[Tutor] Opening a window to fit an image

[James Newton]

Hi Python Pros,

I want to create a window to fit an image that I read in on the fly.
I'm using pygame to load images and to create the window.  I find I have
to use pygame.display.set_mode() twice: once to allow me to use
pygame.image.loadfile(), and once to reset the window size after I have
been able to determine the size of the loaded image.

Does this have any undesired side-effects?  Is there a better way of
doing this?

Here's the relevant extract of my script.


import os
import pygame


def main():
    pygame.init()
    
    # You must use display.set_mode() before you can use image.load
    # If you don't, you get an "error: No video mode has been set"
    screen     = pygame.display.set_mode((1, 1))

    # Now we can load an image file and find out its size
    vFile      = 'image.bmp' # in same folder as script
    background = pygame.image.load(vFile).convert()
    vRect      = background.get_rect()

    # Reset the display mode to fit the image
    screen     = pygame.display.set_mode((vRect[2], vRect[3]))

    # Show the image in the window
    screen.blit(background, (0, 0))
    pygame.display.update()

    # <SNIP: code to make application exit gracefully>

main()


Thanks in advance for your help,

James