let amplitudeMin = 10;

let amplitudeMax = 200;

let period;

let periodMin = 40;

let periodMax = 300;

let shiftX;

let shiftY;

let dotRadiusMin = 2.5;

let dotRadiusMax = 7.5;

let powerBase = 1.6;

let allDots;

​

function setup()

{

  createCanvas(400, 400);

  fill(40);

  Begin();

}

​

function keyPressed()

{

  if (keyCode === 32)

    Begin();

}

​

function draw()

{

  if (allDots == undefined)

    return;

  if (mouseX >= width || mouseY >= height)

    return;

  if (allDots[mouseX][mouseY] === true)

    return;

  allDots[mouseX][mouseY] = true;

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

  let distance = abs(mouseY - sine);

  let alpha = pow(powerBase, -distance);

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

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

  point(mouseX, mouseY);

}

​

function Begin()

{

  blendMode(BLEND);

  background(40);

  blendMode(ADD);

  allDots = [];

  for (let i = 0; i < width; ++i)

  {

    allDots[i] = [];

    for (let j = 0; j < height; ++j)

    {

      allDots[i][j] = false;

    }

  }

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

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

  shiftX = Math.random() * period;

  shiftY = Math.random() * height;

}

​