// http://codingtra.in

// http://patreon.com/codingtrain

​

// Snowfall

// Edited Video: https://youtu.be/cl-mHFCGzYk

​

function getRandomSize() {

​

  let r = pow(random(0, 1), 3);

  return constrain(r * 32, 2, 32);

​

​

  // let r = randomGaussian() * 2.5;

  // return constrain(abs(r * r), 2, 36);

  // while (true) {

  //   let r1 = random(1);

  //   let r2 = random(1);

  //   if (r2 > r1) {

  //     return r1 * 36;

  //   }

  // }

}

​

​

class Snowflake {

​

  constructor(sx, sy, img) {

    let x = sx || random(width);

    let y = sy || random(-100, -10);

    this.img = img;

    this.pos = createVector(x, y);

    this.vel = createVector(0, 0);

    this.acc = createVector();

    this.angle = random(TWO_PI);

    this.dir = (random(1) > 0.5) ? 1 : -1;

    this.xOff = 0;

    this.r = getRandomSize();

  }

​

​

​

  applyForce(force) {

    // Parallax Effect hack

    let f = force.copy();

    f.mult(this.r);

​

    // let f = force.copy();

    // f.div(this.mass);

    this.acc.add(f);

  }

​

  randomize() {

    let x = random(width);

    let y = random(-100, -10);

    this.pos = createVector(x, y);

    this.vel = createVector(0, 0);

    this.acc = createVector();

    this.r = getRandomSize();

  }

​

  update() {

​

    this.xOff = sin(this.angle * 2) * 2 * this.r;

​

    this.vel.add(this.acc);

    this.vel.limit(this.r * 0.2);

​

    if (this.vel.mag() < 1) {

      this.vel.normalize();

    }

​

    this.pos.add(this.vel);

    this.acc.mult(0);

​

    if (this.pos.y > height + this.r) {

      this.randomize();

    }

​

    // Wrapping Left and Right

    if (this.pos.x < -this.r) {

      this.pos.x = width + this.r;

    }

    if (this.pos.x > width + this.r) {

      this.pos.x = -this.r;

    }

​

    this.angle += this.dir * this.vel.mag() / 200;

​

  }

​

  render() {

    // stroke(255);

    // strokeWeight(this.r);

    // point(this.pos.x, this.pos.y);

    push();

    translate(this.pos.x + this.xOff, this.pos.y);

    rotate(this.angle);

    imageMode(CENTER);

    image(this.img, 0, 0, this.r, this.r);

    pop();

​

​

  }

​

  // offScreen() {

  //   return (this.pos.y > height + this.r);

  // }

​

​

​

}

​