Model View Controller using Tkinter

controller.py

try:
    import Tkinter as Tk # python 2
except ModuleNotFoundError:
    import tkinter as Tk # python 3

from model import Model
from view import View


class Controller:
    def __init__(self):
        self.root = Tk.Tk()
        self.model = Model()
        self.view = View(self.root, self.model)

    def run(self):
        self.root.title("Tkinter MVC example")
        self.root.deiconify()
        self.root.mainloop()

main.py

# -*- coding: utf-8 -*-

"""
Created on May 7, 2018
This is an improvment on the original program posted here:
https://sukhbinder.wordpress.com/2014/12/25/an-example-of-model-view-controller-design-pattern-with-tkinter-python/

The original program tightly coupled GUI dependencies into the Controller class, which defeats the whole MVC paradgim.

The example below is an improvement on the original program.
Each of the Model, View, Controller and SidePanel objects are in their own modules.
The program now runs on Python 2 & Python3, without any modifications.


"""

from controller import Controller

if __name__ == '__main__':
    c = Controller()
    c.run()

model.py

import numpy as np


class Model:

    def __init__(self):
        self.xpoint = 200
        self.ypoint = 200
        self.res = None

    def calculate(self):
        x, y = np.meshgrid(np.linspace(-5, 5, self.xpoint), np.linspace(-5, 5, self.ypoint))
        z = np.cos(x ** 2 * y ** 3)
        self.res = {"x": x, "y": y, "z": z}

side_panel.py

try:
    import Tkinter as Tk # python 2
except ModuleNotFoundError:
    import tkinter as Tk # python 3


class SidePanel():
    def __init__(self, root):
        self.frame2 = Tk.Frame(root)
        self.frame2.pack(side=Tk.LEFT, fill=Tk.BOTH, expand=1)
        self.plotBut = Tk.Button(self.frame2, text="Plot ")
        self.plotBut.pack(side="top", fill=Tk.BOTH)
        self.clearButton = Tk.Button(self.frame2, text="Clear")
        self.clearButton.pack(side="top", fill=Tk.BOTH)

view.py

try:
    import Tkinter as Tk # python 2
except ModuleNotFoundError:
    import tkinter as Tk # python 3

from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure

from side_panel import SidePanel


class View:
    def __init__(self, root, model):
        self.frame = Tk.Frame(root)
        self.model = model
        self.fig = Figure(figsize=(7.5, 4), dpi=80)
        self.ax0 = self.fig.add_axes((0.05, .05, .90, .90), facecolor=(.75, .75, .75), frameon=False)
        self.frame.pack(side=Tk.LEFT, fill=Tk.BOTH, expand=1)
        self.sidepanel = SidePanel(root)

        self.sidepanel.plotBut.bind("<Button>", self.plot)
        self.sidepanel.clearButton.bind("<Button>", self.clear)

        self.canvas = FigureCanvasTkAgg(self.fig, master=self.frame)
        self.canvas.get_tk_widget().pack(side=Tk.TOP, fill=Tk.BOTH, expand=1)
        self.canvas.show()

    def clear(self, event):
        self.ax0.clear()
        self.fig.canvas.draw()

    def plot(self, event):
        self.model.calculate()
        self.ax0.clear()
        self.ax0.contourf(self.model.res["x"], self.model.res["y"], self.model.res["z"])
        self.fig.canvas.draw()

ligne 27 self.canvas.draw()

Nice and simple example, but line#27 of view.py needs to be changed to self.canvas.draw()