Rotate C

var frame_number = 0;

​

function setup() {

  createCanvas(500, 500);

  stroke(255);

  strokeWeight(3);

}

​

function draw() {

  translate(width / 2, height / 2);

  background(0);

  for(var radius = 10; radius < 250; radius += 15){

    rotate(radians(frame_number));

    for(var deg = 30; deg < 300; deg += 1){

      var x_1 = radius * cos(radians(deg));

      var y_1 = radius * sin(radians(deg));

      var x_2 = radius * cos(radians(deg + 1));

      var y_2 = radius * sin(radians(deg + 1));

      line(x_1, y_1, x_2, y_2);

    }

  }

  frame_number += 1;

}