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

WBOYOriginal: 2023-07-30 17:59:001678browse

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

Baidu Map API provides a wealth of functions that can perform various operations on the map. Among them, drawing trajectories is a common requirement. This article will introduce how to use Java to write code and draw tracks on the map through Baidu Map API.

First of all, you need to prepare the following conditions:

Java development environment: Make sure that the Java development environment has been installed.
Baidu Map Open Platform Account: Register for a Baidu Map Open Platform account, create an application and obtain a developer key (ak).

Next, we will use the Baidu Map JavaScript API and Java back-end code to complete the trajectory drawing.

Step 1: Create the basic web page structure
First, create an HTML file (such as index.html) in your project and add the following basic web page structure:

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <style>
        #map {
            width: 100%;
            height: 500px;
        }
    </style>
</head>

<body>
    <div id="map"></div>

    <script type="text/javascript" src="http://api.map.baidu.com/api?v=3.0&ak=你的开发者密钥"></script>
    <script type="text/javascript" src="http://api.map.baidu.com/library/DrawingManager/1.4/src/DrawingManager.js"></script>

    <script>
        // 在这里编写JavaScript代码
    </script>
</body>

</html>

In this code, we set up a div with the id map for the map container, and introduced Baidu Map's JavaScript API and DrawingManager library.

Step 2: Add code in JavaScript
In the 3f1c4e4b6b16bbbd69b2ee476dc4f83a tag in the above code, we can add the following JavaScript code to draw the trajectory:

// 创建地图
var map = new BMap.Map("map");
var point = new BMap.Point(116.404, 39.915);
map.centerAndZoom(point, 15);

// 启用鼠标绘制工具
var drawingManager = new BMapLib.DrawingManager(map, {
    isOpen: true, // 是否开启绘制模式
    enableDrawingTool: true, // 是否显示工具栏
    drawingToolOptions: {
        anchor: BMAP_ANCHOR_TOP_RIGHT, // 工具栏位置
        offset: new BMap.Size(5, 5), // 偏离值
    },
    polylineOptions: {
        strokeColor: "#FF0000", // 线颜色
        strokeWeight: 5, // 线宽度
    }
});

// 添加绘制完成事件
drawingManager.addEventListener("overlaycomplete", function(e) {
    var overlay = e.overlay;
    if (overlay instanceof BMap.Polyline) {
        var path = overlay.getPath();
        // 在这里可以获取到绘制的轨迹路径，并将其发送到后端进行保存
        console.log(path);
    }
});

In the above code, First, a map object is created, and the center point and zoom level are set. Then, by instantiating the DrawingManager object, the mouse drawing tool is enabled and the toolbar's position and properties are set.

In the listening function of the drawing completion event, we can obtain the drawn trajectory path and send it to the backend for saving. In the example, we use the console.log method to output to the console.

Step 3: Start the service
Place the above HTML file in a Web container (such as Tomcat), start the service, and access the HTML file.

Now, you can use the mouse drawing tool on the map to draw a trajectory. After the drawing is completed, the coordinate points of the trajectory can be viewed in the console.

Through the above steps, we have implemented the method of drawing tracks on the map through Baidu Map API. You can modify and optimize based on the code to meet your needs.

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