Python 如何在pygame中清除屏幕？
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How to clear up screen in pygame?
提问by user3219116
My friends and I are making a quiz game in PyGame and would like to know how, when the user presses a button, he can go to next question (without leaving the previous text behind).
我和我的朋友正在 PyGame 中制作一个问答游戏，想知道当用户按下按钮时，他如何可以转到下一个问题（不留下之前的文本）。
回答by pathunstrom
In your game loop, before drawing the new frame, fill the frame with the background color.
在您的游戏循环中，在绘制新框架之前，用背景颜色填充框架。
Example:
例子：
ball = pygame.Rect(0,0,10,10)
while True:
mainSurface.fill((0,0,0))
pygame.draw.circle(display,(255,255,255),ball.center,5)
ball.move_ip(1,1)
pygame.display.update()
The key point is the mainSurface.fill which will clear the previous frame.
关键点是 mainSurface.fill，它将清除前一帧。
回答by PythonNovice
First of all I would suggest that you go to the PyGame documentation and read up a little about PyGame. (Link)
首先，我建议您访问 PyGame 文档并阅读一些有关 PyGame 的信息。(链接)
However to save you time what you have to do is before you draw your new set of shapes/writings on the screen you have to use the function screen.fill(#Your chosen colour). That is the function in PyGame that gets rid of the old screen and allows you to draw new items on to a clear screen without the pervious drawings left on there.
但是，为了节省您的时间，您必须在屏幕上绘制一组新的形状/文字之前使用该功能screen.fill(#Your chosen colour)。这就是 PyGame 中的功能，它摆脱了旧屏幕，并允许您在清晰的屏幕上绘制新项目，而不会在那里留下以前的图纸。
Example:
例子：
import pygame
import sys
from pygame.locals import *
white = (255,255,255)
black = (0,0,0)
red = (255, 0, 0)
class Pane(object):
def __init__(self):
pygame.init()
self.font = pygame.font.SysFont('Arial', 25)
pygame.display.set_caption('Box Test')
self.screen = pygame.display.set_mode((600,400), 0, 32)
self.screen.fill((white))
pygame.display.update()
def addRect(self):
self.rect = pygame.draw.rect(self.screen, (black), (175, 75, 200, 100), 2)
pygame.display.update()
def addText(self):
self.screen.blit(self.font.render('Hello!', True, black), (200, 100))
pygame.display.update()
def addText2(self):
self.screen.blit(self.font.render('Hello!', True, red), (200, 100))
pygame.display.update()
def functionApp(self):
if __name__ == '__main__':
self.addRect()
self.addText()
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit(); sys.exit();
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_ESCAPE:
self.screen.fill(white)
self.addRect()
self.addText2() #i made it so it only changes colour once.
display = Pane()
display.functionApp()
