System Management

Scene manages system registration, execution order, and lifecycle.

Adding Systems

class SystemScene extends Scene {
  protected initialize(): void {
    // Add system
    const movementSystem = new MovementSystem();
    this.addSystem(movementSystem);

    // Set system update order (lower runs first)
    movementSystem.updateOrder = 1;

    // Add more systems
    this.addSystem(new PhysicsSystem());
    this.addSystem(new RenderSystem());
  }
}

Getting Systems

// Get system of specific type
const physicsSystem = this.getEntityProcessor(PhysicsSystem);

if (physicsSystem) {
  console.log("Found physics system");
}

Removing Systems

public removeUnnecessarySystems(): void {
  const physicsSystem = this.getEntityProcessor(PhysicsSystem);

  if (physicsSystem) {
    this.removeSystem(physicsSystem);
  }
}

Controlling Systems

Enable/Disable Systems

public pausePhysics(): void {
  const physicsSystem = this.getEntityProcessor(PhysicsSystem);
  if (physicsSystem) {
    physicsSystem.enabled = false; // Disable system
  }
}

public resumePhysics(): void {
  const physicsSystem = this.getEntityProcessor(PhysicsSystem);
  if (physicsSystem) {
    physicsSystem.enabled = true; // Enable system
  }
}

Get All Systems

public getAllSystems(): EntitySystem[] {
  return this.systems; // Get all registered systems
}

System Organization Best Practice

Group systems by function:

class OrganizedScene extends Scene {
  protected initialize(): void {
    // Add systems by function and dependencies
    this.addInputSystems();
    this.addLogicSystems();
    this.addRenderSystems();
  }

  private addInputSystems(): void {
    this.addSystem(new InputSystem());
  }

  private addLogicSystems(): void {
    this.addSystem(new MovementSystem());
    this.addSystem(new PhysicsSystem());
    this.addSystem(new CollisionSystem());
  }

  private addRenderSystems(): void {
    this.addSystem(new RenderSystem());
    this.addSystem(new UISystem());
  }
}

API Reference

Method	Returns	Description
addSystem(system)	void	Add system to scene
removeSystem(system)	void	Remove system from scene
getEntityProcessor(Type)	T | undefined	Get system by type
systems	EntitySystem[]	Get all systems