Google 路线 API - 新请求后路线模糊

Question

here is a picture with the problem.

我正在使用 Vue.js 来使用 REST API 来发送有关即将到来的总线传输的数据。在上面的图片中，每个列表项代表一个转移，当点击时，地图应该显示路线。 当从小到大切换时没问题，但当我切换到较短的路线时，指示它的蓝线显得模糊并且比正常大。当我缩放 in/out 时问题消失了，它只是初始显示。

我在每次新请求后都在地图对象上尝试了 setZoom(int) 函数，但是没有用。

下面是 Vue 实例的相关代码：

methods: {
     ...
        calcRoute() {
          const request = {
            origin: this.start,
            destination: this.end
          }

          this.directionsService.route(request, (result, status) => {
            if (status == 'OK') {
              this.directionsRenderer.setDirections(result);
               //this.map.setZoom(12);
            }
          })
        }
},
watch: {
      start: () => {
        if (this.end && this.start) {
          this.calcRoute();
        }
      },
       ...
    }

编辑：按照建议，我提供了一个运行代码片段。单击更改方向按钮查看问题。

编辑 2：为了简单起见，我用纯 JS 实现了它

编辑 3：提供您的 API KEY

const transfers = [{
  "id": 29,
  "date": "2020-02-12T08:00:00.000Z",
  "pick_up": "Sofia Airport, Terminal 1",
  "drop_off": "Stara Zagora",
  "driver": "СТ",
  "vehicle": 6264,
},
{
  "id": 43,
  "date": "2020-02-13T08:30:00.000Z",
  "pick_up": "Sofia Terminal 1",
  "drop_off": "Boutique One Hotel Sofia",
  "driver": "СТ",
  "vehicle": 6264,
}];

let map, directionsService, directionsRenderer;
let selectedTrans = 0;

window.addEventListener('load', function() {
  map = new google.maps.Map(document.getElementById("map"), {
    zoom: 7,
    center: {
      lat: 42.698334,
      lng: 23.319941
    }
  });
  directionsService = new google.maps.DirectionsService();
  directionsRenderer = new google.maps.DirectionsRenderer();
  directionsRenderer.setMap(map);
  calcRoute();
});

function calcRoute() {
  const start = transfers[selectedTrans].pick_up;
  const end= transfers[selectedTrans].drop_off;
  const request = {
    origin: start,
    destination: end,
    travelMode: 'DRIVING'
  };

  directionsService.route(request, (result, status) => {
    if (status == 'OK') {
      directionsRenderer.setDirections(result);
    }
  })
}

document.getElementById('changeDirectionsBtn').addEventListener('click', () => {
  selectedTrans = selectedTrans == 0 ? 1 : 0;
  calcRoute();
});

#map {
  height: 100%;
}

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

<button id="changeDirectionsBtn"> Change Directions </button>
<div id="map">
</div>
<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY" defer></script>

Answer 1

有空的时候我需要进一步调查一下...

文档提到

Because the renderer is an MVCObject, it will automatically detect any changes to its properties and update the map when its associated directions have changed.

我不确定这到底是什么意思。

也就是说，只需在计算新路由之前调用 directionsRenderer.setMap(null); 并在回调中调用 directionsRenderer.setMap(map); 即可解决问题。请参阅下面的代码段。

const transfers = [{
  "id": 29,
  "date": "2020-02-12T08:00:00.000Z",
  "pick_up": "Sofia Airport, Terminal 1",
  "drop_off": "Stara Zagora",
  "driver": "СТ",
  "vehicle": 6264,
},
{
  "id": 43,
  "date": "2020-02-13T08:30:00.000Z",
  "pick_up": "Sofia Terminal 1",
  "drop_off": "Boutique One Hotel Sofia",
  "driver": "СТ",
  "vehicle": 6264,
}];

let map, directionsService, directionsRenderer;
let selectedTrans = 0;

window.addEventListener('load', function() {
  map = new google.maps.Map(document.getElementById("map"), {
    zoom: 7,
    center: {
      lat: 42.698334,
      lng: 23.319941
    }
  });
  
  directionsService = new google.maps.DirectionsService();
  directionsRenderer = new google.maps.DirectionsRenderer();
  
  calcRoute();
});

function calcRoute() {

  directionsRenderer.setMap(null);

  const start = transfers[selectedTrans].pick_up;
  const end= transfers[selectedTrans].drop_off;
  const request = {
    origin: start,
    destination: end,
    travelMode: 'DRIVING'
  };

  directionsService.route(request, (result, status) => {
    if (status == 'OK') {
      directionsRenderer.setDirections(result);
      directionsRenderer.setMap(map);
    }
  })
}

document.getElementById('changeDirectionsBtn').addEventListener('click', () => {
  selectedTrans = selectedTrans == 0 ? 1 : 0;
  calcRoute();
});

#map {
  height: 100%;
}

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

<button id="changeDirectionsBtn"> Change Directions </button>
<div id="map">
</div>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk" defer></script>

Google 路线 API - 新请求后路线模糊

Google Directions API - Route is blurred after a new request

javascript

google-maps

google-maps-api-3

google-directions-api

vue.js