function setup() { 

  createCanvas(windowWidth, windowHeight);

  background(0);

    noFill();

    stroke(255);

    for(var t = 0; t < TWO_PI; t+= 0.5) {

    var x = cos(t)*width/4 + width/2;

    var y = sin(t)*width/4 + height/2;

​

    push();

    translate(x, y);

    rotate(PI/2);

    line(-((width/2)-x), -((height/2)-y), 0, 0);    

    translate(-((width/2)-x), -((height/2)-y));

    push();

    rotate(t+PI/2);

    line(0, 0, 10, 10);

    pop();

    rotate(t-PI);

    line(0, 0, 10, 10);

    pop();

    }

    ellipse(width/2, height/2, width/2, width/2);

} 

​

​