射线法判断点在多边形或矩形内：Java实现

    
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    public static boolean isInRectangle(Vector2D pointA, Vector2D pointB, Vector2D point)
    {
        List<Vector2D> polygon = new ArrayList<Vector2D>();
        polygon.add(pointA);
        polygon.add(new Vector2D(pointA.getX(), pointB.getY()));
        polygon.add(pointB);
        polygon.add(new Vector2D(pointB.getX(), pointA.getY()));
        return  CalcPointPolygonRelation(point, polygon);
    }

    private static double Distance(double lon1, double lat1, double lon2, double lat2)
    {
        double R = 6378137; //地球半径
        lat1 = lat1 * Math.PI / 180.0;
        lat2 = lat2 * Math.PI / 180.0;
        double sa2 = Math.sin((lat1 - lat2) / 2.0);
        double sb2 = Math.sin(((lon1 - lon2) * Math.PI / 180.0) / 2.0);
        return 2 * R * Math.asin(Math.sqrt(sa2 * sa2 + Math.cos(lat1) * Math.cos(lat2) * sb2 * sb2));
    }

     // cPoint 圆心坐标
     // cRadius 圆半径
     // point 当前点
    public static boolean isInCircle(Vector2D cPoint, double cRadius, Vector2D point)
    {
        double distance = Distance(cPoint.getX(), cPoint.getY(), point.getX(), point.getY());
        return distance <= cRadius;