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index.js
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index.js
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/**
* @license
* Copyright 2019 Google LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
// [START maps_geometry_headings]
// This example requires the Geometry library. Include the libraries=geometry
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry">
let marker1, marker2;
let poly, geodesicPoly;
function initMap() {
const map = new google.maps.Map(document.getElementById("map"), {
zoom: 4,
center: { lat: 34, lng: -40.605 },
});
map.controls[google.maps.ControlPosition.TOP_CENTER].push(
document.getElementById("info"),
);
marker1 = new google.maps.Marker({
map,
draggable: true,
position: { lat: 40.714, lng: -74.006 },
});
marker2 = new google.maps.Marker({
map,
draggable: true,
position: { lat: 48.857, lng: 2.352 },
});
const bounds = new google.maps.LatLngBounds(
marker1.getPosition(),
marker2.getPosition(),
);
map.fitBounds(bounds);
google.maps.event.addListener(marker1, "position_changed", update);
google.maps.event.addListener(marker2, "position_changed", update);
poly = new google.maps.Polyline({
strokeColor: "#FF0000",
strokeOpacity: 1.0,
strokeWeight: 3,
map: map,
});
geodesicPoly = new google.maps.Polyline({
strokeColor: "#CC0099",
strokeOpacity: 1.0,
strokeWeight: 3,
geodesic: true,
map: map,
});
update();
}
function update() {
const path = [marker1.getPosition(), marker2.getPosition()];
poly.setPath(path);
geodesicPoly.setPath(path);
const heading = google.maps.geometry.spherical.computeHeading(
path[0],
path[1],
);
document.getElementById("heading").value = String(heading);
document.getElementById("origin").value = String(path[0]);
document.getElementById("destination").value = String(path[1]);
}
window.initMap = initMap;
// [END maps_geometry_headings]