如果语句在一段时间后停止工作并且字体未呈现

Question

我正在使用 VSCode 使用 pygame 和 python 3.10.0 创建一个游戏，一切正常，但是这个 if 语句在一段时间后停止工作并且字体没有绘制，但我无法确定问题所在，对于 if声明它通常运行到 10 或 11 分，但它可以更快，如 2：

 if player.rect.colliderect(food):
    pygame.sprite.Sprite.kill(food)
    food.rect.x = random.randrange(20, 1700)
    food.rect.y = random.randrange(20, 860)
    all_sprites_list.add(food)
    score += 1
    print(score)

---

完整代码：

import pygame
import sys
import time
import random
import ctypes

from ctypes import wintypes
from pygame import sprite
from pygame.draw import rect
from pygame.event import pump, wait
from pygame import font
pygame.font.init()

myappid = 'elementalstudios.snake.Alpha 0_1' # arbitrary string
ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID(myappid)


#------ Initialize Variables------#
# Player
player_width = 20
player_height = 20
# Food
food_width = 10
food_height = 10
# Colours
seafoam_gr = (159, 226, 191)
black = (0, 0, 0)
blue = (0, 0, 255)
red = (255, 0, 0)
green = (0, 255, 0)
white = (255, 255, 255)
# Score 
score = 0

#------ Score Font Initialize ------#
font = pygame.font.Font(None, 50)
text = font.render("Score:", False, white, None)

#------Sprites Class------#
class Sprite(pygame.sprite.Sprite):
    def __init__(self, color, height, width):
        super().__init__()

        self.image = pygame.Surface([width, height])
        self.image.fill(seafoam_gr)
        self.image.set_colorkey(black)

        pygame.draw.rect(self.image,
                         color,
                         pygame.Rect(0, 0, width, height))
  
        self.rect = self.image.get_rect()

    def moveRight(self, pixels):
        self.rect.x += pixels

    def moveLeft(self, pixels):
        self.rect.x -= pixels

    def moveUp(self, speed):
        self.rect.y -= speed * speed / 5

    def moveDown(self, speed):
        self.rect.y += speed * speed / 5

#------ Font Class ------#
def create_font(t,s = 24, colour_font = white, bold = False, italic = False):
    font = pygame.font.Font("prstart.ttf", s, bold, italic)
    text = font.render(t, True, colour_font)
    return text

#------ Initialize Pygame and Window------#
pygame.init()

icon = pygame.image.load('Icon.ico')
pygame.display.set_icon(icon)
gameDisplay = pygame.display.set_mode((1920,1080), pygame.FULLSCREEN)
#rect = pygame.Rect( * gameDisplay.get_rect().center, 0, 0).inflate(100, 100)
pygame.display.set_caption("Blocky")
gameDisplay.fill(black)
clock = pygame.time.Clock()
running = True

#------Initialize Sprites------#
all_sprites_list = pygame.sprite.Group()
player = Sprite(seafoam_gr, player_height, player_width)
food = Sprite(red, food_height, food_width)
player.rect.x = 960
player.rect.y = 540
food.rect.x = 20 #random.randrange(20, 1800)
food.rect.y = 30 #random.randrange(20, 1050)

#------Add Sprites to sprite list------#
all_sprites_list.add(player)
all_sprites_list.add(food)

clock = pygame.time.Clock()

while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_ESCAPE:
                running = False

    #------Eating------#
    if player.rect.colliderect(food):
        pygame.sprite.Sprite.kill(food)
        food.rect.x = random.randrange(20, 1700)
        food.rect.y = random.randrange(20, 860)
        all_sprites_list.add(food)
        score += 1
        print(score)

    #------ Score Draw ------#
    text_rect = text.get_rect()
    text_rect.center = (100, 150)

    gameDisplay.blit(text, text_rect)
    #------Key Movement------#
    keys = pygame.key.get_pressed()
    # Move Left
    if keys[pygame.K_a]:
        player.moveLeft(3)
        if keys[pygame.K_LCTRL]:
            player.moveLeft(5)
    if keys[pygame.K_LEFT]:
        player.moveLeft(3)
        if keys[pygame.K_LCTRL]:
            player.moveLeft(5)
    # Move Right
    if keys[pygame.K_d]:
        player.moveRight(5)
        if keys[pygame.K_LCTRL]:
            player.moveRight(5)
    if keys[pygame.K_RIGHT]:
        player.moveRight(3)
        if keys[pygame.K_LCTRL]:
            player.moveRight(5)
    # Move Down
    if keys[pygame.K_s]:
        player.moveDown(3)
        if keys[pygame.K_LCTRL]:
            player.moveDown(5)
    if keys[pygame.K_DOWN]:
        player.moveDown(3)
        if keys[pygame.K_LCTRL]:
            player.moveDown(5)
    # Move Up
    if keys[pygame.K_w]:
        player.moveUp(3)
        if keys[pygame.K_LCTRL]:
            player.moveUp(5)
    if keys[pygame.K_UP]:
        player.moveUp(3)
        if keys[pygame.K_LCTRL]:
            player.moveUp(5)

    all_sprites_list.update()
    gameDisplay.fill(black)
    all_sprites_list.draw(gameDisplay)
    pygame.display.flip()
    clock.tick(60)

pygame.quit()
quit()

Answer 1

没有必要kill食物对象。改变食物的位置就足够了。 pygame.sprite.Sprite.kill 只是从所有 Gorups 中删除 Sprite 对象。所以调用kill然后将对象添加回Group是没有意义的。

文本不显示，因为您在清除显示之前绘制了它。 pygame.Surface.fill 用纯色填充 Surface。之前绘制的所有内容都将被清除。 blitfill之后的文字。
如果分数发生变化，您将不得不再次渲染文本 Surface。

我建议简化移动播放器的代码。见How can I make a sprite move when key is held down。

class Sprite(pygame.sprite.Sprite):
    def __init__(self, color, x, y, height, width):
        super().__init__()
        self.image = pygame.Surface([width, height])
        self.image.fill(color)
        self.image.set_colorkey(black)
        self.rect = self.image.get_rect(topleft = (x, y))
        self.x, self.y = self.rect.x, self.rect.y

    def move(self, move_x, move_y, speed_up):
        if move_x or move_y:
            direction = pygame.math.Vector2(move_x, move_y)
            direction.scale_to_length(5 if speed_up else 3)
            self.x += direction.x
            self.y += direction.y
            self.rect.x, self.rect.y = round(self.x), round(self.y)

player = Sprite(seafoam_gr, 400, 300, player_height, player_width)
food = Sprite(red, 20, 30, food_height, food_width)

while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_ESCAPE:
                running = False

    if player.rect.colliderect(food):
        food.rect.x = random.randrange(20, 780)
        food.rect.y = random.randrange(20, 580)
        score += 1

        # render text
        text = font.render("Score: " + str(score), False, white, None)

    keys = pygame.key.get_pressed()
    move_x = ((keys[pygame.K_d] or keys[pygame.K_RIGHT]) - (keys[pygame.K_a] or keys[pygame.K_LEFT]))
    move_y = ((keys[pygame.K_s] or keys[pygame.K_DOWN]) - (keys[pygame.K_w] or keys[pygame.K_UP]))
    player.move(move_x, move_y, keys[pygame.K_LCTRL])

    all_sprites_list.update()
    
    gameDisplay.fill(black)

    # draw text
    gameDisplay.blit(text, text.get_rect(center = (100, 150)))
    
    all_sprites_list.draw(gameDisplay)
    pygame.display.flip()

    clock.tick(60)

pygame.quit()
quit()