let u

​

function setup() {

  l = min(windowWidth, windowHeight)

  createCanvas(w = l, h = l);

  u = l / 64

  noLoop()

}

​

function draw() {

  background(27);

  drawGrid()

  emerge(w / 2, h / 2, 0, TAU, 0.2)

}

​

function drawGrid() {

  noFill()

  stroke(255, 10)

  for (let j = 0; j < grid; j++) {

    for (let i = 0; i < grid; i++) {

      rect(i * u, j * u, u, u)

    }

  }

}

​

function emerge(x, y, lowerBound, upperBound, randomOff) {

  strokeWeight(5)

  point(x, y)

  let delta = upperBound - lowerBound

  let phi = delta / 16

  for (let i = 0; i < 16; i++) {

    let theta = i * delta + random([-1, 1]) * random(phi * randomOff)

    let cx, cy

    do {

      let a = random(l * 0.75)

      cx = a * cos(theta)

      cy = a * sin(theta)

    } while (cx >= 0 && cx < w && cy >= 0 && cy < h)

    line(x, y, cx, cy)

  }

}

​

​

​

​

​

​

​