​

var positionX = new Array(particlesQuantity);

var positionY = new Array(particlesQuantity);

var velocityX = new Array(particlesQuantity).fill(0);

var velocityY = new Array(particlesQuantity).fill(0);

​

let sizeSlider, quantitySlider;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  strokeWeight(2);

  sizeSlider = createSlider(1, 10, 3);

  quantitySlider = createSlider(1000, 20000, 18000);

  sizeSlider.position(20, height - 40);

  quantitySlider.position(20, height - 80);

​

  for (var particle = 1; particle < particlesQuantity; particle++) {

    positionX[particle] = random(0, width);

    positionY[particle] = random(0, height);

  }

​

  positionX[0] = 0;

  positionY[0] = 0;

}

​

function draw() {

  let dynamicTime = frameCount * 0.01; 

  let red = (sin(dynamicTime) + 1) * 80;

  let green = (cos(dynamicTime) + 1) * 80;

  background(red, green, 180);

​

  particlesQuantity = quantitySlider.value();

  let particleSize = sizeSlider.value();

​

  velocityX[0] = velocityX[0] * 0.5 + (mouseX - positionX[0]) * 0.1;

  velocityY[0] = velocityY[0] * 0.5 + (mouseY - positionY[0]) * 0.1;

  positionX[0] += velocityX[0];

  positionY[0] += velocityY[0];

​

  for (var particle = 1; particle < particlesQuantity; particle++) {

    var r = map(positionX[particle], 0, width, 50, 200);

    var g = map(positionY[particle], 0, height, 50, 200);

    var b = map(velocityX[particle], -5, 5, 50, 200);

    stroke(r, g, b);

​

    var whatever = 1024 / (sq(positionX[0] - positionX[particle]) + sq(positionY[0] - positionY[particle]));

    velocityX[particle] = velocityX[particle] * 0.95 + (velocityX[0] - velocityX[particle]) * whatever;

    velocityY[particle] = velocityY[particle] * 0.95 + (velocityY[0] - velocityY[particle]) * whatever;

    positionX[particle] += velocityX[particle];

    positionY[particle] += velocityY[particle];

​

    if ((positionX[particle] < 0 && velocityX[particle] < 0) || (positionX[particle] > width && velocityX[particle] > 0)) {

      velocityX[particle] = -velocityX[particle];

    }

​

    if ((positionY[particle] < 0 && velocityY[particle] < 0) || (positionY[particle] > height && velocityY[particle] > 0)) {

      velocityY[particle] = -velocityY[particle];

    }

​

    ellipse(positionX[particle], positionY[particle], particleSize, particleSize);

  }

}

​

function mousePressed() {

  for (var particle = 1; particle < particlesQuantity; particle++) {

    positionX[particle] = random(0, width);

    positionY[particle] = random(0, height);

  }

}