Introduction

Drawing applications allow users to create illustrations interactively. This program demonstrates how to create a basic drawing app using Python’s Tkinter library, enabling users to draw freely on a canvas using the mouse.

Objective

The objective of this program is to create an interactive drawing application with basic functionality, including drawing lines on a canvas with the mouse.

Python Code

import tkinter as tk

class DrawingApp:
    def __init__(self, root):
        self.root = root
        self.root.title("Basic Drawing App")

        self.canvas = tk.Canvas(root, width=800, height=600, bg="white")
        self.canvas.pack()

        self.canvas.bind("", self.draw)
        self.last_x, self.last_y = None, None

    def draw(self, event):
        if self.last_x and self.last_y:
            self.canvas.create_line(self.last_x, self.last_y, event.x, event.y, fill="black", width=2)
        self.last_x, self.last_y = event.x, event.y

    def reset_position(self, event):
        self.last_x, self.last_y = None, None

if __name__ == "__main__":
    root = tk.Tk()
    app = DrawingApp(root)
    root.mainloop()

Program Explanation

This Python program uses the Tkinter library to create a basic drawing application. Here’s a breakdown of the program structure:

• DrawingApp: The main application class that initializes the drawing canvas and binds mouse events.
• draw: Handles the drawing logic by creating lines on the canvas based on mouse movement.
• reset_position: Resets the last mouse position when the mouse button is released.

Steps to Run the Program

1. Ensure Python is installed on your system.
2. Copy the code into a file named drawing_app.py.
3. Open a terminal or command prompt and navigate to the directory containing the file.
4. Run the script using the command: python drawing_app.py.
5. Use your mouse to draw on the canvas.