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Below code was taken from an existing post by Kieleth which I use as a subset of my larger codebase. I'm trying to leverage it to capture a list of frames taken once every thousand+ real time frames and later play in a time-lapse fashion. I've captured the frames but can't seem to view them when calling a simple function. I've seen in other posts that for loops are not recommended for this type of event but haven't figured out how to properly display. Any advise on this one would be appreciated?
from tkinter import ttk
import time
import cv2
from PIL import Image,ImageTk
#import threading
root = Tk()
def video_button1():# this flips between start and stop when video button pressed.
if root.video_btn1.cget('text') == "Stop Video":
root.video_btn1.configure(text = "Start Video")
root.cap.release()
elif root.video_btn1.cget('text') == "Start Video":
root.video_btn1.configure(text = "Stop Video")
root.cap = cv2.VideoCapture(0)
show_frame()
def show_frame():
# if video_btn1.cget('text') == "Stop Video":
global time_lapse_counter
ret, frame = root.cap.read()
if ret:
frame = cv2.flip(frame, 1) #flip image
cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
img = Image.fromarray(cv2image)
imgtk = ImageTk.PhotoImage(image=img) #converts img into tkinter readable format
root.video_label.imgtk = imgtk
if time_lapse_counter >= 20: # for Every 20 frames, capture one into time_lapse_list
time_lapse_list.append(imgtk)
time_lapse_counter = 0
root.video_label.configure(image=imgtk)
if len(time_lapse_list) == 5: # keep only 4 frames in the list *** debug purposes.
time_lapse_list.pop(0)
time_lapse_counter += 1
video_loop = root.after(40, show_frame)
else:
root.video_btn1.configure(text = "Start Video")
def time_lapse_play():
root.cap.release() #stop capturing video.
for image in time_lapse_list:
print (image, " ", len(time_lapse_list)," ",time_lapse_list) #
#*** I see the print of the pyimagexxx but nothing appears on the video***#
imgtk = image
root.video_label.imgtk = imgtk
root.video_label.configure(image=imgtk)
cv2.waitKey(500)
# video_loop = root.after(500, time_lapse_play)
def setup_widgets(): #simple label and 2 button widget setup
#Setup Top Right Window with pictures
f_width, f_height = 810, 475
root.rightframe= Frame(root, border=0, width=f_width, height = f_height)
root.rightframe.grid(row=0, column=0, padx=10, pady=0)
# Show video in Right Frame
root.cap = cv2.VideoCapture(0)
root.cap.set(cv2.CAP_PROP_FRAME_WIDTH, f_width)
root.cap.set(cv2.CAP_PROP_FRAME_HEIGHT, f_height)
root.video_label = Label(root.rightframe)
root.video_label.grid(row=0, column = 0)
root.video_btn1 = Button(root.rightframe, fg='maroon', bg="yellow", text = "Stop Video", font=("Arial",10),height=0, width = 10, command=video_button1)
root.video_btn1.grid(row=0, column = 1)
root.video_btn2 = Button(root.rightframe, fg='maroon', bg="yellow", text="Time Lapse", font=("Arial",10),height=0, width = 10, command=time_lapse_play)
root.video_btn2.grid(row=1, column = 1)
# Main Code
screen_width = root.winfo_screenwidth()
screen_height = root.winfo_screenheight()
screen_resolution = str(screen_width)+'x'+str(screen_height)
root.geometry(screen_resolution)
time_lapse_counter = 0
time_lapse_list=[]
setup_widgets()
show_frame()
root.mainloop()```
I've finally figure this one out. Seems that the for loop effectively doesn't work when using callback. I've modified the code to remove the for loop. I'm sure it could use some improvements but it works. I'm not sure how to reset the image count within the list as pop/append grows the list image number over time and I wonder about an overflow error. i.e after a few minutes, the list will contain [pyimage100 - pyimage200], after a few hours, [pyimage1000000 - pyimage1000100].
from tkinter import *
import cv2
from PIL import Image,ImageTk
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg)
import matplotlib.pyplot as plt
root = Tk()
def video_button1():# this flips between start and stop when video button pressed.
if root.video_btn1.cget('text') == "Stop Video":
root.video_btn1.configure(text = "Start Video")
root.cap.release()
elif root.video_btn1.cget('text') == "Start Video":
root.video_btn1.configure(text = "Stop Video")
root.cap = cv2.VideoCapture(0)
root.cap.set(cv2.CAP_PROP_FRAME_WIDTH, 400)
root.cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 400)
show_frame()
def show_frame():
# if video_btn1.cget('text') == "Stop Video":
global time_lapse_counter
ret, frame = root.cap.read()
if ret:
frame = cv2.flip(frame, 1) #flip image
cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
img = Image.fromarray(cv2image)
imgtk = ImageTk.PhotoImage(image=img) #converts img into tkinter readable format
root.video_label.imgtk = imgtk
root.video_label.configure(image=imgtk)
if time_lapse_counter >= 20: # for Every 20 frames, capture one into time_lapse_list
time_lapse_list.append(imgtk)
time_lapse_counter = 0
if len(time_lapse_list) == 100: # keep 99 frames in the list
time_lapse_list.pop(0)
time_lapse_counter += 1
video_loop = root.after(40, show_frame)
else:
root.video_btn1.configure(text = "Start Video")
def time_lapse_play():
root.cap.release() #stop capturing video.
global frame_counter
if frame_counter <= len(time_lapse_list)-1:
imgtk = time_lapse_list[frame_counter] # get image from list
root.video_label.configure(image=imgtk) # update label with image from list
frame_counter += 1
video_loop = root.after(250, time_lapse_play) #wait 250ms until next frame
else:
frame_counter = 0 #reset frame_counter
def setup_widgets(): #simple label and 2 button widget setup
#Setup Top Right Window with pictures
f_width, f_height = 1200, 500
root.rightframe= Frame(root, border=0, width=f_width, height = f_height)
root.rightframe.grid(row=0, column=0, padx=10, pady=0)
# Show video in Right Frame
root.cap = cv2.VideoCapture(0)
root.cap.set(cv2.CAP_PROP_FRAME_WIDTH, 400)
root.cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 400)
root.video_label = Label(root.rightframe)
root.video_label.grid(row=0, column = 0)
root.video_btn1 = Button(root.rightframe, fg='maroon', bg="yellow", text =
"Stop Video", font=("Arial",10),height=0, width = 10, command=video_button1)
root.video_btn1.grid(row=0, column = 1)
root.video_btn2 = Button(root.rightframe, fg='maroon', bg="yellow", text="Time Lapse", font=("Arial",10),height=0, width = 10, command=time_lapse_play)
root.video_btn2.grid(row=1, column = 1)
fig = plt.figure(1)
canvas = FigureCanvasTkAgg(fig, root.rightframe)
canvas.get_tk_widget().place(x=700,y=0)
canvas.get_tk_widget().config(border=2, bg="yellow", width=400, height=400)
# Main Code
screen_width = root.winfo_screenwidth()
screen_height = root.winfo_screenheight()
screen_resolution = str(screen_width)+'x'+str(screen_height)
root.geometry(screen_resolution)
time_lapse_counter = 0
frame_counter = 0
time_lapse_list=[]
setup_widgets()
show_frame()
root.mainloop()
`
from Tkinter import *
import Tkinter as tk
import ttk
import tkFileDialog
import numpy as np
import matplotlib
matplotlib.use("TkAgg")
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
from matplotlib.figure import Figure
class Look():
def __init__(self, master):
self.master = master
self.master.title("Demo")
self.master.configure(background = "grey91") #the color will be changed later
self.master.minsize(500, 300) # width + height
self.master.resizable(False, False)
self.top_frame = ttk.Frame(self.master, padding = (10, 10))
self.top_frame.pack()
ttk.Button(self.top_frame, text = "Load file", command = self.load_file,
style = "TButton").pack()
ttk.Button(self.top_frame, text = "Reset", command = self.clear_file,
style = "TButton").pack()
ttk.Button(self.top_frame, text = "Plot", command = self.plot_file,
style = "TButton").pack()
self.bottom_frame = ttk.Frame(self.master, padding = (10, 10))
self.bottom_frame.pack()
self.fig = plt.figure(figsize=(12, 5), dpi=100) ##create a figure; modify the size here
self.fig.add_subplot()
plt.title("blah")
self.canvas = FigureCanvasTkAgg(self.fig, master = self.bottom_frame)
self.canvas.show()
self.canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)
self.toolbar = NavigationToolbar2TkAgg(self.canvas, self.bottom_frame)
self.toolbar.update()
self.canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=1)
def load_file(self):
self.file = tkFileDialog.askopenfilename(defaultextension = ".txt", filetypes = [("Text Documents", "*.txt")])
def clear_file(self):
self.fig.clf()
self.fig.add_subplot()
plt.xticks()
plt.yticks()
self.canvas.draw()
def plot_file(self):
self.r, self.g = np.loadtxt(self.file).transpose()
self.fig.clf()
plt.plot(self.r, self.g)
self.canvas.show()
def main():
root = Tk()
GUI = Look(root)
root.mainloop()
if __name__ == "__main__": main()
The code above creates a program has three buttons. The Load file buttom loads a txt file, Reset button is supposed to clear the plot and delete the file just loaded into the memory. Plot button is to plot the figure onto canvas below.
I have a question about how to write function associated with Reset function, i.e. clear_file function. Currently what it does is just clear the plot from canvas. But it seems the file that has been loaded to plot is stored in memory, since click again Plot, it will display the plot. My goal is to use Reset button to bring it to a fresh start--nothing stored in memory. I know loading a new file will overwrite the previous file. But when there are multiple buttons for loading different files, the situations could become complicated. Therefore I hope Reset can do the job.
If you want to try this little program, you may create a simple txt with two column data to be loaded into the program.
Thanks.
I would make 2 changes. Move the code that sets up your plot into its own method and reset the frame each time the method is called. This can be done with destroying the frame and remaking it. The 2nd change I would change the command on your reset to reference this new method.
Taking your code this is what I would change to be able to reset the plot.
import tkinter as tk
import tkinter.ttk as ttk
from tkinter import filedialog
import numpy as np
import matplotlib
matplotlib.use("TkAgg")
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
from matplotlib.figure import Figure
class Look():
def __init__(self, master):
self.master = master
self.master.title("Demo")
self.master.configure(background = "grey91") #the color will be changed later
self.master.minsize(500, 300) # width + height
self.master.resizable(False, False)
self.top_frame = ttk.Frame(self.master, padding = (10, 10))
self.top_frame.pack()
ttk.Button(self.top_frame, text = "Load file", command = self.load_file,style = "TButton").pack()
ttk.Button(self.top_frame, text = "Reset", command = self.new_plot,style = "TButton").pack()
ttk.Button(self.top_frame, text = "Plot", command = self.plot_file,style = "TButton").pack()
self.bottom_frame = ttk.Frame(self.master, padding = (10, 10))
self.bottom_frame.pack()
self.new_plot()
# this function will reset your plot with a fresh one.
def new_plot(self):
self.bottom_frame.destroy()
self.bottom_frame = ttk.Frame(self.master, padding = (10, 10))
self.bottom_frame.pack()
self.fig = plt.figure(figsize=(12, 5), dpi=100) ##create a figure; modify the size here
self.fig.add_subplot()
plt.title("blah")
self.canvas = FigureCanvasTkAgg(self.fig, master = self.bottom_frame)
self.canvas.show()
self.canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)
self.toolbar = NavigationToolbar2TkAgg(self.canvas, self.bottom_frame)
self.toolbar.update()
self.canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=1)
def load_file(self):
self.file = filedialog.askopenfilename(defaultextension = ".txt", filetypes = [("Text Documents", "*.txt")])
def clear_file(self):
self.fig.clf()
self.fig.add_subplot()
plt.xticks()
plt.yticks()
self.canvas.draw()
def plot_file(self):
self.r, self.g = np.loadtxt(self.file).transpose()
self.fig.clf()
plt.plot(self.r, self.g)
self.canvas.show()
if __name__ == "__main__":
root = tk.Tk()
GUI = Look(root)
root.mainloop()
Here is my script
# Python 2.7.14 version
from Tkinter import *
import Tkinter
import tkMessageBox
from urllib2 import urlopen
import PIL
from PIL import ImageTk
import ImageTk
FILENAME = 'Fleur_de_lys.jpg'
root = Tk()
background = Canvas(root, width=250, height=250)##AttributeError: class Tk has no attribute 'Canvas'
canvas.pack()
tk_img = ImageTk.PhotoImage( file = FILENAME)
canvas.create_image(125, 125, image=tk_img)
quit_button = tk.Button(root, text = "Quit", command = root.quit, anchor = 'w',
width = 10, activebackground = "#33B5E5")
quit_button_window = canvas.create_window(10, 10, anchor='nw', window=quit_button)
root.mainloop()
No matter what attempt I do I keep getting AttributeError: class Tk has no attribute 'Canvas' where is my error if I just create button I have no issue what so ever all work but when I attempt to have a background image everything does not work
The problem appears to be that you're creating a canvas, and storing it in a variable named background, yet the very next line you are trying to call something called 'canvas', which you've never created.
Change this:
background = Canvas(root, width=250, height=250)
canvas.pack()
...
canvas.create_image(125, 125, image=tk_img)
to this:
background = Canvas(root, width=250, height=250)
background.pack()
...
background.create_image(125, 125, image=tk_img)
I fixed the issue jpg image was not being accepted I made it with a gif. Also found how to correct the buttons location and posn.
Here is the example without all the program
canvas = Canvas(root, width = 500, height = 500, bg='black')
canvas.pack(expand=YES, fill=BOTH)
my_image = PhotoImage(file='C:\\MOTD\\fleur_de_lys.gif')
canvas.create_image(0, 0, anchor = NW, image=my_image)
b1 = Button(root, text="From the Commander", command=callback,anchor = 'w',
width = 18, activebackground = "#33B5E5")
button_window1 = canvas.create_window(10, 10, anchor='nw', window=b1)
So using tkinter I have made a simple program that changes the color of all shapes on the canvas to a random color every second ,what I am looking for is a way to register every screen change and write down the time between screen changes in a separate file.I also need to do it without the help of too many external libraries if possible.
My code so far:
#!/usr/bin/python -W ignore::DeprecationWarning
import Tkinter
import tkMessageBox
import time
import random
colors = ['DarkOrchid1','chocolate3','gold2','khaki2','chartreuse2','deep pink','white','grey','orange']
top = Tkinter.Tk()
global b
b=0
C = Tkinter.Canvas(top, bg="blue", height=600, width=800)
bcg1=C.create_rectangle(0,0,800,100,fill=random.choice(colors))
bcg2=C.create_rectangle(0,100,800,200,fill=random.choice(colors))
bcg3=C.create_rectangle(0,200,800,300,fill=random.choice(colors))
bcg4=C.create_rectangle(0,300,800,400,fill=random.choice(colors))
bcg5=C.create_rectangle(0,400,800,500,fill=random.choice(colors))
bcg6=C.create_rectangle(0,500,800,600,fill=random.choice(colors))
bcgs=[bcg1,bcg2,bcg3,bcg4,bcg5,bcg6]
coord = 10, 50, 240, 210
rect1=C.create_rectangle(0,0,100,100,fill="green")
rect2=C.create_rectangle(700,500,800,600,fill="green")
rect3=C.create_rectangle(0,500,100,600,fill="green")
rect4=C.create_rectangle(700,0,800,100,fill="green")
def color():
global b
global bcgs
global color
if b==0:
C.itemconfig(rect1,fill='green')
C.itemconfig(rect2,fill='green')
C.itemconfig(rect3,fill='green')
C.itemconfig(rect4,fill='green')
b=1
count=0
for i in range(len(bcgs)):
C.itemconfig(bcgs[i],fill=random.choice(colors))
elif b==1:
C.itemconfig(rect1,fill='red')
C.itemconfig(rect2,fill='red')
C.itemconfig(rect3,fill='red')
C.itemconfig(rect4,fill='red')
b=0
for i in range(len(bcgs)):
C.itemconfig(bcgs[i],fill=random.choice(colors))
top.after(2000, color)
C.pack()
color()
top.mainloop()
Unless you use a real time OS, you will never get perfect timing. You can bank on being a few milliseconds off the mark. To see how much, you can calculate the difference in time.time(). For the best accuracy, move the after call to the first thing in the function.
That plus some other improvements:
#!/usr/bin/python -W ignore::DeprecationWarning
import Tkinter
import time
import random
from itertools import cycle
colors = ['DarkOrchid1','chocolate3','gold2','khaki2','chartreuse2','deep pink','white','grey','orange']
rect_colors = cycle(['green', 'red'])
top = Tkinter.Tk()
C = Tkinter.Canvas(top, bg="blue", height=600, width=800)
bcg1=C.create_rectangle(0,0,800,100,fill=random.choice(colors))
bcg2=C.create_rectangle(0,100,800,200,fill=random.choice(colors))
bcg3=C.create_rectangle(0,200,800,300,fill=random.choice(colors))
bcg4=C.create_rectangle(0,300,800,400,fill=random.choice(colors))
bcg5=C.create_rectangle(0,400,800,500,fill=random.choice(colors))
bcg6=C.create_rectangle(0,500,800,600,fill=random.choice(colors))
bcgs=[bcg1,bcg2,bcg3,bcg4,bcg5,bcg6]
coord = 10, 50, 240, 210
rect1=C.create_rectangle(0,0,100,100,fill="green")
rect2=C.create_rectangle(700,500,800,600,fill="green")
rect3=C.create_rectangle(0,500,100,600,fill="green")
rect4=C.create_rectangle(700,0,800,100,fill="green")
rects = [rect1,rect2,rect3,rect4]
last_time = time.time()
def color():
top.after(2000, color)
global last_time
rect_color = next(rect_colors)
for item in rects:
C.itemconfig(item, fill=rect_color)
for item in bcgs:
C.itemconfig(item, fill=random.choice(colors))
print("{} seconds since the last run".format(time.time() - last_time))
last_time = time.time()
C.pack()
color()
top.mainloop()
I am new to Python and even newer to Tkinter.
I am currently practicing how to use Frames and Labels and
the problem I am encountering is, when I put Labels on a frame with some buttons next to each label,
the alignment is not good to look at.
Here is the code:
from Tkinter import *
class GUI():
def __init__(self):
self.namelist = ["Mark","Anna","Jason","Lenna","Leo","Zucharich","Robinson","AReallyLongNameThatMightExist"]
self.canvas = Canvas(width=1200,height=700)
self.canvas.pack(expand=YES,fill=BOTH)
def Friends(self):
controlframe = Frame(self.canvas)
controlframe.place(x=600,y=300)
#Frame for showing names of friends
for x in self.namelist:
frame = Frame(controlframe)
frame.pack()
Name = Label(frame,text="%s "%x).pack(side=LEFT)
chatButton = Button(frame,text="Chat").pack(side=LEFT)
delButton = Button(frame,text="Delete").pack(side=LEFT)
setcloseButton = Button(frame,text="Set Close").pack(side=LEFT)
setgroupButton = Button(frame,text="Set Group").pack(side=LEFT)
mainloop()
GUI = GUI()
GUI.Friends()
What should I do so that the alignment of the Label(=name) and the button is equal to the other ones so that they will form a shape of a rectangle and not some zigzag?
It is almost always better in Tk to use the grid geometry manager. It is much more flexible once you come to understand how it works. Converting your example to use grid solves your problem as shown below but you should experiment with it a bit. Try removing the 'sticky="W"' from the label for instance and see that the centering of the widgets within the row or column can be controlled. To get your frame responding to resizes sensibly you should investigate the columnconfigure and rowconfigure options for the grid geometry management as well.
from Tkinter import *
class GUI():
def __init__(self):
self.namelist = ["Mark","Anna","Jason","Lenna",
"Leo","Zucharich","Robinson",
"AReallyLongNameThatMightExist"]
self.canvas = Canvas(width=1200,height=700)
self.canvas.pack(expand=YES,fill=BOTH)
def Friends(self):
frame = Frame(self.canvas)
frame.place(x=600,y=300)
#Frame for showing names of friends
row = 0
for x in self.namelist:
label = Label(frame,text="%s "%x)
chatButton = Button(frame,text="Chat")
delButton = Button(frame,text="Delete")
setcloseButton = Button(frame,text="Set Close")
setgroupButton = Button(frame,text="Set Group")
label.grid(row=row, column=0, sticky="W")
chatButton.grid(row=row, column=1)
delButton.grid(row=row, column=2)
setcloseButton.grid(row=row, column=3)
setgroupButton.grid(row=row, column=4)
row = row + 1
mainloop()
GUI = GUI()
GUI.Friends()