117 lines
No EOL
3.6 KiB
TypeScript
117 lines
No EOL
3.6 KiB
TypeScript
import {control} from "leaflet";
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export interface TileRange {
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xstart: number,
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ystart: number,
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xend: number,
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yend: number,
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total: number,
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zoomlevel: number
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}
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export class Tiles {
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public static MapRange<T>(tileRange: TileRange, f: (x: number, y: number) => T): T[] {
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const result: T[] = []
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const total = tileRange.total
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if (total > 100000) {
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throw "Tilerange too big"
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}
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for (let x = tileRange.xstart; x <= tileRange.xend; x++) {
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for (let y = tileRange.ystart; y <= tileRange.yend; y++) {
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const t = f(x, y);
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result.push(t)
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}
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}
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return result;
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}
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/**
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* Calculates the tile bounds of the
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* @param z
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* @param x
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* @param y
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* @returns [[maxlat, minlon], [minlat, maxlon]]
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*/
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static tile_bounds(z: number, x: number, y: number): [[number, number], [number, number]] {
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return [[Tiles.tile2lat(y, z), Tiles.tile2long(x, z)], [Tiles.tile2lat(y + 1, z), Tiles.tile2long(x + 1, z)]]
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}
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static tile_bounds_lon_lat(z: number, x: number, y: number): [[number, number], [number, number]] {
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return [[Tiles.tile2long(x, z), Tiles.tile2lat(y, z)], [Tiles.tile2long(x + 1, z), Tiles.tile2lat(y + 1, z)]]
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}
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/**
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* Returns the centerpoint [lon, lat] of the specified tile
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* @param z
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* @param x
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* @param y
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*/
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static centerPointOf(z: number, x: number, y: number): [number, number] {
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return [(Tiles.tile2long(x, z) + Tiles.tile2long(x + 1, z)) / 2, (Tiles.tile2lat(y, z) + Tiles.tile2lat(y + 1, z)) / 2]
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}
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static tile_index(z: number, x: number, y: number): number {
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return ((x * (2 << z)) + y) * 100 + z
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}
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/**
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* Given a tile index number, returns [z, x, y]
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* @param index
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* @returns 'zxy'
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*/
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static tile_from_index(index: number): [number, number, number] {
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const z = index % 100;
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const factor = 2 << z
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index = Math.floor(index / 100)
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const x = Math.floor(index / factor)
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return [z, x, index % factor]
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}
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/**
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* Return x, y of the tile containing (lat, lon) on the given zoom level
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*/
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static embedded_tile(lat: number, lon: number, z: number): { x: number, y: number, z: number } {
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return {x: Tiles.lon2tile(lon, z), y: Tiles.lat2tile(lat, z), z: z}
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}
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static TileRangeBetween(zoomlevel: number, lat0: number, lon0: number, lat1: number, lon1: number): TileRange {
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const t0 = Tiles.embedded_tile(lat0, lon0, zoomlevel)
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const t1 = Tiles.embedded_tile(lat1, lon1, zoomlevel)
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const xstart = Math.min(t0.x, t1.x)
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const xend = Math.max(t0.x, t1.x)
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const ystart = Math.min(t0.y, t1.y)
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const yend = Math.max(t0.y, t1.y)
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const total = (1 + xend - xstart) * (1 + yend - ystart)
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return {
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xstart: xstart,
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xend: xend,
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ystart: ystart,
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yend: yend,
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total: total,
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zoomlevel: zoomlevel
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}
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}
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private static tile2long(x, z) {
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return (x / Math.pow(2, z) * 360 - 180);
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}
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private static tile2lat(y, z) {
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const n = Math.PI - 2 * Math.PI * y / Math.pow(2, z);
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return (180 / Math.PI * Math.atan(0.5 * (Math.exp(n) - Math.exp(-n))));
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}
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private static lon2tile(lon, zoom) {
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return (Math.floor((lon + 180) / 360 * Math.pow(2, zoom)));
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}
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private static lat2tile(lat, zoom) {
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return (Math.floor((1 - Math.log(Math.tan(lat * Math.PI / 180) + 1 / Math.cos(lat * Math.PI / 180)) / Math.PI) / 2 * Math.pow(2, zoom)));
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}
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} |