|
| 1 | +from turtle import * |
| 2 | +import turtle |
| 3 | +from random import randrange |
| 4 | +from freegames import square, vector |
| 5 | + |
| 6 | +turtle.bgcolor("black") |
| 7 | +food = vector(0, 0) |
| 8 | +snake = [vector(10, 0)] |
| 9 | +aim = vector(0, -10) |
| 10 | + |
| 11 | +def change(x, y): |
| 12 | + "Change snake direction." |
| 13 | + aim.x = x |
| 14 | + aim.y = y |
| 15 | + |
| 16 | +def inside(head): |
| 17 | + "Return True if head inside boundaries." |
| 18 | + return -250 < head.x < 230 and -250 < head.y < 230 |
| 19 | + |
| 20 | +def move(): |
| 21 | + "Move snake forward one segment." |
| 22 | + head = snake[-1].copy() |
| 23 | + head.move(aim) |
| 24 | + |
| 25 | + if not inside(head) or head in snake: |
| 26 | + square(head.x, head.y, 9, 'red') |
| 27 | + update() |
| 28 | + return |
| 29 | + |
| 30 | + snake.append(head) |
| 31 | + |
| 32 | + if head == food: |
| 33 | + print('Snake:', len(snake)) |
| 34 | + food.x = randrange(-15, 15) * 10 |
| 35 | + food.y = randrange(-15, 15) * 10 |
| 36 | + else: |
| 37 | + snake.pop(0) |
| 38 | + |
| 39 | + clear() |
| 40 | + |
| 41 | + for body in snake: |
| 42 | + square(body.x, body.y, 9, 'green') |
| 43 | + |
| 44 | + square(food.x, food.y, 9, 'red') |
| 45 | + update() |
| 46 | + ontimer(move, 100) |
| 47 | + |
| 48 | + |
| 49 | +hideturtle() |
| 50 | +tracer(False) |
| 51 | +listen() |
| 52 | +onkey(lambda: change(10, 0), 'Right') |
| 53 | +onkey(lambda: change(-10, 0), 'Left') |
| 54 | +onkey(lambda: change(0, 10), 'Up') |
| 55 | +onkey(lambda: change(0, -10), 'Down') |
| 56 | +move() |
| 57 | +done() |
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