var y = 200;

var gameOver = false;

var direction = 40;

​

function setup() {

  createCanvas(400, 400);

  background(0, 0, 255);

  fill(0);

  rect(3, 3, 393, 393);

  textSize(40);

  textAlign(CENTER);

}

​

function draw() {

  if(gameOver === true)

    return;

  if (notBlack() === true) {

    fill(255);

    text("Game Over!", 200, 120);

    gameOver = true;

  }

  stroke(255);

  point(x, y);

  if(direction === 37)

    x = x - 1;

  if(direction === 38)

    y = y - 1;

  if(direction === 39)

    x = x + 1;

  if(direction === 40)

    y = y + 1;

}

function notBlack() {

  var a = get(x, y);

  if (a[0] !== 0) return true;

  else if (a[1] !== 0) return true;

  else if (a[2] !== 0) return true;

  return false;

}

function keyPressed(){

  if(keyCode >= 37 && keyCode<=40)

    direction = keyCode;

}

​

​