如何使用另一个类连接和断开 matplotlib 的事件处理程序？

Question

我目前正在开发一个程序，其中class MainApplication创建GUI并加载图像。第二个class Func包括连接或断开 matplotlib 的事件处理程序的函数和回调函数on_press。

一个问题是我在类Func中使用了MainApplication的类对象self.fig和self.ax。但我只得到一个类型错误：init(( 缺少 2 个必需的位置参数："fig"和"ax"。

通常如何从另一个类操作一个类的对象？

MainApplication.py

import sys
if sys.version_info[0] < 3:
import Tkinter as Tk
else:
import tkinter as Tk
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
import matplotlib.image as mpimg  
from Func import Func  
class MainApplication(Tk.Frame):
def __init__(self, parent, *args, **kwargs):
Tk.Frame.__init__(self, parent, *args, **kwargs)
self.parent = parent
parent.iconify
parent.grid_rowconfigure(1, weight=1)
parent.grid_columnconfigure(1, weight=1)
top_frame = Tk.Frame(parent)
top_frame.grid(row=0)       
mid_frame = Tk.Frame(parent)
mid_frame.grid(row=1)
self.fig = Figure()
self.ax = self.fig.add_subplot(111)
self.ax.set_aspect('equal')       
canvas = FigureCanvasTkAgg(self.fig, mid_frame)
canvas.get_tk_widget().grid(row=0, column=0, sticky="nsew")
canvas._tkcanvas.grid(row=0, column=0, sticky="nsew")        
img = mpimg.imread('stinkbug.png')
self.ax.imshow(img)
self.fig.canvas.draw()
self.var1 = Tk.IntVar()
chkbx1 = Tk.Checkbutton(top_frame, text='connect', variable=self.var1, command=self.de_activate)
chkbx1.grid(row=0, column=0, sticky="w")
def de_activate(self):
fc = Func()
fc.__init__(self.fig, self.ax)
print('checkbutton: '+str(self.var1.get()))
if self.var1.get() == 1:
fc.connect()
print('on_press connected (cid='+str(self.cidpress)+')')
else:
fc.disconnect()
print('on_press disconnected (cid='+str(self.cidpress)+')')
if __name__ == '__main__':
root = Tk.Tk()
MainApplication(root).grid(row=0, column=0, sticky="nsew")
root.mainloop()

Func.py

class Func():
def __init__(self, fig, ax):
self.fig = fig
self.ax = ax
def connect(self):
self.cidpress = self.fig.canvas.mpl_connect('button_press_event', self.on_press)
def disconnect(self):
self.fig.canvas.mpl_disconnect(self.cidpress)
def on_press(self, event):
if event.inaxes != self.ax: return
print('button pressed')

Answer 1

正确的版本看起来像

import sys
if sys.version_info[0] < 3:
import Tkinter as Tk
else:
import tkinter as Tk
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
import matplotlib.image as mpimg  
#from Func import Func  
class Func():
def __init__(self, fig, ax):
self.fig = fig
self.ax = ax
def connect(self):
self.cidpress = self.fig.canvas.mpl_connect('button_press_event', self.on_press)
def disconnect(self):
self.fig.canvas.mpl_disconnect(self.cidpress)
def on_press(self, event):
if event.inaxes != self.ax: return
print('button pressed')
class MainApplication(Tk.Frame):
def __init__(self, parent, *args, **kwargs):
Tk.Frame.__init__(self, parent, *args, **kwargs)
self.parent = parent
parent.iconify
parent.grid_rowconfigure(1, weight=1)
parent.grid_columnconfigure(1, weight=1)
top_frame = Tk.Frame(parent)
top_frame.grid(row=0)       
mid_frame = Tk.Frame(parent)
mid_frame.grid(row=1)

self.fig = Figure()
self.ax = self.fig.add_subplot(111)
self.fc = Func(self.fig, self.ax)
self.ax.set_aspect('equal')       
canvas = FigureCanvasTkAgg(self.fig, mid_frame)
canvas.get_tk_widget().grid(row=0, column=0, sticky="nsew")
canvas._tkcanvas.grid(row=0, column=0, sticky="nsew")        
img = mpimg.imread('house.png')
self.ax.imshow(img)
self.fig.canvas.draw()
self.var1 = Tk.IntVar()
chkbx1 = Tk.Checkbutton(top_frame, text='connect', variable=self.var1, command=self.de_activate)
chkbx1.grid(row=0, column=0, sticky="w")
def de_activate(self):
print('checkbutton: '+str(self.var1.get()))
if self.var1.get() == 1:
self.fc.connect()
print('on_press connected (cid='+str(self.fc.cidpress)+')')
else:
self.fc.disconnect()
print('on_press disconnected (cid='+str(self.fc.cidpress)+')')
if __name__ == '__main__':
root = Tk.Tk()
MainApplication(root).grid(row=0, column=0, sticky="nsew")
root.mainloop()