var deltaPhi = 0.1;

var delta = 10;

​

function setup() {

  createCanvas(400, 400);

  translate(width/2, height/2);

  background(255);

  stroke(0);

  smooth();

​

  strokeWeight(2);

​

​

  var x = r0;

  var y = 0;

  var r;

  // now draw a few things

  for ( r0 = 30; r0<200; r0 = r0+20) {

    noFill();

    //println(r0);

    beginShape(); 

    curveVertex(r0,0);

    curveVertex(r0,0);

   // delta = 2*pow(r0,2)/10000;

    delta = 200/r0;

    //delta = 0;

    //delta = 40/r0;

    //strokeWeight(random(0,1)*4);

    //stroke(delta*random(0,100),delta*random(0,100),delta*random(0,100));

    stroke(0,0,0);

    for (i = 0; i < (2*PI)/deltaPhi; i=i+1) {

      r = r0 + random(-1,1)*delta;

      x = r *cos(i*deltaPhi);

      y = r* sin(i*deltaPhi);

      curveVertex(x,y);

      //ellipse(x,y,3,3);

    }

    curveVertex(r0,0);

    curveVertex(r0,0);

    endShape();

  }

​

}