如何删除折线直线并保留驱动线？

Question

 <script type="text/javascript">
            var markers = [
            {
                "title": 'Shah Alam',
            "lat": '3.068621',
            "lng": '101.518342',

        }
    ,
        {
            "title": 'Ipoh',
            "lat": '4.600050',
            "lng": '101.075641',

        }
    ,
        {
            "title": 'Putrajaya',
            "lat": '2.908764',
            "lng": '101.675053',
        }
    ,
        {
            "title": 'Seremban',
            "lat": '2.726553',
            "lng": '101.934491',
        }
    ,
        {
            "title": 'Ampang',
            "lat": '3.151621',
            "lng": '101.767996',
        }
];
    window.onload = function () {
        var mapOptions = {
            center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
            zoom: 10,
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        var map = new google.maps.Map(document.getElementById("dvMap"), mapOptions);
        var infoWindow = new google.maps.InfoWindow();
        var lat_lng = new Array();
        var latlngbounds = new google.maps.LatLngBounds();
        for (i = 0; i < markers.length; i++) {
            var data = markers[i]
            var myLatlng = new google.maps.LatLng(data.lat, data.lng);
            lat_lng.push(myLatlng);
            var marker = new google.maps.Marker({
                position: myLatlng,
                map: map,
                title: data.title
            });
            latlngbounds.extend(marker.position);
            (function (marker, data) {
                google.maps.event.addListener(marker, "click", function (e) {
                    infoWindow.setContent(data.description);
                    infoWindow.open(map, marker);
                });
            })(marker, data);
        }
        map.setCenter(latlngbounds.getCenter());
        map.fitBounds(latlngbounds);

        //***********ROUTING****************//

        //Intialize the Path Array
        var path = new google.maps.MVCArray();

        //Intialize the Direction Service
        var service = new google.maps.DirectionsService();

        //Set the Path Stroke Color
        var poly = new google.maps.Polyline({ map: map, strokeColor: '#4986E7' });

        //Loop and Draw Path Route between the Points on MAP
        for (var i = 0; i < lat_lng.length; i++) {
            if ((i + 1) < lat_lng.length) 
            {
                var src = lat_lng[i];
                var des = lat_lng[i + 1];
                path.push(src);
                poly.setPath(path);
                service.route(
                {
                    origin: src,
                    destination: des,
                    travelMode: google.maps.DirectionsTravelMode.DRIVING
                }, function (result, status) {
                    if (status == google.maps.DirectionsStatus.OK) {
                        for (var i = 0, len = result.routes[0].overview_path.length; i < len; i++) {
                            path.push(result.routes[0].overview_path[i]);
                        }
                    }
                });
            }
        }
    }
</script>

我测试了实际产生两组线的代码（一条直线和一条驱动模式线）。我想删除直线并仅保留驱动模式线。我怎么能实现这一目标？当我评论出一些线时，它只会保留直线但从未成功保留驱动模式线。

Answer 1

你做错了两件事。

1. 当你不需要时，你正在将src推到路径上
2. 您将线条合并为一条折线。路线服务是异步的，因此可能无法按预期的顺序返回行。

最简单的解决方法是为每个方向结果创建单独的折线。

//Loop and Draw Path Route between the Points on MAP
for (var i = 0; i < lat_lng.length; i++) {
  if ((i + 1) < lat_lng.length) {
    var src = lat_lng[i];
    var des = lat_lng[i + 1];
    service.route({
      origin: src,
      destination: des,
      travelMode: google.maps.DirectionsTravelMode.DRIVING
    }, function(result, status) {
      if (status == google.maps.DirectionsStatus.OK) {
        //Set the Path Stroke Color
        var poly = new google.maps.Polyline({
          map: map,
          strokeColor: '#4986E7'
        });
        //Intialize the Path Array
        var path = new google.maps.MVCArray();
        for (var i = 0, len = result.routes[0].overview_path.length; i < len; i++) {
          path.push(result.routes[0].overview_path[i]);
        }
        poly.setPath(path);
      }
    });
  }
}

proof of concept fiddle

var markers = [{
  "title": 'Shah Alam',
  "lat": '3.068621',
  "lng": '101.518342',

}, {
  "title": 'Ipoh',
  "lat": '4.600050',
  "lng": '101.075641',

}, {
  "title": 'Putrajaya',
  "lat": '2.908764',
  "lng": '101.675053',
}, {
  "title": 'Seremban',
  "lat": '2.726553',
  "lng": '101.934491',
}, {
  "title": 'Ampang',
  "lat": '3.151621',
  "lng": '101.767996',
}];
window.onload = function() {
  var mapOptions = {
    center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
    zoom: 10,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  var map = new google.maps.Map(document.getElementById("dvMap"), mapOptions);
  var infoWindow = new google.maps.InfoWindow();
  var lat_lng = new Array();
  var latlngbounds = new google.maps.LatLngBounds();
  for (i = 0; i < markers.length; i++) {
    var data = markers[i]
    var myLatlng = new google.maps.LatLng(data.lat, data.lng);
    lat_lng.push(myLatlng);
    var marker = new google.maps.Marker({
      position: myLatlng,
      map: map,
      title: data.title
    });
    latlngbounds.extend(marker.position);
    (function(marker, data) {
      google.maps.event.addListener(marker, "click", function(e) {
        infoWindow.setContent(data.description);
        infoWindow.open(map, marker);
      });
    })(marker, data);
  }
  map.setCenter(latlngbounds.getCenter());
  map.fitBounds(latlngbounds);

  //***********ROUTING****************//

  //Intialize the Direction Service
  var service = new google.maps.DirectionsService();

  // Create a new polyline, set the Path Stroke Color
  var poly = new google.maps.Polyline({
    map: map,
    strokeColor: '#4986E7'
  });

  //Loop and Draw Path Route between the Points on MAP
  for (var i = 0; i < lat_lng.length; i++) {
    if ((i + 1) < lat_lng.length) {
      var src = lat_lng[i];
      var des = lat_lng[i + 1];
      service.route({
        origin: src,
        destination: des,
        travelMode: google.maps.DirectionsTravelMode.DRIVING
      }, function(result, status) {
        if (status == google.maps.DirectionsStatus.OK) {
          //Set the Path Stroke Color
          var poly = new google.maps.Polyline({
            map: map,
            strokeColor: '#4986E7'
          });
          //Intialize the Path Array
          var path = new google.maps.MVCArray();
          for (var i = 0, len = result.routes[0].overview_path.length; i < len; i++) {
            path.push(result.routes[0].overview_path[i]);
          }
          poly.setPath(path);
        }
      });
    }
  }
}

html,
body,
#dvMap {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="dvMap"></div>

Answer 2

和google.maps.DirectionsRenderer;的变种

https://jsfiddle.net/7b4yj2ug/

易版：

var markers = [{
  "title": 'Shah Alam',
  "lat": '3.068621',
  "lng": '101.518342',
}, {
  "title": 'Ipoh',
  "lat": '4.600050',
  "lng": '101.075641',
}, {
  "title": 'Putrajaya',
  "lat": '2.908764',
  "lng": '101.675053',
}, {
  "title": 'Seremban',
  "lat": '2.726553',
  "lng": '101.934491',
}, {
  "title": 'Ampang',
  "lat": '3.151621',
  "lng": '101.767996',
}];

window.onload = function() {
  var mapOptions = {
    zoom: 10,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };

  var map = new google.maps.Map(document.getElementById('dvMap'), mapOptions);
  
  var waypts = [];
  for (i = 0; i < markers.length; i++) {
    var data = markers[i]
    var myLatlng = new google.maps.LatLng(data.lat, data.lng);
     waypts.push({       
      location: myLatlng,
     });
  }
  //***********ROUTING****************//

  //Intialize the Direction Service
  var service = new google.maps.DirectionsService();
  var directionsDisplay = new google.maps.DirectionsRenderer;
  directionsDisplay.setMap(map);
 
  //Draw Path Route between the Points on MAP
 
  service.route({
    origin: waypts[0],
    destination: waypts[waypts.length - 1],
    waypoints: waypts.slice(1, waypts.length - 1),
    optimizeWaypoints: true,
    travelMode: 'DRIVING'
  }, function(result, status) {
    if (status == google.maps.DirectionsStatus.OK)
      directionsDisplay.setDirections(result);
  });
}

/* Always set the map height explicitly to define the size of the div
 * element that contains the map. */

#dvMap,
html,
body {
  height: 100%;
}

<script src="https://maps.googleapis.com/maps/api/js"></script>
    <div id="dvMap"></div>

注意！ maximum allowed waypoints is 8 (API 3.26)

waypoints类型：数组 中间航点的数组。将通过此阵列中的每个航路点从起点到目的地计算方向。允许的最大航点为8，加上原点和目的地。 Premium Plan客户可以获得23个航点，以及起点和目的地。公交路线不支持航点。可选的。