Rusher 2 – Getting Started

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In this tutorial I’ll show you how to put together two minimalistic games, or two very simple applications in particular, one with mouse control, and one with keyboard control.

Extending The Engine

First, you’ll need to extend either the Engine class or BasicEngine class. The Engine class is the most abstract game engine, without any systems added to it. The BasicEngine extends the Engine class and already has some basic systems added to it, including the Clock system, the Mouse system, and the Keyboard system (not all of the added systems are listed here).

You override the addSystem() method and add new systems here. The system manager is passed in as an argument for you to add systems to. Here we add two systems to the engine, which we will write later. The DisplayObjectUpdater is the system that updates every entity’s view with their position data, although we’ll pretty much create only one entity in this example. The EntityCreator system gives our game a “kick start” by creating an entity and adding several components to it.

Our document class looks like this. It passes a sprite to the engine constructor, where the sprite is intended to be the main container [...]

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