let fade;

let fadeAmount = 1

let coordinates = [];

let fractalNum = [];

let crystalNum = 40;

​

function setup() {

  createCanvas(500, 500);

  CrystalCoord(crystalNum);

  fade = 0;

}

​

function draw() {

  background(0);

  for(let i=0; i<crystalNum; i++) {

    push();

    translate(coordinates[i], coordinates[i+1]);

    drawCrystal(fractalNum[i]);

    pop();

  }

​

  push();

  translate(width/2, height/2);

  drawCrystal(10);

  pop();

}

​

function star(x, y, radius1, radius2, npoints) {

  let angle = TWO_PI / npoints;

  let halfAngle = angle / 2.0;

  beginShape();

  for (let a = 0; a < TWO_PI; a += angle) {

    let sx = x + cos(a) * radius2;

    let sy = y + sin(a) * radius2;

    vertex(sx, sy);

    sx = x + cos(a + halfAngle) * radius1;

    sy = y + sin(a + halfAngle) * radius1;

    vertex(sx, sy);

  }

  endShape(CLOSE);

}

​

function drawCrystal(spin) {  

  for(let i=0; i<spin; i++) {

    rotate(frameCount/-1000);

    if (fade<0) fadeAmount=0.005;

    if (fade>255) fadeAmount=-0.005; 

    fade += fadeAmount; 

    fill(0, 0, blue_shades[i], fade);

    star(0, 0, ((10*spin + 70) - 10 *i)/2.333, ((10*spin + 70) - 10*i), 4);

  }

}

​

function CrystalCoord(num) {

  for(let i = 0; i<num; i++) {

    coordinates[i] = random(0, width);

    coordinates[i+1] = random(0, height);

    fractalNum[i] = random(0, 10);

  }

}