let time = 0;

​

function setup() {

  createCanvas(2*half_w, 2*half_h);

  background("darkred");

  stroke("white");

  strokeWeight(1/zoom);

}

​

​

function disk1() {

  let angle = random(TWO_PI);

  let r = random() + random();

  if(r > 1) r = 2 - r;

  let x = r*cos(angle);

  let y = r*sin(angle);

  point(x, y);

}

​

function disk2() {

  let x = 1, y = 1;

  while(x*x + y*y > 1) {

    x = random() * 2 - 1;

    y = random() * 2 - 1;

  }

  point(x, y);

}

​

function disk3() {

  let a = random();

  let b = (12345*a) % 0.5;

  let c = (34567*a & 2) - 1;

  let d = (76543*a & 2) - 1;

  let x = c * sqrt(a) * (5 / (1 + b*b) - 4);

  let y = d * sqrt(a - x*x);

  point(x, y);

}

​

function disk4() {

  let r = random() + random();

  if(r > 1) r = 2 - r;

  let n = 10;

  let t = 0;

  let u = random() * sqrt(10/(n*n - 6));

  while(n-- > 0) {

    t = (u + t) / (1 - u*t);      

  }

  let x = r * (1 - t*t) / (1 + t*t);

  let y = r * (2*t) / (1 + t*t);

  point(x, y);

}

​

function disk5() {

  let k = random();

  let r = k + (1000*k) % 1; 

  if(r > 1) r = 2 - r;

  let x = r * cos(2*PI*k);

  let y = r * sin(2*PI*k);

  point(x, y);

}

​

function disk6() {

  let x = random();

  let y = random();

  if(x > y) {

    [x, y] = [y, x];

  }

  let ang = x/y * 2*PI;

  let r  = y;

  x = r * cos(ang);

  y = r * sin(ang);

  point(x, y);

}

​

function disk7() {

  // The randoms

  let a = random();

  let b = random();

  let t = random() / 2;

  // Radius

  let r = a + b;

  if(r > 1) r = 2 - r;

  // Start in a random quadrant

  let x = (a + b) > 1 ? -r : r;

  let y = (a - b) < 0 ? -r : r;

  // cos, sin approx

  x *= 5 / (1 + t*t) - 4;

  t -= 0.5;

  y *= 5 / (1 + t*t) - 4;

  point(x, y);

}

​

​

function draw() {

  applyMatrix(zoom, 0, 0, -zoom, half_w, half_h);

  disk7();

  if(frameCount > 50000) noLoop();

}

​

​