Just define a rect and pass it to pygame.display.update()
to update only this specific region of the display. You can also pass a list of rects.
import random
import pygame as pg
from pygame.math import Vector2
# A simple sprite, just to have something moving on the screen.
class Ball(pg.sprite.Sprite):
def __init__(self, screen_rect):
super().__init__()
radius = random.randrange(5, 31)
self.image = pg.Surface((radius*2, radius*2), pg.SRCALPHA)
pg.draw.circle(self.image, pg.Color('dodgerblue1'), (radius, radius), radius)
pg.draw.circle(self.image, pg.Color('dodgerblue3'), (radius, radius), radius-2)
self.rect = self.image.get_rect(center=screen_rect.center)
self.vel = Vector2(random.uniform(-2, 2), random.uniform(-2, 2))
self.pos = Vector2(self.rect.center)
self.screen_rect = screen_rect
self.lifetime = 350
def update(self):
self.pos += self.vel
self.rect.center = self.pos
self.lifetime -= 1
if not self.screen_rect.contains(self.rect) or self.lifetime <= 0:
self.kill()
def main():
screen = pg.display.set_mode((800, 600))
screen.fill((20, 40, 70))
pg.display.update()
screen_rect = screen.get_rect()
clock = pg.time.Clock()
all_sprites = pg.sprite.Group()
# Pass this rect to `pg.display.update` to update only this area.
update_rect = pg.Rect(50, 50, 500, 400)
done = False
while not done:
for event in pg.event.get():
if event.type == pg.QUIT:
done = True
all_sprites.add(Ball(screen_rect))
all_sprites.update()
screen.fill((20, 50, 90))
all_sprites.draw(screen)
# Update only the area that we specified with the `update_rect`.
pg.display.update(update_rect)
clock.tick(60)
if __name__ == '__main__':
pg.init()
main()
pg.quit()
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