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

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

Baidu Map API is a very commonly used map development interface that can be used to implement many interesting and practical functions. One of them is to draw a circular area on the map. The following will introduce how to use Java to write code to implement this function.

First, we need to introduce Baidu Map’s Java SDK and create a map object.

import com.baidu.mapapi.map.*;
import com.baidu.mapapi.model.LatLng;
import com.baidu.mapapi.model.LatLngBounds;
import com.baidu.mapapi.model.LatLngBounds.Builder;
import com.baidu.mapapi.overlayutil.*;
import com.baidu.mapapi.utils.DistanceUtil;

public class CircleOverlayDemo extends AppCompatActivity {

    private BaiduMap mBaiduMap;
    private MapView mMapView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_circle_overlay_demo);

        mMapView = findViewById(R.id.bmapView);
        mBaiduMap = mMapView.getMap();

    }
}

Next, we need to add a circular overlay to the map. In the Baidu Map API, you can use the OverlayOptions object to define the properties of the overlay.

    private void addCircle(LatLng centerPoint, int radius) {
        //设置圆形的属性
        CircleOptions circleOptions = new CircleOptions()
                .center(centerPoint) //设置圆心位置
                .radius(radius) //设置半径
                .fillColor(0x80ff0000) //设置填充颜色
                .stroke(new Stroke(2, 0xAA000000)); //设置边框

        //添加圆形覆盖物到地图上
        mBaiduMap.addOverlay(circleOptions);
    }

In the above code, we set the center position (centerPoint) and radius (radius) of the circular cover, and set the fill color and border style.

Finally, we call this method after the map initialization is completed and pass in the center position and radius to draw a circular area on the map.

    @Override
    public void onMapLoaded() {
        //地图初始化完成后，添加圆形覆盖物
        LatLng centerPoint = new LatLng(39.915, 116.404); //圆心位置
        int radius = 1000; //圆的半径，单位：米
        addCircle(centerPoint, radius);
    }

In the above code, we set the center point of the circle (centerPoint) to the coordinates of the center of Beijing (39.915, 116.404), and set the radius of the circle to 1000 meters.

Through the above steps, we have successfully implemented the function of drawing a circular area on the map through Baidu Map API. When the code runs, you will see a red circle with a radius of 1000 meters on the map.

I hope this article will help you understand how to use Java to write code to draw a circular area on the map through Baidu Map API. If you have any questions, please feel free to discuss them.

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