Learn how to start creating 2D apps in Ruby
Before installing the gem, we’ll need to install a few dependencies, namely a native graphics engine Ruby 2D will use behind the scenes called Simple 2D.
On macOS, we recommend using Homebrew and running:
brew tap simple2d/tap brew install simple2d
On Linux, run the install script by pasting this snippet in your terminal:
url='https://raw.githubusercontent.com/simple2d/simple2d/master/bin/simple2d.sh'; which curl > /dev/null && cmd='curl -fsSL' || cmd='wget -qO -'; bash <($cmd $url) install
On Windows, learn how to set up your environment »
Now you’re ready to install the Ruby 2D gem:
gem install ruby2d
After installing the gem, create a new Ruby script called
app.rb and add the following two lines.
require 'ruby2d' show
This is the simplest Ruby 2D application you can write. The
require statement adds the Ruby 2D domain-specific language and classes, and the
show method tells Ruby 2D to show the empty window. Let’s make this window more interesting by giving it a name and adding a shape. We’ll use the
set method to change the title of the window and add a colorful triangle.
require 'ruby2d' set title: "Hello Triangle" Triangle.new( x1: 320, y1: 50, x2: 540, y2: 430, x3: 100, y3: 430, color: ['red', 'green', 'blue'] ) show
Great! Now save your script and run it on the command line using:
You should see this impressive triangle…
Congrats, you just built your first Ruby 2D app! 🎉