How to Eliminate Flickering in PyGame Animations?

Understanding Flickering in PyGame Animations

When executing a PyGame program, you may encounter unwanted visual glitches or flickering. Understanding the cause and addressing it is crucial to ensure smooth gameplay.

In PyGame, each iteration of the game loop involves redrawing all game elements to reflect any changes in their positions or properties. In your case, the flickering occurs because you call pygame.display.update() after drawing the background and after drawing the player. This means the display is updated twice per loop, resulting in a noticeable flicker.

Resolving the Flickering Problem

To eliminate the flickering, modify your code to call pygame.display.update() only once at the very end of the game loop. The modified loop below demonstrates this solution:

<code class="python">while running:
    screen.fill((225, 0, 0))

    # [...]

    player(playerX, playerY)
    pygame.display.update()</code>

This single call to pygame.display.update() effectively updates the entire display after all game elements have been drawn. This eliminates the flickering and ensures a smooth gameplay experience.

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