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Navigation Functions (Heading)

This example demonstrates computing the heading between two coordinates using the Geometry library. Drag the markers on the map to see the origin, destination and heading change accordingly.

Read the documentation.

JavaScript

// 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">

var marker1, marker2;
var poly, geodesicPoly;

function initMap() {
  var 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: map,
    draggable: true,
    position: { lat: 40.714, lng: -74.006 }
  });

  marker2 = new google.maps.Marker({
    map: map,
    draggable: true,
    position: { lat: 48.857, lng: 2.352 }
  });

  var 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() {
  var path = [marker1.getPosition(), marker2.getPosition()];
  poly.setPath(path);
  geodesicPoly.setPath(path);
  var heading = google.maps.geometry.spherical.computeHeading(path[0], path[1]);
  document.getElementById("heading").value = heading;
  document.getElementById("origin").value = path[0].toString();
  document.getElementById("destination").value = path[1].toString();
}

CSS

/* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
#map {
  height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: "Roboto", "sans-serif";
  line-height: 30px;
  padding-left: 10px;
}

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Navigation Functions (Heading)</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=geometry&v=weekly"
      defer
    ></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./app.js"></script>
  </head>
  <body>
    <div id="map"></div>
    <div id="floating-panel">
      Origin: <input type="text" readonly id="origin" /> Destination:
      <input type="text" readonly id="destination" /><br />
      Heading: <input type="text" readonly id="heading" /> degrees
    </div>
  </body>
</html>

All

<!DOCTYPE html>
<html>
  <head>
    <title>Navigation Functions (Heading)</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=geometry&v=weekly"
      defer
    ></script>
    <style type="text/css">
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      }

      /* Optional: Makes the sample page fill the window. */
      html,
      body {
        height: 100%;
        margin: 0;
        padding: 0;
      }

      #floating-panel {
        position: absolute;
        top: 10px;
        left: 25%;
        z-index: 5;
        background-color: #fff;
        padding: 5px;
        border: 1px solid #999;
        text-align: center;
        font-family: "Roboto", "sans-serif";
        line-height: 30px;
        padding-left: 10px;
      }
    </style>
    <script>
      (function(exports) {
        "use strict";

        // 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">
        var marker2;
        var geodesicPoly;

        function initMap() {
          var 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")
          );
          exports.marker1 = new google.maps.Marker({
            map: map,
            draggable: true,
            position: {
              lat: 40.714,
              lng: -74.006
            }
          });
          marker2 = new google.maps.Marker({
            map: map,
            draggable: true,
            position: {
              lat: 48.857,
              lng: 2.352
            }
          });
          var bounds = new google.maps.LatLngBounds(
            exports.marker1.getPosition(),
            marker2.getPosition()
          );
          map.fitBounds(bounds);
          google.maps.event.addListener(
            exports.marker1,
            "position_changed",
            update
          );
          google.maps.event.addListener(marker2, "position_changed", update);
          exports.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() {
          var path = [exports.marker1.getPosition(), marker2.getPosition()];
          exports.poly.setPath(path);
          geodesicPoly.setPath(path);
          var heading = google.maps.geometry.spherical.computeHeading(
            path[0],
            path[1]
          );
          document.getElementById("heading").value = heading;
          document.getElementById("origin").value = path[0].toString();
          document.getElementById("destination").value = path[1].toString();
        }

        exports.initMap = initMap;
        exports.update = update;
      })((this.window = this.window || {}));
    </script>
  </head>
  <body>
    <div id="map"></div>
    <div id="floating-panel">
      Origin: <input type="text" readonly id="origin" /> Destination:
      <input type="text" readonly id="destination" /><br />
      Heading: <input type="text" readonly id="heading" /> degrees
    </div>
  </body>
</html>
(function(exports) { "use strict"; // 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"> var marker2; var geodesicPoly; function initMap() { var 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") ); exports.marker1 = new google.maps.Marker({ map: map, draggable: true, position: { lat: 40.714, lng: -74.006 } }); marker2 = new google.maps.Marker({ map: map, draggable: true, position: { lat: 48.857, lng: 2.352 } }); var bounds = new google.maps.LatLngBounds( exports.marker1.getPosition(), marker2.getPosition() ); map.fitBounds(bounds); google.maps.event.addListener(exports.marker1, "position_changed", update); google.maps.event.addListener(marker2, "position_changed", update); exports.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() { var path = [exports.marker1.getPosition(), marker2.getPosition()]; exports.poly.setPath(path); geodesicPoly.setPath(path); var heading = google.maps.geometry.spherical.computeHeading( path[0], path[1] ); document.getElementById("heading").value = heading; document.getElementById("origin").value = path[0].toString(); document.getElementById("destination").value = path[1].toString(); } exports.initMap = initMap; exports.update = update; })((this.window = this.window || {}));
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; } #floating-panel { position: absolute; top: 10px; left: 25%; z-index: 5; background-color: #fff; padding: 5px; border: 1px solid #999; text-align: center; font-family: "Roboto", "sans-serif"; line-height: 30px; padding-left: 10px; }
<!DOCTYPE html> <html> <head> <title>Navigation Functions (Heading)</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://maps.googleapis.com/maps/api/js?key=&callback=initMap&libraries=geometry&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> <div id="floating-panel"> Origin: <input type="text" readonly id="origin" /> Destination: <input type="text" readonly id="destination" /><br /> Heading: <input type="text" readonly id="heading" /> degrees </div> </body> </html>