/** @packageDocumentation
 * @module OrbitGT
 */
/** @internal */
declare type int32 = number;
import { Coordinate } from "../../spatial/geom/Coordinate";
import { iComparator } from "../../system/runtime/iComparator";
import { TileIndex } from "../model/TileIndex";
import { ViewTree } from "./ViewTree";
/** @internal */
export interface IProjectToViewForSort {
    projectToViewForSort(point: Coordinate): void;
}
/**
 * Class TileLoadSorter sorts file tiles by their angle with the forward view direction (smaller angles first to load tiles in the view center first).
 *
 * @internal
 */
export declare class TileLoadSorter implements iComparator<TileIndex> {
    private viewProjector;
    /** @ignore */
    static readonly _CLASSNAME_: string;
    private isiComparator_TileIndex_Instance;
    /** The global tile index */
    private tileIndex;
    /** The model transformation */
    private projectToView;
    /** The view projection */
    /**
     * Create a new sorter.
     * @param tileIndex the global tile index.
     * @param modelTransform the model transformation.
     * @param projection the view projection.
     */
    constructor(tileIndex: ViewTree, viewProjector: IProjectToViewForSort);
    /**
     * Get the position of a tile in the view (camera) space.
     * @param tile the grid index of the tile.
     * @param dX the x grid index offset.
     * @param dY the y grid index offset.
     * @param dZ the z grid index offset.
     * @return the position in view space.
     */
    private getTilePosition;
    /**
     * Get the radius of a tile.
     * @param tile the grid index of the tile.
     * @param tilePosition the position of the tile in view space.
     * @return the radius of the tile.
     */
    private getTileRadius;
    /**
     * Get the score of a tile.
     * @param tile the tile index.
     * @return the score (the lower the better).
     */
    private getScore;
    compare(tile1: TileIndex, tile2: TileIndex): int32;
}
export {};
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