@mapbox/tilebelt
Version:
simple tile utilities
227 lines • 21.8 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.tileToBBOX = tileToBBOX;
exports.tileToGeoJSON = tileToGeoJSON;
exports.pointToTile = pointToTile;
exports.pointToTileFraction = pointToTileFraction;
exports.getChildren = getChildren;
exports.getParent = getParent;
exports.getSiblings = getSiblings;
exports.hasSiblings = hasSiblings;
exports.hasTile = hasTile;
exports.tilesEqual = tilesEqual;
exports.tileToQuadkey = tileToQuadkey;
exports.quadkeyToTile = quadkeyToTile;
exports.bboxToTile = bboxToTile;
const d2r = Math.PI / 180;
const r2d = 180 / Math.PI;
function tile2lon(x, z) {
return (x / Math.pow(2, z)) * 360 - 180;
}
function tile2lat(y, z) {
const n = Math.PI - (2 * Math.PI * y) / Math.pow(2, z);
return r2d * Math.atan(0.5 * (Math.exp(n) - Math.exp(-n)));
}
/**
* Get the bbox of a tile
*
* const bbox = tileToBBOX([5, 10, 10])
* //=bbox
*/
function tileToBBOX(tile) {
const e = tile2lon(tile[0] + 1, tile[2]);
const w = tile2lon(tile[0], tile[2]);
const s = tile2lat(tile[1] + 1, tile[2]);
const n = tile2lat(tile[1], tile[2]);
return [w, s, e, n];
}
/**
* Get a geojson representation of a tile
*
* const poly = tileToGeoJSON([5, 10, 10])
* //=poly
*/
function tileToGeoJSON(tile) {
const bbox = tileToBBOX(tile);
return {
type: 'Polygon',
coordinates: [
[
[bbox[0], bbox[3]],
[bbox[0], bbox[1]],
[bbox[2], bbox[1]],
[bbox[2], bbox[3]],
[bbox[0], bbox[3]],
],
],
};
}
/**
* Get the tile for a point at a specified zoom level
*
* const tile = pointToTile(1, 1, 20)
* //=tile
*/
function pointToTile(lon, lat, z) {
const tile = pointToTileFraction(lon, lat, z);
tile[0] = Math.floor(tile[0]);
tile[1] = Math.floor(tile[1]);
return tile;
}
/**
* Get the precise fractional tile location for a point at a zoom level
*
* const tile = pointToTileFraction(30.5, 50.5, 15)
* //=tile
*/
function pointToTileFraction(lon, lat, z) {
const sin = Math.sin(lat * d2r);
const z2 = Math.pow(2, z);
let x = z2 * (lon / 360 + 0.5);
const y = z2 * (0.5 - (0.25 * Math.log((1 + sin) / (1 - sin))) / Math.PI);
// Wrap Tile X
x = x % z2;
if (x < 0)
x = x + z2;
return [x, y, z];
}
/**
* Get the 4 tiles one zoom level higher
*
* const tiles = getChildren([5, 10, 10])
* //=tiles
*/
function getChildren(tile) {
return [
[tile[0] * 2, tile[1] * 2, tile[2] + 1],
[tile[0] * 2 + 1, tile[1] * 2, tile[2] + 1],
[tile[0] * 2 + 1, tile[1] * 2 + 1, tile[2] + 1],
[tile[0] * 2, tile[1] * 2 + 1, tile[2] + 1],
];
}
/**
* Get the tile one zoom level lower
*
* const tile = getParent([5, 10, 10])
* //=tile
*/
function getParent(tile) {
return [tile[0] >> 1, tile[1] >> 1, tile[2] - 1];
}
function getSiblings(tile) {
return getChildren(getParent(tile));
}
/**
* Get the 3 sibling tiles for a tile
*
* const tiles = getSiblings([5, 10, 10])
* //=boolean
*/
function hasSiblings(tile, tiles) {
const siblings = getSiblings(tile);
for (let i = 0; i < siblings.length; i++) {
if (!hasTile(tiles, siblings[i]))
return false;
}
return true;
}
/**
* Check to see if an array of tiles contains a particular tile
*
* const tiles = [
* [0, 0, 5],
* [0, 1, 5],
* [1, 1, 5],
* [1, 0, 5]
* ]
* hasTile(tiles, [0, 0, 5])
* //=boolean
*/
function hasTile(tiles, tile) {
for (let i = 0; i < tiles.length; i++) {
if (tilesEqual(tiles[i], tile))
return true;
}
return false;
}
/**
* Check to see if two tiles are the same
*
* tilesEqual([0, 1, 5], [0, 0, 5])
* //=boolean
*/
function tilesEqual(tile1, tile2) {
return (tile1[0] === tile2[0] && tile1[1] === tile2[1] && tile1[2] === tile2[2]);
}
/**
* Get the quadkey for a tile
*
* const quadkey = tileToQuadkey([0, 1, 5])
* //=quadkey
*/
function tileToQuadkey(tile) {
let index = '';
for (let z = tile[2]; z > 0; z--) {
let b = 0;
const mask = 1 << (z - 1);
if ((tile[0] & mask) !== 0)
b++;
if ((tile[1] & mask) !== 0)
b += 2;
index += b.toString();
}
return index;
}
/**
* Get the tile for a quadkey
*
* const tile = quadkeyToTile('00001033')
* //=tile
*/
function quadkeyToTile(quadkey) {
let x = 0;
let y = 0;
const z = quadkey.length;
for (let i = z; i > 0; i--) {
const mask = 1 << (i - 1);
const q = +quadkey[z - i];
if (q === 1)
x |= mask;
if (q === 2)
y |= mask;
if (q === 3) {
x |= mask;
y |= mask;
}
}
return [x, y, z];
}
function getBboxZoom(bbox) {
const MAX_ZOOM = 28;
for (let z = 0; z < MAX_ZOOM; z++) {
const mask = 1 << (32 - (z + 1));
if ((bbox[0] & mask) !== (bbox[2] & mask) ||
(bbox[1] & mask) !== (bbox[3] & mask)) {
return z;
}
}
return MAX_ZOOM;
}
/**
* Get the smallest tile to cover a bbox
*
* const tile = bboxToTile([ -178, 84, -177, 85 ])
* //=tile
*/
function bboxToTile(bboxCoords) {
const min = pointToTile(bboxCoords[0], bboxCoords[1], 32);
const max = pointToTile(bboxCoords[2], bboxCoords[3], 32);
const bbox = [min[0], min[1], max[0], max[1]];
const z = getBboxZoom(bbox);
if (z === 0)
return [0, 0, 0];
const x = bbox[0] >>> (32 - z);
const y = bbox[1] >>> (32 - z);
return [x, y, z];
}
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type { BBox, Geometry } from 'geojson';\n\nconst d2r = Math.PI / 180;\nconst r2d = 180 / Math.PI;\n\nexport type Tile = [number, number, number];\n\nfunction tile2lon(x: number, z: number): number {\n  return (x / Math.pow(2, z)) * 360 - 180;\n}\n\nfunction tile2lat(y: number, z: number): number {\n  const n = Math.PI - (2 * Math.PI * y) / Math.pow(2, z);\n  return r2d * Math.atan(0.5 * (Math.exp(n) - Math.exp(-n)));\n}\n\n/**\n * Get the bbox of a tile\n *\n * const bbox = tileToBBOX([5, 10, 10])\n * //=bbox\n */\nexport function tileToBBOX(tile: Tile): BBox {\n  const e = tile2lon(tile[0] + 1, tile[2]);\n  const w = tile2lon(tile[0], tile[2]);\n  const s = tile2lat(tile[1] + 1, tile[2]);\n  const n = tile2lat(tile[1], tile[2]);\n  return [w, s, e, n];\n}\n\n/**\n * Get a geojson representation of a tile\n *\n * const poly = tileToGeoJSON([5, 10, 10])\n * //=poly\n */\nexport function tileToGeoJSON(tile: Tile): Geometry {\n  const bbox = tileToBBOX(tile);\n  return {\n    type: 'Polygon',\n    coordinates: [\n      [\n        [bbox[0], bbox[3]],\n        [bbox[0], bbox[1]],\n        [bbox[2], bbox[1]],\n        [bbox[2], bbox[3]],\n        [bbox[0], bbox[3]],\n      ],\n    ],\n  };\n}\n\n/**\n * Get the tile for a point at a specified zoom level\n *\n * const tile = pointToTile(1, 1, 20)\n * //=tile\n */\nexport function pointToTile(lon: number, lat: number, z: number): Tile {\n  const tile = pointToTileFraction(lon, lat, z);\n  tile[0] = Math.floor(tile[0]);\n  tile[1] = Math.floor(tile[1]);\n  return tile;\n}\n\n/**\n * Get the precise fractional tile location for a point at a zoom level\n *\n * const tile = pointToTileFraction(30.5, 50.5, 15)\n * //=tile\n */\nexport function pointToTileFraction(lon: number, lat: number, z: number): Tile {\n  const sin = Math.sin(lat * d2r);\n  const z2 = Math.pow(2, z);\n  let x = z2 * (lon / 360 + 0.5);\n  const y = z2 * (0.5 - (0.25 * Math.log((1 + sin) / (1 - sin))) / Math.PI);\n\n  // Wrap Tile X\n  x = x % z2;\n  if (x < 0) x = x + z2;\n  return [x, y, z];\n}\n\n/**\n * Get the 4 tiles one zoom level higher\n *\n * const tiles = getChildren([5, 10, 10])\n * //=tiles\n */\nexport function getChildren(tile: Tile): Tile[] {\n  return [\n    [tile[0] * 2, tile[1] * 2, tile[2] + 1],\n    [tile[0] * 2 + 1, tile[1] * 2, tile[2] + 1],\n    [tile[0] * 2 + 1, tile[1] * 2 + 1, tile[2] + 1],\n    [tile[0] * 2, tile[1] * 2 + 1, tile[2] + 1],\n  ];\n}\n\n/**\n * Get the tile one zoom level lower\n *\n * const tile = getParent([5, 10, 10])\n * //=tile\n */\nexport function getParent(tile: Tile): Tile {\n  return [tile[0] >> 1, tile[1] >> 1, tile[2] - 1];\n}\n\nexport function getSiblings(tile: Tile): Tile[] {\n  return getChildren(getParent(tile));\n}\n\n/**\n * Get the 3 sibling tiles for a tile\n *\n * const tiles = getSiblings([5, 10, 10])\n * //=boolean\n */\nexport function hasSiblings(tile: Tile, tiles: Tile[]): boolean {\n  const siblings = getSiblings(tile);\n  for (let i = 0; i < siblings.length; i++) {\n    if (!hasTile(tiles, siblings[i])) return false;\n  }\n  return true;\n}\n\n/**\n * Check to see if an array of tiles contains a particular tile\n *\n * const tiles = [\n *     [0, 0, 5],\n *     [0, 1, 5],\n *     [1, 1, 5],\n *     [1, 0, 5]\n * ]\n * hasTile(tiles, [0, 0, 5])\n * //=boolean\n */\nexport function hasTile(tiles: Tile[], tile: Tile): boolean {\n  for (let i = 0; i < tiles.length; i++) {\n    if (tilesEqual(tiles[i], tile)) return true;\n  }\n  return false;\n}\n\n/**\n * Check to see if two tiles are the same\n *\n * tilesEqual([0, 1, 5], [0, 0, 5])\n * //=boolean\n */\nexport function tilesEqual(tile1: Tile, tile2: Tile): boolean {\n  return (\n    tile1[0] === tile2[0] && tile1[1] === tile2[1] && tile1[2] === tile2[2]\n  );\n}\n\n/**\n * Get the quadkey for a tile\n *\n * const quadkey = tileToQuadkey([0, 1, 5])\n * //=quadkey\n */\nexport function tileToQuadkey(tile: Tile): string {\n  let index = '';\n  for (let z = tile[2]; z > 0; z--) {\n    let b = 0;\n    const mask = 1 << (z - 1);\n    if ((tile[0] & mask) !== 0) b++;\n    if ((tile[1] & mask) !== 0) b += 2;\n    index += b.toString();\n  }\n  return index;\n}\n\n/**\n * Get the tile for a quadkey\n *\n * const tile = quadkeyToTile('00001033')\n * //=tile\n */\nexport function quadkeyToTile(quadkey: string): Tile {\n  let x = 0;\n  let y = 0;\n  const z = quadkey.length;\n\n  for (let i = z; i > 0; i--) {\n    const mask = 1 << (i - 1);\n    const q = +quadkey[z - i];\n    if (q === 1) x |= mask;\n    if (q === 2) y |= mask;\n    if (q === 3) {\n      x |= mask;\n      y |= mask;\n    }\n  }\n  return [x, y, z];\n}\n\nfunction getBboxZoom(bbox: BBox): number {\n  const MAX_ZOOM = 28;\n  for (let z = 0; z < MAX_ZOOM; z++) {\n    const mask = 1 << (32 - (z + 1));\n    if (\n      (bbox[0] & mask) !== (bbox[2] & mask) ||\n      (bbox[1] & mask) !== (bbox[3] & mask)\n    ) {\n      return z;\n    }\n  }\n\n  return MAX_ZOOM;\n}\n\n/**\n * Get the smallest tile to cover a bbox\n *\n * const tile = bboxToTile([ -178, 84, -177, 85 ])\n * //=tile\n */\nexport function bboxToTile(bboxCoords: BBox): Tile {\n  const min = pointToTile(bboxCoords[0], bboxCoords[1], 32);\n  const max = pointToTile(bboxCoords[2], bboxCoords[3], 32);\n  const bbox: BBox = [min[0], min[1], max[0], max[1]];\n\n  const z = getBboxZoom(bbox);\n  if (z === 0) return [0, 0, 0];\n  const x = bbox[0] >>> (32 - z);\n  const y = bbox[1] >>> (32 - z);\n  return [x, y, z];\n}\n"]}