const ground = [];

​

const minSpeed = 1;

const maxSpeed = 5;

​

function setup() {

  createCanvas(500, 500);

  noSmooth();

  stroke(255);

  fill(255);

  for(let i = 0; i < 100; i++){

    snowflakes.push(createVector(

      random(width), random(height),

      random(minSpeed, maxSpeed)));

  }

  for(let x = 0; x < width; x++) {

    ground[x] = height;

  }

}

​

function draw() {

  background(0, 0, 32);

  for(const snowflake of snowflakes) {

    snowflake.y += snowflake.z;

​

    rect(snowflake.x, snowflake.y, 1, 1);

    if(snowflake.y >= ground[floor(snowflake.x)]) {

      ground[floor(snowflake.x)]--;

      snowflake.x = random(width);

      snowflake.y = 0;

    }

  }

  for(let x = 0; x < width; x++) {

    rect(x, ground[x], 1, height - ground[x]);

  } 

}

​

function mousePressed() {

  snowflakes.push(createVector(mouseX, mouseY,

                               random(minSpeed, maxSpeed)));

}

​

function mouseDragged() {

  snowflakes.push(createVector(mouseX, mouseY,

                               random(minSpeed, maxSpeed)));

}