let amplitudeMin = 10;

let amplitudeMax = 200;

let period;

let periodMin = 40;

let periodMax = 300;

let shiftX;

let shiftY;

let dotRadiusMin = 1;

let dotRadiusMax = 1;

let powerBase = 1.02;

let x = 0;

let y = 0;

let done = false;

​

function setup()

{

  createCanvas(400, 400);

  fill(40);

  Begin();

}

​

function keyPressed()

{

  if (keyCode === 32)

    Begin();

}

​

function draw()

{

  if (done === true)

    return;

  for (y = 0; y < height; ++y)

  {

    let sine = amplitude * sin((x + shiftX) * TAU / period) + shiftY;

    let distance = abs(y - sine);

    let alpha = pow(powerBase, -distance);

    stroke(alpha * 250, alpha * 180, alpha * 50);

    strokeWeight( (dotRadiusMax - dotRadiusMin) * pow(Math.random(), 3) + dotRadiusMin);

​

    point(x, y);

  }

  ++x;

  if (x >= width)

  {

    done = true;

  }

}

​

function Begin()

{

  blendMode(BLEND);

  background(40);

  blendMode(ADD);

  amplitude = (amplitudeMax - amplitudeMin) * Math.random() + amplitudeMin;

  period = (periodMax - periodMin) * Math.random() + periodMin;

  shiftX = Math.random() * period;

  shiftY = Math.random() * height;

  x = 0;

  y = 0;

  done = false;

}

​