【发布时间】：2023-05-04 07:11:02
【问题描述】：
我已经在 BeagleBone Black (Debian Jessie) 上安装了非系统字体，并且一直在通过 Tkinter 和 tkFont 使用 python 2.7 脚本创建的 GUI 中使用它们。当我更改存储文件的目录名称时，这些字体不再出现在我的 python 脚本 GUI 中！
我将字体安装到 /usr/shared/fonts 中，它们当然仍然存在，但不知何故我失去了与脚本中字体的连接。
我运行fc-cache -fv 并重新启动。我用
list( tkFont.families() )
在其中，我想使用的任何字体都会出现在列表中。
仍然在 GUI 中显示系统字体。
怎么可能？这是我的代码：
#!/usr/bin/python
import time
import threading
import Queue
import Tkinter as tk
import tkFont
try:
import alsaaudio as aa
import audioop
import Adafruit_BBIO.GPIO as GPIO
debug = False
except ImportError:
# To enable simple testing on systems without alsa/gpio
import mock
aa = mock.MagicMock()
aa.PCM().read.return_value = (1, '')
audioop = mock.MagicMock()
audioop.max.return_value = 5000
GPIO = mock.MagicMock()
import random
GPIO.input.side_effect = lambda *a: random.randint(0, 5000) == 0
debug = True
# layout ########################################################
BACKGROUND_COLOR = '#000000'
TEXTBOX_WIDTH = 1920
# vertical alignment of text in percentages from top
V_ALIGN_L1 = .16
V_ALIGN_L2 = .28
V_ALIGN_HEADER = .52
V_ALIGN_SCORE = .68
V_ALIGN_TILT = .50
V_ALIGN_AGAIN = .68
# type ##########################################################
TYPEFACE_L1 = 'Avenir Next Demi Bold'
TYPEFACE_L2 = 'Avenir Next Bold'
TYPEFACE_HEADER = 'Avenir Next Bold'
TYPEFACE_SCORE = 'Avenir Next Demi Bold'
TYPEFACE_TILT = 'Avenir Next Bold'
TYPEFACE_AGAIN = 'Avenir Next Bold'
WEIGHT_L1 = tkFont.NORMAL
WEIGHT_L2 = tkFont.BOLD
WEIGHT_HEADER = tkFont.BOLD
WEIGHT_SCORE = tkFont.NORMAL
WEIGHT_TILT = tkFont.BOLD
WEIGHT_AGAIN = tkFont.BOLD
FONT_SIZE_L1 = 56
FONT_SIZE_L2 = 56
FONT_SIZE_HEADER = 76
FONT_SIZE_SCORE = 168
FONT_SIZE_TILT = 114
FONT_SIZE_AGAIN = 76
LINE_HEIGHT_L1 = -5
LINE_HEIGHT_L2 = -5
LINE_HEIGHT_HEADER = -10
LINE_HEIGHT_SCORE = -20
LINE_HEIGHT_TILT = -20
LINE_HEIGHT_AGAIN = -1
TEXT_COLOR_HIGHLIGHT = '#FFFFFF'
TEXT_COLOR_BODY = '#92C73D'
# text ###########################################################
L1 = 'Try to beat your own score.'
L2 = 'The lowest score wins!'
HEADER_MESSAGE = 'Your Score:'
TILT_MESSAGE = 'Too loud!'
TRY_AGAIN = 'Start again!'
# audio collection configuration ##################################
BUTTON_PIN = 'P8_12'
DEVICE = 'hw:1' # hardware sound card index
CHANNELS = 2
SAMPLE_RATE = 44100 # Hz
PERIOD = 256 # Frames
FORMAT = aa.PCM_FORMAT_S16_LE # Sound format
NOISE_THRESHOLD = 0 # to eliminate small noises, scale of 0 - 7
TILT_THRESHOLD = 100.0 # upper limit of score before tilt state
SCALAR = 4680 # normalizes score, found by trial and error
UPDATE_TIME = 100 # ms
# start script ###################################################
class Display(object):
def __init__(self, parent, queue, stop_event):
self.parent = parent
self.queue = queue
self.stop_event = stop_event
self.tilt_event = threading.Event()
self._geom = '200x200+0+0'
parent.geometry("{0}x{1}+0+0".format(
parent.winfo_screenwidth(), parent.winfo_screenheight()))
parent.overrideredirect(1)
parent.title(TITLE)
parent.configure(background=BACKGROUND_COLOR)
self.create_text()
self.process_queue()
self.audio_thread = threading.Thread(target=self.setup_audio)
self.audio_thread.start()
def __delete__(self, instance):
instance.stop_event.set()
def create_text(self):
message_kwargs = dict(
bg=BACKGROUND_COLOR,
width=TEXTBOX_WIDTH,
justify='c',
)
self.message_L1 = tk.Message(
self.parent,
text=L1,
fg=TEXT_COLOR_HIGHLIGHT,
font=(TYPEFACE_HEADER, FONT_SIZE_L1, WEIGHT_L1),
pady=LINE_HEIGHT_L1,
**message_kwargs)
self.message_L2 = tk.Message(
self.parent,
text=L2,
fg=TEXT_COLOR_HIGHLIGHT,
font=(TYPEFACE_HEADER, FONT_SIZE_L2, WEIGHT_L2),
pady=LINE_HEIGHT_L2,
**message_kwargs)
self.message_score_header = tk.Message(
self.parent,
text=HEADER_MESSAGE,
fg=TEXT_COLOR_BODY,
font=(TYPEFACE_HEADER, FONT_SIZE_HEADER, WEIGHT_HEADER),
pady=LINE_HEIGHT_HEADER,
**message_kwargs)
self.message_score = tk.Message(
self.parent,
text='0.0',
fg=TEXT_COLOR_HIGHLIGHT,
font=(TYPEFACE_SCORE, FONT_SIZE_SCORE, WEIGHT_SCORE),
pady=LINE_HEIGHT_SCORE,
**message_kwargs)
self.message_L1.place(relx=.5, rely=V_ALIGN_L1, anchor='c')
self.message_L2.place(relx=.5, rely=V_ALIGN_L2, anchor='c')
self.message_score_header.place(relx=V_ALIGN_HEADER, rely=.5, anchor='c')
self.message_score.place(relx=.5, rely=V_ALIGN_SCORE, anchor='c')
def process_queue(self):
text = None
while not self.queue.empty():
text = self.queue.get_nowait()
if text:
self.message_score_header.configure(text=HEADER_MESSAGE)
self.message_score.configure(text=text)
elif self.tilt_event.is_set():
self.message_L1.configure(text="")
self.message_L2.configure(text="")
self.message_score_header.configure(text=TILT_MESSAGE, fg=TEXT_COLOR_HIGHLIGHT, font=(TYPEFACE_TILT, FONT_SIZE_TILT, WEIGHT_TILT), pady=LINE_HEIGHT_TILT)
self.message_score.configure(text=TRY_AGAIN, fg=TEXT_COLOR_BODY, font=(TYPEFACE_AGAIN, FONT_SIZE_AGAIN, WEIGHT_AGAIN), pady=LINE_HEIGHT_AGAIN)
self.message_score.place(relx=.75, rely=V_ALIGN_AGAIN, anchor='c')
self.parent.after(UPDATE_TIME, self.process_queue)
def setup_audio(self):
data_in = aa.PCM(aa.PCM_CAPTURE, aa.PCM_NONBLOCK, DEVICE)
data_in.setchannels(2)
data_in.setrate(SAMPLE_RATE)
data_in.setformat(FORMAT)
data_in.setperiodsize(PERIOD)
score = 0
running = False
while not self.stop_event.is_set():
# Sleep a very short time to prevent the thread from locking up
time.sleep(0.001)
if GPIO.input(BUTTON_PIN):
self.tilt_event.clear()
score = 0
if not running:
self.message_L1.configure(text=L1)
self.message_L2.configure(text=L2)
self.message_score_header.configure(text=HEADER_MESSAGE, fg=TEXT_COLOR_BODY, font=(TYPEFACE_HEADER, FONT_SIZE_HEADER, WEIGHT_HEADER), pady=LINE_HEIGHT_HEADER)
self.message_score.configure(text='0.0', fg=TEXT_COLOR_HIGHLIGHT, font=(TYPEFACE_SCORE, FONT_SIZE_SCORE, WEIGHT_SCORE), pady=LINE_HEIGHT_SCORE)
self.message_score.place(relx=.5, rely=V_ALIGN_SCORE, anchor='c')
running = True
self.queue.put('0.0')
elif not running:
# Not running yet, keep waiting
continue
# Read data from device
l, data = data_in.read()
if l and not self.tilt_event.is_set():
# catch frame error
try:
max = audioop.max(data, CHANNELS)
scaled_max = max // SCALAR
if scaled_max <= NOISE_THRESHOLD:
# Too quiet, ignore
continue
score += scaled_max / 10.0
if score > TILT_THRESHOLD:
self.tilt_event.set()
running = False
else:
self.queue.put(str(score))
except audioop.error, e:
if e.message != "not a whole number of frames":
raise e
def main():
GPIO.setup(BUTTON_PIN, GPIO.IN)
stop_event = threading.Event()
window = None
try:
root = tk.Tk()
queue = Queue.Queue()
window = Display(root, queue, stop_event)
# Force the window to the foreground
root.attributes('-topmost', True)
if debug:
root.maxsize(1920, 1200)
root.mainloop()
finally:
stop_event.set()
if window:
window.audio_thread.join()
del window
if __name__ == '__main__':
main()
运行脚本时没有错误消息。
编辑：还值得一提的是字体大小和粗细都在起作用，而不是字体。
【问题讨论】：
标签： python tkinter beagleboneblack