// http://codingtra.in

// http://patreon.com/codingtrain

// Code for this video: https://youtu.be/flQgnCUxHlw

​

var r = 4;

var k = 30;

var grid = [];

var w = r / Math.sqrt(2);

var active = [];

var cols, rows;

var ordered = [];

​

function setup() {

  createCanvas(400, 400);

  background(0);

  strokeWeight(4);

  colorMode(HSB);

​

  // STEP 0

  cols = floor(width / w);

  rows = floor(height / w);

  for (var i = 0; i < cols * rows; i++) {

    grid[i] = undefined;

  }

​

  // STEP 1

  var x = width / 2;

  var y = height / 2;

  var i = floor(x / w);

  var j = floor(y / w);

  var pos = createVector(x, y);

  grid[i + j * cols] = pos;

  active.push(pos);

  //frameRate(1);

  while (active.length > 0){

    calcP();

  }

}

​

function calcP() {

​

    var randIndex = floor(random(active.length));

    var pos = active[randIndex];

​

    var r2 = map(pos.x, 0, 100, 5,120);

  console.log(r2)

​

    var found = false;

    for (var n = 0; n < k; n++) {

      var sample = p5.Vector.random2D();

      var m = random(r, 2 * r);

      sample.setMag(m);

      sample.add(pos);

​

      var col = floor(sample.x / w);

      var row = floor(sample.y / w);

​

      if (col > -1 && row > -1 && col < cols && row < rows && !grid[col + row * cols]) {

        var ok = true;

        for (var i = -1; i <= 1; i++) {

          for (var j = -1; j <= 1; j++) {

            var index = (col + i) + (row + j) * cols;

            var neighbor = grid[index];

            if (neighbor) {

              var d = p5.Vector.dist(sample, neighbor);

              if (d < r2) {

                ok = false;

              }

            }

          }

        }

        if (ok) {

          found = true;

          grid[col + row * cols] = sample;

          active.push(sample);

          ordered.push(sample);

          // Should we break?

          break;

        }

      }

    }

​

    if (!found) {

      active.splice(randIndex, 1);

    }

​

​

}

​

function draw() {

  background(0);

  //noLoop();

​

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

    if (ordered[i]) {

      stroke(255);

      strokeWeight(r * 0.25);

      point(ordered[i].x, ordered[i].y);

    }

  }

​

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

  //   stroke(255, 0, 255);

  //   strokeWeight(1);

  //   point(active[i].x, active[i].y);

  // }

  //console.log(active.length);

}