Use JavaScript and Tencent Maps to implement map route editing function

Use JavaScript and Tencent Maps to implement map route editing function

With the rapid development of the Internet, map applications have become one of the indispensable tools in our daily lives. . In map applications, the route editing function is a very practical and common function. This article will introduce how to use JavaScript and Tencent Maps to implement the map route editing function, and provide specific code examples.

Tencent Maps is one of the outstanding map APIs in China, providing rich map display, search and navigation functions. Through the JavaScript API of Tencent Maps, we can easily implement map functions in web pages.

First, we need to introduce the JavaScript API of Tencent Maps into the web page. You can add the following code in the

tag of HTML:

<script src="https://map.qq.com/api/js?v=2.exp&key=YOUR_API_KEY"></script>

Among them, YOUR_API_KEY needs to be replaced with the API key you applied for on the Tencent Map Open Platform.

Next, we need to create a map container to display the map. Add a

element as a map container in the tag of HTML, for example:

<div id="mapContainer" style="width: 800px; height: 600px;"></div>

Then, we can use the Tencent Map API in JavaScript to create a map. Here is a simple example:

// 初始化地图
var map = new qq.maps.Map(document.getElementById("mapContainer"), {
  center: new qq.maps.LatLng(39.9042, 116.4074), // 地图中心点坐标
  zoom: 13, // 缩放级别
});

// 创建一个空的折线对象
var polyline = new qq.maps.Polyline({
  strokeColor: "#f00", // 折线颜色
  strokeWeight: 3, // 折线宽度
  editable: true, // 可编辑
});

// 将折线添加到地图中
polyline.setMap(map);

In the above code, we create a map object and create an editable polyline object on the map. The polyline is red by default, has a width of 3 pixels, and can be edited by dragging it with the mouse.

In addition to the above basic functions, we can also add some additional functions to improve the map route editing experience. For example, add the ability to drag points to change the shape of a polyline. The following is a complete example:

var map = new qq.maps.Map(document.getElementById("mapContainer"), {
  center: new qq.maps.LatLng(39.9042, 116.4074),
  zoom: 13,
});

var polyline = new qq.maps.Polyline({
  strokeColor: "#f00",
  strokeWeight: 3,
  editable: true,
});

polyline.setMap(map);

// 添加拖动点的功能
qq.maps.event.addListener(polyline, 'lineupdate', function (event) {
  var path = polyline.getPath();
  var markers = polyline.getMarkers();

  // 清除原来的拖动点
  for (var i = 0; i < markers.length; i++) {
    markers[i].setMap(null);
  }

  // 添加新的拖动点
  for (var i = 0; i < path.length; i++) {
    var marker = new qq.maps.Marker({
      draggable: true,
      position: path[i],
      map: map,
    });

    // 监听拖动点的位置改变事件
    qq.maps.event.addListener(marker, "position_changed", function () {
      var newPath = [];
      var newMarkers = polyline.getMarkers();

      // 更新折线路径和拖动点位置
      for (var j = 0; j < newMarkers.length; j++) {
        newPath.push(newMarkers[j].getPosition());
      }

      polyline.setPath(newPath);
    });

    polyline.addMarker(marker);
  }
});

In the above code, we update the shape of the polyline in real time by listening to the lineupdate event, and create/update the drag point based on the latest polyline path .

Through the above code, we have implemented a simple map line editing function. Users can drag the vertices of the polyline with the mouse to change its shape, and can add/delete vertices on the polyline.

To sum up, it is very simple to use JavaScript and Tencent Maps to implement the map route editing function. By using Tencent Maps' API, we can easily create map objects and polyline objects, and provide rich methods to edit and manage polylines. I hope this article can help you understand how to implement the map route editing function and provide specific code examples for your reference.

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