Question

当我按下笔记本电脑键盘上的空格键时，我的外星人入侵程序没有显示出从火箭图像顶部发射的子弹。

我遵循了Python Crash课程书中的代码示例，并准确地遵循了每个步骤，但是我的代码仍然无法正常工作。

我已经为代码编写了五个python文件。我编译和运行程序的主要代码是Alien_invasion.py文件。我将在这里列出它们。这里也是我代码的github链接，其中包含我程序的火箭图像 alien_invasion.py

来自Alien_invasion.py：

import sys
import pygame
from settings import Settings
from ship import Ship
import game_functions as gf
from pygame.sprite import Group
def run_game():

pygame.init()
ai_settings=Settings()
#Make a group that stores bullet



screen=pygame.display.set_mode((ai_settings.screen_width,ai_settings.screen_height))
#set the background color.
bg_color=(0,191,255)
#Start the main cloop for the game
#Make a Ship
ship=Ship(ai_settings,screen)
bullets=Group()
while True:
    gf.check_events(ai_settings,screen,ship,bullets)

    ship.update()
    bullets.update()
    gf.update_screen(ai_settings,screen,ship,bullets)


    #Watch for keyboard and mouse events.
    for event in pygame.event.get():
        if event.type==pygame.QUIT:
            sys.exit()



    #mAKE THE MOST RECENTLY DRAWN SCREEN VISIBLE
    #redraw the screen during each pass through the VISIBLE
    screen.fill(ai_settings.bg_color)
    ship.blitme()

    pygame.display.flip()

run_game()

game_function.py

import sys

import pygame
from bullet import Bullet
def check_keydown_events(event,ai_settings,screen,ship,bullets):
"""Respond to keypresses"""
if event.key==pygame.K_RIGHT:
    ship.moving_right=True
elif event.key==pygame.K_LEFT:
    ship.moving_left=True
elif event.key==pygame.K_SPACE:
    #Create a new bullet and add it to the bullets group
    new_bullet=Bullet(ai_settings,screen,ship)
    bullets.add(new_bullet)
def check_keyup_events(event,ship):
    """Respond to key releases"""
    if event.key==pygame.K_RIGHT:
        ship.moving_right=False
    elif event.key==pygame.K_LEFT:
        ship.moving_left=False

def check_events(ai_settings,screen,ship,bullets):
    """Respond to keypresses and mouse events"""
    for event in pygame.event.get():
        if event.type==pygame.QUIT:
            sys.exit()
        elif event.type==pygame.KEYDOWN:
            check_keydown_events(event,ai_settings,screen,ship,bullets)
        elif event.type==pygame.KEYUP:
            check_keyup_events(event,ship)

def update_screen(ai_settings,screen,ship,bullets):
     """Update images on the screen and flip to the new screen"""
    #Redrwaa all bullets behind ship and aliens

    for bullet in bullets.sprites():
        bullet.draw_bullet()
    #Redraw he screen during each pass through the loop.

    screen.fill(ai_settings.bg_color)
    ship.blitme()

    #Make the most recently drawn screen VISIBLE
    pygame.display.flip()

settings.py

class Settings():
    def __init__(self):
        self.screen_width=1200
        self.screen_height=800
        self.bg_color=(255,255,255)
        #Ship Settings
        self.ship_speed_factor=1.5

        #Bullet settings
        self.bullet_speed_factor=10
        self.bullet_width=25
        self.bullet_height=75
        self.bullet_color=0,0,0

bullet.py

 import pygame
 from pygame.sprite import Sprite
 class Bullet(Sprite):
"""A class to manage bullets fired from a ship """
   def __init__(self,ai_settings,screen,ship):
        """Create a bullet object at the ships current position"""
        super(Bullet,self).__init__()
        self.screen=screen
        #Create a bullet rect at (0,0) and then set the correct posiiton


    self.rect=pygame.Rect(0,0,ai_settings.bullet_width,
    ai_settings.bullet_height)
    self.rect.centerx=ship.rect.centerx
    self.rect.top=ship.rect.top

    #Store bullets position as a decimal value
    self.y=float(self.rect.y)
    self.color=ai_settings.bullet_color
    self.speed_factor=ai_settings.bullet_speed_factor

   def update(self):
       """Move the bullet up pthe screen"""
        #Update the decimal position of the bullets
        self.y-=self.speed_factor
        #Update the rect position
        self.rect.y=self.y
   def draw_bullet(self):
        """Draw the bullet to the screen"""
        pygame.draw.rect(self.screen,self.color,self.rect)

ship.py

class Ship():
    def __init__(self,ai_settings,screen):
         """ Initialize the ship and set its starting position"""
        self.screen=screen
        self.ai_settings=ai_settings
        #Load the ship image and get it RECENTLY
        self.image=pygame.image.load('images/ship.bmp')
        self.rect=self.image.get_rect()
        self.screen_rect=screen.get_rect()

        #Start each new ship at the bottom of the center of the screen_rect
        self.rect.centerx=self.screen_rect.centerx
        self.rect.bottom=self.screen_rect.bottom
        #movement flag
        self.moving_right=False
        self.moving_left=False
        #Store a decimal value for the ships centerx
        self.center=float(self.rect.centerx)

    def blitme(self):
        """ Draw the ship at its current location"""
        self.screen.blit(self.image,self.rect)
    def update(self):
        """Update the ships position based on the movement flag."""
        """Update the ships center value, not the rect"""
        if self.moving_right and self.rect.right<self.screen_rect.right:
             self.center+=self.ai_settings.ship_speed_factor
        elif self.moving_left and self.rect.left>0:
            self.center-=self.ai_settings.ship_speed_factor
        #Update rect object from self.centerx
         self.rect.centerx=self.center

Python外星人入侵游戏无法发射子弹

0 个答案: