#game_functions.py
def check_keydown_events(event,ai_settings,screen,ship,bullets):
"""响应按键和鼠标事件"""
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)
elif event.key == pygame.K_q:
sys.exit()
def fire_bullet(ai_settings,screen,ship,bullets):
"""没超就发射子弹"""
#创建一颗子弹，并加到编组bullets中
if len(bullets) < ai_settings.bullet_allowed:
new_bullet = Bullet(ai_settings,screen,ship)
bullets.add(new_bullet)
def check_keyup_events(event,ship):
"""响应松开"""
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,stats,sb,play_button,ship,aliens,bullets):
"""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,ai_settings,screen,ship,bullets)
elif event.type == pygame.KEYUP:
check_keyup_events(event,ship)
elif event.type == pygame.MOUSEBUTTONDOWN:
mouse_x,mouse_y = pygame.mouse.get_pos()
check_play_button(ai_settings,screen,stats,sb,play_button,ship,
aliens,bullets,mouse_x,mouse_y)
def check_play_button(ai_settings,screen,stats,sb,play_button,ship,
aliens,bullets,mouse_x,mouse_y):
"""在玩家单机Play按钮开始新游戏"""
button_clicked = play_button.rect.collidepoint(mouse_x,mouse_y)
if button_clicked and not stats.game_active:
#重置游戏设置
ai_settings.initialize_dynamic_settings()
#隐藏光标
pygame.mouse.set_visible(False)
#重置游戏统计信息
stats.reset_stats()
stats.game_active = True
#重置计分图像
sb.prep_score()
sb.prep_high_score()
sb.prep_level()
sb.prep_ships()
#清空外星人列表和子弹列表
aliens.empty()
bullets.empty()
#创建一群新得外星人并让飞船居中
create_fleet(ai_settings,screen,ship,aliens)
ship.center_ship()
def update_screen(ai_settings,screen,stats,sb,ship,aliens,bullets,play_button):
"""更新屏幕上的图像换到新屏幕"""
#每次循环时都重绘屏幕
screen.fill(ai_settings.bg_color)
#在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)
#显示得分
sb.show_score()
#如果游戏处于非活动状态就绘制Play按钮
if not stats.game_active:
play_button.draw_button()
#让最近绘制的屏幕可见
pygame.display.flip()
def update_bullets(ai_settings,screen,stats,sb,ship,aliens,bullets):
"""更新子弹的位置 删除消失的子弹"""
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,stats,sb,ship,
aliens,bullets)
def check_bullet_alien_collisions(ai_settings,screen,stats,sb,ship,
aliens,bullets):
"""响应碰撞"""
# 击中删除
collisions = pygame.sprite.groupcollide(bullets,aliens,True,True)
if collisions:
for aliens in collisions.values():
stats.score += ai_settings.alien_points * len(aliens)
sb.prep_score()
check_high_score(stats,sb)
if len(aliens) == 0:
#全灭后提高一个等级
bullets.empty()
ai_settings.increase_speed()
#提高等级
stats.level += 1
sb.prep_level()
create_fleet(ai_settings,screen,ship,aliens)
def get_number_aliens_x(ai_settings,alien_width):
"""计算每行容纳多少个外星"""
available_space_x = ai_settings.screen_width - 1.5 * alien_width
number_aliens_x = int(available_space_x / (1.5 * alien_width))
return number_aliens_x
def get_number_rows(ai_settings,ship_height,alien_height):
"""计算屏幕容纳几行外星"""
available_space_y = (ai_settings.screen_height -
(3 * alien_height) - ship_height)
number_rows = int(available_space_y / (1.5 * alien_height))
return number_rows
def create_alien(ai_settings,screen,aliens,alien_number,row_number):
"""创建一个外星并将其放在当前行"""
alien = Alien(ai_settings,screen)
alien_width = alien.rect.width
alien.x = alien_width + 1.5 * alien_width * alien_number
alien.rect.x = alien.x
alien.rect.y = alien.rect.height + 1.5 * alien.rect.height * row_number
aliens.add(alien)
def create_fleet(ai_settings,screen,ship,aliens):
#创建外星群
#创建一个外星 计算每行容纳几个
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)
#创建一个外星并将加入当前行
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):
"""有外星人到达边缘时采取相应的措施"""
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 并改变它们的方向"""
for alien in aliens.sprites():
alien.rect.y += ai_settings.fleet_drop_speed
ai_settings.fleet_direction *= -1
def ship_hit(ai_settings,screen,stats,sb,ship,aliens,bullets):
"""响应被外星人撞到的飞船"""
if stats.ships_left > 0:
#将ships_left减1
stats.ships_left -= 1
#更新记分牌
sb.prep_ships()
#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，并将飞船放到屏幕底端中央
create_fleet(ai_settings,screen,ship,aliens)
ship.center_ship()
#暂停
sleep(0.5)
else:
stats.game_active = False
pygame.mouse.set_visible(True)
def check_aliens_bottom(ai_settings,screen,stats,sb,ship,aliens,bullets):
"""检查是否有外星人到达屏幕底端"""
screen_rect = screen.get_rect()
for alien in aliens.sprites():
if alien.rect.bottom >= screen_rect.bottom:
#像飞船一样进行处理
ship_hit(ai_settings,screen,stats,sb,ship,aliens,bullets)
break
def update_aliens(ai_settings,screen,stats,sb,ship,aliens,bullets):
"""检查是否有外星人位于屏幕边缘 并更新整群外星人的位置"""
check_fleet_edges(ai_settings,aliens)
aliens.update()
#检测外星人和飞船之间的碰撞
if pygame.sprite.spritecollideany(ship,aliens):
ship_hit(ai_settings,screen,stats,sb,ship,aliens,bullets)
#检查是否有外星人到达底端
check_aliens_bottom(ai_settings,screen,stats,sb,ship,aliens,bullets)
def check_high_score(stats,sb):
"""检查是否诞生了新的最高分"""
if stats.score > stats.high_score:
stats.high_score = stats.score
sb.prep_high_score()