@deck.gl/carto/src/layers/quadbin-utils.ts

CARTO official integration with Deck.gl. Build geospatial applications using CARTO and Deck.gl.

// deck.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors

import {worldToLngLat} from '@math.gl/web-mercator';
import {cellToTile} from 'quadbin';

const TILE_SIZE = 512;

export function quadbinToOffset(quadbin: bigint): [number, number, number] {
  const {x, y, z} = cellToTile(quadbin);
  const scale = TILE_SIZE / (1 << z);
  return [x * scale, TILE_SIZE - y * scale, scale];
}

export function quadbinToWorldBounds(quadbin: bigint, coverage: number): [number[], number[]] {
  const [xOffset, yOffset, scale] = quadbinToOffset(quadbin);
  return [
    [xOffset, yOffset],
    [xOffset + coverage * scale, yOffset - coverage * scale]
  ];
}

export function getQuadbinPolygon(quadbin: bigint, coverage = 1): number[] {
  const [topLeft, bottomRight] = quadbinToWorldBounds(quadbin, coverage);
  const [w, n] = worldToLngLat(topLeft);
  const [e, s] = worldToLngLat(bottomRight);
  return [e, n, e, s, w, s, w, n, e, n];
}