Four seasons in Fuji Mt. - OpenProcessing

mySketch
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let circleSun;
let velocity;
let tempX;
let tempY;
let img;
let img2;
let img3;
let snowflakes = [];
​
function preload() {
  img = loadImage("Autumn.png");
  img2 = loadImage("Spring.png");
  img3 = loadImage("Summer.png");
}
​
function setup() {
  createCanvas(400, 400);
  background(204, 206, 236);
  noStroke();
  circleSunX = 240;
  circleSunY = 170;
  circleX = 240;
  circleY = 470;
  circleSunR = 70;
  circleR = circleY - circleSunY;
  position = createVector(250, 30);
  velocity = createVector(3, 7);
​
  image(img, 0, 0);
  slider = createSlider(1, 4, 0, 1);
  slider.position(width / 2, height + 30);
}
​
function draw() {
  if (circleSunY < height) {
    background(204, 206, 236);
  } else {
    background(0);
  }
​
  fill(255, 67, 67);
  circle(circleSunX, circleSunY, circleSunR);
  tempX = circleSunX - circleX;
  tempY = circleSunY - circleY;
  circleSunX = circleR * cos(atan2(tempY, tempX) + PI / 180) + circleX;
  circleSunY = circleR * sin(atan2(tempY, tempX) + PI / 180) + circleY;
​
  fill(63, 109, 195);
  quad(180, 180, 220, 180, 400, 400, 0, 400);
​
  fill(255, 255, 255);
  quad(180, 180, 220, 180, 260, 230, 140, 230);
​
  let t = frameCount / 60; // update time
  // create a random number of snowflakes each frame
  for (var i = 0; i < random(5); i++) {
    snowflakes.push(new snowflake()); // append snowflake object
  }
 if (mouseIsPressed){
  snowflakes = [];}
​
  // loop through snowflakes with a for..of loop
​
  if (slider.value() == 1) {
    for (let flake of snowflakes) {
      flake.update(t); // update snowflake position
      flake.display(); // draw snowflake
    }
  } else if (slider.value() == 2) {
    for (let flake of snowflakes) {
      flake.update(t); // update snowflake position
      flake.display2(); // draw snowflake
    }
  } else if (slider.value() == 3) {
    for (let flake of snowflakes) {
      flake.update(t); // update snowflake position
      flake.display3(); // draw snowflake
    }
  } else if (slider.value() == 4) {
    for (let flake of snowflakes) {
      flake.update(t); // update snowflake position
      flake.display4(); // draw snowflake
    }
  }
}
​
class snowflake {
  constructor() {
    this.posX = 0;
    this.posY = random(-50, 0);
    this.initialangle = random(0, 2 * PI);
    this.size = random(5, 15);
​
    // radius of snowflake spiral
    // chosen so the snowflakes are uniformly spread out in area
    this.radius = sqrt(random(pow(width / 2, 2)));
  }
​
  update(time) {
    // x position follows a circle
    let w = 0.6; // angular speed
    let angle = w * time + this.initialangle;
    this.posX = width / 2 + this.radius * sin(angle);
    // different size snowflakes fall at slightly different y speeds
    this.posY += pow(this.size, 0.5);
    // delete snowflake if past end of screen
    if (this.posY > height) {
      let index = snowflakes.indexOf(this);
      snowflakes.splice(index, 1);
    }
  }
​
  display() {
    image(img2, this.posX, this.posY, this.size, this.size);
  }
​
  display3() {
    image(img, this.posX, this.posY, this.size, this.size);
  }
   display2() {
    image(img3, this.posX, this.posY, this.size*1.5, this.size*1.5);
  }
  
     display4() {
     ellipse(this.posX, this.posY, this.size/2);
  }
}
​