非常简单的PyGame非常慢

Question

I want to make a (a bit bigger) game in PyGame, but even with this simple code I just get arround 10 fps instead of 60? Here's the code:

import pygame

res = 1280,720
display = pygame.display.set_mode(res, pygame.RESIZABLE)
pygame.display.set_caption("Test")


background = pygame.transform.smoothscale(pygame.image.load("Background.png"), res)
a = 0
while True:
    pygame.time.Clock().tick(60)
    display.fill((0,0,0))
    a += 10

    display.blit(background, (0,0)) #Without this line: arround 20 fps

    pygame.draw.rect(display,(255,0,0), (a,8,339,205))

    pygame.display.update()

pygame.quit()

What am I doing wrong?

Thank you!

Answer 1

Try the following optimizations:

• Use the convert() method on your image pygame.image.load("Background.png").convert() ). This makes the animation about 5 times faster.

• Instead of re-blitting entire background every frame, only update the changed parts of the screen.

• You don't need to clear the screen before drawing the background.

• Use the same Clock instance every frame.

Here's the code:

import pygame

pygame.init()
res = (1280, 720)
display = pygame.display.set_mode(res, pygame.RESIZABLE)
pygame.display.set_caption("Test")

background = pygame.transform.smoothscale(pygame.image.load(r"E:\Slike\Bing\63.jpg").convert(), res)
a = 0
clock = pygame.time.Clock()

display.blit(background, (0, 0))
pygame.display.update()
while True:
    clock.tick(60)
    rect = (a,8,339,205)
    display.blit(background, rect, rect) # draw the needed part of the background
    pygame.display.update(rect) # update the changed area
    a += 10
    rect = (a,8,339,205)
    pygame.draw.rect(display, (255,0,0), rect)
    pygame.display.update(rect) # update the changed area