Stardust - OpenProcessing

mySketch
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//Stardust by Konstantin Makhmutov
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var particlesQuantity = 18000;
​
var positionX = new Array(particlesQuantity);
var positionY = new Array(particlesQuantity);
var velocityX = new Array(particlesQuantity).fill(0);
var velocityY = new Array(particlesQuantity).fill(0);
​
function setup() {
  createCanvas(windowWidth-100, windowHeight-100);
  strokeWeight(3);
  stroke(64, 255, 255);
  
  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() {
  background(0);
  
  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 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];
    }
    
    point(positionX[particle], positionY[particle]);
  }
}
​
function mousePressed() {
  for (var particle = 1; particle < particlesQuantity; particle++) {
    positionX[particle] = random(0, width);
    positionY[particle] = random(0, height);
  }
}