Pygame. How do I resize a surface and keep all objects within proportionate to the new window size?

Question

If I set a pygame window to resizable and then click and drag on the border of the window the window will get larger but nothing blit onto the surface will get larger with i

Answer 1

Don't draw on the screen directly, but on another surface. Then scale that other surface to size of the screen and blit it on the screen.

Here's a simple example:

import pygame
from pygame.locals import *

def main():
    pygame.init()
    screen = pygame.display.set_mode((200, 200),HWSURFACE|DOUBLEBUF|RESIZABLE)
    fake_screen = screen.copy()
    pic = pygame.surface.Surface((50, 50))
    pic.fill((255, 100, 200))

    while True:
        for event in pygame.event.get():
            if event.type == QUIT: 
                pygame.display.quit()
            elif event.type == VIDEORESIZE:
                screen = pygame.display.set_mode(event.size, HWSURFACE|DOUBLEBUF|RESIZABLE)

        fake_screen.fill('black')
        fake_screen.blit(pic, (100, 100))
        screen.blit(pygame.transform.scale(fake_screen, screen.get_rect().size), (0, 0))
        pygame.display.flip()
    
main()    

Answer 2

Recently with pygame2.0 You can use the SCALED flag

Answer 3

so without the gui initialization (pygame init, and setmode comands ) in the section where you have existing pygame event get()(which your only allowed one time (or just put in ''for inkey in pygame.event.get(VIDEORESIZE):''( if you want to be redundant))(note you can only use ''for inkey in pygame.event.get(VIDEORESIZE):'' one time per loop because it is really a stack that unstacks when you read the event list so you should really use ''for inkey in pygame.event.get():'' snd put all your key recognission statements after this one occurrance of ''for inkey in pygame.event.get():'':

for inkey in pygame.event.get(VIDEORESIZE)
    if inkey.type == pygame.VIDEORESIZE:
        winwidth,winhight  = inkey.size  # or event.w, event.h
        Window1copy = Window1.copy()# make copy of existing window
        Window1=pygame.display.set_mode((winwidth,winhight),pygame.RESIZABLE) 
        Window1.blit(Window1copy, (0, 0))
        pygame.display.update()