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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no,viewport-fit=contain" />
<meta name="description" content="Naive implementation of checkers with WebAssembly text format" />
<meta name="author" content="Michael Kalygin" />
<meta property="og:type" content="website" />
<meta property="og:title" content="WebAssembly Text Checkers" />
<meta property="og:description" content="Naive implementation of checkers with WebAssembly text format" />
<meta property="og:image" content="https://wasm-text-checkers-mkalygin.vercel.app/poster.png" />
<meta property="og:image:type" content="image/png" />
<meta property="og:image:width" content="1200" />
<meta property="og:image:height" content="628" />
<meta property="og:image:alt" content="WebAssembly Text Checkers" />
<meta name="twitter:title" content="WebAssembly Text Checkers" />
<meta name="twitter:description" content="Naive implementation of checkers with WebAssembly text format" />
<title>WebAssembly Text Checkers</title>
<style>
body {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
width: 100vw;
height: 100vh;
margin: 0;
padding: 0;
text-align: center;
font-family: monospace;
}
h1 {
margin-bottom: 0.2rem;
}
canvas {
width: 90vw;
height: 90vw;
max-width: 400px;
max-height: 400px;
border: 2px solid black;
}
</style>
</head>
<body>
<a href="https://github.com/mkalygin/wasm-text-checkers" class="github-corner" aria-label="View source on GitHub"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style>
<h1>WebAssembly Text Checkers</h1>
<h3>Current Turn: <span>Black</span></h3>
<canvas></canvas>
<script>
const EMPTY = 0b0000;
const BLACK = 0b0001;
const WHITE = 0b0010;
const CROWNED_BLACK = 0b0101;
const CROWNED_WHITE = 0b0110;
const runTests = instance => {
const {
offsetForPosition,
isWhite,
isBlack,
isCrowned,
withCrown,
withoutCrown,
getPiece,
setPiece,
isCurrentPlayerPiece,
getCurrentPlayer,
setCurrentPlayer,
toggleCurrentPlayer,
shouldCrownPiece,
crownPiece,
} = instance.exports;
console.log('Offset for (3, 4) is', offsetForPosition(3, 4));
console.log('White is white?', isWhite(WHITE));
console.log('Black is black?', isBlack(BLACK));
console.log('Black is white?', isWhite(BLACK));
console.log('Uncrowned white is white?', isWhite(withoutCrown(CROWNED_WHITE)));
console.log('Uncrowned black is black?', isBlack(withoutCrown(CROWNED_BLACK)));
console.log('Crowned black is crowned?', isCrowned(CROWNED_BLACK));
console.log('Crowned white is crowned?', isCrowned(CROWNED_WHITE));
console.log('No piece at (3, 4)', getPiece(3, 4));
setPiece(3, 4, CROWNED_WHITE);
console.log('White crowned piece at (3, 4)', isCrowned(getPiece(3, 4)) && isWhite(getPiece(3, 4)));
console.log('Current player is black?', isBlack(getCurrentPlayer()));
console.log('Black is current player piece?', isCurrentPlayerPiece(BLACK));
console.log('Crowned black is current player piece?', isCurrentPlayerPiece(CROWNED_BLACK));
toggleCurrentPlayer();
console.log('Current player is white?', isWhite(getCurrentPlayer()));
console.log('White is current player piece?', isCurrentPlayerPiece(WHITE));
console.log('Crowned white is current player piece?', isCurrentPlayerPiece(CROWNED_WHITE));
setPiece(0, 7, WHITE);
setPiece(1, 7, BLACK);
setPiece(0, 6, WHITE);
setPiece(1, 6, BLACK);
console.log('Should crown a white piece at (0, 7)?', shouldCrownPiece(0, 7));
console.log('Should crown a black piece at (1, 7)?', shouldCrownPiece(1, 7));
console.log('Should crown a white piece at (0, 6)?', shouldCrownPiece(0, 6));
console.log('Should crown a black piece at (1, 6)?', shouldCrownPiece(1, 6));
console.log('White crowned piece at (0, 7)?', isCrowned(getPiece(0, 7)));
crownPiece(0, 7);
console.log('White crowned piece at (0, 7)?', isCrowned(getPiece(0, 7)));
setPiece(0, 0, BLACK);
setPiece(1, 0, WHITE);
setPiece(0, 1, BLACK);
setPiece(1, 1, WHITE);
console.log('Should crown a black piece at (0, 0)?', shouldCrownPiece(0, 0));
console.log('Should crown a white piece at (1, 0)?', shouldCrownPiece(1, 0));
console.log('Should crown a black piece at (0, 1)?', shouldCrownPiece(0, 1));
console.log('Should crown a white piece at (1, 1)?', shouldCrownPiece(1, 1));
console.log('Black crowned piece at (0, 0)?', isCrowned(getPiece(0, 0)));
crownPiece(0, 0);
console.log('Black crowned piece at (0, 0)?', isCrowned(getPiece(0, 0)));
}
const onModuleLoad = (instance) => {
runTests(instance);
const $canvas = document.querySelector('canvas');
const $turn = document.querySelector('h3 span');
const ctx = $canvas.getContext('2d');
const BOARD_SIZE = $canvas.offsetWidth;
const SQUARE_SIZE = BOARD_SIZE / 8;
const PIECE_SIZE = SQUARE_SIZE / 3;
const SELECTION_OPACITY = 0.6;
let selected = null;
const {
isWhite,
isBlack,
isCrowned,
getPiece,
isCurrentPlayerPiece,
getCurrentPlayer,
movePiece,
initBoard,
} = instance.exports;
const isSelectedSquare = (x, y) => {
if (!selected) return false;
return isSelectedPiece(x, y) || !getPiece(x, y) &&
Math.abs(x - selected.x) <= 1 && Math.abs(y - selected.y) <= 1;
};
const isSelectedPiece = (x, y) => {
if (!selected) return false;
return x === selected.x && y === selected.y;
};
const drawSquare = (x, y) => {
const isSelected = isSelectedSquare(x, y);
const color = (x + y) % 2 === 0 ? 'burlywood' : 'saddlebrown';
const sx = x * SQUARE_SIZE;
const sy = y * SQUARE_SIZE;
ctx.fillStyle = color;
ctx.globalAlpha = isSelected ? SELECTION_OPACITY : 1;
ctx.fillRect(sx, sy, SQUARE_SIZE, SQUARE_SIZE);
ctx.globalAlpha = 1;
};
const drawPiece = (x, y) => {
const piece = getPiece(x, y);
if (!piece) return;
const isSelected = isSelectedPiece(x, y);
const color = isBlack(piece) ? 'black' : 'white';
const stroke = isSelected ? 'rgba(0, 128, 0, 0.6)' : 'transparent';
const crown = isCrowned(piece);
const px = (x + 0.5) * SQUARE_SIZE;
const py = (y + 0.5) * SQUARE_SIZE;
ctx.fillStyle = color;
ctx.strokeStyle = stroke;
ctx.beginPath();
ctx.arc(px, py, PIECE_SIZE, 0, 2 * Math.PI);
ctx.closePath();
ctx.fill();
ctx.lineWidth = 2;
ctx.stroke();
if (!crown) return;
ctx.fillStyle = 'gold';
ctx.beginPath();
ctx.arc(px, py, PIECE_SIZE / 2, 0, 2 * Math.PI);
ctx.closePath();
ctx.fill();
};
const drawBoard = () => {
requestAnimationFrame(() => {
$canvas.style.background = 'green';
$canvas.width = BOARD_SIZE;
$canvas.height = BOARD_SIZE;
ctx.clearRect(0, 0, BOARD_SIZE, BOARD_SIZE);
for (let x = 0; x < 8; ++x) {
for (let y = 0; y < 8; ++y) {
drawSquare(x, y);
drawPiece(x, y);
}
}
$turn.innerText = getCurrentPlayer() === 1 ? 'Black' : 'White';
});
};
const setSelection = (x, y) => {
selected = { x, y };
};
const resetSelection = () => {
selected = null;
};
const handleSelection = (x, y) => {
const piece = getPiece(x, y);
const isSelected = !!selected;
if (piece && !isCurrentPlayerPiece(piece)) return;
if (piece && !isSelected) setSelection(x, y);
if (!piece && isSelected) movePiece(selected.x, selected.y, x, y) && resetSelection();
};
const onBodyClick = ({ target, offsetX, offsetY }) => {
if (target && target.tagName === 'CANVAS') {
const x = Math.floor(offsetX / SQUARE_SIZE);
const y = Math.floor(offsetY / SQUARE_SIZE);
handleSelection(x, y);
} else {
resetSelection();
}
drawBoard();
};
initBoard();
drawBoard();
document.addEventListener('click', onBodyClick);
};
const onPieceMoved = (fromX, fromY, toX, toY) => {
console.log(`Moved piece from (${fromX},${fromY}) to (${toX},${toY})`);
};
const onPieceCrowned = (x, y) => {
console.log(`Crowned piece at (${x},${y})`);
};
document.addEventListener('DOMContentLoaded', () => {
const moduleImport = {
events: {
piecemoved: onPieceMoved,
piececrowned: onPieceCrowned,
},
};
fetch('/checkers.wasm')
.then(response => response.arrayBuffer())
.then(bytes => WebAssembly.instantiate(bytes, moduleImport))
.then(({ instance }) => onModuleLoad(instance));
});
</script>
</body>
</html>