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89 lines
2.7 KiB
Python
89 lines
2.7 KiB
Python
import sys
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import pygame
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from settings import Settings
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from ship import Ship
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from bullet import Bullet
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from pygame.sprite import Group
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class AlienInvasion:
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"""Overall class to manage game assets and behavior."""
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def __init__(self):
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pygame.init()
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self.clock = pygame.time.Clock()
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self.settings = Settings()
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self.screen = pygame.display.set_mode((0,0), pygame.FULLSCREEN)
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self.settings.screen_width = self.screen.get_rect().width
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self.settings.screen_height = self.screen.get_rect().height
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pygame.display.set_caption("Alien Invasion")
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self.bg_color = self.settings.bg_color
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self.ship = Ship(self)
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self.bullets = Group()
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def run_game(self):
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"""Start the main loop for the game."""
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while True:
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# Check for events and update the game state.
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self._check_events()
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self.ship.update()
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self._update_bullets()
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# Redraw the screen during each pass through the loop.
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self._update_screen()
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self.clock.tick(60)
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def _check_events(self):
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"""Respond to keypresses and mouse events."""
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for event in pygame.event.get():
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if event.type == pygame.QUIT:
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sys.exit()
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elif event.type == pygame.KEYDOWN:
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self._check_keydown_events(event)
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elif event.type == pygame.KEYUP:
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self._check_keyup_events(event)
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def _check_keydown_events(self, event):
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"""Respond to key presses."""
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if event.key == pygame.K_RIGHT:
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self.ship.moving_right = True
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elif event.key == pygame.K_LEFT:
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self.ship.moving_left = True
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elif event.key == pygame.K_q:
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sys.exit()
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elif event.key == pygame.K_SPACE:
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self._fire_bullet()
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def _check_keyup_events(self, event):
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"""Respond to key releases."""
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if event.key == pygame.K_RIGHT:
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self.ship.moving_right = False
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elif event.key == pygame.K_LEFT:
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self.ship.moving_left = False
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def _fire_bullet(self):
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"""Fire a bullet if the limit is not reached."""
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if len(self.bullets) < self.settings.bullets_allowed:
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# Create a new bullet and add it to the bullets group.
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new_bullet = Bullet(self)
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self.bullets.add(new_bullet)
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def _update_bullets(self):
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"""Update position of bullets and remove old bullets."""
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self.bullets.update()
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for bullet in self.bullets.copy():
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if bullet.rect.bottom <= 0:
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self.bullets.remove(bullet)
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def _update_screen(self):
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"""Update images on the screen and flip to the new screen."""
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self.screen.fill(self.bg_color)
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for bullet in self.bullets.sprites():
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bullet.draw_bullet()
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self.ship.blitme()
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pygame.display.flip()
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if __name__ == '__main__':
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# Make a game instance and run the game.
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ai = AlienInvasion()
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ai.run_game()
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