Shulou(Shulou.com)06/01 Report--

This article mainly introduces "Python how to achieve the effect of driving a spaceship to the right continuously in the game". In daily operation, I believe many people have doubts about how to drive a spaceship in the game to the right. The editor consulted all kinds of data and sorted out a simple and easy-to-use method of operation. I hope it will be helpful for everyone to answer the question of "how to achieve the effect of driving a spaceship to the right continuously in the game by Python". Next, please follow the editor to study!

Usage analysis

When the player presses the right arrow key, we want the ship to keep moving to the right until the player releases it. We will have the game detect pygame.KEYUP events so that we know this when the player releases the right arrow key; then we will use a combination of KEYDOWN and KEYUP events, along with a flag called moving_right, to achieve continuous movement.

When the spacecraft is not moving, the flag moving_right will be False. When the player presses the right arrow key, we set the flag to True, and when the player releases it, we reset the flag to False.

The properties of the ship are controlled by the Ship class, so we will add a property named moving_right and a method named update () to this class. The method update () checks the status of the flag moving_right, and if the flag is True, adjust the position of the ship. We call this method whenever we need to adjust the position of the ship.

Code example

# =

# function: shipclass # author: brother python

# time: 2020-7-10

# Wechat official account: DJXY00001

# Wechat name: Python Promotion Class

# Version:1.0

# = class Ship (): def _ _ init__ (self Screen):-- snip-- # place each new ship in the center at the bottom of the screen self.rect.centerx = self.screen_rect.centerx self.rect.bottom = self.screen_rect.bottom # ❶ self.moving_right = False ❷ def update (self): "adjust the position of the ship according to the movement sign" if self.moving_right: Self.rect.centerx + = 1 def blitme (self):-- snip--

In the method _ _ init__ (), we add the property self.moving_right and set its initial value to False (see ❶). Next, we add the method update (), which moves the ship to the right when the aforementioned flag is True (see ❷).

Let's modify check_events () so that it sets moving_right to True when the player presses the right arrow key and moving_right to False when the player releases:

# =

# function: game_functions class # author: brother python

# time: 2020-7-10

# Wechat official account: DJXY00001

# Wechat name: Python Promotion Class

# Version:1.0

# = def check_events (ship): "" respond to buttons and mouse events "" for event in pygame.event.get ():-- snip-- elif event.type = = pygame.KEYDOWN: if event.key = = pygame.K_RIGHT: # modify the right moving spaceship flag bit ❶ ship.moving_right = True ❷ elif event .type = = pygame.KEYUP: if event.key = = pygame.K_RIGHT: ship.moving_right = False

At ❶, we changed the way the game responds when the player presses the right arrow key: instead of directly adjusting the position of the ship, we just set moving_right to True. At ❷, we added a new block of elif code in response to the KEYUP event: when the player released the right arrow key (K_RIGHT), we set moving_right to False.

Finally, we need to modify the while loop in alien_invasion.py so that each time the loop is executed, the spaceship's method update () is called:

# =

# function: alien_invasion class # author: brother python

# time: 2020-7-10

# Wechat official account: DJXY00001

# Wechat name: Python Promotion Class

# Version:1.0

# = = # start the main cycle of the game while True: gf.check_events (ship) ship.update () gf.update_screen (ai_settings, screen, ship). This is the end of the study on "how Python can achieve the effect of driving a spaceship to the right continuously in the game". I hope it can solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.