Pygame WINDOWRESIZED黑屏

Question

我正在尝试调整 pygame 中的窗口大小，但只会出现黑屏。请参阅下面的前后图片。我究竟做错了什么？

import pygame as pg
from pygame.locals import *

pg.init()

yellow = (255, 255, 134)
grey = (142, 142, 142)

square_size = 100
width = 7 * square_size
height = 7 * square_size
radius = int(square_size / 2 - 10)

screen = pg.display.set_mode((width, height), RESIZABLE)

screen.fill(grey)

pg.draw.circle(screen,yellow,(square_size,square_size),radius)

pg.display.flip()

while True:
    for ev in pg.event.get():
        if ev.type == pg.QUIT:
            print("quit game")
            pg.quit()
            sys.exit()
        if ev.type == pg.WINDOWRESIZED:
            width, height = screen.get_width(), screen.get_height()
    pg.display.flip()

Answer 1

调整窗口大小后需要重新绘制场景。我建议在每一帧中重新绘制场景。典型的 PyGame 应用程序循环必须：

• 使用pygame.time.Clock.tick 限制每秒帧数以限制 CPU 使用率
• 通过调用pygame.event.pump() 或pygame.event.get() 处理事件。
• 根据输入事件和时间（分别为帧）更新对象的游戏状态和位置
• 清除整个显示或绘制背景
• 绘制整个场景（blit所有对象）
• 调用pygame.display.update()或pygame.display.flip()更新显示

import sys
import pygame as pg
from pygame.locals import *

pg.init()

yellow = (255, 255, 134)
grey = (142, 142, 142)

square_size = 100
width = 7 * square_size
height = 7 * square_size
radius = int(square_size / 2 - 10)

screen = pg.display.set_mode((width, height), RESIZABLE)
clock = pg.time.Clock()

run = True
while run:

    # limit the frames per second 
    clock.tick(100)

    # handle the events
    for ev in pg.event.get():
        if ev.type == pg.QUIT:
            print("quit game")
            run = False
        if ev.type == pg.WINDOWRESIZED:
            width, height = screen.get_width(), screen.get_height()
    
    # clear display
    screen.fill(grey)

    # draw scene
    pg.draw.circle(screen,yellow,(square_size,square_size),radius)

    # update the display
    pg.display.flip()

pg.quit()
sys.exit()