/// <summary>
/// Pauses a scene.
/// A paused scene is continued to be rendered but is not updated.
/// </summary>
/// <param name="id">The ID of the scene.</param>
public void PauseScene(int id)
{
// Check if the scene exists.
if (scenes.ContainsKey(id))
{
// Get scene as scene state.
ISceneState state = (ISceneState)scenes[id];
// If scene is already paused or stopped, don't attempt to pause; return.
if (state.State == SceneState.Paused || state.State == SceneState.Stopped)
{
return;
}
// Pause scene.
IReadOnlyList <IEntity> entities = state.Pause();
// Remove entities from collision, input and update systems.
foreach (IEntity entity in entities)
{
collisionSystem.RemoveEntity(entity.Id);
inputSystem.RemoveEntity(entity.Id);
updateSystem.RemoveEntity(entity.Id);
}
}
}