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 var polyline, marker;

function initMap() {
  addEpolyFunc();
  map = new google.maps.Map(document.getElementById("map"), {
    zoom: 12,
    center: {
      lat: 0.5164426,
      lng: 101.4574499
    },
    mapTypeId: "terrain",
  });

  const triangleCoords = [{
      lat: 0.5022181713704478,
      lng: 101.41882830662435
    },
    {
      lat: 0.4975231087415325,
      lng: 101.39433139688956
    },
    {
      lat: 0.5103834896305101,
      lng: 101.39412725597509
    },
    {
      lat: 0.5169157367830446,
      lng: 101.39923077883651
    },
    {
      lat: 0.5350835135799168,
      lng: 101.4035177380401
    },
    {
      lat: 0.5348793815517918,
      lng: 101.41984901119662
    },
    {
      lat: 0.5022181713704478,
      lng: 101.41882830662435
    },
  ];

  const bermudaTriangle = new google.maps.Polygon({
    paths: triangleCoords,
    strokeColor: "#0000FF",
    strokeOpacity: 1,
    strokeWeight: 2,
    fillColor: "#FF6633",
    fillOpacity: 0.35,
  });

  bermudaTriangle.setMap(map);
  infoWindow = new google.maps.InfoWindow();
  polyline = new google.maps.Polyline({
    // map: map,
    path: triangleCoords,
    strokeColor: "#0000FF",
    strokeOpacity: 1,
    strokeWeight: 2,
  });
  marker = new google.maps.Marker({
    position: polyline.getPath().getAt(0),
    map: map
  })

  startAnimation();
}
var step = 50; // 5; // metres
var tick = 100; // milliseconds
var eol;
var k = 0;
var stepnum = 0;
var speed = "";
var lastVertex = 1;


//=============== animation functions ======================
function updatePoly(d) {
  // Spawn a new polyline every 20 vertices, because updating a 100-vertex poly is too slow
  if (poly2.getPath().getLength() > 20) {
    poly2 = new google.maps.Polyline([polyline.getPath().getAt(lastVertex - 1)]);
  }

  if (polyline.GetIndexAtDistance(d) < lastVertex   2) {
    if (poly2.getPath().getLength() > 1) {
      poly2.getPath().removeAt(poly2.getPath().getLength() - 1)
    }
    poly2.getPath().insertAt(poly2.getPath().getLength(), polyline.GetPointAtDistance(d));
  } else {
    poly2.getPath().insertAt(poly2.getPath().getLength(), polyline.getPath().getAt(polyline.getPath().getLength() - 1));
  }
}


function animate(d) {
  if (d > eol) {
    map.panTo(polyline.getPath().getAt(polyline.getPath().getLength() - 1));
    marker.setPosition(polyline.getPath().getAt(polyline.getPath().getLength() - 1));
    // continuous loop
    animate(0);
    return;
  }
  var p = polyline.GetPointAtDistance(d);
  map.panTo(p);
  marker.setPosition(p);
  updatePoly(d);
  timerHandle = setTimeout("animate("   (d   step)   ")", tick);
}


function startAnimation() {
  eol = google.maps.geometry.spherical.computeLength(polyline.getPath());
  map.setCenter(polyline.getPath().getAt(0));
  poly2 = new google.maps.Polyline({
    path: [polyline.getPath().getAt(0)],
    strokeColor: "#0000FF",
    strokeWeight: 10
  });
  setTimeout("animate(50)", 2000); // Allow time for the initial map display
}

function addEpolyFunc() {
  //=============== ~animation funcitons =====================
  // from epoly_v3.js
  // modified to use geometry library for length of line segments
  // === A method which returns the Vertex number at a given distance along the path ===
  // === Returns null if the path is shorter than the specified distance ===
  google.maps.Polyline.prototype.GetIndexAtDistance = function(metres) {
    // some awkward special cases
    if (metres == 0) return this.getPath().getAt(0);
    if (metres < 0) return null;
    var dist = 0;
    var olddist = 0;
    for (var i = 1;
      (i < this.getPath().getLength() amp;amp; dist < metres); i  ) {
      olddist = dist;
      dist  = google.maps.geometry.spherical.computeDistanceBetween(this.getPath().getAt(i), this.getPath().getAt(i - 1));
    }
    if (dist < metres) {
      return null;
    }
    return i;
  }
  // === A method which returns a GLatLng of a point a given distance along the path ===
  // === Returns null if the path is shorter than the specified distance ===
  google.maps.Polyline.prototype.GetPointAtDistance = function(metres) {
    // some awkward special cases
    if (metres == 0) return this.getPath().getAt(0);
    if (metres < 0) return null;
    if (this.getPath().getLength() < 2) return null;
    var dist = 0;
    var olddist = 0;
    for (var i = 1;
      (i < this.getPath().getLength() amp;amp; dist < metres); i  ) {
      olddist = dist;
      dist  = google.maps.geometry.spherical.computeDistanceBetween(this.getPath().getAt(i), this.getPath().getAt(i - 1));
    }
    if (dist < metres) {
      return null;
    }
    var p1 = this.getPath().getAt(i - 2);
    var p2 = this.getPath().getAt(i - 1);
    var m = (metres - olddist) / (dist - olddist);
    return new google.maps.LatLng(p1.lat()   (p2.lat() - p1.lat()) * m, p1.lng()   (p2.lng() - p1.lng()) * m);
  }
  // === A method which returns the length of a path in metres ===
  google.maps.Polyline.prototype.Distance = function() {
    var dist = 0;
    for (var i = 1; i < this.getPath().getLength(); i  ) {
      dist  = google.maps.geometry.spherical.computeDistanceBetween(this.getPath().getAt(i), this.getPath().getAt(i - 1));
    }
    return dist;
  }
} 

 /* 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;
} 

 <!DOCTYPE html>
<html>

<head>
  <title>Simple Polygon</title>
  <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
  <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qkamp;callback=initMapamp;libraries=geometryamp;v=weekly" defer></script>
  <!-- jsFiddle will insert css and js -->
</head>

<body>
  <div id="map"></div>
</body>

</html>