ArrayList points;
float t = 0;
float dt = 0.03;

void setup() {
  size(400, 400);
  colorMode(HSB, 2 * PI, 1, 1, 1);
  smooth();
  
  noStroke();
}

void draw() {
  clear();
  fill(120, 0, 1, 0.3);
  
  randomSeed(4127);
  
  for (int i = 0; i < 1800; i++) {
    particle(t);
  }
  
  t += dt;
}

void clear() {
  //background(0, 0, 0);
  fill(0, 0, 0, 0.05);
  rect(0, 0, width, height);
}

void particle(float t) {
  float x = random(-1, 1);
  float y = random(-1, 1);
  float d = 0;
  
  float xx = map(x*cos(y*t - cos(t*x)), -1, 1, 0, width);
  float yy = map(y*cos(x*t - cos(t*y)), -1, 1, 0, height);
  d = 0.5 + 3 * x*cos(y*t);
    
  ellipse(xx, yy, d, d);
}

void mousePressed() {
  t = 0;
}