reidrac / scalajs-canvas2d

Scala.js gamedev with Canvas 2D

Scala.js gamedev with Canvas 2D

Requirements

• JDK 8 (or later; openjdk 8 or 11 recommended)
• Mill (use the bootstrap script)

Quickstart

1. Run ./mill server.run for a dev HTTP server and open http://127.0.0.1:8080

2. Run mill in background:

./mill -j 4 -w game.fastOpt

Quick overview

• Loader pre-loads resources using a Canvas 2D based progress bar and creates instances of a CanvasRenderer, a Controller and Audio. On success, it instantiates a GameLoop implementation.
• CanvasRenderer sets up the canvas HTML element and exposes the 2D context providing scaling without smoothing (for pixel art). It will draw any Drawable.
• Controller is a game controller abstraction. There's a keyboard implementation.
• Audio creates audio instances and plays them.
• GameLoop provides a game loop implementation with fixed update (at 80 FPS) and draw at 60 FPS (using request animation frame).

Further info

• https://www.scala-js.org/doc/
• http://www.lihaoyi.com/mill/
• https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D