import * as THREE from 'three';
import { ContextManager, Event, Observable } from '@zcomponent/core';
import { StaticGroup } from '../StaticObject3D';
import * as Zappar from '@zappar/zappar';
/**
 * The World Tracker node lets you track 3D content to a point chosen by the user in the room or immediate environment around them.
 * With this tracking type you could build a 3D model viewer that lets users walk around to view the model from different angles,
 * or an experience that places an animated character in their room.
 * @zcomponent
 * @zgroup AR
 * @zicon travel_explore
 * @zlabel three/Object3D/Group/Zappar/WorldTracker
 * @ztag three/Zappar/WorldTracker
 * @zparents three/Object3D/Group/Group
 * @zdefaultchild "Ground Anchor" "@zcomponent/zappar-three/lib/components/anchorgroups/GroundAnchorGroup#GroundAnchorGroup"
 */
export declare class WorldTracker extends StaticGroup {
    private context;
    /** @zui */
    onQualityGood: Event<[]>;
    /** @zui */
    onQualityLimited: Event<[]>;
    readonly quality: Observable<Zappar.WorldTrackerQuality, never>;
    /**
     * A layer clip that will be played when the world tracker is initializing - i.e. when requiring the user to move the camera
     * to acquire a surface in the world in front of them.
     * @zui
     * @zgroup Animation
     * @zgrouppriority 10
     * @zvalues layerclipids
     */
    initializingLayerClip: Observable<string | undefined, never>;
    /**
     * A layer clip that will be played when initialization is complete and the world tracker is providing a valid 'ground' anchor.
     * @zui
     * @zgroup Animation
     * @zgrouppriority 10
     * @zvalues layerclipids
     */
    initializedLayerClip: Observable<string | undefined, never>;
    /**
     * A layer clip that will be played when the tracking quality of the world tracker is 'good' - i.e. tracking in six degrees of
     * freedom around a ground anchor.
     *
     * @zui
     * @zgroup Animation
     * @zgrouppriority 10
     * @zvalues layerclipids
     */
    qualityGoodLayerClip: Observable<string | undefined, never>;
    /**
     * A layer clip that will be played when the tracking quality of the world tracker has reduced to 'limited'
     * @zui
     * @zgroup Animation
     * @zgrouppriority 10
     * @zvalues layerclipids
     */
    qualityLimitedLayerClip: Observable<string | undefined, never>;
    /**
     * Enables/disables just the world tracker. Unlike the `enabled` property, this does not disable the entire component.
     * @zui
     * @zgroup WorldTracker
     * @zgrouppriority 20
     * @zdefault true
     */
    trackingEnabled: Observable<boolean, never>;
    /**
     * Resets the world tracker if the tracking quality is limited for a certain amount of time.
     * @zui
     * @ztype time-milliseconds
     * @zgroup WorldTracker
     * @zgrouppriority 20
     * @zdefault 5000
     */
    resetAfterLimitedFor: Observable<number, never>;
    groundAnchor: Zappar.WorldAnchor;
    private _worldTrackerContext;
    private _isInitializing;
    private _limitedTimeout;
    constructor(ctx: ContextManager, props: {}, parentForChildren?: THREE.Object3D);
    private _limitedTimeoutCallback;
    private _qualityUpdate;
    private _updateEnabled;
    private _frame;
    private _playLayerClip;
    dispose(): never;
}