squares recursively from zero++ limited by max size

squares.pde

public void settings() {
        //size(800,600);
        fullScreen(P2D);
    }
 

public void setup(){
  
}

    public void draw(){
        
        background(0);
        noFill();
        drawCircle(width/2, height/2, 0);
        frameRate(30);
    }

    void drawCircle(int x , int y, float radius){
        ellipseMode(CENTER);
        rectMode(CENTER);
        float off = 1+sin(radians(frameCount/5f));   
        
        stroke(89,121,214);
        rect(x-radius/2,y-radius/2, radius*off, radius*off);
        rect(x+radius/2,y+radius/2, radius*off, radius*off);
        rect(x+radius/2,y-radius/2, radius*off, radius*off);
        rect(x-radius/2,y+radius/2, radius*off, radius*off);
        
        float step = -PI*10;
        if(radius<width/2){
            drawCircle(x, y, radius-step);
        }
    }