每次 Python Pygame 文本叠加打印在其自身之上

Question

我目前想使用一段名为 python slideshow with time and weather (github) 的旧 Python 代码。我正在使用 Raspberry Pi，我已经完成了所有设置，并且它在横向(正常)模式下完美运行。这是一个幻灯片应用程序，它具有在 Pygame 上开发的天气和时间叠加层。

我想以纵向方式使用该应用程序，但是当我使用 display_rotate=1(或 3)在/boot/config.txt 中旋转我的屏幕并重新启动幻灯片放映时，一切似乎都正常，天气叠加层出现在左下角/右下角应该是这样，但是一旦天气或时钟或日期的任何部分更新，它就会在自身上打印文本。

有没有人知道可能导致这种行为的原因？我在代码中看不到任何内容。下面是来自 Git 的 python 文件，我附上了奇怪行为的屏幕截图[图像显示此实例中时钟中的文本覆盖问题 ][1] : Python slideshow with time and weather on github

 #!/usr/bin/env python
    """
    A pygame program to show a slideshow of all images buried in a given directory.
    Originally Released: 2007.10.31 (Happy halloween!)
    """
    from __future__ import division
    import argparse
    import os
    import stat
    import sys
    import time
    import datetime


    import pygame
    from pygame.locals import QUIT, KEYDOWN, K_ESCAPE


    #weather
    import pyowm



    file_list = []  # a list of all images being shown
    title = "pgSlideShow | My Slideshow!"  # caption of the window...
    waittime = 5   # default time to wait between images (in seconds)


    def walktree(top, callback):
        """recursively descend the directory tree rooted at top, calling the
        callback function for each regular file. Taken from the module-stat
        example at: http://docs.python.org/lib/module-stat.html
        """
        for f in os.listdir(top):
            pathname = os.path.join(top, f)
            mode = os.stat(pathname)[stat.ST_MODE]
            if stat.S_ISDIR(mode):
                # It's a directory, recurse into it
                walktree(pathname, callback)
            elif stat.S_ISREG(mode):
                # It's a file, call the callback function
                callback(pathname)
            else:
                # Unknown file type, print a message
                print 'Skipping %s' % pathname


    def addtolist(file, extensions=['.png', '.jpg', '.jpeg', '.gif', '.bmp']):
        """Add a file to a global list of image files."""
        global file_list  # ugh
        filename, ext = os.path.splitext(file)
        e = ext.lower()
        # Only add common image types to the list.
        if e in extensions:
            print 'Adding to list: ', file
            file_list.append(file)
        else:
            print 'Skipping: ', file, ' (NOT a supported image)'


    def input(events):
        """A function to handle keyboard/mouse/device input events. """
        for event in events:  # Hit the ESC key to quit the slideshow.
            if (event.type == QUIT or
                (event.type == KEYDOWN and event.key == K_ESCAPE)):
                pygame.quit()


    def timeSince(lastTime,interval):
        if (time.time() - lastTime)>=interval:
            return True
        else:
            return False


    def main(startdir="."):
        global file_list, title, waittime
        lastSwitch=time.time()
        lastWeather=time.time()

        owm = pyowm.OWM('4cc9ae1d116c7e70c145252ab605f260')
        observation = owm.weather_at_place('Ottawa,CA')
        w = observation.get_weather()
        temperature=(w.get_temperature('celsius'))['temp']
        status=w.get_status()
        #print w

        pygame.init()

        # Test for image support
        if not pygame.image.get_extended():
            print "Your Pygame isn't built with extended image support."
            print "It's likely this isn't going to work."
            sys.exit(1)

        walktree(startdir, addtolist)  # this may take a while...
        if len(file_list) == 0:
            print "Sorry. No images found. Exiting."
            sys.exit(1)

        modes = pygame.display.list_modes()
        print max(modes)
        pygame.display.set_mode(max(modes))

        screen = pygame.display.get_surface()
        screen_width, screen_height= screen.get_size()
        pygame.display.set_caption(title)
        #pygame.display.toggle_fullscreen()
        pygame.display.set_mode(max(modes),pygame.FULLSCREEN)

        pygame.mouse.set_visible(0)

        #create font
        timeFont = pygame.font.Font("indulta/Indulta-SemiSerif-boldFFP.otf", 100)
        dateFont = pygame.font.Font("indulta/Indulta-SemiSerif-boldFFP.otf", 60)
        weatherFont = pygame.font.Font("indulta/Indulta-SemiSerif-boldFFP.otf", 60)

        print str(waittime) +"wait time"


        current = 0
        num_files = len(file_list)
        while(True):
            try:
                img = pygame.image.load(file_list[current])
                img = img.convert()
                tempX,tempY=img.get_size()
                ratio =tempX/tempY
                tempSize=(screen_width,int(screen_width/ratio))
                print str(img.get_size())+" to "+ str(tempSize) +"and ratio: "+str(ratio)
                # rescale the image to fit the current display
                img = pygame.transform.scale(img, tempSize)
                screen.blit(img, (0, 0))

                #gets current weather
                if timeSince(lastWeather,30):
                    observation = owm.weather_at_place('Ottawa,CA')
                    w = observation.get_weather()
                    temperature=(w.get_temperature('celsius'))['temp']
                    status=w.get_status()
                    print status
                    lastWeather=time.time()
                    print "updateing weather"

                #gets the current time and displays it
                timeText=datetime.datetime.now().strftime("%I:%M%p")
                dateText=datetime.datetime.now().strftime("%B %d, %Y")
                weatherText=str(int(temperature))+"`C  "+status


                timeLabel = timeFont.render(timeText, 1, (255,255,255))
                dateLabel = dateFont.render(dateText, 1, (255,255,255))
                weatherLabel = weatherFont.render(weatherText, 1, (255,255,255))

                timeWidth, timeHeight= timeLabel.get_size()
                dateWidth, dateHeight= dateLabel.get_size()
                weatherWidth, weatherHeight= weatherLabel.get_size()

                screen.blit(weatherLabel, (0, screen_height-weatherHeight))

                screen.blit(timeLabel, (screen_width-timeWidth, screen_height-timeHeight-dateHeight))
                screen.blit(dateLabel, (screen_width-dateWidth, screen_height-dateHeight))

                pygame.display.flip()

                input(pygame.event.get())
                time.sleep(1/60)
            except pygame.error as err:
                print "Failed to display %s: %s" % (file_list[current], err)
                sys.exit(1)

            # When we get to the end, re-start at the beginning
            if timeSince(lastSwitch,waittime):
                current = (current + 1) % num_files;
                lastSwitch=time.time()


    if __name__ == '__main__':
        parser = argparse.ArgumentParser(
            description='Recursively loads images '
            'from a directory, then displays them in a Slidshow.'
        )

        parser.add_argument(
            'path',
            metavar='ImagePath',
            type=str,
            default='.',
            nargs="?",
            help='Path to a directory that contains images'
        )
        parser.add_argument(
            '--waittime',
            type=int,
            dest='waittime',
            action='store',
            default=1,
            help='Amount of time to wait before showing the next image.'
        )
        parser.add_argument(
            '--title',
            type=str,
            dest='title',
            action='store',
            default="pgSlidShow | My Slideshow!",
            help='Set the title for the display window.'
        )
        args = parser.parse_args()
        #waittime = args.waittime

        title = args.title
        main(startdir=args.path)

Answer 1

我找到了答案。在 img = pygame.image.load(file_list[current]) 上方添加行 screen.fill((0,0,0)) 已经解决了这个问题。