12.3 火箭

rocket_fly.py

# -*- coding:utf_8 -*-
"""
作者：蓝小武
日期：2022年01月13日
"""
import sys
import pygame
from rocket_settings import Settings
from rocket import Rocket
import rocket_functions as rf

def run_game():
    """初始化游戏并创建一屏幕对象"""
    pygame.init()
    ai_settings = Settings()
    screen = pygame.display.set_mode(
        (ai_settings.screen_width,ai_settings.screen_heigh))
    pygame.display.set_caption("一飞冲天")
    """设置背景色"""
    bg_color = (150,162,140)
    '''创建一支火箭'''
    rocket = Rocket(ai_settings,screen)
    """开始游戏的主循环"""
    while True:
        '''监视键盘和鼠标事件'''
        rf.check_events(rocket)
        rocket.update()
        '''每次循环时都重绘屏幕'''
        rf.update_screen(ai_settings,screen,rocket)
run_game()

 rocket_settings.py

# -*- coding:utf_8 -*-
"""
作者：蓝小武
日期：2022年01月13日
"""
class Settings():
    """存储《一飞冲天》的所有设置的类"""
    def __init__(self):
        '''初始化游戏的设置'''
        self.screen_width = 1200
        self.screen_heigh = 800
        self.bg_color = (150,162,140)
        self.rocket_speed_factor = 1.5

 rocket.py

# -*- coding:utf_8 -*-
"""
作者：蓝小武
日期：2022年01月13日
"""
import pygame

class Rocket():

    def __init__(self,ai_settings,screen):
        '''初始化火箭并设置其初始位置'''
        self.screen = screen
        self.ai_settings = ai_settings
        '''加载火箭图像并获取其外接矩形'''
        self.image = pygame.image.load('images/rocket.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        '''将每艘新火箭放在屏幕中央'''
        self.rect.centerx = self.screen_rect.centerx
        self.rect.centery = self.screen_rect.centery
        '''在火箭的属性center中存储小数值'''
        self.center1 = float(self.rect.centerx)
        self.center2 = float(self.rect.centery)
        '''移动标志'''
        self.moving_right = False
        self.moving_left = False
        self.moving_up = False
        self.moving_down = False

    def update(self):
        '''根据移动标志调整火箭的位置'''
        '''更新火箭的center值，而不是rect'''
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.center1 += self.ai_settings.rocket_speed_factor
        if self.moving_left and self.rect.left > 0:
            self.center1 -= self.ai_settings.rocket_speed_factor
        if self.moving_up and self.rect.top > 0:
            self.center2 -= self.ai_settings.rocket_speed_factor
        if self.moving_down and self.rect.bottom < self.screen_rect.bottom:
            self.center2 += self.ai_settings.rocket_speed_factor
        '''根据self.center更新rect对象'''
        self.rect.centerx = self.center1
        self.rect.centery = self.center2

    def blitme(self):
        '''在指定位置绘制火箭'''
        self.screen.blit(self.image,self.rect)

 rocket_function.py

# -*- coding:utf_8 -*-
"""
作者：蓝小武
日期：2022年01月13日
"""
import sys
import pygame
def check_keydown_events(event,rocket):
    '''响应按键'''
    if event.key == pygame.K_RIGHT:
        rocket.moving_right = True
    elif event.key == pygame.K_LEFT:
        rocket.moving_left = True
    elif event.key == pygame.K_UP:
        rocket.moving_up = True
    elif event.key == pygame.K_DOWN:
        rocket.moving_down = True

def check_keyup_events(event,rocket):
    if event.key == pygame.K_RIGHT:
        rocket.moving_right = False
    elif event.key == pygame.K_LEFT:
        rocket.moving_left = False
    elif event.key == pygame.K_UP:
        rocket.moving_up = False
    elif event.key == pygame.K_DOWN:
        rocket.moving_down = False

def check_events(rocket):
    '''响应按键和鼠标事件'''
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            check_keydown_events(event,rocket)
        elif event.type == pygame.KEYUP:
            check_keyup_events(event,rocket)
def update_screen(ai_settings,screen,ship):
    '''更新屏幕上的图像，并切换到新屏幕'''
    '''每次循环时都重绘屏幕'''
    screen.fill(ai_settings.bg_color)
    ship.blitme()
    '''让最近绘制的屏幕可见'''
    pygame.display.flip()