Last week I was working on a very simple game to testDragonRuby Game Toolkit and learn its API.

This Ruby implementation is based onmruby andLLVM and it’s commercial software but cheap.

The game toolkit has a simple API to handle sprites with animations, sound/music, inputs, basic drawing primitives like lines or rectangles, allows for HTTP requests and other niceties. It also has a fixed resolution and 60 times a second game loop.

The engine has a game loop that calls to a#tick method where you draw, check inputs and update game logic.

The code is structured in a couple of classes, the main one is the MyGame, that contains other classes like the Player, the list of FloorFires and the Coin to collect.

When it detects a collision it plays a sound. The game is paused when the window loses focus.

For collision detection, it uses some builtin rectangle intersection primitives.

For Input handling, the keyboard, arrows/WASD are handled the same.

And that’s pretty much it. There are a lot to improve the game but I think I’ll start a new project with a better idea to start doing something funnier and more polished.

Besidesthe official docs, I learnt a lot fromthis post series, kudos to Justin!, and also theofficial discord is super friendly and helpful when you get stuck on something.

The start screen:

In-game:

The source is about 360 lines and availableon GitHub. The assets are free.

You can download or play it onlinehere at Itch.io (DRGTK includes a great tool to deploy to Itch.io)

Happy hacking!