我需要帮助来创建一个更新变量，通过它我可以创建一个Label，该Label在下面的代码中输出由PrintToLabel函数输出的变量。我可能未在kv语言部分中正确创建标签。但是，似乎回答这个问题的人比我拥有更多的kivy / python经验，我想我会在这里问这个。
# 1. Import necessary libraries
# 1.1 Kivy libraries and imports
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.gridlayout import GridLayout
from kivy.uix.image import Image
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.clock import Clock
from kivy.graphics.texture import Texture
from kivy.lang import Builder
from kivy.uix.tabbedpanel import TabbedPanel
from kivy.properties import ObjectProperty, NumericProperty
# 1.2 other libraries needed that are not a part of kivy
import cv2
import numpy as np
import pygame
from pygame.locals import *
import serial
import time
# 2. Variables (declared after structural code is done)
pygame.init()
pygame.joystick.init()
Lateral_X_Y = 0
Vertical_Z = 0
S1_Data = 0
S2_Data = 0
S3_Data = 0
S4_Data = 0
Lights = 0
In_Min = float(-1)
In_Max = float(1)
Out_Min = float(1000)
Out_Max = float(2000)
Scaled_Out_Min = float(1250)
Scaled_Out_Max = float(1750)
startMarker = '<'
endMarker = '\n'
dividingmarker = ','
# arduino = serial.Serial(port="COM14", baudrate=115200, timeout=0.01)
time.sleep(.01)
# 3. tabpanelkv kv file
Builder.load_string("""
<tabpanelkv>:
size_hint: 1, 1
pos_hint: {'center_x': .5, 'center_y': .5}
do_default_tab: False
TabbedPanelItem:
text: 'Cameras'
GridLayout:
rows: 1
cols: 2
GridLayout:
size_hint: 1.7, 1
rows: 1
cols: 1
KivyCamera:
cam: 0
GridLayout:
rows: 2
cols: 1
KivyCamera:
cam: 2
Button:
text: 'Cam3'
TabbedPanelItem:
text: 'Diagnostics'
GridLayout:
rows: 4
cols: 1
JoystickValue:
Label:
text: self.PrintToLabel.Xmov
""")
class KivyCamera(Image):
cam = ObjectProperty()
fps = NumericProperty(30)
def __init__(self, **kwargs):
super(KivyCamera, self).__init__(**kwargs)
self._capture = None
if self.cam is not None:
self._capture = cv2.VideoCapture(self.cam)
Clock.schedule_interval(self.update, 1.0 / self.fps)
def on_cam(self, *args):
if self._capture is not None:
self._capture.release()
self._capture = cv2.VideoCapture(self.cam)
@property
def capture(self):
return self._capture
def update(self, dt):
ret, frame = self.capture.read()
if ret:
buf1 = cv2.flip(frame, 0)
buf = buf1.tostring()
image_texture = Texture.create(
size=(frame.shape[1], frame.shape[0]), colorfmt="bgr"
)
image_texture.blit_buffer(buf, colorfmt="bgr", bufferfmt="ubyte")
self.texture = image_texture
class JoystickValue(Label):
Joy1 = pygame.joystick.Joystick(0)
Joy2 = pygame.joystick.Joystick(1)
Joy1.init()
Joy2.init()
def JoyRead(Joy1, Joy2):
Joy1X = Joystick1.get_axis(0)
Joy1Y = Joystick1.get_axis(1)
Joy2X = Joystick2.get_axis(0)
Joy2Y = Joystick2.get_axis(1)
# Buttons on Joy1: 2,3,6,7,8,9,10
Joy1B2 = Joystick1.get_button(1)
Joy1B3 = Joystick1.get_button(2)
Joy1B6 = Joystick1.get_button(5)
Joy1B7 = Joystick1.get_button(6)
Joy1B8 = Joystick1.get_button(7)
Joy1B9 = Joystick1.get_button(8)
Joy1B10 = Joystick1.get_button(9)
# Buttons for Joy2: 1, 6
Joy2B1 = Joystick2.get_button(0)
Joy2B6 = Joystick2.get_button(5)
# Hat switch for Joy1
Joy1HF = Joy1.get_hat(0)
return Joy1X, Joy1Y, Joy2X, Joy2Y, Joy1B2, Joy1B3, Joy1B6, Joy1B7, Joy1B8, Joy1B9, Joy1B10, Joy2B1, Joy2B6, Joy1HF
def JoyCalc(Joy1X, Joy1Y, Joy2X, Joy2Y, Joy1B2, Joy1B3, Joy1B6, Joy1B7, Joy1B8, Joy1B9, Joy1B10, Joy2B1, Joy2B6, Joy1HF):
if Joy1B10 == True:
Xmov = (((Joy1X - In_Min) * (Scaled_Out_Max - Scaled_Out_Min)) / (In_Max - In_Min)) + 1250
Ymov = 1250 + (((Joy1Y - In_Min) * (Scaled_Out_Max - Scaled_Out_Min)) / (In_Max - In_Min))
else:
Xmov = (((Joy1X - In_Min) * (Out_Max - Out_Min)) / (In_Max - In_Min)) + 1000
Ymov = 1000 - (((Joy1Y - In_Min) * (Out_Max - Out_Min)) / (In_Max - In_Min)) + 1000
User = (((Joy2X - In_Min) * (Out_Max - Out_Min)) / (In_Max - In_Min)) + 1000
Tser = 1000 - (((Joy2Y - In_Min) * (Out_Max - Out_Min)) / (In_Max - In_Min)) + 1000
Oser = Joy2B1
if Joy1HF == (0, 1):
CTser += 10
elif Joy1HF == (0, -1):
CTser -= 10
else:
CTser = CTser
return Xmov, Ymov, Zmov, User, Tser, Oser, CTser
def PrintToLabel(Xmov, Ymov, User, Tser, Oser, CTser):
Xmov = StringProperty()
Ymov = StringProperty()
User = StringProperty()
Tser = StringProperty()
Oser = StringProperty()
CTser = StringProperty()
return Xmov, Ymov, User, Tser, Oser, CTser
def SendtoArduino(Xmov, Ymov, Zmov, User, Tser, Oser, CTser):
return print("Fuck you")
# 5. tabpanelkv class
class tabpanelkv(TabbedPanel):
pass
# 6. Main Class
class MainClass(App, GridLayout):
def build(self):
return tabpanelkv()
# 7. Main Loop
if __name__ == '__main__':
MainClass().run()
相关代码^^^ 我创建了必要的变量，并且操纵杆代码正确（我在仅使用pygame之前创建了代码，但是现在我们需要UI更具灵活性）。但是我不知道如何使用kivy创建更新标签。我还将在此消息中添加我不断收到的错误消息。
...
32: JoystickValue:
33: Label:
>> 34: text: self.PrintToLabel.Xmov
35:
...
BuilderException: Parser: File "<inline>", line 34:
...
32: JoystickValue:
33: Label:
>> 34: text: self.PrintToLabel.Xmov
35:
...
AttributeError: 'Label' object has no attribute 'PrintToLabel'
File "/home/mlees/kivy_venv/lib/python3.6/site-packages/kivy/lang/builder.py", line 249, in create_handler
return eval(value, idmap), bound_list
File "<string>", line 34, in <module>
File "kivy/weakproxy.pyx", line 32, in kivy.weakproxy.WeakProxy.__getattr__
File "/home/mlees/kivy_venv/lib/python3.6/site-packages/kivy/lang/builder.py", line 692, in _apply_rule
rctx['ids'])
File "/home/mlees/kivy_venv/lib/python3.6/site-packages/kivy/lang/builder.py", line 254, in create_handler
cause=tb)
Segmentation fault (core dumped)
我也了解到我已经问了很多有关此代码的问题。我是使用Kivy创建UI的新手，所以请理解这一点。
答案 0 :(得分：1)
...
32: JoystickValue:
33: Label:
>> 34: text: self.PrintToLabel.Xmov
self这是Label实例。 Label类没有PrintToLabel属性，因此会崩溃。大概您需要引用其他具有此属性的类的PrintToLabel属性。