根据线路获取线路的辐射区

项目中需要通过一条线路，计算一个在辐射范围内包含该线路的图形。使用JTS包计算缓冲区即可得到。

1.引入依赖

<!-- jts依赖-->
<dependency>
        <groupId>com.vividsolutions</groupId>
        <artifactId>jts-core</artifactId>
        <version>1.14.0</version>
</dependency>
<!--解析字符串-->
<dependency>
        <groupId>cn.hutool</groupId>
        <artifactId>hutool-all</artifactId>
        <version>5.7.1</version>
</dependency>

2.调用buffer方法获得结果

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONArray;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;

import java.util.List;

/**
 * 获取缓冲区
 */
public class Mytest {
    public static void main(String[] args) {
        String position = "[113.2136306762695,23.2724609375],[113.2136001586914,23.27313613891602],[113.2136001586914,23.27411651611328],[113.2136154174805,23.27562141418457],[113.2136154174805,23.27562141418457],[113.2136459350586,23.27606582641602],[113.2136459350586,23.27606582641602],[113.2151107788086,23.27617835998535],[113.2151107788086,23.27617835998535],[113.2170639038086,23.27627754211426],[113.2213287353516,23.27650451660156],[113.2219467163086,23.27655601501465]";
        JSONObject jsonObject = JSONUtil.parseObj("{\"type\":\"LineString\",\"coordinates\":["+ position +"]}");
        JSONArray jsonArray = jsonObject.getJSONArray("coordinates");
        Coordinate coorArr[] = new Coordinate[jsonArray.size()];
        //封装数据
        for (int i = 0; i < jsonArray.size(); i++){
            String pointArr[] = jsonArray.get(i).toString().replace("[", "").replace("]", "").split(",");
            if (pointArr != null && pointArr.length == 2){
                Coordinate coord = new Coordinate(Double.parseDouble(pointArr[0]),Double.parseDouble(pointArr[1]));
                coorArr[i]=coord;
            }
        }
        GeometryFactory geoFac = new GeometryFactory();
        LineString createLineString = geoFac.createLineString(coorArr);
        // 距离转换角度 = meter / (2*Math.PI*6371004)*360 
        //线路附近100米范围
        Geometry buffer = createLineString.buffer(100 / (2*Math.PI*6371004)*360);
        
        //将结果封装返回
        String subBetween = StrUtil.subBetween(buffer.toString(),"((", "))");
        List<String> split = StrUtil.split(subBetween, ", ");
        String result = "";
        for (String item: split) {
            List<String> split1 = StrUtil.split(item, " ");
            String temp  = "["+ split1.get(0) +"," + split1.get(1) +"]" +",";
            result = result + temp;
        }
        System.out.println(result);

    }
}

3.效果

4.参考资料

1. 根据折线经纬度获取的折线平行线：https://www.cnblogs.com/seeyou1993/p/11474082.html

2. Turf.js：http://turfjs.org/docs/#buffer

3. 高德地图轨迹回放：https://lbs.amap.com/demo/javascript-api/example/marker/replaying-historical-running-data