Pygame "catcher“(精灵)不会移动。Python速成课程13-5

Question

我正在试着做一个接球动作，以便接住一些落下的球。球和捕手是精灵(为了使用pygame.sprite.groupcollide)。然而，捕手站着不动，不服从任何命令。我没有收到任何订单。我是个菜鸟。

我检查了每一个函数，但我找不到任何原因。

主代码：

import pygame
import sys
from pygame.sprite import Group
import game_functions as gf
from settings import Settings
from guy import Guy


def run_game():
    pygame.init()
    settings = Settings()
    screen = pygame.display.set_mode((settings.screen_width, settings.screen_height))
    pygame.display.set_caption('Catcher game')
    balls = Group()
    guys = Group()
    guy = Guy(screen, settings)
    guys.add(guy)
    while True:
        for guy in guys:
            gf.check_events(guy)
        guy.update()
        gf.update_ball (settings, screen, guys, balls)
        gf.check_ball_bottom (settings, balls)
        gf.update_screen (screen, guys, balls, settings)

run_game()

功能：

import pygame
import sys
from ball import Ball
from settings import Settings
from guy import Guy

def check_events(guy):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.display.quit()
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            check_keydown_events (event, guy )
        elif event.type == pygame.KEYUP:
            check_keyup_events (event, guy)

def check_keydown_events (event, guy):
    if event.key == pygame.K_RIGHT:
        guy.moving_right == True
    elif event.key == pygame.K_LEFT:
        guy.moving_left == True
    elif event.key == pygame.K_q:
        pygame.display.quit()
        sys.exit()

def check_keyup_events (event, guy):
    if event.key == pygame.K_RIGHT:
        guy.moving_right == False
    elif event.key == pygame.K_LEFT:
        guy.moving_left == False

def create_new_ball (screen, settings, balls):
    new_ball = Ball (screen, settings)
    balls.add(new_ball)

def update_ball (settings, screen, guys, balls):
    #we have to check if there is any ball left
    if len(balls) == 0:
        create_new_ball (screen, settings, balls)

    collisions = pygame.sprite.groupcollide (balls, guys, True, False)

def check_ball_bottom (settings, balls):
    for ball in balls.copy():
        if ball.rect.y > settings.screen_height:
            balls.remove(ball)

def update_screen (screen, guys, balls, settings):
    screen.fill(settings.bg_color)

    for ball in balls:
        ball.update()
    balls.draw(screen)
    for guy in guys:
        guy.blitme()

    pygame.display.flip()

捕获器类：

import pygame

from pygame.sprite import Sprite

class Guy(Sprite):
    def __init__(self, screen, settings):
        super().__init__()
        self.screen = screen
        self.image = pygame.image.load('images/guy.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        self.settings = settings

        #set character position
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom

        #set flags
        self.moving_right = False
        self.moving_left = False

        self.center = float(self.rect.centerx)

    def update (self):
        if self.moving_right and self.rect.right < self.setting.width:
            self.center += self.settings.guy_speed
        if self.moving_left and self.rect.left > 0 :
            self.center -= self.settings.guy_speed

        self.rect.centerx = self.center


    def blitme(self):
        self.screen.blit (self.image, self.rect)
        #IS this method necessaire if I use guys.draw()?

我没有收到任何错误消息。

Answer 1

我怀疑您的问题至少有一部分是使用==而不是=为变量赋值。例如,

if event.key == pygame.K_RIGHT:
    guy.moving_right == True

应该是

if event.key == pygame.K_RIGHT:
    guy.moving_right = True

这没有显示任何错误的原因是，它仍然是有效的python自己做一个相等的比较。