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Engineering LibreTexts

6.19: The Game Over Animation

  • Page ID
  • def gameOverAnimation(color=WHITE, animationSpeed=50):
        # play all beeps at once, then flash the background
        origSurf = DISPLAYSURF.copy()
        flashSurf = pygame.Surface(DISPLAYSURF.get_size())
        flashSurf = flashSurf.convert_alpha() # play all four beeps at the same time, roughly.
        r, g, b = color
        for i in range(3): # do the flash 3 times
            for start, end, step in ((0, 255, 1), (255, 0, -1)):
                # The first iteration in this loop sets the following for loop
                # to go from 0 to 255, the second from 255 to 0.
                for alpha in range(start, end, animationSpeed * step): # animation loop
                    # alpha means transparency. 255 is opaque, 0 is invisible
                    flashSurf.fill((r, g, b, alpha))
                    DISPLAYSURF.blit(origSurf, (0, 0))
                    DISPLAYSURF.blit(flashSurf, (0, 0))

    Each of the iterations of the for loop on the next line will perform a flash. To have three flashes done, we put all of that code in a for loop that has three iterations. If you want more or fewer flashes, then change the integer that is passed to range() on line 11 [222].

    The for loop on line 12 [223] is exactly the same as the one line 173. The start, end, and step variables will be used on the next for loop (on line 13 [224]) to control how the alpha variable changes. Reread the "Animating the Button Flash" section if you need to refresh yourself on how these loops work.

    This animation loop works the same as the previous flashing animation code in the "Animating the Background Change" section. The copy of the original Surface object stored in origSurf is drawn on the display Surface, then flashSurf (which has the new flashing color painted on it) is blitted on top of the display Surface. After the background color is set up, the buttons are drawn on top on line 21 [232]. Finally the display Surface is drawn to the screen with the call to pygame.display.update().

    The for loop on line 15 [226] adjusts the alpha value for the color used for each frame of animation (increasing at first, and then decreasing).