int width = 300;
int height = 300;
int frame = 0;
int flakeCount = 0;
int maxflakes = 1024;
Flake[] flakes = new Flake[maxflakes];

void setup() {
  noStroke();
  size(width, height);
  framerate(10);
}

void draw() {
  background(0);
  
  if (frame++ % 8 == 0) {
    addFlake();
  }
  
  for (int i = 0; i < flakeCount; ++i) {
    flakes[i].draw();
    flakes[i].x += 1;
  }
  
  ++frame;
}

void addFlake() {
  if (flakeCount < (maxflakes - 1)) {
    Flake flake = new Flake();
    flakes[flakeCount++] = flake;
  }
}

class Flake {
  float x;
  float y;
  float direction, speed;
  int age;
  float wobble;
  float size;
  
  public Flake() {
    x = random(width);
    y = 0;
    direction = 0;
    age = 0;
    speed = 1 + random(3);
    wobble = 1 + random(3);
    size = 5 + random(5);
  }
  
  public void move() {
    float hyp = speed;
    float opp = sin(direction) * hyp;
    float adj = cos(direction) * hyp;
    float newx = x + opp;
    float newy = y + adj;
  
    x = newx;
    y = newy;
  }
  
  public void draw() {
    float foo = 2 * sin((PI / 4) * age++);
    float x1 = x + sin(direction + PI / wobble) * foo;
    float y1 = y + cos(direction + PI / wobble) * foo;
    fill((size / 10) * 128 + 127);
    ellipse(x1, y1, size, size);
    move();
  }
}