如何使用变量设置图形的y和x极限

Question

Hi all guys here. I wan to know if it's possible to set new char limits using variable value every time I update a graph. Below follow my code, I can run it and plot new graph with variables, but my legend stay in the middle of data, so I don't want to change legend position then my idea was to set new y na x axis limit to fit my legend. I would thank any help.

#!/usr/bin/python3

# Importando os pacotes
import sys
import time
import RPi.GPIO as GPIO
from tkinter import ttk
from tkinter import*
import tkinter as tk
import matplotlib
matplotlib.use("TkAgg")
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
from matplotlib.figure import Figure


#Setting GPIO pins
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

GPIO.setup(18, GPIO.IN) 
GPIO.setup(23, GPIO.IN) 

GPIO.setup(17, GPIO.OUT)
GPIO.setup(27, GPIO.OUT)

GPIO.output(17, GPIO.LOW)
GPIO.output(27, GPIO.LOW)


#Setting time count variables
t1fvm = 0.0
t1ivm = 0.0
mevm = 0.0
levm = 0

t2fvm = 0.0
t2ivm = 0.0
mdvm = 0.0
ldvm = 0


#Setting Bar chart variables
ptotal_1 = 20.0
ptotal_2 = 15.0
somatoria_1 = 3.0
somatoria_2 = 6.0


#Setting buttons functions
def lev():

    if GPIO.input(17):

        t1fvm = time.time()
        global levm
        global t1ivm
        global mevm
        n1mv = (t1fvm-t1ivm)
        mevm = mevm+n1mv
        levm = int(float(mevm))
        GPIO.output(17, GPIO.LOW)

    else:
        t1ivm = time.time()
        GPIO.output(17, GPIO.HIGH)

def ldv():

    if GPIO.input(27):
        t2fvm = time.time()
        global ldvm
        global t2ivm
        global mdvm
        n2mv = (t2fvm-t2ivm)
        mdvm = mdvm+n2mv
        ldvm = int(float(mdvm))
        GPIO.output(27, GPIO.LOW)

    else:
        t2ivm = time.time()
        GPIO.output(27, GPIO.HIGH)



class showAcionam(tk.Tk):

    def __init__(self, *args, **kwargs):

        tk.Tk.__init__(self, *args, **kwargs)
        tk.Tk.wm_title(self, "SmartLight")
        container = tk.Frame(self)

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

        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)



        sairFrame = tk.Frame(self)
        self.sairFrame = sairFrame
        sairFrame.pack(side="bottom", fill="both", expand=True)
        self.frames = {}
        sair = ttk.Button(sairFrame, text="Sair")
        menuu = ttk.Button(sairFrame, text="Menu",
                               command = lambda: self.show_frame(Menu))
        menuu.pack(side="left", expand = True)

        frame = Acionamento(container, self)

        self.frames[Acionamento] = frame

        frame.grid(row=0, column=0, sticky="nsew")

        self.show_frame(Acionamento)


    def show_frame(self, cont):

        frame = self.frames[cont]
        frame.tkraise()




class Acionamento(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        label = ttk.Label(self, text="Alarmes")
        label.pack()


        esquerdaFrame = tk.Frame(self)
        self.esquerdaFrame = esquerdaFrame
        esquerdaFrame.pack(side ="left", fill="both", expand=True, pady=50, padx=30)

        direitaFrame = tk.Frame(self)
        self.direitaFrame = direitaFrame
        direitaFrame.pack(side ="left", fill="both", expand=True, pady=50, padx=30)

        modoFrame = tk.Frame(direitaFrame)
        self.direitaFrame.modoFrame = modoFrame
        modoFrame.pack(side ="top", fill="both", expand=True, pady=15, padx=10)

        setorFrame = tk.Frame(direitaFrame)
        self.direitaFrame.setorFrame = setorFrame
        setorFrame.pack(side ="top", fill="both", expand=True, pady=15, padx=10)


        #- Liga e Desliga
        onButton_1 = tk.Button(direitaFrame, text = "Button 1", height=2, width=6, command=lev)
        onButton_1.pack(side="top", expand = True)

        #- Liga e Desliga
        onButton_2 = tk.Button(direitaFrame, text = "Button 2", height=2, width=6, command=ldv)
        onButton_2.pack(side="top", expand = True)

        #Defining tkinter chart
        f = Figure(figsize=(4, 3), dpi=100)
        modo= f.add_subplot(111)
        self.modo = modo

        width = 0.5

        grafico_operacao = modo.bar(ptotal_1, somatoria_1, width, color='r')
        self.grafico_operacao = grafico_operacao
        grafico_operacao1 = modo.bar(ptotal_2+width, somatoria_2, color='g')
        self.grafico_operacao1 = grafico_operacao1

        modo.set_xlabel('Tempo (H)')
        modo.set_ylabel('Energia Consumida (KW.H)')
        modo.set_title('Consumo por Modo de Operação')
        modo.legend((grafico_operacao[0], grafico_operacao1[0]),('1', '2'))

        canvas = FigureCanvasTkAgg(f, modoFrame)
        self.canvas = canvas
        canvas.show()
        canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=True)

        toolbar = NavigationToolbar2TkAgg(canvas, modoFrame)
        toolbar.update()
        canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=True)




        ## Functio which should write new graph with new values. Here I want to set new x and y axis min and max values. How can I perform it using variables?
        def Grafico():

            global somatoria_1
            global somatoria_2
            global ptotal_1
            global ptotal_2

            ptotal_1 = (ptotal_1*somatoria_1)
            ptotal_2 = (ptotal_2*somatoria_2)
            somatoria_1 = (levm/3600)
            somatoria_2 = (ldvm/3600)

            modo.clear()

            width = 0.5

            grafico_operacao = modo.bar(ptotal_1, somatoria_1, width, color='r')
            self.grafico_operacao = grafico_operacao
            grafico_operacao1 = modo.bar(ptotal_2+width, somatoria_2, color='g')
            self.grafico_operacao1 = grafico_operacao1


            modo.set_xlabel('Tempo (H)')
            modo.set_ylabel('Energia Consumida (KW.H)')
            modo.set_title('Consumo por Modo de Operação')
            modo.legend((grafico_operacao[0], grafico_operacao1[0]),('1', '2'))

            canvas.show()

        #-Atualizar
        atualizarv = tk.Button(esquerdaFrame, text = "Atualizar", height=2, width=6, command=Grafico)
        atualizarv.pack(side="top", expand = True)



app = showAcionam()
app.geometry("800x600")
app.mainloop()