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Кузнецов Аркадий, Садыров Влад. Выполнены задания с 1 по 3 #4

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Кузнецов Аркадий, Садыров Влад. Выполнены задания с 1 по 3 #4

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53 changes: 43 additions & 10 deletions script.js
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Original file line number Diff line number Diff line change
Expand Up @@ -19,20 +19,54 @@ var snakeGame = (function () {
let dx = 1;
let dy = 0;
let currentStep = 1;
let foodCounter = 0;

let playStep = () => {
headX += dx;
headY += dy;

let playStep = (direction) => {
dx = (direction - 38) % 2;
dy = (direction - 39) % 2;
headX = (WIDTH - 1) * (WIDTH - (headX + dx)) % WIDTH;
headY = (HEIGHT - 1) * (HEIGHT - (headY + dy)) % HEIGHT;
let newHeadCell = getCell(headX, headY);
let newFoodCell = getCell(Math.ceil(Math.random() * WIDTH), Math.ceil(Math.random() * HEIGHT));

removeSnakeCells();
removeSnakeCells();
addSnakeToCell(newHeadCell);
removeFoodCells();
addFoodToCell(newFoodCell);
setCellStep(newHeadCell, currentStep);

currentStep++;
return true;
}

let removeFoodCells = () => {
for (let foodCell of document.getElementsByClassName('food snake')) {
removeFoodFromCell(foodCell);
foodCounter--;
}
}

let getCellClass = (cell) => {
return cell.className;
}

let removeFoodFromCell = cell => {
cell.className = cell.className.replace('food', '');
}

let getFoodCells = () => {
// Можно находить элементы DOM по классу
return document.getElementsByClassName('food');
}

let addFoodToCell = cell => {
if (foodCounter == 0 && cell.className == '') {
cell.className += ' food';
foodCounter++;
}
}

let removeSnakeCells = () => {
for (let snakeCell of getSnakeCells())
removeSnakeFromCell(snakeCell);
Expand Down Expand Up @@ -63,7 +97,7 @@ var snakeGame = (function () {
cell.setAttribute('data-step', step);
}

let getCellStep = cell => {
let getCellStep = cell => {
// Явное преобразование строки к числу через объект-обертку.
return new Number(cell.getAttribute('data-step'));
}
Expand All @@ -77,18 +111,17 @@ var snakeGame = (function () {

// Главный цикл игры.
let timer = setInterval(function () {
if (!snakeGame.playStep())
{
if (!snakeGame.playStep(direction)) {
// Игра закончена - останавливаем цикл.
clearInterval(timer);
alert('Game Over! Score: ' + snakeGame.getScore());
}
}, 500);

var direction = 39;
// Обработка действий пользователя.
document.onkeydown = e => {
switch (e.keyCode)
{
// http://keycode.info/
if (e.keyCode < 41 && e.keyCode > 36) {
direction = e.keyCode;
}
}