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app.js
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292 lines (260 loc) · 7.91 KB
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/**
* https://www.youtube.com/watch?v=rAUn1Lom6dw
*/
// TODO: Bug edge > rotate > tetromino is split off.
document.addEventListener("DOMContentLoaded", () => {
const grid = document.querySelector(".grid");
let squares = Array.from(document.querySelectorAll(".grid div"));
const scoreDisplay = document.querySelector("#score");
const startButton = document.querySelector("#start-button");
const width = 10;
let nextRandom = 0;
let timerId;
let score = 0;
const colors = ["orange", "red", "purple", "green", "blue"];
// The Tetrominoes
const lTetromino = [
[1, width + 1, width * 2 + 1, 2],
[width, width + 1, width + 2, width * 2 + 2],
[1, width + 1, width * 2 + 1, width * 2],
[width, width * 2, width * 2 + 1, width * 2 + 2],
];
const zTetromino = [
[0, width, width + 1, width * 2 + 1],
[width + 1, width + 2, width * 2, width * 2 + 1],
[0, width, width + 1, width * 2 + 1],
[width + 1, width + 2, width * 2, width * 2 + 1],
];
const tTetromino = [
[1, width, width + 1, width + 2],
[1, width + 1, width + 2, width * 2 + 1],
[width, width + 1, width + 2, width * 2 + 1],
[1, width, width + 1, width * 2 + 1],
];
const oTetromino = [
[0, 1, width, width + 1],
[0, 1, width, width + 1],
[0, 1, width, width + 1],
[0, 1, width, width + 1],
];
const iTetromino = [
[1, width + 1, width * 2 + 1, width * 3 + 1],
[width, width + 1, width + 2, width + 3],
[1, width + 1, width * 2 + 1, width * 3 + 1],
[width, width + 1, width + 2, width + 3],
];
const theTetrominoes = [
lTetromino,
zTetromino,
tTetromino,
oTetromino,
iTetromino,
];
let currentPosition = 4;
let currentRotation = 0;
// Randomly select a Tetromino and its first rotation.
let random = Math.floor(Math.random() * theTetrominoes.length);
let current = theTetrominoes[random][currentRotation];
// Draw the tetromino.
function draw() {
current.forEach((index) => {
squares[currentPosition + index].classList.add("tetromino");
squares[currentPosition + index].style.backgroundColor = colors[random];
});
}
// Undraw the tetromino.
function undraw() {
current.forEach((index) => {
squares[currentPosition + index].classList.remove("tetromino");
squares[currentPosition + index].style.backgroundColor = "";
});
}
// Assign functions to keyCodes.
function control(e) {
if (e.keyCode === 37) {
moveLeft();
} else if (e.keyCode === 38) {
rotate();
} else if (e.keyCode === 39) {
moveRight();
} else if (e.keyCode === 40) {
moveDown();
}
}
document.addEventListener("keyup", control);
function moveDown() {
undraw();
currentPosition += width;
draw();
freeze();
}
// Freeze function
function freeze() {
if (
current.some((index) =>
squares[currentPosition + index + width].classList.contains("taken")
)
) {
current.forEach((index) =>
squares[currentPosition + index].classList.add("taken")
);
// Start a new tetromino falling.
random = nextRandom;
nextRandom = Math.floor(Math.random() * theTetrominoes.length);
current = theTetrominoes[random][currentRotation];
currentPosition = 4;
draw();
displayShape();
addScore();
gameOver();
}
}
// Move the tetromino left, unless is at the edge or there is a blockage.
function moveLeft() {
undraw();
const isAtLeftEdge = current.some(
(index) => (currentPosition + index) % width === 0
);
if (!isAtLeftEdge) {
currentPosition -= 1;
}
if (
current.some((index) =>
squares[currentPosition + index].classList.contains("taken")
)
) {
currentPosition += 1;
}
draw();
}
// Move the tetromino right, unless is at the edge or there is a blockage.
function moveRight() {
undraw();
const isAtRightEdge = current.some(
(index) => (currentPosition + index) % width === width - 1
);
if (!isAtRightEdge) {
currentPosition += 1;
}
if (
current.some((index) =>
squares[currentPosition + index].classList.contains("taken")
)
) {
currentPosition -= 1;
}
draw();
}
///FIX ROTATION OF TETROMINOS A THE EDGE
function isAtRight() {
return current.some((index) => (currentPosition + index + 1) % width === 0);
}
function isAtLeft() {
return current.some((index) => (currentPosition + index) % width === 0);
}
function checkRotatedPosition(P) {
P = P || currentPosition; //get current position. Then, check if the piece is near the left side.
if ((P + 1) % width < 4) {
//add 1 because the position index can be 1 less than where the piece is (with how they are indexed).
if (isAtRight()) {
//use actual position to check if it's flipped over to right side
currentPosition += 1; //if so, add one to wrap it back around
checkRotatedPosition(P); //check again. Pass position from start, since long block might need to move more.
}
} else if (P % width > 5) {
if (isAtLeft()) {
currentPosition -= 1;
checkRotatedPosition(P);
}
}
}
// Rotate the tetromino.
function rotate() {
undraw();
currentRotation++;
// If the current rotation gets to 4, make it go back to 0.
if (currentRotation === current.length) {
currentRotation = 0;
}
current = theTetrominoes[random][currentRotation];
checkRotatedPosition();
draw();
}
// Show up-next tetromino in mini-grid display.
const displaySquares = document.querySelectorAll(".mini-grid div");
const displayWidth = 4;
const displayIndex = 0;
// The tetrominos without rotations.
const upNextTetrominoes = [
[1, displayWidth + 1, displayWidth * 2 + 1, 2], // lTetromino
[0, displayWidth, displayWidth + 1, displayWidth * 2 + 1], // zTetromino
[1, displayWidth, displayWidth + 1, displayWidth + 2], // tTetromino
[0, 1, displayWidth, displayWidth + 1], // oTetromino
[1, displayWidth + 1, displayWidth * 2 + 1, displayWidth * 3 + 1], // iTetromino
];
// Display the shape in the mini-grid display.
function displayShape() {
// Remove any trace of a tetramino from the entire grid.
displaySquares.forEach((square) => {
square.classList.remove("tetromino");
square.style.backgroundColor = "";
});
upNextTetrominoes[nextRandom].forEach((index) => {
displaySquares[displayIndex + index].classList.add("tetromino");
displaySquares[displayIndex + index].style.backgroundColor =
colors[nextRandom];
});
}
// Add functionality to the button.
startButton.addEventListener("click", () => {
if (timerId) {
clearInterval(timerId);
timerId = null;
} else {
draw();
timerId = setInterval(moveDown, 1000);
nextRandom = Math.floor(Math.random() * theTetrominoes.length);
displayShape();
}
});
// Add score.
function addScore() {
for (let i = 0; i < 199; i += width) {
const row = [
i,
i + 1,
i + 2,
i + 3,
i + 4,
i + 5,
i + 6,
i + 7,
i + 8,
i + 9,
];
if (row.every((index) => squares[index].classList.contains("taken"))) {
score += 10;
scoreDisplay.innerHTML = score;
row.forEach((index) => {
squares[index].classList.remove("taken");
squares[index].classList.remove("tetromino");
squares[index].classList.style.backgroundColor = "";
});
const squaresRemoved = squares.splice(i, width);
squares = squaresRemoved.concat(squares);
squares.forEach((cell) => grid.appendChild(cell));
}
}
}
// Game over
function gameOver() {
if (
current.some((index) =>
squares[currentPosition + index].classList.contains("taken")
)
) {
scoreDisplay.innerHTML = "end";
clearInterval(timerId);
}
}
});