Black Hole 2

// By Roni Kaufman

const COL = createCols("https://coolors.co/generate/2a2d34-009ddc-f26430-6761a8-009b72");

let kMax;

let step;

let n = 250; // number of blobs

let radius = 80; // diameter of the circle

let inter = 0.05; // difference between the sizes of two blobs

let maxNoise = 500;

​

let noiseProg = (x) => (x*x);

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  // colorMode(HSB, 1);

  angleMode(DEGREES);

  noFill();

  noLoop();

  kMax = random(0.5, 1);

  step = 0.01;

}

​

function draw() {

  background('#1828af');

  for (let i = 0; i < n; i++) {

    let alpha = 1 - noiseProg(i / n);

    stroke(COL[int(random(COL.length))]);

    let size = radius + i * inter;

    let k = kMax * sqrt(i/n);

    let noisiness = maxNoise * noiseProg(i / n);

    blob(size, width/2, height/2, k, i * step, noisiness);

  }

}

​

function blob(size, xCenter, yCenter, k, t, noisiness) {

  beginShape();

  let angleStep = 360 / 500;

  for (let theta = 0; theta < 360; theta += angleStep) {

    let r1, r2;

    /*

    if (theta < PI / 2) {

      r1 = cos(theta);

      r2 = 1;

    } else if (theta < PI) {

      r1 = 0;

      r2 = sin(theta);

    } else if (theta < 3 * PI / 2) {

      r1 = sin(theta);

      r2 = 0;

    } else {

      r1 = 1;

      r2 = cos(theta);

    }

    */

    r1 = cos(theta)+1;

    r2 = sin(theta)+1;

    let r = size + noise(k * r1,  k * r2, t) * noisiness;

    let x = xCenter + r * cos(theta);

    let y = yCenter + r * sin(theta);

    curveVertex(x, y);

  }

  endShape(CLOSE);

}

function createCols(_url) {

  let slash_index = _url.lastIndexOf('/');

  let pallate_str = _url.slice(slash_index + 1);

  let arr = pallate_str.split('-');

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

    arr[i] = '#' + arr[i];

  }

  return arr;

}