​

var inc = 0.1;

var scl = 10;

var cols, rows;

​

var zoff = 0;

​

var fr;

var golden_ratio_conjugate = 0.618033988749895;

var h = 0.2;

var particles_1 = [];

var particles_2 = [];

var particles_3 = [];

var particles_4 = [];

var particles_5 = [];

var flowfield;

​

function setup() {

  createCanvas(600, 400);

  cols = floor(width / scl);

  rows = floor(height / scl);

  fr = createP('');

​

  flowfield = new Array(cols * rows);

  h += golden_ratio_conjugate;

    h %= 1;

​

  for (var i = 0; i < 3000; i++) {

    particles_1[i] = new Particle(20,12,h,0.4);

  }

    h += golden_ratio_conjugate;

    h %= 1;

  for (i = 0; i < 3000; i++) {

    particles_2[i] = new Particle(30,10,h,0.6);

  }

    h += golden_ratio_conjugate;

    h %= 1;

  for (i = 0; i < 3000; i++) {

    particles_3[i] = new Particle(40,6,h,0.7);

  }

    h += golden_ratio_conjugate;

    h %= 1;

  for (i= 0; i < 3000; i++) {

    particles_4[i] = new Particle(50,3,h,0.8);

  }  

  h += golden_ratio_conjugate;

    h %= 1;

​

  background(255);

}

​

function draw() {

​

  var yoff = 0;

  for (var y = 0; y < rows; y++) {

    var xoff = 0;

    for (var x = 0; x < cols; x++) {

      var index = x + y * cols;

      var angle = noise(xoff, yoff, zoff) * TWO_PI * 4;

      var v = p5.Vector.fromAngle(angle);

      v.setMag(1);

      flowfield[index] = v;

      xoff += inc;

      stroke(0, 50);

​

    }

    yoff += inc;

​

    zoff += 0.0003;

  }

​

  for (var i = 0; i < particles_1.length; i++) {

    particles_1[i].follow(flowfield);

    particles_1[i].update();

    particles_1[i].edges();

    particles_1[i].show();

  }

​

  for (i = 0; i < particles_2.length; i++) {

    particles_2[i].follow(flowfield);

    particles_2[i].update();

    particles_2[i].edges();

    particles_2[i].show();

  }

  for (i = 0; i < particles_3.length; i++) {

    particles_3[i].follow(flowfield);

    particles_3[i].update();

    particles_3[i].edges();

    particles_3[i].show();

  }

​

  for (i = 0; i < particles_4.length; i++) {

    particles_4[i].follow(flowfield);

    particles_4[i].update();

    particles_4[i].edges();

    particles_4[i].show();

  }

​

  for (i = 0; i < particles_5.length; i++) {

    particles_5[i].follow(flowfield);

    particles_5[i].update();

    particles_5[i].edges();

    particles_5[i].show();

  }

​

}