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0,
0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0,
0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
0, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0,
0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0,
0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0,
0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0,
0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
]
# fmt: on

def square(x, y):
"""Draw square using path at (x, y)."""
path.up()
path.goto(x, y)
path.down()
path.begin_fill()

for count in range(4):
path.forward(20)
path.left(90)

path.end_fill()

def offset(point):
"""Return offset of point in tiles."""
x = (floor(point.x, 20) + 200) / 20
y = (180 - floor(point.y, 20)) / 20
index = int(x + y * 20)
return index

def valid(point):
"""Return True if point is valid in tiles."""
index = offset(point)

if tiles[index] == 0:
return False

index = offset(point + 19)

if tiles[index] == 0:
return False

return point.x % 20 == 0 or point.y % 20 == 0

def world():
"""Draw world using path."""
bgcolor('black')
path.color('blue')

for index in range(len(tiles)):
tile = tiles[index]

if tile > 0:
x = (index % 20) * 20 - 200
y = 180 - (index // 20) * 20
square(x, y)

if tile == 1:
path.up()
path.goto(x + 10, y + 10)
path.dot(2, 'white')

def move():
"""Move pacman and all ghosts."""
writer.undo()
writer.write(state['score'])

clear()

if valid(pacman + aim):
pacman.move(aim)

index = offset(pacman)

if tiles[index] == 1:
tiles[index] = 2
state['score'] += 1
x = (index % 20) * 20 - 200
y = 180 - (index // 20) * 20
square(x, y)

up()
goto(pacman.x + 10, pacman.y + 10)
dot(20, 'yellow')

for point, course in ghosts:
if valid(point + course):
point.move(course)
else:
options = [
vector(5, 0),
vector(-5, 0),
vector(0, 5),
vector(0, -5),
]
plan = choice(options)
course.x = plan.x
course.y = plan.y

up()
goto(point.x + 10, point.y + 10)
dot(20, 'red')

update()

for point, course in ghosts:
if abs(pacman - point) < 20:
return

ontimer(move, 100)

def change(x, y):
"""Change pacman aim if valid."""
if valid(pacman + vector(x, y)):
aim.x = x
aim.y = y

setup(420, 420, 370, 0)
hideturtle()
tracer(False)
writer.goto(160, 160)
writer.color('white')
writer.write(state['score'])
listen()
onkey(lambda: change(5, 0), 'Right')
onkey(lambda: change(-5, 0), 'Left')
onkey(lambda: change(0, 5), 'Up')
onkey(lambda: change(0, -5), 'Down')
world()
move()
done()
```