[游戏开发]python07-案例-外星人入侵-1

alien_invasion.py

# -*- coding: utf-8 -*-

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()
    screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_height))
    pygame.display.set_caption("Alien Invasion")
    
    ship = Ship(ai_settings, screen)
    bullets = Group()
    while True:
        gf.check_events(ai_settings, screen, ship, bullets)
        ship.update()
        bullets.update()
        gf.update_bullets(bullets)
        gf.update_screen(ai_settings, screen, ship, bullets)
        
run_game()

bullet.py

# -*- coding: utf-8 -*-

import pygame
from pygame.sprite import Sprite

class Bullet(Sprite):
    def __init__(self, ai_settings, screen, ship):
        super().__init__()
        self.screen = screen
        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
        self.y = float(self.rect.y)
        self.color = ai_settings.bullet_color
        self.speed_factor = ai_settings.bullet_speed_factor
    
    def update(self):
        self.y -= self.speed_factor
        self.rect.y = self.y
    
    def draw_bullet(self):
        pygame.draw.rect(self.screen, self.color, self.rect)

game_functions.py

# -*- coding: utf-8 -*-

import sys
import pygame
from bullet import Bullet

def check_keydown_event(event, ai_settings, screen, ship, bullets):
    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:
        fire_bullet(ai_settings, screen, ship, bullets)

def fire_bullet(ai_settings, screen, ship, bullets):
    if len(bullets) < ai_settings.bullet_allowed:
            new_bullet = Bullet(ai_settings, screen, ship)
            bullets.add(new_bullet)

def check_keyup_event(event,ship):
    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):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            check_keydown_event(event, ai_settings, screen, ship, bullets)
        elif event.type == pygame.KEYUP:
            check_keyup_event(event, ship)

def update_screen(ai_settings, screen, ship, bullets):
    screen.fill(ai_settings.bg_color)
    for bullet in bullets.sprites():
        bullet.draw_bullet()
    ship.blitme()
    pygame.display.flip()

def update_bullets(bullets):
    bullets.update()
    for bullet in bullets.copy():
        if bullet.rect.bottom <= 0:
            bullets.remove(bullet)

settings.py

# -*- coding: utf-8 -*-

class Settings():
    def __init__(self):
        self.screen_width = 900
        self.screen_height = 600
        self.bg_color = (230, 230, 230)
        self.ship_speed_factor = 1.5
        
        self.bullet_speed_factor = 1
        self.bullet_width = 3
        self.bullet_height = 15
        self.bullet_color =(60, 60, 60)
        self.bullet_allowed = 3

ship.py

# -*- coding: utf-8 -*-

import pygame

class Ship():
    def __init__(self,ai_settings,screen):
        self.screen = screen
        self.ai_settings = ai_settings
        self.image = pygame.image.load('images/ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom
        self.center = float(self.rect.centerx)
        self.moving_right = False
        self.moving_left = False
    
    def update(self):
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.center += self.ai_settings.ship_speed_factor
        if self.moving_left and self.rect.left > 0:
            self.center -= self.ai_settings.ship_speed_factor
        self.rect.centerx = self.center
    
    def blitme(self):
        self.screen.blit(self.image,self.rect)

ship.bmp