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Copy pathgame_functions.py
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166 lines (138 loc) · 5.88 KB
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import sys
from time import sleep
import pygame
from bullet import Bullet
from alien import Alien
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_events(event, ai_settings, screen, ship, bullets)
elif event.type == pygame.KEYUP:
check_keyup_events(event, ship)
def check_keydown_events(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:
#创建一颗子弹加入到编组bullets中
fire_bullet(ai_settings, screen, ship, bullets)
#快捷键按q结束游戏
elif event.key == pygame.k_q:
sys.exit()
def fire_bullet(ai_settings, screen, ship, bullets):
"如果还没达到限制，就发射导弹"
if len(bullets) < ai_settings.bullets_allowed:
new_bullet = Bullet(ai_settings, screen, ship)
bullets.add(new_bullet)
def check_keyup_events(event, ship):
if event.key == pygame.K_RIGHT:
ship.moving_right = False
elif event.key == pygame.K_LEFT:
ship. moving_left = False
#更新屏幕图像并切换新屏幕
def update_screen(ai_settings, screen, ship, aliens, bullets):
screen.fill(ai_settings.bg_color)
#飞船和外星人后面重绘所有子弹
for bullet in bullets.sprites():
bullet.draw_bullet()
ship.blitme()
aliens.draw(screen)
#让最近绘制屏幕可见
pygame.display.flip()
def update_bullets(ai_settings, screen, ship, aliens, bullets):
#更新子弹位置
bullets.update()
#删除已消失的子弹
for bullet in bullets.copy():
if bullet. rect.bottom <= 0:
bullets.remove(bullet)
check_bullet_alien_collisions(ai_settings, screen, ship, aliens, bullets)
def check_bullet_alien_collisions(ai_settings, screen, ship, aliens, bullets):
#"响应子弹和外星人的碰撞时，删除发生碰撞子弹外星人“
collisions = pygame.sprite.groupcollide(bullets, aliens, True, True)
if len(aliens) == 0:
#删除现有子弹重建一群外星人
bullets.empty()
create_fleet(ai_settings, screen, ship, aliens)
def get_number_aliens_x(ai_settings, alien_width):
"计算每一行可容纳外星人数量"
available_space_x = ai_settings.screen_width - 2 * alien_width
number_aliens_x = int(available_space_x / (2 * alien_width))
return number_aliens_x
def get_number_rows(ai_settings, ship_height, alien_height):
"计算可以容纳多少行外星人"
available_space_y = (ai_settings.screen_height - (3 * alien_height) - ship_height)
number_rows = int(available_space_y / (2 * alien_height))
return number_rows
def create_alien(ai_settings, screen, aliens, alien_number, row_number):
"创建一个外星人且将其放在当前"
alien = Alien(ai_settings, screen)
alien_width = alien.rect.width
alien.x = alien_width + 2 * alien_width *alien_number
alien.rect.x = alien.x
alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number
aliens.add(alien)
def create_fleet(ai_settings, screen, ship, aliens):
"创建外星人群"
#创建一个外星人，并且计算一行可容纳外星人数
#外星人间距为外星人宽度
alien = Alien(ai_settings, screen)
number_aliens_x = get_number_aliens_x(ai_settings, alien.rect.width)
number_rows = get_number_rows(ai_settings, ship.rect.height,
alien.rect.height)
#创建外星人群
#创建第一行外星人
#创建第一个外星人并且加入当前
for row_number in range(number_rows):
for alien_number in range(number_aliens_x):
create_alien(ai_settings, screen, aliens, alien_number,
row_number)
def check_fleet_edges(ai_settings, aliens):
"有外星人接触到边缘时候采取的措施"
for alien in aliens.sprites():
if alien.check_edges():
change_fleet_direction(ai_settings, aliens)
break
def change_fleet_direction(ai_settings, aliens):
"将整群外星人下移，并改变方向"
for alien in aliens.sprites():
alien.rect.y += ai_settings.fleet_drop_speed
ai_settings.fleet_direction *= -1
def ship_hit(ai_settings, stats, screen, ship, aliens, bullets):
"响应被外星人撞到的飞船"
if stats.ships_left > 0:
#将ship——left减 1
stats.ships_left -= 1
#清空外星人列表和子弹列表
aliens.empty()
bullets.empty()
#创建一群新的外星人，并且将飞船放到屏幕底段中央
create_fleet(ai_settings, screen, ship, aliens)
ship.center_ship()
#暂停
sleep(0.5)
#如果没有飞船，将game active 设置为false
else:
stats.game_active = False
def check_aliens_bottom(ai_settings, stats, screen, ship, aliens, bullets):
"检测是否有外星人到达底部"
screen_rect = screen.get_rect()
for alien in aliens.sprites():
if alien.rect.bottom >= screen_rect.bottom:
#像飞船被撞到一样处理
ship_hit(ai_Settings, stats, screen, ship, aliens, bullets)
break
def update_aliens(ai_settings, stats, screen, ship, aliens, bullets):
"检查是否有外星人位于边缘"
"更新外星人群中所有外星人位置"
check_fleet_edges(ai_settings, aliens)
aliens.update()
"检查是否有外星人到达屏幕底端"
check_aliens_bottom(ai_settings,stats,screen,ship,aliens,bullets)
"检测外星人和飞船之间的碰撞"
if pygame.sprite.spritecollideany(ship, aliens):
ship_hit(ai_settings, stats, screen, ship, aliens, bullets)
print("ship hit!!")