createCanvas(400, 400);

}

​

function draw() {

  background(200,200,0);

  translate(width/2,height/2)

  draw_circle();

}

​

function draw_circle() {

  var steps = 360;

  var r1 = 70;

  var r2 = 80;

  var ang = 2.0*PI/steps;

  var r3 = 7;

  var r4 = 7;

  var h1 = 11; // harmonic

  noFill();

  stroke(0,200,0);

  strokeWeight(2);

  beginShape();

  for (var i = 0; i < 360;i++) {

    var x = r1*cos(ang*i)+r3*cos(ang*i*h1);

    var y = r2*sin(ang*i)+r4*sin(ang*i*h1);

    vertex(x,y);

  }

  endShape(CLOSE);

}

​