let windowScale;

let rsize;

​

function setup() {

  createCanvas(3000, 3000);

  angleMode(RADIANS);

  stroke(color(20, 20, 20, 5));

​

  noFill();

  background(220);

  windowScale = width / 1000;

  rsize = 5 * windowScale;

  particles = [];

  for (let _ = 0; _ < 500 * windowScale; _++) {

    particles.push({

      x: random(width),

      y: -rsize,

      life: random(height, height / 2),

      vx: 0,

    });

  }

  rectMode(CENTER);

}

​

function draw() {

  // for (let p of particles) {

  for (let i = particles.length - 1; i >= 0; i--) {

    let p = particles[i];

    rect(p.x, p.y, 5 * windowScale, 5 * windowScale);

    p.y++;

    p.x += p.vx;

    if (random() > 0.98) {

      p.vx = random([-1, 1, 0]);

    }

​

    if (p.x < 0 || p.x > width || p.y > height) {

      // p.x = random(width);

      // p.y = 0;

      particles.splice(i, 1);

    }

  }

​

  // if (frameCount > 2000) {

  if (particles.length == 0) {

    console.log("done");

    noLoop();

  }

}

​