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This article mainly explains how to add spaceship images in the development of Python alien invasion games. The explanation in this article is simple and clear and easy to learn and understand. Please follow Xiaobian's train of thought to study and learn how to add spaceship images in the development of Python alien invasion games.

Usage analysis

Next, add the spaceship to the game. To draw the player's ship on the screen, we will load an image and draw it using the Pygame method blit ().

After selecting the image used to represent the spacecraft, you need to display it on the screen. We will create a module called ship, which contains the Ship class, which manages most of the behavior of the ship.

Code example

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# function: ship class import pygameclass Ship (): def _ _ init__ (self Screen): "" initialize the spaceship and set its initial position "" self.screen = screen # load the spaceship image and get its outer rectangle ❶ self.image = pygame.image.load ('images/ship.bmp') ❷ self.rect = self.image.get_rect () ❸ self.screen_rect = screen.get_rect () # place each new spaceship in the center at the bottom of the screen ❹ self.rect.centerx = self.screen_rect.centerx self.rect.bottom = self.screen_rect.bottom ❺ def blitme (self): "draw the spaceship at the specified location" self.screen.blit (self.image) Self.rect)

First, we imported the module pygame. Ship's method _ _ init__ () takes two parameters: reference self and screen, where the latter specifies where to draw the spaceship. To load the image, we called pygame.image.load () (see ❶). This function returns a surface that represents the spaceship, and we store this surface in self.image.

After loading the image, we use get_rect () to get the property rect of the corresponding surface (see ❷)

We will put the ship in the middle of the bottom of the screen. To do this, first store the rectangle representing the screen in self.screen_rect (see ❸), and then set self.rect.centerx (the x coordinate of the center of the spacecraft) to the property centerx that represents the rectangle of the screen (see ❹).

At ❺, we define the method blitme (), which draws the image to the screen according to the location specified by self.rect.

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# function: alien_invasion class import sysimport pygamefrom settings import Settingsfrom ship import Shipdef run_game (): # initialize the game and create a screen object pygame.init () ai_settings = Settings () screen = pygame.display.set_mode ((ai_settings.screen_width) Ai_settings.screen_height)) pygame.display.set_caption ("alien invasion") # create a spaceship ship = Ship (screen) # start the main cycle of the game while True: # monitor keyboard and mouse events for event in pygame.event.get (): if event.type = = pygame.QUIT: sys.exit () # redraw the screen screen.fill (ai_settings.bg_color) ship.blitme () in each loop # make the recently drawn screen visible to pygame.display.flip () run_game ()

We import the Ship class and create an instance of Ship named ship after creating the screen. The instance must be created in front of the main while loop (see line 12 of the program ship = Ship (screen)) to avoid creating a spaceship for each loop. After filling the background, we call ship.blitme () to draw the spaceship to the screen and make sure it appears in front of the background (see line 21 of the program, ship.blitme ()).

Code run output:

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