Entity-Engine

A C# Entity Component System framework for use in game development. This is still a W.I.P so is currently rough around the edges.

An Entity Component System (ECS) is an architectural design pattern that allows dynamic creation of game objects through the use of components.

How to use

Core

The Core class is where the creation/destruction of entities and Adding Systems happens.

Core core = new Core();

Entity

An entity is what your game objects within your game are; Tanks, Orcs, Swords, even GUI elements like Buttons, etc. Entity's are created by using the World. An Entity is simply a wrapper around an integer. The integer is used for identifying an Entity within the framework.

Entity player = core.CreateEntity();
core.DestroyEntity(player);

Component

Components are PODs ("Plain Old Data"). The data within the components is what defines an Entity. Example of a Component:

public class Position : IComponent
{
	// Define your data.
	public float X;
	public float Y;
}

Components can be attached/removed/retrieved from Entities like so:

core.ComponentManager.AddComponent<Position>(player);
core.ComponentManager.GetComponent<Position>(player);
core.ComponentManager.RemoveComponent<Position>(player);

Entities are limited to only one of each component type, e.g. one Position component is allowed but a Position component and a Rotation component is.

System

A system, called EntitySystem within the framework, is where the processing of entity data occurs. An EntitySystem is where you define the behaviour for the entities i.e. the algorithms.

public class PositionSystem : EntitySystem
{	
	private List<Position> positionComponents;
	public void Start()
	{
		positionsComponents = Core.ComponentManager.GetComponents<Position>();
	}
	public void Update()
	{		
		for (int i = 0; i < positionComponents.Count; i++)
		{
			Position position = positionComponents[i];
			// Your behaviour code...
		}
	}
}

Todo

There is many tasks still to do:

• Unit Test
• Speed Test
• Comments
• Tidy up framework