Answer
code
Work Step by Step
# 13.14 (Tkinter: display a graph) Rewrite Exercise 13.13 to read data from a Web URL
# such as http://cs.armstrong.edu/liang/data/graph.txt. The program should prompt the
# user to enter the URL for the file.
import urllib
from urllib import request
from tkinter import *
def readFile():
file = urllib.request.urlopen("http://cs.armstrong.edu/liang/data/graph.txt")
data = []
n = file.readline().strip()
for i in range(int(n)):
data.append(file.readline().strip())
vertices = []
for line in data:
line = line.split()
line = [eval(x) for x in line]
vertices.append(line)
return vertices
window = Tk()
cnvs = Canvas(window)
cnvs.pack()
points = readFile()
for u in points:
x1 = u[1]
y1 = u[2]
v1 = points[u[3]]
v2 = points[u[4]]
x2 = v1[1]
y2 = v1[2]
x3 = v2[1]
y3 = v2[2]
cnvs.create_oval(x1 - 4, y1 - 4, x1 + 4, y1 + 4, fill="black")
cnvs.create_line(x1, y1, x2, y2)
cnvs.create_line(x1, y1, x3, y3)
cnvs.create_text(x1 - 8, y1 - 8, text=str(u[0]))
window.mainloop()
