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In Pygame, it's common to want to execute multiple tasks simultaneously. However, a common issue arises when attempting to run multiple while loops concurrently, as one loop might block others from executing. This article addresses this challenge and provides solutions to enable multiple loops to run smoothly.
In the provided code snippet, two while loops are used:
The issue occurs because the second loop contains a blocking operation (time.sleep()). This prevents the main event processing loop from running, potentially causing the program to become unresponsive.
Replacing the blocking time.sleep() method with Pygame's time measurement system addresses the issue. Pygame provides a function, pygame.time.get_ticks(), which returns the number of milliseconds since Pygame's initialization. By using this function, it's possible to calculate and track the time intervals for the face update loop without blocking the other loops.
Here's a modified version of the code that employs these solutions:
<code class="python">import random import pygame import pygame.freetype # Initialize pygame and game variables face = ['^-^', '^v^', '◠◡◠', "'v'", '⁀◡⁀'] faceDisplay = pygame.freetype.Font('unifont.ttf', 100).render(random.choice(face), 1, (0, 255, 0)) screen = pygame.display.set_mode((800, 600)) run = True # Variable used to track next face update time next_render_time = 0 # Main game loop while run: # Handle events (quit, keyboard input, etc.) for event in pygame.event.get(): if event.type == pygame.QUIT: run = False # Calculate current time current_time = pygame.time.get_ticks() # Check if enough time has passed since the last face update if current_time >= next_render_time: # Update the displayed face and calculate the next update time faceDisplay = pygame.freetype.Font('unifont.ttf', 100).render(random.choice(face), 1, (0, 255, 0)) next_render_time = current_time + random.randint(5, 10) * 1000 # Generate random time interval # Clear the screen, draw the updated face, and flip the display screen.fill((0, 0, 0)) screen.blit(faceDisplay, (screen.get_width() // 2, screen.get_height() // 2)) pygame.display.flip()</code>
By utilizing Pygame's time measurement system, this modified code allows the main event processing loop and the face update loop to operate concurrently without any interruptions.
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