minimal_draw_and_save.py

#!/usr/bin/env python3
from tkinter import *
from IO_functions.handle_files import *
    
global x_0, y_0
    
def draw(event):
    global x_0, y_0
    if x_0 and y_0:
        w.create_line(x_0, y_0, event.x, event.y)
    x_0 = event.x
    y_0 = event.y

def letgo(event):
    global x_0, y_0, all_segments 
    all_segment_ids = w.find_all()
    all_segments = []
    for isegment in range(len(all_segment_ids)):
        all_segments.append(w.coords(isegment))
#    print(all_segments)
    x_0, y_0 = None, None

def print_all_segments_to_shell():
    global all_segments 
    for i in range(len(all_segments)):
         print(all_segments[i])
    return 


def draw_set_to_canvas():
    global all_segments 
    for i in range(len(all_segments)):
        w.create_line(all_segments[i])

master = Tk()

x_0 = None
y_0 = None

# setup drawing
w = Canvas(master, width=500, height=500)
w.bind('<B1-Motion>', draw)
w.bind('<ButtonRelease-1>', letgo)
w.grid(row=1,columnspan=5)

# setup buttons
button_print_to_shell = Button(master, text="Print To Shell", command = print_all_segments_to_shell )
button_print_to_shell.grid(row=0, column=0)
button_print_to_file = Button(master, text="Print To File", command = lambda :  print_all_segments_to_ASCII_file(all_segments) )
button_print_to_file.grid(row=0, column=1)
button_read_from_ASCII_file = Button(master, text="Read from File", command = read_all_segments_from_ASCII_file )
button_read_from_ASCII_file.grid(row=0, column=2)
button_draw_set_to_canvas = Button(master, text="Draw Set to Canvas", command = draw_set_to_canvas )
button_draw_set_to_canvas.grid(row=0, column=3)



all_ids = w.find_all()
print(all_ids)
mainloop()