rows,

    gridScale,

    grid,

    snake,

    food;

​

function setup() {

  columns = 20;

  rows = 20;

  gridScale = 20;

  grid = new Grid(columns, rows, gridScale);

  snake = new Snake(grid, 0, 0, 50);

  food = new Food(grid, 0, 0, "#C36");

  food.randomPosition(snake.getBody());

  createCanvas(columns * gridScale, rows * gridScale);

  frameRate(10);

}

​

function draw() {

  background(22);

  food.show();

  snake.move();

  if (snake.selfCollide()) {

    createP("Game over!").style("color", "#EEE").style("font-family", "Montserrat");

    noLoop();

  }

  if (snake.eats(food)) {

    snake.grow();

    food.randomPosition(snake.getBody());

  }

  snake.show();

}

​

function keyPressed() {

  switch (key) {

    case "ArrowUp":

      snake.setSpeed(0, -1);

      break;

    case "ArrowDown":

      snake.setSpeed(0, 1);

      break;

    case "ArrowLeft":

      snake.setSpeed(-1, 0);

      break;

    case "ArrowRight":

      snake.setSpeed(1, 0);

      break;

  }

}

​

function sign(number) {

  if (number)

    return number / abs(number);

  return 0;

}

​