CODEWITHSUNDEEP
pythonmatplotlibtkinter
Sandy.Arv
Sandy.Arv

Reputation: 605

Matplotlib in Tkinter

I am trying to plot a graph using Matplotlib in tkinter. Here the graph should plot all the values of 'a' in the range 0-24. My code is as follows

import math
import matplotlib
matplotlib.use("TkAgg")
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
from tkinter import *

def att_func(d=0, n=0, z=0):
# Getting User inputs from the UI

   d = d_user.get()
   n = n_user.get()
   z = z_user.get()

   a = (-9.87 * math.sin(2 * ((2 * math.pi * (d - 81)) / 365)) + n * z)
   a_label.configure(text=a)

   return (a)

#Plotting the graph
class App:
    def __init__(self, master):
        frame = tkinter.Frame(master)
        self.nbutton_graph = tkinter.Button(frame, text="Show Graph", command=self.graph)
        self.nbutton_graph.pack()


        f = Figure(figsize=(5, 5), dpi=100)
        ab = f.add_subplot(111)
        self.line, = ab.plot(range(24))
        self.canvas = FigureCanvasTkAgg(f, self)
        self.canvas.show()
        self.canvas.get_tk_widget().pack()

   def graph(self):
       day_elevation_hrs = []
       for i in range(24):
           day_elevation_hrs.append(att_func(i, 0, 0)[0])


           self.canvas.draw()

       return
root = tkinter.Tk()
app = App(root)

# User Inputs
d_user = IntVar()
n_user = DoubleVar()
z_user = DoubleVar()


nlabel_d = Label(text="Enter d").pack()
nEntry_d = Entry(root, textvariable=d_user).pack()

nlabel_n = Label(text="Enter n").pack()
nEntry_n = Entry(root, textvariable=n_user).pack()

nlabel_z = Label(text="Enter z").pack()
nEntry_z = Entry(root, textvariable=z_user).pack()

# Displaying results

nlabel_a = Label(text="a is").pack()
a_label = Label(root, text="")
a_label.pack()

root.mainloop()

Here I am able to calculate what i need. But when I am trying to plot the same, I am unable to. I tried as many modification I could. But seems to be in a stale mate. I am sure that I am going wrong somewhere. but can't figure out where.

when i try to plot the same graph with matplotlib, with out tkinter, it works. but when I try to do it in a UI with tkinter i am unable to.. Here is the code for plotting graph in matplotlib without tkinter.

 import matplotlib.pylab as pl 
 day_elevation_hrs=[]
 for i in range(24):
    day_elevation_hrs.append(att_func(i, 0, 0)[0])

 pl.title("Elevation of a in range i")
 pl.plot(day_elevation_hrs)

Upvotes: 0

Views: 2027

Answers (2)

jcfollower
jcfollower

Reputation: 3158

This documentation shows that the second explicit parameter for FigureCanvasTkAgg.__init__ should be the master. (It's really a keyword parameter.)

So, have you tried changing that line to ...

self.canvas = FigureCanvasTkAgg(f, master=master)

Upvotes: 0

Bryan Oakley
Bryan Oakley

Reputation: 386382

Your code won't run as posted, but I can see two definite problems.

First, your App is a frame that contains a canvas, but you never add the frame to the root window. Because of that, your canvas will be invisible.

Add the following code after you create an instance of App:

app.pack(side="top", fill="both", expand=True)

Second, you are making a common mistake when defining the button to display the graph. The command attribute takes a reference to a function. However, you are calling the graph() function, and using the result as the value of the command attribute.

In other words, change this:

self.nbutton_graph = Tk.Button(self, text="Show Graph", command=self.graph())

to this:

self.nbutton_graph = Tk.Button(self, text="Show Graph", command=self.graph)

Notice the lack of () after self.graph. This could be the reason why you are seeing errors like 'App' object has no attribute 'line', since you are calling the graph function before you fully initialize all your variables.

Upvotes: 1

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