snake-game

// title:  game title
// author: game developer
// desc:   short description
// script: js
var dirs = [{
  x: 0,
  y: -1
}, {
  x: 0,
  y: 1
}, {
  x: -1,
  y: 0
}, {
  x: 1,
  y: 0
}];
var SCREEN_WIDTH = 30;
var SCREEN_HEIGHT = 17;
var BLOCK_SIZE = 8;
var state = {
  snake: [{
    x: 15,
    y: 8
  }, {
    x: 14,
    y: 8
  }, {
    x: 13,
    y: 8
  }],
  t: 0,
  score: 0,
  food: {
    x: 0,
    y: 0
  },
  dir: dirs[0]
};

function pointsEqual(p, q) {
  return p.x === q.x && p.y === q.y;
}

function draw(_ref) {
  var snake = _ref.snake,
      food = _ref.food;
  cls(1);
  snake.forEach(function (v) {
    return rect(v.x * BLOCK_SIZE, v.y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE, 15);
  });
  rect(food.x * BLOCK_SIZE, food.y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE, 6);
}

function update(_ref2, onUpdate) {
  var t = _ref2.t;

  if (t % 5 == 0) {
    onUpdate();
  }
}

function getDir(lastDir) {
  for (var i = 0; i < 4; i++) {
    if (btn(i)) {
      return dirs[i];
    }
  }

  return lastDir;
}

function gotFood(_ref3) {
  var head = _ref3.head,
      food = _ref3.food;
  return pointsEqual(head, food);
}

function setFood(_ref4) {
  var food = _ref4.food,
      snake = _ref4.snake;
  food.x = Math.ceil(Math.random() * SCREEN_WIDTH - 1);
  food.y = Math.ceil(Math.random() * SCREEN_HEIGHT - 1);

  if (snake.filter(function (v) {
    return pointsEqual(v, food);
  }).length) {
    setFood({
      food: food,
      snake: snake
    });
  }
}

function isDead(_ref5, onDead) {
  var snake = _ref5.snake,
      head = _ref5.head;

  for (var i = 0; i < snake.length - 1; i++) {
    var v = snake[i];

    if (pointsEqual(head, v)) {
      return onDead();
    }
  }
}

setFood(state);

function TIC() {
  state.t += 1;
  state.tail = state.snake[0];
  state.neck = state.snake[state.snake.length - 2];
  state.head = state.snake[state.snake.length - 1];
  update(state, function () {
    isDead(state, function () {
      trace("Game OVER!");
      trace("Score: " + state.score);
      exit();
    });
    state.snake.push({
      x: (state.head.x + state.dir.x) % SCREEN_WIDTH,
      y: (state.head.y + state.dir.y) % SCREEN_HEIGHT
    });
    state.snake.forEach(function (v) {
      v.x = v.x >= 0 ? v.x : SCREEN_WIDTH;
      v.y = v.y >= 0 ? v.y : SCREEN_HEIGHT;
    });

    if (!gotFood(state)) {
      state.snake.shift();
    } else {
      setFood(state);
      state.score += 1;
    }
  });
  var lastDir = state.dir;
  state.dir = getDir(lastDir);

  if (state.head.x + state.dir.x === state.neck.x && state.head.y + state.dir.y === state.neck.y) {
    state.dir = lastDir;
  }

  draw(state);
}

// title:  game title
// author: game developer
// desc:   short description
// script: js
var dirs = [{
  x: 0,
  y: -1
}, {
  x: 0,
  y: 1
}, {
  x: -1,
  y: 0
}, {
  x: 1,
  y: 0
}];
var SCREEN_WIDTH = 30;
var SCREEN_HEIGHT = 17;
var BLOCK_SIZE = 8;
var state = {
  snake: [{
    x: 15,
    y: 8
  }, {
    x: 14,
    y: 8
  }, {
    x: 13,
    y: 8
  }],
  t: 0,
  score: 0,
  food: {
    x: 0,
    y: 0
  },
  dir: dirs[0]
};

function pointsEqual(p, q) {
  return p.x === q.x && p.y === q.y;
}

function draw(_ref) {
  var snake = _ref.snake,
      food = _ref.food;
  cls(1);
  snake.forEach(function (v) {
    return rect(v.x * BLOCK_SIZE, v.y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE, 15);
  });
  rect(food.x * BLOCK_SIZE, food.y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE, 6);
}

function update(_ref2, onUpdate) {
  var t = _ref2.t;

  if (t % 5 == 0) {
    onUpdate();
  }
}

function getDir(lastDir) {
  for (var i = 0; i < 4; i++) {
    if (btn(i)) {
      return dirs[i];
    }
  }

  return lastDir;
}

function gotFood(_ref3) {
  var head = _ref3.head,
      food = _ref3.food;
  return pointsEqual(head, food);
}

function setFood(_ref4) {
  var food = _ref4.food,
      snake = _ref4.snake;
  food.x = Math.ceil(Math.random() * SCREEN_WIDTH - 1);
  food.y = Math.ceil(Math.random() * SCREEN_HEIGHT - 1);

  if (snake.filter(function (v) {
    return pointsEqual(v, food);
  }).length) {
    setFood({
      food: food,
      snake: snake
    });
  }
}

function isDead(_ref5, onDead) {
  var snake = _ref5.snake,
      head = _ref5.head;

  for (var i = 0; i < snake.length - 1; i++) {
    var v = snake[i];

    if (pointsEqual(head, v)) {
      return onDead();
    }
  }
}

setFood(state);

function TIC() {
  state.t += 1;
  state.tail = state.snake[0];
  state.neck = state.snake[state.snake.length - 2];
  state.head = state.snake[state.snake.length - 1];
  update(state, function () {
    isDead(state, function () {
      trace("Game OVER!");
      trace("Score: " + state.score);
      exit();
    });
    state.snake.push({
      x: (state.head.x + state.dir.x) % SCREEN_WIDTH,
      y: (state.head.y + state.dir.y) % SCREEN_HEIGHT
    });
    state.snake.forEach(function (v) {
      v.x = v.x >= 0 ? v.x : SCREEN_WIDTH;
      v.y = v.y >= 0 ? v.y : SCREEN_HEIGHT;
    });

    if (!gotFood(state)) {
      state.snake.shift();
    } else {
      setFood(state);
      state.score += 1;
    }
  });
  var lastDir = state.dir;
  state.dir = getDir(lastDir);

  if (state.head.x + state.dir.x === state.neck.x && state.head.y + state.dir.y === state.neck.y) {
    state.dir = lastDir;
  }

  draw(state);
}