javascript - 如何更改 Google map v3 方向上虚线的颜色

Question

我正在研究公交方向，并且已经能够使用 polylineOptions 属性更改为公交路线显示的多段线的颜色。

但是，我无法更改为步行路线显示的虚线颜色。

我确实遇到过这个解决方案，但它不适用于 v3(尝试使用 v3.22)

Similar StackOverflow Question

我在这个 JS Fiddle 中包含了一个工作示例

var directions = new google.maps.DirectionsService();
var renderer = new google.maps.DirectionsRenderer({
  polylineOptions: {
    strokeColor: '#C83939',
    strokeOpacity: 0.8,
    strokeWeight: 7
  }

});
var map, transitLayer;

function initialize() {
  var mapOptions = {
    zoom: 13,
    center: new google.maps.LatLng(40.7482333, -73.8681295),
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };

  map = new google.maps.Map(document.getElementById('map'), mapOptions);

  google.maps.event.addDomListener(document.getElementById('go'), 'click',
    route);

  var input = document.getElementById('from');
  var autocomplete = new google.maps.places.Autocomplete(input);
  autocomplete.bindTo('bounds', map);

  transitLayer = new google.maps.TransitLayer();

  var control = document.getElementById('transit-wpr');
  map.controls[google.maps.ControlPosition.TOP_RIGHT].push(control);

  google.maps.event.addDomListener(control, 'click', function() {
    transitLayer.setMap(transitLayer.getMap() ? null : map);
  });

  addDepart();
  route();
}

function addDepart() {
  var depart = document.getElementById('depart');
  for (var i = 0; i < 24; i++) {
    for (var j = 0; j < 60; j += 15) {
      var x = i < 10 ? '0' + i : i;
      var y = j < 10 ? '0' + j : j;
      depart.innerHTML += '<option>' + x + ':' + y + '</option>';
    }
  }
}

function route() {
  var departure = document.getElementById('depart').value;
  var bits = departure.split(':');
  var now = new Date();
  var tzOffset = (now.getTimezoneOffset() + 60) * 60 * 1000;

  var time = new Date();
  time.setHours(bits[0]);
  time.setMinutes(bits[1]);

  var ms = time.getTime() - tzOffset;
  if (ms < now.getTime()) {
    ms += 24 * 60 * 60 * 1000;
  }

  var departureTime = new Date(ms);

  var request = {
    origin: document.getElementById('from').value,
    destination: '51 St, New York, NY 10022, USA',
    travelMode: google.maps.DirectionsTravelMode.TRANSIT,
    provideRouteAlternatives: true,
    transitOptions: {
      departureTime: departureTime
    }
  };

  var panel = document.getElementById('panel');
  panel.innerHTML = '';
  directions.route(request, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
      renderer.setDirections(response);
      renderer.setMap(map);
      renderer.setPanel(panel);
      console.log(renderer.getDirections());
    } else {
      renderer.setMap(null);
      renderer.setPanel(null);
    }

  });

}

google.maps.event.addDomListener(window, 'load', initialize);

html,
body {
  height: 100%;
  padding: 0;
  margin: 0;
  color: black;
  font-family: arial, sans-serif;
  font-size: 13px;
}
#map {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 50%;
}
#panel-wpr {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  right: 0;
  overflow: auto;
}
#panel {
  font-family: arial;
  padding: 0 5px;
}
#info {
  padding: 5px;
}
#from {
  width: 90%;
  font-size: 1.2em;
}
.adp-directions {
  width: 100%;
}
.input {
  background-color: white;
  padding-left: 8px;
  border: 1px solid #D9D9D9;
  border-top: 1px solid silver;
  -webkit-border-radius: 1px;
  -moz-border-radius: 1px;
  border-radius: 1px;
}
.time {
  margin: 0;
  height: 17px;
  border: 1px solid;
  border-top-color: #CCC;
  border-right-color: #999;
  border-left-color: #999;
  border-bottom-color: #CCC;
  padding: 2px 15px 1px 1px;
}
button {
  border: 1px solid #3079ED;
  color: white;
  background-color: #4D90FE;
  background-image: -webkit-gradient(linear, left top, left bottom, from(#4D90FE), to(#4787ED));
  background-image: -webkit-linear-gradient(top, #4D90FE, #4787ED);
  background-image: -moz-linear-gradient(top, #4D90FE, #4787ED);
  background-image: -ms-linear-gradient(top, #4D90FE, #4787ED);
  background-image: -o-linear-gradient(top, #4D90FE, #4787ED);
  background-image: linear-gradient(top, #4D90FE, #4787ED);
  filter: progid: DXImageTransform.Microsoft.gradient(startColorStr='#4d90fe', EndColorStr='#4787ed');
  display: inline-block;
  min-width: 54px;
  text-align: center;
  font-weight: bold;
  padding: 0 8px;
  line-height: 27px;
  -webkit-border-radius: 2px;
  -moz-border-radius: 2px;
  border-radius: 2px;
  -webkit-transition: all 0.218s;
  -moz-transition: all 0.218s;
  -o-transition: all 0.218s;
  transition: all 0.218s;
}
#info div {
  line-height: 22px;
  font-size: 110%;
}
.btn {} #panel-wpr {
  border-left: 1px solid #e6e6e6;
}
#info {
  border-bottom: 1px solid #E6E6E6;
  margin-bottom: 5px;
}
h2 {
  margin: 0;
  padding: 0;
}

<title>Google Maps JavaScript API v3 Example: Transit</title>
<div id="transit-wpr">
  <button id="transit">Toggle transit layer</button>
</div>
<div id="map"></div>
<div id="panel-wpr">
  <div id="info">
    <div>
      <h2>Transit directions</h2>
    </div>
    <div>
      <label>from:</label>
      <input class="input" id="from" value="Grand Central 42, NY">
    </div>
    <div>
      <label>to:</label>
      <strong>51 St, New York, NY 10022, USA</strong>
    </div>
    <div>Depart at
      <select id="depart"></select>
    </div>
    <div class="btn">
      <button id="go">Get Directions</button>
    </div>
  </div>
  <div id="panel"></div>
</div>

我错过了任何可用的属性，或者这是不可能的？

Answer 1

这些线的选项是固定的，不会受到 DirectionsRenderer 的 polylineOptions 的影响。

这些虚线的 polylineOptions 将(当前)由 API 设置为:

{
  "icons": [{
    "icon": {
      "path": 0,
      "scale": 3,
      "fillOpacity": 0.7,
      "fillColor": "#00b3fd",
      "strokeOpacity": 0.8,
      "strokeColor": "#3379c3",
      "strokeWeight": 1
    },
    "repeat": "10px"
  }],
  "strokeColor": "#000000",
  "strokeOpacity": 0,
  "strokeWeight": 5
}

...DirectionsRenderer 的任何自定义 polylineOption 都将被忽略。

可能的解决方法(但只能为所有这些虚线设置一个固定值):

function initMap() {
     var  goo = google.maps,
          map = new goo.Map(document.getElementById('map'), {
                  zoom: 7,
                  center: {lat: 41.85, lng: -87.65}
                }),
          directionsService       = new goo.DirectionsService,
          directionsDisplay       = new goo.DirectionsRenderer({
                                      map:map,
                                      polylineOptions:{
                                        strokeColor:'red'
                                      }});
      google.maps.Polyline.prototype.setMap=(function(f,r){
      
        return function(map){
          if(
            this.get('icons')
              &&
            this.get('icons').length===1
              &&
            this.get('strokeOpacity')===0
              &&
            !this.get('noRoute')
          ){
            if(r.get('polylineOptions')&& r.get('polylineOptions').strokeColor){
              
              var icons=this.get('icons'),
                  color=r.get('polylineOptions').strokeColor;
              icons[0].icon.fillOpacity=1;
              icons[0].icon.fillColor=color;
              icons[0].icon.strokeColor=color;
              this.set('icons',icons);
          }}
        f.apply(this,arguments);
      }
      
     })(
          google.maps.Polyline.prototype.setMap,
          directionsDisplay);
    
  
  directionsService.route({
    origin: new google.maps.LatLng(52.549917, 13.42539669),
    destination: new google.maps.LatLng(52.541843, 13.4206566),
    travelMode: google.maps.TravelMode.TRANSIT
  }, function(response, status) {
    if (status === google.maps.DirectionsStatus.OK) {
      directionsDisplay.setDirections(response);
    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });
}

html, body,#map  {
        height: 100%;
        margin: 0;
        padding: 0;
      }

<div id="map"></div>
<script src="https://maps.googleapis.com/maps/api/js?callback=initMap"
        async defer></script>

它覆盖 google.maps.Polyline 的 setMap 方法

它检查是否

1. strokeOpacity 为 0
2. 存在一个带有单个图标的 IconSequence
3. 它没有 noRoute 属性(如果您自己绘制符合前两个条件的折线，请将 noRoute 选项设置为 true ，否则他们也会受到影响)

当所有 3 个条件都为真时，它将修改折线的图标属性。