问如何在撞墙后倒置图像

EN

"""
    Author: victor Xu

    Date: January 21st, 2021

    Description: Animating 3 images with background music and 3 sound effects.
"""

import pygame


def main():
    '''This function defines the 'mainline logic' for our game.'''
    # I - INITIALIZE
    pygame.init()

    # DISPLAY
    screen = pygame.display.set_mode((640, 480))
    pygame.display.set_caption("Crazy Shapes Animation")

    # ENTITIES
    background = pygame.Surface(screen.get_size())
    background = background.convert()
    background.fill((255, 255, 255))  # white background

    pygame.mixer.music.load("music.ogg")  # background music
    pygame.mixer.music.set_volume(0.5)
    pygame.mixer.music.play(-1)

    cherry_wav = pygame.mixer.Sound("cherry.wav")
    cherry_wav.set_volume(0.5)  # cherry sfx

    pacman_wav = pygame.mixer.Sound("pacman.wav")
    pacman_wav.set_volume(0.5)  # pacman sfx

    ghost_wav = pygame.mixer.Sound("ghost.wav")
    ghost_wav.set_volume(0.5)  # ghost sfx

    pacman = pygame.image.load("PacMan.png")
    pacman.set_colorkey((0, 0, 0))

    cherry = pygame.image.load("Cherry.png")
    cherry.set_colorkey((0, 0, 0))

    ghost = pygame.image.load("Ghost.png")
    ghost.set_colorkey((0, 0, 0))

    # A - ACTION (broken into ALTER steps)

    # ASSIGN
    clock = pygame.time.Clock()
    keepGoing = True

    pacman_x = 0  # Assign starting (x,y)
    pacman_y = 200  # for our red box
    move_pacman_x = 5

    ghost_x = 300  # Assign starting (x,y)
    ghost_y = 200  # for our green rectangle
    move_ghost_y = 5

    cherry_x = 640  # Assign starting (x,y)
    cherry_y = 0  # for our blue circle
    move_cherry_x = 5
    move_cherry_y = 5

    # LOOP
    while keepGoing:

        # TIMER
        clock.tick(30)

        # EVENT HANDLING
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                keepGoing = False

        # change x coordinate of red box
        pacman_x += move_pacman_x
        # check boundaries, to bounce off wall
        if pacman_x >= screen.get_width():
            pacman_wav.play()
            pacman_x = screen.get_width()
            move_pacman_x *= -1
        if pacman_x <= 0:
            pacman_wav.play()
            pacman_x = 0
            move_pacman_x *= -1

        # change y coordinate of green rectangle
        ghost_y += move_ghost_y
        # check boundaries, to bounce off wall
        if ghost_y >= screen.get_height():
            ghost_wav.play()
            ghost_y = screen.get_height()
            move_ghost_y *= -1
        if ghost_y <= 0:
            ghost_wav.play()
            ghost_y = 0
            move_ghost_y *= -1

        # change x coordinate of blue circle
        cherry_x += move_cherry_x
        # check boundaries, to bounce off wall
        if cherry_x >= screen.get_width():
            cherry_wav.play()
            cherry_x = screen.get_width()
            move_cherry_x *= -1
        if cherry_x <= 0:
            cherry_wav.play()
            cherry_x = 0
            move_cherry_x *= -1

        # change y coordinate of blue circle
        cherry_y += move_cherry_y
        # check boundaries, to bounce off wall
        if cherry_y >= screen.get_height():
            cherry_wav.play()
            cherry_y = screen.get_height()
            move_cherry_y *= -1
        if cherry_y <= 0:
            cherry_wav.play()
            cherry_y = 0
            move_cherry_y *= -1

        # REFRESH (update window)
        screen.blit(background, (0, 0))
        screen.blit(ghost, (ghost_x, ghost_y))  # blit rectangle at new (x,y) location
        screen.blit(pacman, (pacman_x, pacman_y))  # blit box at new (x,y) location
        screen.blit(cherry, (cherry_x, cherry_y))  # blit circle at new (x, y) location
        pygame.display.flip()

    # Close the game window
    pygame.quit()


# Call the main function
main()