在多个子图上跟随鼠标的垂直光标

Question

我正在编写一个供个人使用的小脚本，旨在形成一些数据记录以便能够对其进行分析。我的想法是选择我想查看的数据，然后检查它们，它们将显示在多个子批次上。我将 Python 与 tkinter 和 matplotlib 一起使用。

我目前遇到的问题是我想在鼠标移动后有一个垂直光标，并且我希望这个光标在所有显示的子图中都相同。我正在尝试使用 matplotlib 中的“MultiCursor”，但它不起作用而且我没有错误。我认为问题在于我将子图列表作为参数提供给 MultiCursor，但在我的代码中我看不到如何通过其他方式来实现它。

如有任何想法或意见，我们将不胜感激。

最小可复制代码：

import tkinter as tk
from matplotlib.widgets import MultiCursor
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg

w_main = tk.Tk()
w_main.geometry("1080x720")
f_leftFrame = tk.Frame(w_main)
f_leftFrame.pack(side=tk.LEFT, anchor='nw', fill=tk.BOTH)
f_graphFrame = tk.Frame(w_main)
f_graphFrame.pack(fill=tk.BOTH, expand=1)
fig = Figure(figsize=(5, 5), dpi=100)
graph = FigureCanvasTkAgg(fig, master=f_graphFrame)
graph.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=True)

time = [0, 0.150, 0.3, 0.450, 0.6, 0.750, 0.9]
record1 = [0, 5, 3, 6, 2, 8, 9]
record2 = [1, 6, 8, 5, 7, 2, 5]
record3 = [9, 7, 5, 3, 0, 0, 2]
labels = ["record1", "record2", "record3"]
dic_state_cb = {}
test_list = []

def curveBuilder():
    dic_state_cb = {}
    sel_curves = []
    global test_list
    for i in labels:
        dic_state_cb["state_{}".format(i)] = globals()["state_{}".format(i)].get()
        if dic_state_cb["state_{}".format(i)] == 1:
            sel_curves.append(i)
    for i in range(len(labels)):
        try:
            globals()["ax{}".format(i)].remove()
            test_list = []
        except:
            pass
    for i in range(len(sel_curves)):
        globals()["ax{}".format(i)] = fig.add_subplot(int("{}1{}".format(len(sel_curves), i+1)))
        test_list.append(globals()["ax{}".format(i)])
    x = time
    if len(sel_curves) > 0:
        for i in range(len(sel_curves)):
            curve = globals()[sel_curves[i]]
            test_list[i].plot(x, curve)
            test_list[i].set_ylabel(sel_curves[i])
            if i < len(sel_curves) - 1:
                x_axis = test_list[i].axes.get_xaxis()
                x_axis.set_visible(False)
        multi = MultiCursor(graph, test_list, color="'r'", lw=2.0, vertOn=True)
    graph.draw()

for i in enumerate(labels):
    globals()["state_{}".format(i[1])] = tk.IntVar()
    cb = tk.Checkbutton(f_leftFrame, text=i[1], variable=globals()["state_{}".format(i[1])], command=curveBuilder,
                        anchor=tk.W)
    cb.pack(fill=tk.BOTH)

tk.mainloop()

Answer 1

终于我自己找到了答案。问题来自包含 MultiCursor 调用结果的变量，该结果对于我的代码中的函数是本地的。如果我将它声明为全局变量，那么它就可以正常工作。

我不太明白为什么，但它解决了问题。我希望知道为什么会发生的人在这里给出答案。

这里是工作代码：

import tkinter as tk
from matplotlib.widgets import MultiCursor
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg

w_main = tk.Tk()
w_main.geometry("1080x720")
f_leftFrame = tk.Frame(w_main)
f_leftFrame.pack(side=tk.LEFT, anchor='nw', fill=tk.BOTH)
f_graphFrame = tk.Frame(w_main)
f_graphFrame.pack(fill=tk.BOTH, expand=1)
fig = Figure(figsize=(5, 5), dpi=100)
graph = FigureCanvasTkAgg(fig, master=f_graphFrame)
graph.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=True)

time = [0, 0.150, 0.3, 0.450, 0.6, 0.750, 0.9]
record1 = [0, 5, 3, 6, 2, 8, 9]
record2 = [1, 6, 8, 5, 7, 2, 5]
record3 = [9, 7, 5, 3, 0, 0, 2]
labels = ["record1", "record2", "record3"]
dic_state_cb = {}
test_list = []

def curveBuilder():
    dic_state_cb = {}
    sel_curves = []
    global test_list
    for i in labels:
        dic_state_cb["state_{}".format(i)] = globals()["state_{}".format(i)].get()
        if dic_state_cb["state_{}".format(i)] == 1:
            sel_curves.append(i)
    for i in range(len(labels)):
        try:
            globals()["ax{}".format(i)].remove()
            test_list = []
        except:
            pass
    for i in range(len(sel_curves)):
        globals()["ax{}".format(i)] = fig.add_subplot(int("{}1{}".format(len(sel_curves), i+1)))
        test_list.append(globals()["ax{}".format(i)])
    x = time
    if len(sel_curves) > 0:
        for i in range(len(sel_curves)):
            curve = globals()[sel_curves[i]]
            test_list[i].plot(x, curve)
            test_list[i].set_ylabel(sel_curves[i])
            if i < len(sel_curves) - 1:
                x_axis = test_list[i].axes.get_xaxis()
                x_axis.set_visible(False)
        global multi
        multi = MultiCursor(graph, test_list, color='r', lw=2.0, vertOn=True)
    graph.draw()

for i in enumerate(labels):
    globals()["state_{}".format(i[1])] = tk.IntVar()
    cb = tk.Checkbutton(f_leftFrame, text=i[1], variable=globals()["state_{}".format(i[1])], command=curveBuilder,
                        anchor=tk.W)
    cb.pack(fill=tk.BOTH)

tk.mainloop()

在多个子图上跟随鼠标的垂直光标

Vertical cursor following mouse on multiple subplots

python

matplotlib

tkinter

cursor