Resizable Window

import pygame
import sys

# Initialize Pygame
pygame.init()

# Set initial window dimensions
initial_width = 800
initial_height = 600

# Create the window with RESIZABLE flag
screen = pygame.display.set_mode(
    (initial_width, initial_height),
    pygame.RESIZABLE
)
pygame.display.set_caption("Resizable Window Example")

# Main loop
running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

        # Handle window resize event
        elif event.type == pygame.VIDEORESIZE:
            # Update screen surface with new dimensions
            screen = pygame.display.set_mode(
                (event.w, event.h),
                pygame.RESIZABLE
            )

    # Clear screen with white color
    screen.fill((255, 255, 255))

    # Draw elements that adapt to window size
    current_width, current_height = screen.get_size()

    # Draw a centered rectangle that's 80% of window size
    rect_width = current_width * 0.8
    rect_height = current_height * 0.8
    rect = pygame.Rect(
        (current_width - rect_width) // 2,
        (current_height - rect_height) // 2,
        rect_width,
        rect_height
    )
    pygame.draw.rect(screen, (0, 0, 255), rect, 5)

    # Draw text that scales with window size
    font_size = int(min(current_width, current_height) * 0.1)
    font = pygame.font.Font(None, font_size)
    text = font.render("Resize Window!", True, (255, 0, 0))
    text_rect = text.get_rect(center=(current_width//2, current_height//4))
    screen.blit(text, text_rect)

    # Update the display
    pygame.display.flip()

# Clean up
pygame.quit()
sys.exit()