import { LngLatBounds, Map as MapSDK, LngLat } from '@maptiler/sdk';
import { TileLayer } from '../layers/TileLayer';
/**
 * A number in [0, 255]
 */
export type ColorChannelValue = number;
/**
 * A number in [0, 1]
 */
export type AlphaChannelValue = number;
/**
 * RgbChannel
 */
export type RgbChannel = "r" | "b" | "g";
/**
 * Channel(s) in a use by a layer
 */
export type UsedRgbChannel = RgbChannel | `${RgbChannel}${RgbChannel}`;
/**
 * Indices of RGBA image channels
 */
export declare enum ChannelIndices {
    r = 0,
    g = 1,
    b = 2,
    a = 3
}
/**
 * Defines a color type made of 3 ColorChannelValue OR 3 ColorChannelValue and one AlphaChannelValue
 */
export type RgbaColor = [ColorChannelValue, ColorChannelValue, ColorChannelValue] | [ColorChannelValue, ColorChannelValue, ColorChannelValue, AlphaChannelValue];
/**
 * Turns a RgbaColor into a string GLSL color constructor.
 * @param color
 * @returns a GLSL vec4 color constructor
 */
export declare function floatifyColor(color: RgbaColor): string;
/**
 * Turns a [r, g, b] or [r, g, b, a] color defined on the [0, 255] range
 * into a [r, g, b, a] color in the [0, 1] range
 * @param color
 * @returns
 */
export declare function makeUnitColor(color: RgbaColor): RgbaColor;
/**
 * Converts a latitude in degree into a unit value.
 * See the function here: https://www.desmos.com/calculator/ptaooqjt8c
 * @param lat
 * @returns
 */
export declare function latToUnit(lat: number): number;
/**
 * Converts WGS84 coordinates to [-0.5, 0.5] range.
 * @param lng
 * @param lat
 * @internal
 */
export declare function wgs84ToUnit(lng: number, lat: number): readonly [number, number];
/**
 * Converts unit range [-0.5, 0.5] to WGS84 coordinates.
 * @param unit
 * @returns
 */
export declare function unitToLat(unit: number): number;
/**
 * With a mercator image (origin: top left), return the latitude from the y in pixel coordinates
 * @param y
 * @param imageSize
 * @returns
 */
export declare function pixelToLat(y: number, imageSize: number): number;
/**
 * Radius of the Earth in meter
 */
export declare const EARTH_RADIUS_M = 6378137;
/**
 * Perimeter of the Earth alongside the equator in meter
 */
export declare const EARTH_PERIMETER_M: number;
/**
 * Converts wgs84 (longitude and latitude) into Mercator coordinates (in meters)
 * @param lng
 * @param lat
 * @returns
 */
export declare function wgs84ToMerc(lng: number, lat: number): number[];
/**
 * A Pixel as in HTMLImageElement, with the form `{r, g, b, a}`
 */
export interface Pixel extends Record<RgbChannel, ColorChannelValue> {
    a: AlphaChannelValue;
}
/**
 * Get the pixel value of an image at a given position
 * @param image
 * @param x
 * @param y
 * @returns The pixel as `{r, g, b, a}` in a [0, 1] interval (and not in [0, 255])
 */
export declare function sampleImage(image: HTMLImageElement, x: number, y: number): Pixel;
export declare function addLayerWhenReady(map: MapSDK, layer: TileLayer, beforeId?: string): void;
/**
 * Get the cardinal direction based on an angle with
 * - `0°`: true north
 * - `90°`: east
 * - `180°`: south
 * - `270°`: west
 * @param angle
 * @returns
 */
export declare function getCardinalDirection(angle: number): string;
export declare function wgs84ToMaplibreMerc(lng: number, lat: number): number[];
export declare function wgs84ToTileIndex(lngLat: LngLat, z: number): {
    z: number;
    x: number;
    y: number;
};
declare function getTileCoverage(wgs84Bound: LngLatBounds, z: number): string[];
export { getTileCoverage };