​

function setup() {

  createCanvas(600, 600);

  background(245);

  noLoop();

}

​

function draw() {

  for (let x = 0; x < 600; x++) {

    for (let y = 0; y < 600; y++) {

      let z_real = map(x, 0, 599, -1.7, 1.7);

      let z_imag = map(y, 0, 599, 1.7, -1.7);

​

      let a = 0.37;

      let b = -0.29;

​

      for (

        iteration = 1;

        iteration <= 100 && dist(0, 0, z_real, z_imag) < 2;

        iteration++

      ) {

        let z_real_temp = z_real * z_real - z_imag * z_imag + a;

        let z_imag_temp = 2 * z_real * z_imag + b;

        z_real = z_real_temp;

        z_imag = z_imag_temp;

      }

​

      if (iteration == 101) {

        stroke(0, 0, 0);

      } else {

        let fraction = Math.tanh(iteration/100) + (iteration % 3)/10;

        let col_1 = color(0,0,150);

        let col_2 = color(255,255,255);

        stroke(lerpColor(col_2,col_1,fraction));

      }

      point(x, y);

    }

  }

}

​