​

let clouds = [];

let goose;

let jellos = [];

let powerUp;

​

let score = 0;

let jelloInterval = 30;

​

let gooseImg;

let bg;

let star;

let titleImg;

let gameOverImg;

​

let gameStarted = false;

let gameOver = false;

​

function preload() {

  gooseImg = loadImage('goose.png');

  bg = loadImage('ct-background.png');

  star = loadImage('ct-star.png');

  titleImg = loadImage('title.png');

  gameOverImg = loadImage('game-over.png');

}

​

function setup() {

  createCanvas(windowWidth, windowHeight);

​

  SCROLL_SPEED = width / 120;

​

  for (let i = 0; i < 12; i++) {

    clouds.push(new Cloud());

  }

  goose = new Goose(width / 2, height / 2, gooseImg);

  powerUp = new PowerUp(star);

}

​

function draw() {

  if (gameOver) {

    image(gameOverImg, 0, 0, width, height);

    noLoop();

  } else {

​

    image(bg, 0, 0, width, height);

​

    for (let cloud of clouds) {

      cloud.update();

      cloud.show();

    }

​

    if (gameStarted) {

​

      powerUp.update();

      if (powerUp.collected(goose)) {

        goose.applyForce(createVector(20, 0));

        powerUp.pos.x = -100;

      }

      powerUp.show();

​

      for (let jello of jellos) {

        jello.update();

        if (jello.contains(goose.pos, goose.r * 0.5)) {

          goose.fakeDrag(jello.density);

        }

      }

​

      controlGoose();

​

      // universal drag

      goose.drag(0.1);

​

      goose.update();

​

    }

    goose.show();

    if (gameStarted) {

​

      // so goose shows up below jellos

      for (let jello of jellos) {

        jello.show();

      }

​

      if (goose.pos.x <= -goose.r) {

        gameOver = true;

      }

​

      if (frameCount % jelloInterval == 0) {

        addJello();

      }

​

      if (frameCount % 200 == 0) {

        powerUp.reset();

      }

      // display score

      fill(0);

      text(`SCORE: ${score}`, 10, 20);

    } else {

      image(titleImg, 0, 0, width, height);

    }

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

      if (jellos[i].pos.x < -100) {

        jellos.splice(i, 1);

        score++;

        if (score % 10 === 0) {

          jelloInterval--;

          if (jelloInterval < 10) {

            jelloInterval = 10;

          }

        }

      }

    }

  }

}

​

function controlGoose() {

  if (keyIsDown(UP_ARROW)) {

    goose.applyForce(createVector(0, -5));

  }

  if (keyIsDown(DOWN_ARROW)) {

    goose.applyForce(createVector(0, 5));

  }

}

​

function keyPressed() {

  gameStarted = true;

}

​

function addJello() {

  jellos.push(new Jello(width + 100, random(height), random(width / 20, width / 10), random(0.1, 0.3)));

}