kopia lustrzana https://github.com/FacilMap/facilmap
82 wiersze
1.8 KiB
JavaScript
82 wiersze
1.8 KiB
JavaScript
const highland = require("highland");
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const polyline = require("@mapbox/polyline");
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const request = require("request-promise").defaults({
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gzip: true,
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headers: {
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'User-Agent': process.env.fmUserAgent
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}
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});
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const API_URL = "https://elevation.mapzen.com/height";
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const API_KEY = "mapzen-LWPWRB1";
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const LIMIT = 500;
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const MIN_TIME_BETWEEN_REQUESTS = 600;
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const throttle = highland();
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throttle.ratelimit(1, MIN_TIME_BETWEEN_REQUESTS).each((func) => {
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func();
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});
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const elevation = module.exports = {
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_getThrottledSlot() {
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return new Promise((resolve) => {
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throttle.write(resolve);
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});
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},
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getElevationForPoint(point) {
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return elevation.getElevationForPoints([point]).then((points) => (points[0]));
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},
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getElevationForPoints(points) {
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return Promise.resolve(points.map(() => (null)));
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/*if(points.length == 0)
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return Promise.resolve([ ]);
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let ret = Promise.resolve([ ]);
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for(let i=0; i<points.length; i+=LIMIT) {
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ret = ret.then((heights) => {
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return elevation._getThrottledSlot().then(() => (heights));
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}).then((heights) => {
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let json = {
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encoded_polyline: polyline.encode(points.slice(i, i+LIMIT).map((point) => ([point.lat, point.lon])), 6),
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range: false
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};
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return request.get({
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url: `${API_URL}?json=${encodeURI(JSON.stringify(json))}&api_key=${API_KEY}`,
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json: true
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}).then((res) => (heights.concat(res.height)));
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});
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}
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return ret;*/
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},
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getAscentDescent(elevations) {
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if(!elevations.some((ele) => (ele != null))) {
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return {
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ascent: null,
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descent: null
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};
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}
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let ret = {
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ascent: 0,
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descent: 0
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};
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for(let i=1; i<elevations.length; i++) {
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if(elevations[i] > elevations[i-1])
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ret.ascent += elevations[i] - elevations[i-1];
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else
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ret.descent += elevations[i-1] - elevations[i];
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}
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return ret;
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}
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};
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