PYTHON - TKINTER - NUMPY

 

import tkinter

import numpy as np

# Implement the default Matplotlib key bindings.

from matplotlib.backend_bases import key_press_handler

from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg,

                                               NavigationToolbar2Tk)

from matplotlib.figure import Figure

root = tkinter.Tk()

root.wm_title("Embedded in Tk")

fig = Figure(figsize=(5, 4), dpi=100)

t = np.arange(0, 3, .01)

ax = fig.add_subplot()

line, = ax.plot(t, 2 * np.sin(2 * np.pi * t))

ax.set_xlabel("time [s]")

ax.set_ylabel("f(t)")

canvas = FigureCanvasTkAgg(fig, master=root)  # A tk.DrawingArea.

canvas.draw()

# pack_toolbar=False will make it easier to use a layout manager later on.

toolbar = NavigationToolbar2Tk(canvas, root, pack_toolbar=False)

toolbar.update()

canvas.mpl_connect(

    "key_press_event", lambda event: print(f"you pressed {event.key}"))

canvas.mpl_connect("key_press_event", key_press_handler)

button_quit = tkinter.Button(master=root, text="Quit", command=root.destroy)

def update_frequency(new_val):

    # retrieve frequency

    f = float(new_val)

    # update data

    y = 2 * np.sin(2 * np.pi * f * t)

    line.set_data(t, y)

    # required to update canvas and attached toolbar!

    canvas.draw()

slider_update = tkinter.Scale(root, from_=1, to=5, orient=tkinter.HORIZONTAL,

                              command=update_frequency, label="Frequency [Hz]")

# Packing order is important. Widgets are processed sequentially and if there

# is no space left, because the window is too small, they are not displayed.

# The canvas is rather flexible in its size, so we pack it last which makes

# sure the UI controls are displayed as long as possible.

button_quit.pack(side=tkinter.BOTTOM)

slider_update.pack(side=tkinter.BOTTOM)

toolbar.pack(side=tkinter.BOTTOM, fill=tkinter.X)

canvas.get_tk_widget().pack(side=tkinter.TOP, fill=tkinter.BOTH, expand=True)

tkinter.mainloop()