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

WBOYOriginal: 2023-07-29 17:43:511282browse

Baidu Map API is a set of development interfaces that provide map display, interaction and query functions. Developers can use this interface to implement a variety of map applications. In some application scenarios, we may need to draw custom shapes on the map, such as marking specific areas or drawing driving routes. This article will introduce how to use Java to write code to draw custom shapes on the map by calling Baidu Map API.

Before we start, we need to ensure that the relevant SDK of Baidu Map API has been imported into the project, and the development key of Baidu Map API has been legally obtained.

First, we need to create a map page and load Baidu Map onto the page. The following is a simple HTML page code example:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>绘制自定义形状</title>
    <style type="text/css">
        #container {
            width: 100%;
            height: 600px;
            margin: 0 auto;
        }
    </style>
</head>
<body>
<div id="container"></div>
<script src="http://api.map.baidu.com/api?v=2.0&ak=your_baidu_map_key"></script>
<script>
    // 创建地图实例
    var map = new BMap.Map("container");
    // 设置地图中心点和缩放级别
    var point = new BMap.Point(116.404, 39.915);
    map.centerAndZoom(point, 15);
    
    // 在地图上绘制自定义形状
    // 此部分将由Java代码实现
</script>
</body>
</html>

In the above code, you need to replace your_baidu_map_key with the Baidu Map API development key you applied for.

Next, we use Java to write code to implement the method of drawing custom shapes on the map. First, we need to import the relevant Baidu Map API dependency library:

import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.OverlayOptions;
import com.baidu.mapapi.map.PolygonOptions;
import com.baidu.mapapi.model.LatLng;
import com.baidu.mapapi.overlayutil.PolygonOverlay;
import com.baidu.mapapi.overlayutil.PolygonOverlayOptions;
import com.baidu.mapapi.search.route.PlanNode;
import com.baidu.mapapi.search.route.RoutePlanSearch;
import com.baidu.mapapi.search.route.WalkingRoutePlanOption;
import com.baidu.mapapi.search.route.WalkingRouteResult;
import com.baidu.mapapi.search.route.OnGetRoutePlanResultListener;

Then, we can define a method in the Java code and call this method to draw a custom shape on the map. The following is an example method:

public class MapUtils {

    public static void drawCustomShape(BaiduMap baiduMap) {
        // 创建坐标点
        LatLng point1 = new LatLng(39.916289, 116.403857);
        LatLng point2 = new LatLng(39.917173, 116.404409);
        LatLng point3 = new LatLng(39.916199, 116.403291);

        // 构建多边形的顶点链表
        List<LatLng> points = new ArrayList<>();
        points.add(point1);
        points.add(point2);
        points.add(point3);

        // 设置多边形的填充颜色和边框颜色
        int fillColor = 0xAAFF0000; // 红色：半透明红色
        int strokeColor = 0xFF0000FF; // 蓝色：不透明蓝色

        // 创建多边形的绘制选项
        OverlayOptions polygonOptions = new PolygonOptions()
                .points(points)
                .fillColor(fillColor)
                .stroke(new Stroke(5, strokeColor));

        // 在地图上绘制多边形
        baiduMap.addOverlay(polygonOptions);
    }
}

In the above code, we first created three coordinate points as the vertices of the polygon through the LatLng class. Then, we use the PolylineOptions class to build options for drawing polygons and set properties such as the polygon's vertices, fill color, and border color. Finally, we draw the polygon onto the map by calling the addOverlay() method of BaiduMap.

Finally, in the HTML page we created above, we call the Java code to draw the custom shape in the part. The following is an example JavaScript code for calling a method:

// 在地图上绘制自定义形状
MapUtils.drawCustomShape(map);

With the above code, we can draw custom shapes on the map. According to actual needs, we can call different custom shape drawing methods as needed to achieve more complex drawing effects.

To sum up, the method of writing code in Java to draw custom shapes on the map through Baidu Map API mainly includes the following steps:

Create a map page and add Baidu The map is loaded onto the page.
In Java code, the method of drawing custom shapes is implemented by calling the relevant classes and interfaces of Baidu Map API.
Call Java methods in the JavaScript code of the HTML page to draw custom shapes.

I hope this article will help you learn how to draw custom shapes on Baidu Maps through Java code.

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