Allowing resizing window pyGame

Question

I am trying to allow resizing for this app, I put the RESIZABLE flag, but when I try to resize, it messes up! Try my code.

It is a grid program, when the window resizes I want the grid to also resize/shrink.

import pygame,math from pygame.locals import * # Define some colors black    = (   0,   0,   0) white    = ( 255, 255, 255) green    = (   0, 255,   0) red      = ( 255,   0,   0)  # This sets the width and height of each grid location width=50 height=20 size=[500,500] # This sets the margin between each cell margin=1   # Initialize pygame pygame.init()  # Set the height and width of the screen  screen=pygame.display.set_mode(size,RESIZABLE)  # Set title of screen pygame.display.set_caption("My Game")  #Loop until the user clicks the close button. done=False  # Used to manage how fast the screen updates clock=pygame.time.Clock()  # -------- Main Program Loop ----------- while done==False:     for event in pygame.event.get(): # User did something         if event.type == pygame.QUIT: # If user clicked close             done=True # Flag that we are done so we exit this loop         if event.type == pygame.MOUSEBUTTONDOWN:             height+=10      # Set the screen background     screen.fill(black)      # Draw the grid     for row in range(int(math.ceil(size[1]/height))+1):         for column in range(int(math.ceil(size[0]/width))+1):             color = white             pygame.draw.rect(screen,color,[(margin+width)*column+margin,(margin+height)*row+margin,width,height])      # Limit to 20 frames per second     clock.tick(20)      # Go ahead and update the screen with what we've drawn.     pygame.display.flip() # Be IDLE friendly. If you forget this line, the program will 'hang' # on exit. pygame.quit () 

Please tell me whats wrong, thanks.

Answer 1

The answer for this problem (allow the Pygame window and the surface inside it to resize) is simply to recreate the resizable window with an updated size, when the user changes its dimensions (done on pygame.VIDEORESIZE events).

>>> import pygame >>> help(pygame.display.set_mode) Help on built-in function set_mode in module pygame.display:  set_mode(...)     set_mode(size=(0, 0), flags=0, depth=0, display=0, vsync=0) -> Surface     Initialize a window or screen for display >>>  

This removes all previous content on the window surface, so below
there's a process to continue with the current window content.

Some example code:

import pygame, sys  pygame.init() # Create the window, saving it to a variable. surface = pygame.display.set_mode((350, 250), pygame.RESIZABLE) pygame.display.set_caption("Example resizable window")  while True:     surface.fill((255,255,255))      # Draw a red rectangle that resizes with the window.     pygame.draw.rect(surface, (200,0,0), (surface.get_width()/3,       surface.get_height()/3, surface.get_width()/3,       surface.get_height()/3))      pygame.display.update()     for event in pygame.event.get():         if event.type == pygame.QUIT:             pygame.quit()             sys.exit()         if event.type == pygame.KEYDOWN:             if event.key == pygame.K_ESCAPE:                 pygame.quit()                 sys.exit()          if event.type == pygame.VIDEORESIZE:             # There's some code to add back window content here.             surface = pygame.display.set_mode((event.w, event.h),                                               pygame.RESIZABLE) 

How to continue with the current window content:
Here's some steps to add back the previous window content:

1. make a second variable, set to the value of the old window surface variable.
2. create the new window, storing it as the old variable.
3. draw the second surface onto the first one (old variable) - use the blit function.
4. use this variable and delete the new variable (optional, use del) to not use extra memory.

Some example code for the above steps (replaces pygame.VIDEORESIZE event if statement):

        if event.type == pygame.VIDEORESIZE:             old_surface_saved = surface             surface = pygame.display.set_mode((event.w, event.h),                                               pygame.RESIZABLE)             # On the next line, if only part of the window             # needs to be copied, there's some other options.             surface.blit(old_surface_saved, (0,0))             del old_surface_saved