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tetris.html
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tetris.html
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<html>
<head><title>Tetris</title>
<style>
body {
display: grid;
grid-template-columns: 150px auto 200px;
gap: 10px;
}
section {
margin: 10px;
display: grid;
cursor: pointer;
}
section div {
width: 19px;
height: 19px;
}
#board div {
background: lightgrey;
}
#board {
grid-template-columns: repeat(10, 20px);
grid-template-rows: repeat(20, 20px);
}
#nextPiece {
grid-template-columns: repeat(4, 20px);
grid-template-rows: repeat(4, 20px);
}
button { margin-bottom: 20px;}
div.blu { background: blue !important; }
div.ora { background: darkorange !important; }
div.gre { background: green !important; }
div.pur { background: purple !important; }
div.cyn { background: darkcyan !important; }
div.yel { background: goldenrod !important; }
div.red { background: red !important; }
div.blink { border: 2px solid black; }
</style>
</head>
<body>
<div>
<h1>Tetris</h1>
<button id="start">Start</button>
<div>Score</div>
<div id=score>0</div>
<p id=message></p>
</div>
<section id=board>
<!-- 20x10 empty div elements will be added here. -->
</section>
<div>
Next Piece:
<section id=nextPiece>
<!-- 4x4 empty div elements will be added here. -->
</section>
</div>
<script>
const LEFT_CODE = 37, UP_CODE = 38, RIGHT_CODE = 39, DOWN_CODE = 40;
const BOARD_WIDTH = 10, BOARD_HEIGHT = 20;
const BLUE_BAR = {
width: 4, height: 1,
cells: [['blu', 'blu', 'blu', 'blu']],
};
const CYAN_TEE = {
width: 3,
height: 2,
cells: [
['cyn', 'cyn', 'cyn'],
[ '', 'cyn', '']],
};
const YELLOW_Z = {
width: 3,
height: 2,
cells: [
['yel', 'yel', ''],
[ '', 'yel', 'yel']],
};
const ORANGE_Z = {
width: 3,
height: 2,
cells: [
[ '', 'ora', 'ora'],
['ora', 'ora', '']],
};
const RED_BLOCK = {
width: 2,
height: 2,
cells: [
['red', 'red'],
['red', 'red']],
};
const GREEN_L = {
width: 3,
height: 2,
cells: [
['gre', 'gre', 'gre'],
['gre', '', '']],
};
const PURPLE_L = {
width: 3,
height: 2,
cells: [
['pur', 'pur', 'pur'],
[ '', '', 'pur']],
};
const PIECES =
[BLUE_BAR, CYAN_TEE, YELLOW_Z, ORANGE_Z, RED_BLOCK,
GREEN_L, PURPLE_L];
let currentPiece, nextPiece;
let score = 0, message = '';
// Create the HTML elements
let nextPieceArea = document.querySelector("#nextPiece");
for (let r=0; r<4; r++)
for (let c=0; c<4; c++) {
let newDiv = document.createElement('div');
newDiv.dataset.r = r;
newDiv.dataset.c = c;
nextPieceArea.appendChild(newDiv);
}
let nextPiecePixelList = document.querySelectorAll('#nextPiece div');
let boardArea = document.querySelector("#board");
for (let r=0; r<BOARD_HEIGHT; r++)
for (let c=0; c<BOARD_WIDTH; c++) {
let newDiv = document.createElement('div');
newDiv.dataset.r = r;
newDiv.dataset.c = c;
boardArea.appendChild(newDiv);
}
let pixelList = document.querySelectorAll('#board div');
let pixels = [];
let pixelListIndex = 0;
for (let r = 0; r<BOARD_HEIGHT; r++)
pixels.push([]);
for (pixel of pixelList) {
let r = Math.floor(pixelListIndex / BOARD_WIDTH);
pixels[r].push(pixel);
pixelListIndex++;
}
let running = false;
// Board is matrix of pixels that start with no color.
// The board only holds pieces that have landed, not the currently falling piece.
let board = [];
function initializeBoard() {
board = [];
for (let r=0; r<BOARD_HEIGHT; r++) {
let row = [];
board.push(row);
for (let c=0; c<BOARD_WIDTH; c++) {
row.push('');
}
}
}
function render() {
for (let r=0; r<BOARD_HEIGHT; r++)
for (let c=0; c<BOARD_WIDTH; c++)
pixels[r][c].className = board[r][c];
if (currentPiece) {
for (let r=0; r<currentPiece.height; r++)
for (let c=0; c<currentPiece.width; c++) {
if (currentPiece.cells[r][c])
pixels[r + currentPiece.y][c + currentPiece.x].className = currentPiece.cells[r][c];
}
}
if (nextPiece) {
let idx = 0;
for (let r=0; r<4; r++)
for (let c=0; c<4; c++) {
nextPiecePixelList[idx].className = (
(nextPiece.cells[r] && nextPiece.cells[r][c]) || '');
idx++;
}
}
document.querySelector('#score').innerText = score;
document.querySelector('#message').innerText = message;
}
initializeBoard();
render();
const NORTH = {dx: 0, dy: -2};
const SOUTH = {dx: 0, dy: 2};
const EAST = {dx: -2, dy: 0};
const WEST = {dx: 2, dy: 0};
let turnLength = 700;
function startNewPiece() {
currentPiece = nextPiece;
nextPiece = PIECES[Math.floor(Math.random() * PIECES.length)];
// Copy all the parts of the peice so that we can modify it.
currentPiece = JSON.parse(JSON.stringify(currentPiece));
currentPiece.x = Math.floor(BOARD_WIDTH / 2) - 2;
currentPiece.y = 0;
}
render();
function rotatePiece(tempPiece) {
newCells = [[], [], [], []];
for (let c=0; c<tempPiece.width; c++) {
for (let r=0; r<tempPiece.height; r++) {
newCells[c][tempPiece.height - r - 1] = tempPiece.cells[r][c];
}
}
let oldWidth = tempPiece.width;
tempPiece.width = tempPiece.height;
tempPiece.height = oldWidth;
tempPiece.cells = newCells;
}
// Would the falling piece be in conflict if it was at this location?
function hasConflict(tempPiece) {
for (let r=0; r<tempPiece.height; r++)
for (let c=0; c<tempPiece.width; c++) {
if (tempPiece.cells[r][c] == '') continue;
// check world boundaries
if (tempPiece.y + r >= BOARD_HEIGHT) return true;
if (tempPiece.x + c < 0 || tempPiece.x + c >= BOARD_WIDTH) return true;
// check previously landed pieces
if (board[tempPiece.y + r][tempPiece.x + c]) return true;
}
return false;
}
function isLanded() {
let tempPiece = JSON.parse(JSON.stringify(currentPiece));
tempPiece.y++;
return hasConflict(tempPiece);
}
function addPieceToBoard() {
for (let r=0; r<currentPiece.height; r++)
for (let c=0; c<currentPiece.width; c++) {
if (currentPiece.cells[r][c] == '') continue;
board[currentPiece.y + r][currentPiece.x + c] = currentPiece.cells[r][c];
}
score += 10;
}
function blinkRow(r, on) {
for (let c=0; c<BOARD_WIDTH; c++)
if (on)
pixels[r][c].classList.add('blink');
else
pixels[r][c].classList.remove('blink');
}
function removeRow(row) {
// scoot everything down, overwriting row.
for (let r=row; r>0; r--)
for (let c=0; c<BOARD_WIDTH; c++)
board[r][c] = board[r-1][c];
// blank out the top row.
for (let c=0; c<BOARD_WIDTH; c++)
board[0][c] = '';
}
function blinkAndRemoveRow(r) {
blinkRow(r, true);
window.setTimeout(() => blinkRow(r, false), 1);
window.setTimeout(() => blinkRow(r, true), 300);
window.setTimeout(() => blinkRow(r, false), 600);
window.setTimeout(() => blinkRow(r, true), 900);
window.setTimeout(() => removeRow(r), 1300);
}
function removeFullRows() {
let numFullRows = 0;
for (let r=0; r < BOARD_HEIGHT; r++) {
if (board[r].every((cellValue) => cellValue)) {
blinkAndRemoveRow(r);
numFullRows++;
}
}
score += numFullRows ** 2 * 1000;
turnLength = Math.max(250, turnLength - numFullRows * 5);
}
function gameOver() {
running = false;
message = 'Game over';
currentPiece = null;
render();
}
function update() {
if (isLanded()) {
addPieceToBoard();
removeFullRows();
startNewPiece();
if (hasConflict(currentPiece)) gameOver();
} else {
// apply gravity
currentPiece.y++;
}
}
function gameLoop() {
if (!running) return;
update();
render();
window.setTimeout(gameLoop, turnLength);
}
function start() {
running = true;
nextPiece = PIECES[Math.floor(Math.random() * PIECES.length)];
startNewPiece();
initializeBoard();
gameLoop();
message = 'Greetings!';
}
function moveLeft() {
let tempPiece = JSON.parse(JSON.stringify(currentPiece));
tempPiece.x--;
if (!hasConflict(tempPiece)) {
currentPiece.x--;
render();
}
}
function moveRight() {
let tempPiece = JSON.parse(JSON.stringify(currentPiece));
tempPiece.x++;
if (!hasConflict(tempPiece)) {
currentPiece.x++;
render();
}
}
function rotate() {
let tempPiece = JSON.parse(JSON.stringify(currentPiece));
rotatePiece(tempPiece);
if (!hasConflict(tempPiece)) {
rotatePiece(currentPiece);
render();
}
}
function advance() {
update();
render();
}
document.querySelector('#start').addEventListener('click', start);
document.addEventListener('keydown', (e) => {
if (!running) return;
if (e.keyCode == LEFT_CODE) moveLeft();
if (e.keyCode == RIGHT_CODE) moveRight();
if (e.keyCode == UP_CODE) rotate();
if (e.keyCode == DOWN_CODE) advance();
});
</script>
</body>
</html>