Developing a Paint Program in Ruby


A paint program allows users to draw, paint, and create digital artwork. Developing a simple paint program in Ruby can be a rewarding project to understand graphic user interfaces (GUIs) and basic drawing functionalities. In this guide, we'll explore the basics of building a paint program using Ruby.


Before you start, make sure you have the following prerequisites:

  • Proficiency in the Ruby programming language
  • A code editor (e.g., Visual Studio Code, Sublime Text)
  • Basic knowledge of GUI development with Ruby
  • Familiarity with basic drawing operations (lines, shapes)

Step 1: Set Up the Project

Create a new Ruby project folder and organize it into directories. You can use GUI libraries like Shoes or Ruby2D to simplify GUI development. Install the required gems and set up your development environment.

Step 2: Design the User Interface

Design the user interface for your paint program. This includes creating a canvas where users can draw, selecting colors, and providing drawing tools like a brush or pencil. You can use GUI elements provided by your chosen library.

Step 3: Implement Drawing Logic

Write Ruby code to implement the drawing functionality. You need to capture user input (mouse or touch events) and render lines or shapes on the canvas. Here's a simplified example using Ruby2D:

require 'ruby2d'
set title: 'Simple Paint Program', width: 800, height: 600
on :mouse_down do |event|
@drawing = true
@prev_x = event.x
@prev_y = event.y
on :mouse_up do
@drawing = false
on :mouse_move do |event|
if @drawing @prev_x, y1: @prev_y, x2: event.x, y2: event.y, width: 3, color: 'black')
@prev_x = event.x
@prev_y = event.y

Step 4: Add Additional Features

You can enhance your paint program by adding features like selecting different colors, choosing brush sizes, undo/redo functionality, and saving or exporting artwork. These features can make your program more versatile and user-friendly.


Developing a paint program in Ruby is a creative and educational project. While the provided code example is simplified, you can expand your paint program to include more advanced drawing tools and features. Ruby's versatility makes it a suitable language for GUI development and creating interactive applications.

Use this paint program for personal artistic endeavors, as a learning tool, or as a basis for more advanced graphical applications. Building a paint program can be a stepping stone to explore more extensive GUI and graphic development projects.

Enjoy creating your paint program with Ruby!