let snowFlakes = [];

​

function setup() {

  createCanvas(800, 400);

  for (let i=0;i<50;i++) snowFlakes[i] = new flake(i);

}

​

function draw() {

  background(220);

  fill(0);

  //rect(100,100,100,100);

      noStroke();

    fill(255,200);

  for (let i=0;i<snowFlakes.length;i++) snowFlakes[i].draw();

}

​

function mouseClicked() {

//  window.open("https://www.twitter.com");

}

​

class flake {

  constructor(index) {

    this.index=index;

    this.x=random(width);

    this.y=-random(height);

    this.size = 5+random(5);

  }

  draw() {

    this.y=((this.y+this.size/5)%height);

    if (this.y<1) this.x=random(width);

    circle(this.x+30*noise(this.index+frameCount/100),this.y,this.size);

  } 

}