Pygame crashes after only a few seconds of rendering my code

Question

For some reason, this program crashes after only a second or so of running this. Funnily enough, changing the turnAngle or fps affects how long it lasts before crashing. The error it throws is a ValueError: subsurface rectangle outside of surface area on line 29 / line 9. Any ideas?

import pygame as pg


def rot_center(image, angle):
    orig_rect = image.get_rect()
    rot_image = pg.transform.rotate(image, angle)
    rot_rect = orig_rect.copy()
    rot_rect.center = rot_image.get_rect().center
    rot_image = rot_image.subsurface(rot_rect).copy()
    return rot_image


pg.init()

mainDisplay = pg.display.set_mode([600, 376])

imgSplashBG = pg.image.load('guiAssets/splash/BG.png')
imgSplashFG = pg.image.load('guiAssets/splash/FG.png')
imgSplashRedCircle = pg.image.load('guiAssets/splash/redCircle.png')
imgSplashGreenCircle = pg.image.load('guiAssets/splash/greenCircle.png')

turnAngle = 10

frame = 0
clock = pg.time.Clock()
crashed = False
while not crashed:
    frame += 1
    mainDisplay.blit(imgSplashBG, (0, 0))
    mainDisplay.blit(rot_center(imgSplashGreenCircle, ((frame % 360) * 10)), (-189, -189))
    mainDisplay.blit(rot_center(imgSplashRedCircle, ((frame % 360) * 10)), (453, 230))
    mainDisplay.blit(imgSplashFG, (0, 0))
    pg.display.flip()
    clock.tick(30)

No, that answer doesn't really apply to my code. This is actually super confusing to me. — LetsdothisEpic, Nov 22 '20 at 03:39

score 0 · Answer 1 · answered Nov 22 '20 at 03:10

0

Can you try to add a time variable before your loop 'while not'

Like this :

.....
frame = 0
clock = pg.time.Clock()
time = pg.time.get_ticks()      #here
crashed = False
while not .....

answered Nov 22 '20 at 03:10

Toykato

89
5

I went ahead and added that line, but it still crashes. – LetsdothisEpic Nov 22 '20 at 03:29

Rabbid76 · Accepted Answer · 2020-11-22T07:18:52.043

See How do I rotate an image around its center using PyGame?

Furthermore you have to handle the events in the application loop. See pygame.event.get() respectively pygame.event.pump():

For each frame of your game, you will need to make some sort of call to the event queue. This ensures your program can internally interact with the rest of the operating system.

For instance:

import pygame as pg

def rot_center(image, angle, center):
    rotated_image = pg.transform.rotate(image, angle)
    new_rect = rotated_image.get_rect(center = center)
    return rotated_image, new_rect

pg.init()
mainDisplay = pg.display.set_mode([600, 376])

imgSplashBG = pg.image.load('guiAssets/splash/BG.png')
imgSplashFG = pg.image.load('guiAssets/splash/FG.png')
imgSplashRedCircle = pg.image.load('guiAssets/splash/redCircle.png')
imgSplashGreenCircle = pg.image.load('guiAssets/splash/greenCircle.png')

turnAngle = 10
frame = 0

clock = pg.time.Clock()
run = True
crashed = False
while not crashed and run:

    for event in pg.event.get():
        if event.type == pg.QUIT:
            run = False

    frame += 1
    angle = (frame*turnAngle) % 360
    centerGreen = (189, 189)
    centerRed = (453, 230)

    mainDisplay.blit(imgSplashBG, (0, 0))
    mainDisplay.blit( *rot_center(imgSplashGreenCircle, angle, centerGreen) )
    mainDisplay.blit( *rot_center(imgSplashRedCircle, angle,centerRed) )
    mainDisplay.blit(imgSplashFG, (0, 0))
    pg.display.flip()
    clock.tick(30)

pygame.quit()

Incredible! I have no idea why but that completely fixed the problem. I can't believe I forgot to add that. — LetsdothisEpic, Nov 23 '20 at 03:44

Pygame crashes after only a few seconds of rendering my code

2 Answers2