java求多个坐标多边形的中心点

小灰灰 2024-03-23 12:05 73阅读 0赞

import java.math.BigDecimal;
    import java.text.DecimalFormat;
    import java.util.HashMap;
    import java.util.Map;
    
    /**
     * @Date 2023/4/12
     * @remark
     */
    public class Test {
    
     public static void main(String[] args) {
            String lng_lat = "118.123214,33.363985;118.130634,33.364412;118.130203,33.360401;118.127867,33.360733;118.127903,33.364683;";
            Map <String,String>  map = getCenterPoint(lng_lat);
            System.out.println("中心点"+map.get("lng") +","+ map.get("lat"));
        }
    
        /**
         * 获取多边形中心点
         */
        public static Map<String, String> getCenterPoint(String str) {
            String[] arr = str.split(";");
            int total = arr.length;
            double X = 0, Y = 0, Z = 0;
            for (int i = 0; i < arr.length; i++) {
                double lat, lon, x, y, z;
                lon = Double.parseDouble(arr[i].split(",")[0]) * Math.PI / 180;
                lat = Double.parseDouble(arr[i].split(",")[1]) * Math.PI / 180;
                x = Math.cos(lat) * Math.cos(lon);
                y = Math.cos(lat) * Math.sin(lon);
                z = Math.sin(lat);
                X += x;
                Y += y;
                Z += z;
            }
    
            X = X / total;
            Y = Y / total;
            Z = Z / total;
            double Lon = Math.atan2(Y, X);
            double Hyp = Math.sqrt(X * X + Y * Y);
            double Lat = Math.atan2(Z, Hyp);
            DecimalFormat df = new DecimalFormat("#0.000000");
            Map<String, String> map = new HashMap<>();
            map.put("lng", df.format(Lon * 180 / Math.PI));
            map.put("lat", df.format(Lat * 180 / Math.PI));
            return map;
        }
    
    }