tkinter example random balls (snippet)

Python tkinter (gui) example 'random balls'

Functions in program:

• def toHexChar(hexValue):

random balls

Python tkinter example: random balls

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()

Useful links

• Learn Tkinter: https://pythonbasics.org/tkinter/
• Wikipedia tkinter: https://en.wikipedia.org/wiki/Tkinter