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OffscreenSystem

An Excalibur System that updates entities of certain types. Systems are scene specific

Excalibur Systems currently require at least 1 Component type to operated

Multiple types are declared as a type union For example:

class MySystem extends System {
  public readonly types = ['a', 'b'] as const;
  public readonly systemType = SystemType.Update;
  public update(elapsedMs) {
     ...
  }
}

Hierarchy

Index

Constructors

Properties

Methods

Constructors

constructor

Properties

priority

priority: number = SystemPriority.Higher

System can execute in priority order, by default all systems are priority 0. Lower values indicated higher priority. For a system to execute before all other a lower priority value (-1 for example) must be set. For a system to execute after all other a higher priority value (10 for example) must be set.

query

query: Query<typeof TransformComponent | typeof GraphicsComponent>

publicsystemType

systemType: SystemType = SystemType.Draw

Determine whether the system is called in the SystemType.Update or the SystemType.Draw phase. Update is first, then Draw.

publicworld

world: World

Methods

publicinitialize

  • initialize(world: World, scene: Scene<unknown>): void

  • Optionally specify an initialize handler

    Parameters

    Returns void

optionalpostupdate

  • postupdate(scene: Scene<unknown>, elapsedMs: number): void

  • Optionally run a postupdate after the system processes matching entities

    Parameters

    • scene: Scene<unknown>
    • elapsedMs: number

      Time in milliseconds since the last frame

    Returns void

optionalpreupdate

  • preupdate(scene: Scene<unknown>, elapsedMs: number): void

  • Optionally run a preupdate before the system processes matching entities

    Parameters

    • scene: Scene<unknown>
    • elapsedMs: number

      Time in milliseconds since the last frame

    Returns void

update

  • update(): void

  • Update all entities that match this system's types

    Returns void