101 lines
2.8 KiB
JavaScript
101 lines
2.8 KiB
JavaScript
//gps, heading
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//get permissions
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if (navigator.userAgent.match(/(iPod|iPhone|iPad)/)) {
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function requestOrientationPermission() {
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DeviceOrientationEvent
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.requestPermission()
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.then(response => {
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if (response == 'granted') {
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window.addEventListener("deviceorientation", (event) => {
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if (event.webkitCompassHeading) {
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heading = (event.webkitCompassHeading + 180) % 360 - 180; // EAST == +90, WEST == -90
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}
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}, true);
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}
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})
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.catch(console.error)
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}
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} else {
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window.addEventListener("deviceorientationabsolute", (event) => {
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heading = ((360 - event.alpha) + 180) % 360 - 180; // EAST == +90, WEST == -90
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}, true);
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}
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const watchID = navigator.geolocation.watchPosition(
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(position) => {
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latitude = position.coords.latitude;
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longitude = position.coords.longitude;
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},
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(error) => {}, {
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enableHighAccuracy: true,
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maximumAge: 30000,
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timeout: 27000,
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}
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);
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//distance between 2 locations (lat/lon)
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function getDistance(lat1, lon1, lat2, lon2) {
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var R = 6371; // Radius of the earth in km
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var dLat = deg2rad(lat2 - lat1); // deg2rad below
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var dLon = deg2rad(lon2 - lon1);
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var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.sin(dLon / 2) * Math.sin(dLon / 2);
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var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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var d = R * c; // Distance in km
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return d;
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}
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function deg2rad(deg) {
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return deg * (Math.PI / 180)
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}
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//bearing between 2 locations (lat/lon)
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// Converts from degrees to radians.
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function toRadians(degrees) {
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return degrees * Math.PI / 180;
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};
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// Converts from radians to degrees.
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function toDegrees(radians) {
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return radians * 180 / Math.PI;
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}
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// const y = Math.sin(λ2-λ1) * Math.cos(φ2);
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// const x = Math.cos(φ1)*Math.sin(φ2) -
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// Math.sin(φ1)*Math.cos(φ2)*Math.cos(λ2-λ1);
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// const θ = Math.atan2(y, x);
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// const brng = (θ*180/Math.PI + 360) % 360; in degrees
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function getBearing(startLat, startLng, destLat, destLng) {
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startLat = toRadians(startLat);
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startLng = toRadians(startLng);
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destLat = toRadians(destLat);
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destLng = toRadians(destLng);
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y = Math.sin(destLng - startLng) * Math.cos(destLat);
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x = Math.cos(startLat) * Math.sin(destLat) - Math.sin(startLat) * Math.cos(destLat) * Math.cos(destLng - startLng);
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brng = Math.atan2(y, x);
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brng = toDegrees(brng);
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return (brng + 360) % 360;
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}
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//promisify -> new Tone.Player
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function AudioImport(url) {
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return new Promise((resolve, reject) => {
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var audio = new Tone.Player(url, () => resolve(audio));
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});
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}
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// some p5 tools
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class Textline {
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static #lines = 0;
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static #linestep = 20;
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static restart() {
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Textline.#lines = 0;
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}
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static put(t) {
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Textline.#lines = Textline.#lines + 1;
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text(t, 0, Textline.#linestep * Textline.#lines);
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}
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}
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