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Understanding Ball Movement in Pygame
When developing a pong game in Pygame, it's crucial to comprehend why the ball stretches instead of moving smoothly. Let's delve into the provided code to unravel the cause.
Analysis of the Code
The problem lies in the absence of a vital step in the code: clearing the display surface before drawing each frame. Without this step, the ball's position is updated, but the previous frame's drawing remains on the display, resulting in the ball stretching effect.
Solution: Clearing the Display
To address this issue, the display surface must be cleared at the start of every frame. Insert the line screen.fill(0) into the code before drawing elements, as shown below:
while True: # [...] # Clear the display surface screen.fill(0) main.draw_elements() main.move_ball() main.ball.x_pos += main.ball.speed pygame.display.flip() # [...]
Explanation
In Pygame, every frame is drawn onto the display surface. To prevent the accumulation of previous drawings, it's essential to clear the surface before each frame. This ensures that only the current frame's objects are displayed.
PyGame Application Loop
The typical Pygame application loop typically consists of the following key steps:
By incorporating these steps, developers can ensure smooth movement and object rendering in their Pygame applications.
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