What is the method to write code in Java to draw administrative division boundaries on the map through Baidu Map API?

What is the method to write code in Java to draw administrative division boundaries on the map through Baidu Map API?

Baidu Map API provides a wealth of functions, including drawing administrative division boundaries on the map. By writing code in Java, we can implement the function of drawing the boundaries of specified administrative divisions on the map. Next, I will introduce the implementation method in detail and provide corresponding code examples.

First, you need to apply for a developer account on the Baidu Map Open Platform and create a new application to obtain an API key. You can then use Baidu Maps' JavaScript API to draw administrative division boundaries on the map. The following are the steps to implement the method:

1. Introduce the JavaScript file of Baidu Map API:

   <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的API密钥"></script>

   Copy after login

2. Create the map container:

   <div id="map" style="width: 100%; height: 400px;"></div>

   Copy after login

3. Initialize the map in JavaScript and set the center point and zoom level:

   var map = new BMap.Map("map"); // 创建地图实例
   var point = new BMap.Point(116.404, 39.915); // 设置中心点坐标
   map.centerAndZoom(point, 12); // 初始化地图，设置缩放级别

   Copy after login

4. Draw the boundaries of administrative divisions:

   var boundary = new BMap.Boundary();
   boundary.get("北京市海淀区", function (rs) { // 替换为您要绘制的行政区划
    var count = rs.boundaries.length; // 行政区域的个数
    for (var i = 0; i < count; i++) {
        var polygon = new BMap.Polygon(rs.boundaries[i], {strokeWeight: 2, strokeColor: "#ff0000", fillOpacity: 0.2}); // 创建多边形
        map.addOverlay(polygon); // 添加覆盖物到地图中
    }
   });

   Copy after login

In the above code example, we obtain the boundary information of administrative divisions through the BMap.Boundary() object. The first parameter of the get method is the name of the administrative division whose boundary information is to be obtained, which can be modified according to actual needs. In the callback function, we create a polygon through BMap.Polygon() and set its style, and then add the polygon to the map through the map.addOverlay() method to realize the function of drawing administrative division boundaries.

It is worth noting that in actual development, you may need to use the code of the administrative division instead of the name of the administrative division. Baidu Maps provides administrative division boundary data services. You can use the administrative division boundary query interface to obtain relevant data.

To sum up, by using Java to write code, we can realize the function of drawing administrative division boundaries on the map through Baidu Map API. I hope this introduction will be helpful to you.

Reference materials:

• Baidu Map Open Platform: http://lbsyun.baidu.com/
• Baidu Map JavaScript API Document: http://lbsyun .baidu.com/index.php?title=jspopular3.0
• Baidu map administrative division boundary query interface: http://lbsyun.baidu.com/index.php?title=lbscloud/api/district

The above is the detailed content of What is the method to write code in Java to draw administrative division boundaries on the map through Baidu Map API?. For more information, please follow other related articles on the PHP Chinese website!