let food;

let scl = 20;

​

function setup() {

  createCanvas(400, 400);

  snake = new Snake(1, 1);

  newFood();

  frameRate(4);

}

​

function newFood() {

  food = createVector(floor(random(width / scl)), floor(random(height / scl)));

}

​

function keyPressed() {

  switch (keyCode) {

    case UP_ARROW:

      snake.setDir(0, -1);

      break;

    case RIGHT_ARROW:

      snake.setDir(1, 0);

      break;

    case DOWN_ARROW:

      snake.setDir(0, 1);

      break;

    case LEFT_ARROW:

      snake.setDir(-1, 0);

      break;

  }

}

​

function draw() {

  background(220);

  noStroke();

  fill(0);

  scale(scl);

  if (snake.died()) {

    background(255, 0, 0);

    noLoop();

    return;

  }

  snake.show();

  snake.update();

  snake.eat(food, newFood);

  fill(255, 0, 0);

  rect(food.x, food.y, 1, 1)

}