我正在尝试制作一个 GUI 来连续绘制从微处理器接收到的信号。我试图仅通过使用类来实现这一点,但失败了,因为只有 GUI 类是 oppend 的。现在我已经实现了线程(或者至少我认为我已经实现了!?),但每个线程只运行一次。这让我相信我不明白 tkinter 中的主循环是如何工作的,所以我可以重新编写我的代码以使线程变得活跃吗?
import Tkinter
import tkMessageBox as messagebox
from serial import *
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
import numpy as np
import time
import threading
go=0
x=[0.0001,0.0002,0.0003]
y=[3600,1000,2000]
stid=time.time()
root = Tkinter.Tk()
root.title("Serial gui")
class SensorThread(threading.Thread):
def run(self):
global run
global x
global y
global stid
print "run er ok"
if go==1:
print "go er ok"
ser = Serial(5, 9600, timeout=1)
f=ser.read(4)
ser.close()
x.append(time.time()-stid)
y.append(f)
class Foo:
def __init__(self, master):
print "foo ok"
frame = Tkinter.Frame(root)
self.button_left = Tkinter.Button(frame,text="Start",
command=self.start)
self.button_left.pack(side="left")
self.button_right = Tkinter.Button(frame,text="Stop",
command=self.stop)
self.button_right.pack(side="right")
self.button_midt = Tkinter.Button(frame, text='Quit', command=self.terminate)
self.button_midt.pack(side="bottom")
fig = Figure()
ax = fig.add_subplot(111, axisbg='black')
canvas = FigureCanvasTkAgg(fig,master=master)
canvas.show()
canvas.get_tk_widget().pack(side='top', fill='both', expand=1)
frame.pack()
line1, = ax.plot(x, y, 'r-') # Returns a tuple of line objects, thus the comma
line1.set_ydata(y)
fig.canvas.draw()
def start(self):
global go
go=1
print go
def stop(self):
global go
go=0
print go
def terminate(self):
root.quit() # stops mainloop
root.destroy() # this is necessary on Windows to prevent
# Fatal Python Error: PyEval_RestoreThread: NULL tstate
if __name__ == "__main__":
SensorThread().run()
Foo(root)
root.mainloop()
我希望你们中的一些人可以帮助我使这段代码成为一个实时更新绘图的程序。
超级我在程序中更改了以下内容,
class SensorThread(threading.Thread):
def run(self):
global run
global x
global y
global stid
#print "run er ok"
if go==1:
print "go er ok"
ser = Serial(17, 9600, timeout=1)
f=ser.read(4)
ser.close()
x.append(time.time()-stid)
y.append(f)
SensorThread().start()
else:
SensorThread().start()
class Foo:
....
if __name__ == "__main__":
SensorThread().start()
Foo(root)
root.mainloop()
但它仍然没有更新绘图的图形,它不应该在 Foo 类中执行此操作吗?现在,当我退出或退出 python 脚本时,它仍然使用 50% 的 CPU 功率,可能是因为传感器线程现在永远运行!?