如何相对于其中心缩放 PyGame 图像（表面）？

Question

我是 pygame 的新手，正在开发我的第一款游戏。 （很抱歉，如果我问了一个愚蠢的问题） 我试图让游戏的标题像一种呼吸效果一样缓慢增大和减小尺寸，以使主屏幕在视觉上更具吸引力。

这是我必须导入图像的内容：

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)

我有一个 while 循环，在这个循环中我增加了矩形的大小，但是它向右和向下移动。有什么办法可以增加尺寸并让矩形的中心保持在同一个地方？还有没有办法使尺寸的增加/减少更平滑？这是代码的其余部分：

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()

Answer 1

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))

# 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)

或更短（见

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)

---

不要缩放原来的Surface。如果缩放原始表面，它会变形。保留原图

self.pixeltitleorig

，缩放原图：

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

另见变换比例和缩放表面

看例子：

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()