Tkinter和matplotlib-导航工具栏2Tk-光标位置精度

您可以覆盖 ax.format_coord 具有自定义格式化程序功能,如中所述 this documentation 。这是一个工作示例:

from tkinter import Frame, Tk
import matplotlib
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2Tk


def custom_format_coord(x: float, y: float) -> str:
    return f'x is {x:1.5f}, y is {y:1.5f}'  # format however you want!


window_main = Tk()

matplotlib.use("TkAgg") # Set matplotlib backend
fig = plt.Figure()
# Create canvas to hold figure
canvas = FigureCanvasTkAgg(fig, window_main)
canvas.get_tk_widget().grid(column=0, row=0)
canvas.draw()
# Create toolbar
toolbar_frame = Frame(window_main)
toolbar_frame.grid(column=0, row=1)
toolbar = NavigationToolbar2Tk(canvas, toolbar_frame)

ax = fig.add_subplot(111)

data_x = [1,2,3]
data_y = [2.5,4,1.2]

ax.plot(data_x,data_y)
# use the custom coordinate formatter to override ax.format_coord
ax.format_coord = custom_format_coord

fig.canvas.draw_idle()

window_main.mainloop()

您的自定义坐标格式化函数需要接受两个 float 值, x 和 y ,因为这些是自动传递的。