Answer
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# 9.26 (Display balls with random colors) Write a program that displays ten balls with
# random colors and placed at random locations, at shown in Figure 9.36c.
from tkinter import * # Import tkinter
from random import randint
width = 300
height = 150
radius = 4
# Convert an integer to a single hex digit in a character
def toHexChar(hexValue):
if hexValue <= 9 and hexValue >= 0:
return chr(hexValue + ord('0'))
else: # hexValue <= 15 && hexValue >= 10
return chr(hexValue - 10 + ord('A'))
class MainGUI:
def __init__(self):
window = Tk() # Create a window
window.title("Random Balls") # Set title
x = 100
y = 100
self.canvas = Canvas(window, width=width, height=height)
self.canvas.pack()
Button(window, text="Display", command=self.display).pack()
window.mainloop() # Create an event loop
def display(self):
self.canvas.delete("ball")
for i in range(10):
x = randint(0, width - 1)
y = randint(0, height - 1)
color = "#"
for j in range(6):
color += toHexChar(randint(0, 15))
self.canvas.create_oval(x - radius, y - radius, x + radius, y + radius, fill=color, tags="ball")
MainGUI()
