public static double rotateX(double x,double y,double a){
        a=a % 360;
        a=(a*Math.PI) /180;
        return x*Math.cos(a)+y*Math.sin(a);
    }
    public static double rotateY(double x,double y,double a){
        a=a % 360;
        a=(a*Math.PI) /180;
        return y*Math.cos(a)-x*Math.sin(a);
    }