vgridjs/dist/mercantile.cjs.map

Vgrid DGGS JS

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* Mercantile implementation in TypeScript\r\n * Provides functions for working with web mercator tiles\r\n */\r\n\r\nexport interface Tile {\r\n    x: number;\r\n    y: number;\r\n    z: number;\r\n}\r\n\r\nexport interface Bounds {\r\n    west: number;\r\n    south: number;\r\n    east: number;\r\n    north: number;\r\n}\r\n\r\nconst MAX_ZOOM = 32;\r\nconst MIN_ZOOM = 0;\r\n\r\n/**\r\n * Convert longitude/latitude to tile coordinates\r\n * @param lng Longitude in degrees\r\n * @param lat Latitude in degrees\r\n * @param zoom Zoom level\r\n * @returns Tile coordinates\r\n */\r\nexport function tile(lng: number, lat: number, zoom: number): Tile {\r\n    if (zoom < MIN_ZOOM || zoom > MAX_ZOOM) {\r\n        throw new Error(`Invalid zoom level: ${zoom}`);\r\n    }\r\n\r\n    if (lng < -180 || lng > 180) {\r\n        throw new Error(`Invalid longitude: ${lng}`);\r\n    }\r\n\r\n    if (lat < -90 || lat > 90) {\r\n        throw new Error(`Invalid latitude: ${lat}`);\r\n    }\r\n\r\n    const n = Math.pow(2, zoom);\r\n    const xtile = Math.floor((lng + 180) / 360 * n);\r\n    const ytile = Math.floor((1 - Math.log(Math.tan(lat * Math.PI / 180) + 1 / Math.cos(lat * Math.PI / 180)) / Math.PI) / 2 * n);\r\n\r\n    return { x: xtile, y: ytile, z: zoom };\r\n}\r\n\r\n/**\r\n * Convert tile coordinates to longitude/latitude bounds\r\n * @param x Tile X coordinate\r\n * @param y Tile Y coordinate\r\n * @param z Zoom level\r\n * @returns Bounds object with west, south, east, north in degrees\r\n */\r\nexport function bounds(x: number, y: number, z: number): Bounds {\r\n    if (z < MIN_ZOOM || z > MAX_ZOOM) {\r\n        throw new Error(`Invalid zoom level: ${z}`);\r\n    }\r\n\r\n    const n = Math.pow(2, z);\r\n    const west = x / n * 360 - 180;\r\n    const east = (x + 1) / n * 360 - 180;\r\n    const north = Math.atan(Math.sinh(Math.PI * (1 - 2 * y / n))) * 180 / Math.PI;\r\n    const south = Math.atan(Math.sinh(Math.PI * (1 - 2 * (y + 1) / n))) * 180 / Math.PI;\r\n\r\n    return { west, south, east, north };\r\n}\r\n\r\n/**\r\n * Convert tile coordinates to quadkey\r\n * @param tile Tile object\r\n * @returns Quadkey string\r\n */\r\nexport function quadkey(tile: Tile): string {\r\n    let quadkey = '';\r\n    for (let i = tile.z; i > 0; i--) {\r\n        let digit = 0;\r\n        const mask = 1 << (i - 1);\r\n        if ((tile.x & mask) !== 0) digit += 1;\r\n        if ((tile.y & mask) !== 0) digit += 2;\r\n        quadkey += digit.toString();\r\n    }\r\n    return quadkey;\r\n}\r\n\r\n/**\r\n * Convert quadkey to tile coordinates\r\n * @param quadkey Quadkey string\r\n * @returns Tile object\r\n */\r\nexport function quadkeyToTile(quadkey: string): Tile {\r\n    let x = 0;\r\n    let y = 0;\r\n    const z = quadkey.length;\r\n\r\n    for (let i = z; i > 0; i--) {\r\n        const mask = 1 << (i - 1);\r\n        const digit = parseInt(quadkey[z - i]);\r\n        if (digit & 1) x |= mask;\r\n        if (digit & 2) y |= mask;\r\n    }\r\n\r\n    return { x, y, z };\r\n}\r\n\r\n/**\r\n * Get the parent tile of a tile\r\n * @param tile Tile object\r\n * @returns Parent tile\r\n */\r\nexport function parent(tile: Tile): Tile {\r\n    if (tile.z === 0) {\r\n        throw new Error('Cannot get parent of zoom level 0');\r\n    }\r\n    return {\r\n        x: Math.floor(tile.x / 2),\r\n        y: Math.floor(tile.y / 2),\r\n        z: tile.z - 1\r\n    };\r\n}\r\n\r\n/**\r\n * Get the children tiles of a tile\r\n * @param tile Tile object\r\n * @returns Array of child tiles\r\n */\r\nexport function children(tile: Tile): Tile[] {\r\n    const z = tile.z + 1;\r\n    const x = tile.x * 2;\r\n    const y = tile.y * 2;\r\n    return [\r\n        { x, y, z },\r\n        { x: x + 1, y, z },\r\n        { x, y: y + 1, z },\r\n        { x: x + 1, y: y + 1, z }\r\n    ];\r\n}\r\n\r\n/**\r\n * Get the sibling tiles of a tile\r\n * @param tile Tile object\r\n * @returns Array of sibling tiles\r\n */\r\nexport function siblings(tile: Tile): Tile[] {\r\n    const parentTile = parent(tile);\r\n    return children(parentTile).filter(t => \r\n        t.x !== tile.x || t.y !== tile.y || t.z !== tile.z\r\n    );\r\n}\r\n\r\n/**\r\n * Get the tile coordinates for a point in web mercator coordinates\r\n * @param x Web mercator X coordinate\r\n * @param y Web mercator Y coordinate\r\n * @param zoom Zoom level\r\n * @returns Tile coordinates\r\n */\r\nexport function xyTile(x: number, y: number, zoom: number): Tile {\r\n    const n = Math.pow(2, zoom);\r\n    const xtile = Math.floor((x + 1) / 2 * n);\r\n    const ytile = Math.floor((1 - (y + 1) / 2) * n);\r\n    return { x: xtile, y: ytile, z: zoom };\r\n}\r\n\r\n/**\r\n * Convert tile coordinates to web mercator coordinates\r\n * @param tile Tile object\r\n * @returns Web mercator coordinates [x, y]\r\n */\r\nexport function tileToXY(tile: Tile): [number, number] {\r\n    const n = Math.pow(2, tile.z);\r\n    const x = (tile.x / n) * 2 - 1;\r\n    const y = 1 - (tile.y / n) * 2;\r\n    return [x, y];\r\n}\r\n\r\n/**\r\n * Convert longitude/latitude to web mercator coordinates\r\n * @param lng Longitude in degrees\r\n * @param lat Latitude in degrees\r\n * @returns Web mercator coordinates [x, y]\r\n */\r\nexport function lngLatToXY(lng: number, lat: number): [number, number] {\r\n    const x = lng / 180;\r\n    const y = Math.log(Math.tan((90 + lat) * Math.PI / 360)) / Math.PI;\r\n    return [x, y];\r\n}\r\n\r\n/**\r\n * Convert web mercator coordinates to longitude/latitude\r\n * @param x Web mercator X coordinate\r\n * @param y Web mercator Y coordinate\r\n * @returns Longitude/latitude coordinates [lng, lat]\r\n */\r\nexport function xyToLngLat(x: number, y: number): [number, number] {\r\n    const lng = x * 180;\r\n    const lat = 90 - 360 * Math.atan(Math.exp(-y * Math.PI)) / Math.PI;\r\n    return [lng, lat];\r\n} "]}