let apple;

let intersecting;

let gameOver = false,

  paused = false,

  newHS = false;

let score = 0,

  highscore = 0;

let EASY = 0,

  MEDIUM = 1,

  HARD = 2;

let mode = HARD;

let size = 5;

​

function setup() {

  createCanvas(400, 400);

  if (mode == HARD) {

    size = 3;

  }

  snake = new Snake(width / 2, height / 2);

  apple = createVector(random(20, width - 20), random(20, height - 20));

}

​

function draw() {

  background(96, 175, 56);

  push();

  textAlign(LEFT, TOP);

  textSize(20);

  text("Score: " + score, 10, 10);

  pop();

  if (!gameOver) {

    intersecting = circlesIntersect(snake.pos, size, apple, size);

    if (!paused) {

      snake.update();

    }

    snake.show();

​

    if (intersecting) {

      changeApplePos();

    }

    push();

    ellipseMode(CENTER);

    noStroke();

    fill(255, 0, 0);

    circle(apple.x, apple.y, size * 2);

    pop();

  }

  if (score > highscore) {

    highscore = score;

    newHS = true;

  }

  if (paused) {

    push();

    rectMode(CORNER);

    noFill();

    stroke(0);

    strokeWeight(3);

    rect(5, 5, 30, 30);

    line(15, 12.5, 15, 27.5);

    line(25, 12.5, 25, 27.5);

    pop();

  }

  snake.checkGameOver();

}

​

function changeApplePos() {

  apple = createVector(random(20, width - 20), random(20, height - 20));

  for (let p of snake.prevPos) {

    if (circlesIntersect(apple, size, p, size)) {

      changeApplePos();

    }

  }

}

​

function keyPressed() {

  if ((key == "r" || key == "R") && gameOver) {

    gameOver = false;

    paused = false;

    newHS = false;

    snake.pos = createVector(width / 2, height / 2);

    snake.angle = 0;

    snake.prevPos = [];

    snake.len = 15;

    score = 0;

  }

  if ((key == "p" || key == "P") & !gameOver) {

    paused = !paused;

  }

}

​

function circlesIntersect(c1, r1, c2, r2) {

  let dist = p5.Vector.dist(c1, c2);

  if (dist < r1 + r2) {

    return true;

  }

  return false;

}

​

function GameOver() {

  background(96, 175, 56);

  gameOver = true;

  fill(0);

  noStroke();

  textSize(50);

  textAlign(CENTER);

  text("GAME OVER", width / 2, height / 2);

  textSize(25);

  text("Score: " + score, width / 2, 2 * height / 3);

  text("Highscore: " + highscore, width / 2, 3 * height / 4);

  if (newHS) {

    text("NEW HIGHSCORE!", width / 2, 5 * width / 6);

  }

​

​

  // noLoop();

}