update the plot in animation for tkinter in python - python-3.x

Question

I have a complicated program and have problem to update the curve in animation, so I simplified the program and posted a similar post before previous post, but that example is simplified too much and could not represent the actual problem. So that example got fixed but the actual program still does not work. Here I made some changes and post the code again.
The program will try to update a straight line twice at time = 3 seconds and 5 seconds , the problem is
if I do not define the xlim and ylim, then if the update is out of range, we could not see it; if I define the xlim and ylim, then the animation will plot two different curves every time I use canvas.draw(). I also tried subplot1.clear() and replot, but same thing. when I set blit=False, everything is ok, but I have to use blit=true. It looks animation keeps two sets of data in the memory, any way to delete the old data?
from multiprocessing import Process
import matplotlib
matplotlib.use("TkAgg")
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
##, NavigationToolbar2TkAgg
from matplotlib.figure import Figure
import matplotlib.animation as animation
from matplotlib import style
import tkinter as tk
from tkinter import ttk
from tkinter import *
import matplotlib.pyplot as plt
import numpy as np
import time
f = Figure(figsize=(6,6), dpi=100)
subplot_1 = f.add_subplot(211)
subplot_2 = f.add_subplot(212)
a_count = 0
b_count = 0
LARGE_FONT= ("Verdana", 12)
style.use("ggplot")
count_plot = 0
first_replot,second_replot = 0,0
start_time = 0
draw_replot = 0
a_t = [1,2,3,4,5]
a_T = np.ones(5)
canvas_draw_timer = 0
def replot(update_flag):
global a_t, count_plot,theory_line,a_T
if update_flag == 1:
a_t = [3,4,5,6,7]
a_T = np.ones(5)*2
theory_line[0].set_data(a_t,a_T)
elif update_flag == 2:
a_t = [5,6,7,8,9]
a_T = np.ones(5)*1.5
theory_line[0].set_data(a_t,a_T)
else:
theory_line = subplot_1.plot(a_t,a_T,'c-')
canvas.draw()
def animate(i):
global a_count,b_count,first_replot,second_replot,canvas_draw_timer
time1 = np.random.rand(2, 25)
data = np.random.rand(2, 25)*2
#first time update the canvas
if (time.time() - start_time > 3) and (first_replot == 0):
replot(1)
first_replot = 1
#second time update the canvas
if (time.time() - start_time > 5) and (second_replot == 0):
replot(2)
second_replot = 1
#refresh the canvas per second, just example, many other places need to use canvas.draw() later
if time.time() - canvas_draw_timer > 1:
canvas.draw()
canvas_draw_timer = time.time()
a = subplot_1.scatter(time1,data,c='blue',s=2)
return a,
class home(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
tk.Tk.wm_title(self, "Graph ")
self.geometry("1000x1000")
container = tk.Frame(self)
container.pack(side="top", fill="both", expand = True)
container.grid_rowconfigure(0, weight=1)
container.grid_columnconfigure(0, weight=1)
self.frames = {}
F=Graph
frame=Graph(container, self)
self.frames[F] = frame
frame.grid(row=0, column=0, sticky="nsew")
self.show_frame(Graph)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
def get_frame(self, frame_class):
return self.frames[frame_class]
##
class Graph(tk.Frame):
def __init__(self, parent, controller):
global canvas
tk.Frame.__init__(self, parent)
label = tk.Label(self, text=" ", font=LARGE_FONT)
label.pack(pady=120,padx=10)
collectbtn=Button(self,text='collect',command=self.clickstart)
collectbtn.place(x=200,y=100)
canvas = FigureCanvasTkAgg(f, self)
canvas.get_tk_widget().pack(side=tk.BOTTOM, fill=tk.BOTH, expand=True)
canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=True)
def clickstart(self):
global theory_line,start_time
theory_line = subplot_1.plot(a_t,a_T,'c-')
#set the large x and y range first, otherwise blit = true could not plot out of range plots
f.axes[0].set_xlim([0,10])
f.axes[0].set_ylim([0,5])
start_time = time.time()
aniplot_photon = animation.FuncAnimation(f, animate, blit=True,interval=100)
canvas.draw()
app = home()
app.mainloop()