Triangle Drawing not repeating for recursion code

Question

I am writing a recursion code for my triangle drawing. For some reason, it wont do the recursion, but it will do the base drawing. Would like some help in figuring out why my code isn't repeating. Also, if someone could help me figure out how to fill the triangles with a color, that would be much appreciated.

public class Triangle {
     public static void draw(int n, double size, double x, double y) {
        if (n == 0) return;
        StdDraw.setPenColor(StdDraw.BLUE);
        
        StdDraw.setPenColor(StdDraw.BLACK);
        //StdDraw.line(xy, size/2)

       double x1 = x + size/2;
       double y1 = y + size/2; 
       double x2 = x1+ size/2;
       
       // bottom triangle
       StdDraw.line(x,y, x1, y1);
       StdDraw.line(x1, y1, x2, y );
       StdDraw.line(x2, y, x1, y);
       //right triangle
       StdDraw.line(y, y, x2, x2);
       StdDraw.line(x1, x1, x1, y1);
       
       // top triangle and left triangle
       StdDraw.line(y1, x1, x, x2);
       StdDraw.line(x2, x2, x, y);
      
       draw(n-1, size -3, x, y);
       
    }

public static void main(String[] args) {
    double x = 0.0;
    double y = 0.0;
    double size = 1.0;
    int n = 2;
    
    draw(n, size, x, y);    
}

}