围栏转化

圆形围栏转多边形围栏

java版，圆形围栏转成多边形围栏时使用

public static double Ea = 6378137; // 赤道半径 public static double Eb = 6356725; // 极半径 public static Point GetJWDB(double GLON,double GLAT,double distance,double angle){ double dx = distance * Math.sin(angle * Math.PI / 180.0); double dy = distance * Math.cos(angle * Math.PI / 180.0); //double ec = 6356725 + 21412 * (90.0 - GLAT) / 90.0; // 21412 是赤道半径与极半径的差 double ec = Eb + (Ea-Eb) * (90.0 - GLAT) / 90.0; double ed = ec * Math.cos(GLAT * Math.PI / 180); double bjd = (dx / ed + GLON * Math.PI / 180.0) * 180.0 / Math.PI; double bwd = (dy / ec + GLAT * Math.PI / 180.0) * 180.0 / Math.PI; return new Point(bjd, bwd); } public static List<Point> getCirclePoints(PGcircle circle){ List<Point> points=new ArrayList<>(); Point circleCenter=new Point(circle.center.x,circle.center.y); for(int i=0;i<360;i=i+30){ Point p = GetJWDB(circleCenter.x,circleCenter.y,circle.radius,i); points.add(p); } points.add(points.get(0)); return points; } ```