// http://codingtra.in

// http://patreon.com/codingtrain

// Code for: https://youtu.be/6z7GQewK-Ks

​

let minScale = -2.5;

//let maxScale = Math.abs(minScale);

let maxScale = 2;

let minSet = 0;

let maxSet = 500;

​

function setup() {

  createCanvas(500, 500);

  pixelDensity(1);

}

​

function draw() {

  let maxiterations = 150;

​

  loadPixels();

  for (let x = minSet; x < maxSet; x++) {

    for (let y = minSet; y < maxSet; y++) {

​

      let a = map(x, minSet, maxSet, minScale, maxScale);

      let b = map(y, minSet, maxSet, minScale, maxScale);

​

      let ca = a;

      let cb = b;

​

      let n = 0;

​

      while (n < maxiterations) {

        let aa = a * a - b * b;

        let bb = 2 * a * b;

        a = aa + ca;

        b = bb + cb;

        if (a * a + b * b > 8) {

          break;

        }

        n++;

      }

​

      let bright = map(n, 0, maxiterations, 0, 255);

      let brightR = bright;

      let brightG = bright;

      let brightB = bright;

      if( n < maxiterations/3){

        brightB += 112; 

      }else if( n < maxiterations /2 ){

        brightG += 50;

      }else if (n > maxiterations / 2){

        brightR += 100;

      }

​

      if (n == maxiterations) {

        brightR = 0;

        brightG = 0;

        brightB = 0;

      }

​

      let pixX = map(x, minSet, maxSet, 0, width);

      let pixY = map(y, minSet, maxSet, 0, height);

      let pix = (pixX + pixY * width) * 4;

      pixels[pix + 0] = brightR;

      pixels[pix + 1] = brightG;

      pixels[pix + 2] = brightB;

      pixels[pix + 3] = 255;

    }

  }

  updatePixels();

​

  // minScale += 0.1;

  // maxScale += 0.1;

  // minSet += 1;

  // maxSet += 1;

  noLoop();

}