我正在用 Python 开发著名的贪吃蛇游戏，偶然发现了一个小故障，蛇在吃食物时会开始做一些事情。
蛇在整个游戏过程中应保持恒定速度，并且各节之间的距离应相等。但实际情况是，每次蛇吃食物时，它的速度都会加快，各节之间的距离就会开始变远。
如果有人能帮忙的话，这里是部分代码。
import random
import time
from turtle import Screen, Turtle
MOVE_DISTANCE = 10
POSITIONS = [(0, 0), (0, -20), (0, -40)]
class Snake:
def __init__(self):
self.segments = []
self.create_snake()
self.head = self.segments[0]
def create_snake(self):
for position in POSITIONS:
self.add_segment(position)
def add_segment(self, position):
new_segment = Turtle("square")
new_segment.color("white")
new_segment.penup()
new_segment.goto(position)
self.segments.append(new_segment)
def move(self):
for seg_num in range(len(self.segments) - 1, 0, -1):
self.head.forward(MOVE_DISTANCE) # Moving distance of head
new_x = self.segments[seg_num - 1].xcor()
new_y = self.segments[seg_num - 1].ycor()
self.segments[seg_num].goto(new_x, new_y)
def grow(self):
self.add_segment(self.segments[-1].position())
def up(self):
if self.head.heading() != 270:
self.head.setheading(90)
def down(self):
if self.head.heading() != 90:
self.head.setheading(270)
def left(self):
if self.head.heading() != 0:
self.head.setheading(180)
def right(self):
if self.head.heading() != 180:
self.head.setheading(0)
class Food(Turtle):
def __init__(self):
super().__init__()
self.shape("circle")
self.penup()
self.shapesize(stretch_len=0.5, stretch_wid=0.5)
self.color("red")
self.speed("fastest")
self.refresh_food()
def refresh_food(self):
rand_x_cor = random.randint(-480, 480)
rand_y_cor = random.randint(-260, 260)
self.goto(rand_x_cor, rand_y_cor)
my_screen = Screen()
my_screen.setup(width=1000, height=600)
my_screen.bgcolor("black")
my_screen.title("My Snake Game")
my_screen.tracer(0)
my_snake = Snake()
food = Food()
my_screen.listen()
my_screen.onkey(my_snake.up, "Up")
my_screen.onkey(my_snake.down, "Down")
my_screen.onkey(my_snake.left, "Left")
my_screen.onkey(my_snake.right, "Right")
game_over = False
while not game_over:
my_screen.update()
time.sleep(0.1)
my_snake.move()
# Detect collision with the food
if my_snake.head.distance(food) < 15:
food.refresh_food()
my_snake.grow()
# Detect collision with wall
if my_snake.head.xcor() < -480 or my_snake.head.xcor() > 480 or my_snake.head.ycor() < -280 or my_snake.head.ycor() > 280:
game_over = True
# Detect collision with tail
for segment in my_snake.segments[2:]:
if my_snake.head.distance(segment) < 10:
game_over = True
我尝试减少蛇头的移动距离
self.head.forward(MOVE_DISTANCE) # Moving distance of head
我也尝试了不同的方法来移动蛇，但是也没有效果。
2
最佳答案
1
该move方法看起来不正确：
def move(self):
for seg_num in range(len(self.segments) - 1, 0, -1):
self.head.forward(MOVE_DISTANCE) # Moving distance of head
new_x = self.segments[seg_num - 1].xcor()
new_y = self.segments[seg_num - 1].ycor()
self.segments[seg_num].goto(new_x, new_y)
我认为你不需要移动每个尾部片段的头部。相反，你应该先移动头部一次，然后移动所有尾部片段一次：
def move(self):
self.head.forward(MOVE_DISTANCE) # Moving distance of head
for seg_num in range(len(self.segments) - 1, 0, -1):
new_x = self.segments[seg_num - 1].xcor()
new_y = self.segments[seg_num - 1].ycor()
self.segments[seg_num].goto(new_x, new_y)
这是一个经过一些调整的可运行示例：
from random import randint
from turtle import Screen, Turtle
GRID_SIZE = 20
class Snake:
POSITIONS = (0, 0), (GRID_SIZE, 0), (GRID_SIZE * 2, 0)
def __init__(self):
self.segments = []
self.create_snake()
self.head = self.segments[0]
def create_snake(self):
for position in Snake.POSITIONS:
self.add_segment(position)
def add_segment(self, position):
new_segment = Turtle("square")
new_segment.color("white")
new_segment.penup()
new_segment.goto(position)
self.segments.append(new_segment)
def move(self):
self.head.forward(GRID_SIZE)
for seg_num in range(len(self.segments) - 1, 0, -1):
new_x = self.segments[seg_num - 1].xcor()
new_y = self.segments[seg_num - 1].ycor()
self.segments[seg_num].goto(new_x, new_y)
def grow(self):
self.add_segment(self.segments[-1].position())
def up(self):
if self.head.heading() != 270:
self.head.setheading(90)
def down(self):
if self.head.heading() != 90:
self.head.setheading(270)
def left(self):
if self.head.heading() != 0:
self.head.setheading(180)
def right(self):
if self.head.heading() != 180:
self.head.setheading(0)
def eats(self, food):
return self.head.distance(food.position()) < GRID_SIZE / 2
def collides_with_wall(self):
return (
self.head.xcor() < -w
or self.head.xcor() > w
or self.head.ycor() < -h
or self.head.ycor() > h
)
def collides_with_itself(self):
for segment in self.segments[3:]:
if self.head.distance(segment) < GRID_SIZE:
return True
return False
class Food:
def __init__(self):
self.pen = pen = Turtle()
pen.shape("circle")
pen.penup()
pen.shapesize(stretch_len=0.5, stretch_wid=0.5)
pen.color("red")
pen.speed("fastest")
self.reposition()
def reposition(self):
self.pen.goto(
randint(-w, w) // GRID_SIZE * GRID_SIZE,
randint(-h, h) // GRID_SIZE * GRID_SIZE,
)
def position(self):
return self.pen.pos()
def tick():
snake.move()
if snake.eats(food):
food.reposition()
snake.grow()
if snake.collides_with_wall() or snake.collides_with_itself():
screen.update()
return
screen.update()
screen.ontimer(tick, fps)
screen = Screen()
screen.setup(width=1000, height=600)
fps = 1000 // 10
w = screen.window_width() / 2 - GRID_SIZE
h = screen.window_height() / 2 - GRID_SIZE
screen.bgcolor("black")
screen.title("My Snake Game")
screen.tracer(0)
snake = Snake()
food = Food()
screen.listen()
screen.onkey(snake.up, "Up")
screen.onkey(snake.down, "Down")
screen.onkey(snake.left, "Left")
screen.onkey(snake.right, "Right")
tick()
screen.exitonclick()
还有改进的空间，但总体来说应该更容易维护。
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update()应该sleep()是循环中的最后一行（或者更好的是，）。–
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