你错过了在 Surface 缩放后更新 self.pixeltitlerect 的大小:

self.pixeltitle = pg.transform.scale(self.pixeltitle,(xsize,ysize))# 表面的大小已经改变得到新的矩形self.pixeltitlerect = self.pixeltitle.get_rect()self.pixeltitlerect.center = (250,120)self.screen.blit(self.pixeltitle,self.pixeltitlerect)

甚至更短(参见

导入pygamepygame.init()窗口 = pygame.display.set_mode((500, 500))时钟 = pygame.time.Clock()类 ScalingSurface:def __init__(self):name = "pixeltitle.png";self.pixeltitleorig = pg.image.load(name)self.pixeltitle = self.pixeltitleorigself.pixeltitlesize = self.pixeltitle.get_size()self.pixeltitlerect = self.pixeltitle.get_rect()self.pixeltitlerect.center = (250,120)self.mode = '成长'自我成长 = 0定义更新(自我):如果自我成长>40:self.mode = '缩小'如果 self.grow

I am fairly new to pygame and am working on my first game. (So sorry if I'm asking a stupid question) I am trying to get the title of the game to slowly increase and decrease in size like a sort of breathing effect in order to make the home screen more visually appealing.

Here's what I've got to import the image:

name = self.dir_path + "pixeltitle.png"
self.pixeltitle = pg.image.load(name)
self.pixeltitlerect = self.pixeltitle.get_rect()
self.pixeltitlerect.center = (250,120)
self.screen.blit(self.pixeltitle,self.pixeltitlerect)

I've got a while loop in which I'm increasing the size of the rect, however it gets moved over to the right and downwards. Is there any way to increase the size and have the centre of the rect stay in the same place? Also is there a way of making the increase/decrease in size more smooth? Here's the rest of the code:

clicked = False
        grow = 0
        mode = 'grow'
        while not clicked:
            if grow>40:
                mode = 'shrink'
            if grow<1:
                mode = 'grow'
                self.pixeltitle = pg.transform.scale(self.pixeltitle,(400,400))


            if mode == 'grow':
                grow+=1
            else:
                grow-=1

            xsize=400+int(grow)
            ysize=400+int(grow)

            self.pixeltitle = pg.transform.scale(self.pixeltitle,(xsize,ysize))
            self.pixeltitlerect.center = (250,120)
            self.screen.blit(self.pixeltitle,self.pixeltitlerect)
            pg.display.flip()

You missed to update the size of self.pixeltitlerect after the Surface has been scaled:

self.pixeltitle = pg.transform.scale(self.pixeltitle,(xsize,ysize))

# size of surface has been changed get the new rectangle
self.pixeltitlerect = self.pixeltitle.get_rect()

self.pixeltitlerect.center = (250,120)
self.screen.blit(self.pixeltitle,self.pixeltitlerect)

Or even shorter (see pygame.Surface.get_rect()):

self.pixeltitle = pg.transform.scale(self.pixeltitle,(xsize,ysize))
self.pixeltitlerect = self.pixeltitle.get_rect(center = (250,120))
self.screen.blit(self.pixeltitle,self.pixeltitlerect)

Do not scale the original Surface. If the original Surface is scaled it will get distorted. Keep the original image self.pixeltitleorig and scale the original image:

self.pixeltitle = pygame.transform.scale(self.pixeltitleorig,(xsize,ysize))

See also Transform scale and zoom surface

See the example:

import pygame
pygame.init()
window = pygame.display.set_mode((500, 500))
clock = pygame.time.Clock()

class ScalingSurface:
    def __init__(self):
        name = "pixeltitle.png"
        self.pixeltitleorig = pg.image.load(name)
        self.pixeltitle     = self.pixeltitleorig
        self.pixeltitlesize = self.pixeltitle.get_size()
        self.pixeltitlerect = self.pixeltitle.get_rect()
        self.pixeltitlerect.center = (250,120)
        self.mode = 'grow'
        self.grow = 0

    def update(self):
        if self.grow > 40:
            self.mode = 'shrink'
        if self.grow<1:
            self.mode = 'grow'
        self.grow += 1 if self.mode == 'grow' else -1

        xsize = self.pixeltitlesize[0] + round(self.grow)
        ysize = self.pixeltitlesize[1] + round(self.grow)
        self.pixeltitle = pygame.transform.scale(self.pixeltitleorig,(xsize,ysize))
        self.pixeltitlerect = self.pixeltitle.get_rect(center = (250,120))

    def draw(self, surf):
        surf.blit(self.pixeltitle,self.pixeltitlerect)

img = ScalingSurface()
run = True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    window.fill(0)
    img.update()
    img.draw(window)
    pygame.display.flip()