Rudolph - OpenProcessing

mySketch
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    int numFlakes = 8192;
    float flakeSpeed = 2;
    float minSpeed = 0.5;
    float flakeRange = 1;
    Flake[] flakes = new Flake[numFlakes];
    
    void setup() {
      size(640, 480);
      smooth();
      noStroke();
      for (int i = 0; i < numFlakes; i++) {
        flakes[i] = new Flake(new PVector(random(width), random(height)), new PVector(random(-flakeRange, flakeRange), random(1, flakeRange*2)), random(8));
      }
    }
    
    void draw() {
      background(13, 26, 129);
      for (int i = 0; i < numFlakes; i++) {
        flakes[i].run();
        flakes[i].display();
      }
      fill(255, 0, 0);
      ellipse(-8, height/2+(8*sin(frameCount/3.0)), 32, 32);
    }
    
    class Flake {
      float flakeSize;
      PVector position, direction;
      Flake(PVector position_, PVector direction_, float flakeSize_) {
        position = position_;
        direction = direction_;
        flakeSize = flakeSize_;
      }
    
      void run() {
        position.add(direction);
        if (position.y > height) {
          position = new PVector(random(width), 0);
          direction = new PVector(random(-flakeRange, flakeRange), random(1, flakeRange*2));
          flakeSize  = random(8);
        }
      }
    
      void display() {
        float offset = 8*sin(frameCount/3.0);
        fill(0, 64);
    
        if ((position.y < position.x/3 + height/2 + offset) && (position.y > -position.x/3 + height/2 + offset ) ) {
          fill(255, 0, 0);
        }
    
        ellipse(position.x, position.y, flakeSize, flakeSize);
      }
    }