python - 带有鼠标事件的 Pygame blit 图像

Question

我在此代码中使用了 Pygame。这就像一个游戏，当用户点击鼠标按钮时，鼠标位置会出现一个激光图像，该图像会上升，并最终离开屏幕。当用户点击鼠标按钮时，我试图 blit 图像。我正在使用的这段代码不起作用，我不知道为什么。我的问题从主 for 循环开始

    import pygame

    # Initialize Pygame
    pygame.init()

    #___GLOBAL CONSTANTS___
    # Define some colors
    BLACK = (0, 0, 0)
    WHITE = (255, 255, 255)
    GREEN = (0, 255, 0)
    RED = (255, 0, 0)


    # Set the height and width of the screen
    screen_width = 500
    screen_height = 500
    screen = pygame.display.set_mode([screen_width, screen_height])


    #Load Laser image of spaceship
    laser_image = pygame.image.load('laserRed16.png').convert()


    #Load sound music
    sound = pygame.mixer.Sound('laser5.ogg')


    # Loop until the user clicks the close button.
    done = False

    # Used to manage how fast the screen updates
    clock = pygame.time.Clock()


    # -------- Main Program Loop -----------
    while not done:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                done = True
            elif event.type == pygame.MOUSEBUTTONDOWN:
                # Get the current mouse position. This returns the position
                # as a list of two numbers.
                sound.play()
                #Get the mouse position 
                mouse_position = pygame.mouse.get_pos()
                mouse_x = mouse_position[0]
                mouse_y = mouse_position[1]
                # Set the laser image when the spaceship fires
                for i in range(50):
                    screen.blit(laser_image,[mouse_x + laser_x_vector,mouse_y + laser_x_vector])
                    laser_x_vector += 2
                    laser_x_vector += 2


        # Clear the screen
        screen.fill(WHITE)

        #Limit to 20 sec
        clock.tick(20)

        # Go ahead and update the screen with what we've drawn.
        pygame.display.flip()
pygame.quit()

Answer 1

在你 blit the lazer 之后你填满了屏幕，所以 lazer 不会出现。你应该在你 blit the lazer 之前填充，这样 lazer 就会出现。