python-3.x - 如何为贪吃蛇游戏生成食物

Question

我不知道如何生成蛇吃的食物。我知道蛇在第 97 行和第 98 行的位置，我创建了一个类来生成一个像素，我想在第 22 行绘制一个和平的食物(编辑:可能应该是一个函数，评论#def(？)在编码)。我所要做的就是从随机分配的位置在 x 和 y 坐标处添加 15 个像素，然后打印它以获得一个 block 。

问题是检查我吃不吃。它应该是这样的:

if x >= x_food && x <= x_food + 15 || y >= y_food && y <= y_food + 15:
    ...add a point and make snake longer...

问题是出于某种原因将它们放在一起。有人可以给我提示或解决我应该如何编写此类，以便我可以继续处理其他问题吗？谢谢!

import pygame
import random

#Global variables
#Color
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)

#Start length of snake
snake_length = 3

#Set the width of the segments of the snake
segment_width = 15
segment_height = 15
# Margin within each segment
segment_margin = 3

#Set initial speed
x_change = segment_width + segment_margin
y_change = 0

#def (?)
class Food():
    #Class to print food
    x_food = random.randint(0, 785)
    y_food = random.randint(0, 585)


class Segment(pygame.sprite.Sprite):
    """ Class to represent the segment of the snake. """
    # Methods
    # Constructer function
    def __init__(self, x, y):
        #Call the parents constructor
        super().__init__()

        #Set height, width
        self.image = pygame.Surface([segment_width, segment_height])
        self.image.fill(WHITE)

        #Make our top-left corner the passed-in location.
        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y

#Call this function so the Pygame library can initialize itself
pygame.init()

#Create an 800x600 size screen
screen = pygame.display.set_mode([800, 600])

#Set the title of the window
pygame.display.set_caption("Snake")

allspriteslist = pygame.sprite.Group()

#Create an initial snake
snake_segments = []
for i in range(snake_length):
    x = 250 - (segment_width + segment_margin) * i
    y = 30
    segment = Segment(x, y)
    snake_segments.append(segment)
    allspriteslist.add(segment)

clock = pygame.time.Clock()
done = False

while not done:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True

        #Set the speed based on the key pressed
        #We want the speed to be enough that we move a full
        #Segment, plus the margin
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                x_change = (segment_width + segment_margin) * -1
                y_change = 0
            if event.key == pygame.K_RIGHT:
                x_change = (segment_width + segment_margin)
                y_change = 0
            if event.key == pygame.K_UP:
                x_change = 0
                y_change = (segment_height + segment_margin) * -1
            if event.key == pygame.K_DOWN:
                x_change = 0
                y_change = (segment_width + segment_margin)

    #Get rid of last segment of the snake
    #.pop() command removes last item in list
    old_segment = snake_segments.pop()
    allspriteslist.remove(old_segment)

    #Figure out where new segment will be
    x = snake_segments[0].rect.x + x_change
    y = snake_segments[0].rect.y + y_change
    segment = Segment(x, y)

    #Insert new segment to the list
    snake_segments.insert(0, segment)
    allspriteslist.add(segment)

    #Draw
    #Clear screen
    screen.fill(BLACK)

    allspriteslist.draw(screen)

    #Flip screen
    pygame.display.flip()

    #Pause
    clock.tick(5)

pygame.quit()

Answer 1

我拿了你的代码，我想我解决了一些问题，请注意，这只会在蛇越过街区时进行监控，然后它会打印:yummy，所以你必须添加细节，还要注意我不使用你的类来生成食物:

import pygame
import random

#Global variables
#Color
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)

#Start length of snake
snake_length = 3

#Set the width of the segments of the snake
segment_width = 15
segment_height = 15
# Margin within each segment
segment_margin = 3

#Set initial speed
x_change = segment_width + segment_margin
y_change = 0

#def (?)
class Food():
    #Class to print food
    x_food = random.randint(0, 785)
    y_food = random.randint(0, 585)


class Segment(pygame.sprite.Sprite):
    """ Class to represent the segment of the snake. """
    # Methods
    # Constructer function
    def __init__(self, x, y):
        #Call the parents constructor
        super().__init__()

        #Set height, width
        self.image = pygame.Surface([segment_width, segment_height])
        self.image.fill(WHITE)

        #Make our top-left corner the passed-in location.
        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y

#Call this function so the Pygame library can initialize itself
pygame.init()

#Create an 800x600 size screen
screen = pygame.display.set_mode([800, 600])

#Set the title of the window
pygame.display.set_caption("Snake")

allspriteslist = pygame.sprite.Group()

#Create an initial snake
snake_segments = []
for i in range(snake_length):
    x = 250 - (segment_width + segment_margin) * i
    y = 30
    segment = Segment(x, y)
    snake_segments.append(segment)
    allspriteslist.add(segment)

clock = pygame.time.Clock()
done = False
x_food = random.randint(0, 785)
y_food = random.randint(0, 585)

while not done:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True

        #Set the speed based on the key pressed
        #We want the speed to be enough that we move a full
        #Segment, plus the margin
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                x_change = (segment_width + segment_margin) * -1
                y_change = 0
            if event.key == pygame.K_RIGHT:
                x_change = (segment_width + segment_margin)
                y_change = 0
            if event.key == pygame.K_UP:
                x_change = 0
                y_change = (segment_height + segment_margin) * -1
            if event.key == pygame.K_DOWN:
                x_change = 0
                y_change = (segment_width + segment_margin)

            if y < y_food+30:
                if x > x_food and x < x_food+30 or x+20 > x_food and x+20<x_food+30:
                    print('yummy')



    #Get rid of last segment of the snake
    #.pop() command removes last item in list
    old_segment = snake_segments.pop()
    allspriteslist.remove(old_segment)

    #Figure out where new segment will be
    x = snake_segments[0].rect.x + x_change
    y = snake_segments[0].rect.y + y_change
    segment = Segment(x, y)

    #Insert new segment to the list
    snake_segments.insert(0, segment)
    allspriteslist.add(segment)

    #Draw
    #Clear screen
    screen.fill(BLACK)
    pygame.draw.rect(screen, WHITE, [x_food, y_food, 30, 30])

    allspriteslist.draw(screen)

    #Flip screen
    pygame.display.flip()

    #Pause
    clock.tick(5)

pygame.quit()

希望对您有所帮助，谢谢!