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<!DOCTYPE html>
<html>
  <head>
    <title>Polyline path</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
    html, body, #map {
      height: 100%;
      width: 100%;
    }
</style>
    <script src="https://maps.googleapis.com/maps/api/js?" type="text/javascript"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script>
    var map;
    var id;
    var gmarkers = [];
    var gmarkersicons = [];
​
    function initMap() {
​
      var mapOptions = {
            zoom: 3,
            mapTypeId: google.maps.MapTypeId.TERRAIN,
            center: {lat: 9.291, lng: -157.821}
        };
      map = new google.maps.Map(document.getElementById("map"),
                mapOptions);
​
       var points = [
         {lat: 37.772, lng: -122.214},
         {lat: 21.291, lng: -157.821},
         {lat: -18.142, lng: 178.431},
         {lat: -27.467, lng: 153.027}
       ];
     var poly = new google.maps.Polyline({
            path: points,
            strokeColor: "red",
            strokeOpacity: 1,
            strokeWeight: 4,
            recordNum: "test"
        });
​
        poly.setMap(map);
​
        google.maps.event.addListener(poly, 'mouseover', function() {
            var start = {
                path: "M-20,0a20,20 0 1,0 40,0a20,20 0 1,0 -40,0",
                fillColor: '#00ff00',
                fillOpacity: 1,
                strokeColor:'#000000',
                strokeWeight: 4,
                scale: 0.5
            }
            var end = {
                path: "M-20,0a20,20 0 1,0 40,0a20,20 0 1,0 -40,0",
                fillColor: '#FF0000',
                fillOpacity: 1,
                strokeColor:'#000000',
                strokeWeight: 4,
                scale: 0.5
            }
            var go = {
                path: "M-20,0a20,20 0 1,0 40,0a20,20 0 1,0 -40,0",
                fillColor: '#000000',
                fillOpacity: 1,
                strokeColor:'#fff',
                strokeWeight: 4,
                scale: 0.5
            }
            var markerStart = new google.maps.Marker({
                position: poly.getPath().getAt(0),
                icon: start,
                map: map,
                zIndex: 200,
                scale: 1
            });
            gmarkers.push(markerStart);
            var markerEnd = new google.maps.Marker({
                position: poly.getPath().getAt(poly.getPath().getLength() - 1),
                icon: end,
                map: map,
                zIndex: 200,
                scale: 1
            });
            gmarkers.push(markerEnd);
            var icons =  this.setOptions({
            icons: [{
                icon: {
                    path: google.maps.SymbolPath.CIRCLE,
                    strokeOpacity: 1,
                    strokeColor: "#000000",
                    strokeWeight: 2,
                    scale: 4
                },
            }]});
            this.setOptions({
                strokeColor: "red",
                scale: 1,
                strokeWeight:15,
                strokeOpacity:.6
                });
​
            var contentString = "Testing";
            var infowindow = new google.maps.InfoWindow({
                    content: contentString
                });
            infowindow.open(map, markerStart);
            id = animateRoute(poly);
        });
​
        function animateRoute(line) {
          var count = 0;
          var id = window.setInterval(function() {
            count = (count + 1) % 200;
            var icons = poly.get('icons');
            icons[0].offset = (count / 2) + '%';
            poly.set('icons', icons);
          }, 60);
          return id;
        }
​
        google.maps.event.addListener(poly, 'mouseout', function() {
            removeMarkers();
            this.setOptions({strokeColor:"red",strokeWeight:4,strokeOpacity:1});
            this.setOptions( { suppressMarkers: true } );
            this.setOptions({
            icons: [{}]});
            window.clearInterval(id);
        });
​
​
     function removeMarkers(){
       for(i=0; i<gmarkers.length; i++){
         gmarkers[i].setMap(null);
       }
     }
 }
​
$(document).ready(function() {
initMap();
});
​
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>
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