python - 对为什么 PyGame 显示黑屏感到困惑

Question

所以在我决定问这个问题之前，我做了一些研究以了解我的问题是什么并遇到了这个问题:Code Only Produces Black Screen In Pygame Window但是，这并不是那么有用，因为我没有遇到与此人相同的问题。我肯定知道我的 PyGame 没有过时或类似的东西，因为我的代码以前版本可以正常工作。

每次运行代码时，我都会遇到黑屏。

这是我的代码(有点长抱歉):

import pygame
import sys
from pygame.locals import *

white = (255,255,255)
black = (0,0,0)

objs = []

MAIN_BUTTON = 1

class Pane():

    def __init__(self):
        self.Screen = pygame.display.set_mode((1000,600), 0, 32)
        self.font = pygame.font.SysFont('Arial', 25)

    def drawPane(self, textToDisplay):
        self.Screen.blit(self.font.render(textToDisplay, True, (black)), (250, 115))
        pygame.draw.rect(self.Screen, (black), (175, 75, 200, 100), 2)

    def drawPane1(self, textToDisplay):
        self.Screen.blit(self.font.render(textToDisplay, True, (black)), (250, 115))
        pygame.draw.rect(self.Screen, (black), (175, 75, 200, 100), 2)

    def drawPane2(self, textToDisplay):
        self.Screen.blit(self.font.render(textToDisplay, True, (black)), (250, 115))
        pygame.draw.rect(self.Screen, (black), (175, 75, 200, 100), 2)

    def drawPane3(self, textToDisplay):
        self.Screen.blit(self.font.render(textToDisplay, True, (black)), (250, 115))
        pygame.draw.rect(self.Screen, (black), (175, 75, 200, 100), 2)

    def drawPane4(self, textToDisplay):
        self.Screen.blit(self.font.render(textToDisplay, True, (black)), (250, 115))
        pygame.draw.rect(self.Screen, (black), (175, 75, 200, 100), 2)

    def drawPane5(self, textToDisplay):
        self.Screen.blit(self.font.render(textToDisplay, True, (black)), (250, 115))
        pygame.draw.rect(self.Screen, (black), (175, 75, 200, 100), 2)

    def drawPane6(self, textToDisplay):
        self.Screen.blit(self.font.render(textToDisplay, True, (black)), (250, 115))
        pygame.draw.rect(self.Screen, (black), (175, 75, 200, 100), 2)

    def drawPane7(self, textToDisplay):
        self.Screen.blit(self.font.render(textToDisplay, True, (black)), (250, 115))
        pygame.draw.rect(self.Screen, (black), (175, 75, 200, 100), 2)

    def drawPane8(self, textToDisplay):
        self.Screen.blit(self.font.render(textToDisplay, True, (black)), (250, 115))
        pygame.draw.rect(self.Screen, (black), (175, 75, 200, 100), 2)

    def drawPane9(self, textToDisplay):
        self.Screen.blit(self.font.render(textToDisplay, True, (black)), (250, 115))
        pygame.draw.rect(self.Screen, (black), (175, 75, 200, 100), 2)

class Screen():

    def __init__(self):
        pygame.init()
        self.font = pygame.font.SysFont('Arial', 25)
        pygame.display.set_caption('Box Test')
        self.screen = pygame.display.set_mode((1000,600), 0, 32)
        self.screen.fill((white))
        pygame.display.update()
        numberOfPanes = 0
        self.NoOfPanes = numberOfPanes

    def addPane(self, textToDisplay):
        myPane = Pane()
        myPane.drawPane(textToDisplay)

    def clearScreen(self):
        self.screen = pygame.display.set_mode((600,400), 0, 32)
        self.screen.fill((white))
        pygame.display.update()

    def mousePosition(self):
        global clickPos
        global releasePos
        for event in pygame.event.get():
            if event.type == MAIN_BUTTON:
                self.Pos = pygame.mouse.get_pos()
                return MAIN_BUTTON
            else:
                return False


if __name__ == '__main__':
    Pan3 = Screen()
    Pan3.addPane("hello")
    Pan3.mousePosition()
    pygame.display.update()
    while True:
        ev = pygame.event.get()
        for event in ev:
            if event.type == pygame.MOUSEBUTTONUP:
                posx,posy = pygame.mouse.get_pos()
                print(posx)
                print(posy)


        for event in pygame.event.get():        
            if event.type == pygame.QUIT:
                pygame.quit(); sys.exit();

所以我基本上是在尝试在 **class Screen()** 中显示来自 **class Pane()** 的 Pane (现在是一个)但是就像我之前说的那样，当我运行代码时出现黑屏。但出于某种原因，鼠标坐标跟踪器仍然有效。非常感谢任何帮助。

Answer 1

问题出在您的代码组织上。

你有树时间 pygame.display.set_mode()。每次调用 pygame.display.set_mode() 时，您都会破坏之前的 screen，创建新的 screen 并且新屏幕始终为黑色。

您应该只创建一次screen并将其作为参数发送给其他类。

def addPane(self, textToDisplay):
    myPane = Pane(self.screen) # send screen to Pane
    myPane.drawPane(textToDisplay)

# ...

class Pane():

    def __init__(self, screen):
        self.Screen = screen # get screen 

并从 clear() 函数中删除 pygame.display.set_mode() - 在程序结束时使用一个屏幕。

现在我可以看到带有“你好”的 Pane