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小編給大家分享一下JavaScript中Canvas如何實現井字棋游戲，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！
具體內容如下
index.html
<!DOCTYPE html>
<html>
<head>
<title>Tic Tac Toe</title>
<style>
* {
padding: 0;
margin: 0;
}
body, html, #game {
height: 100%;
background: #FCFCFC;
}
#game {
display: flex;
align-items: center;
justify-content: center;
}
</style>
</head>
<body>
<div id="game">
<canvas id="canvas" width="300" height="300"></canvas>
</div>
<script src="game.js"></script>
</body>
</html>game.js
players = 2;
cell_count = 3;
winCount = 3;
cell_size = 100;
size = cell_size * cell_count;
var canvas = document.getElementById('canvas');
canvas.width = size;
canvas.height = size;
canvas.addEventListener('click', click, false);
var ctx = canvas.getContext('2d');
ctx.imageSmoothingEnabled = false;
ctx.lineWidth = 3;
function clear() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
}
function line(x, y, w, h, color = '#ccc') {
ctx.beginPath();
ctx.moveTo(x, y);
ctx.lineTo(x + w, y + h);
ctx.strokeStyle = color;
ctx.stroke();
ctx.closePath();
}
function fillRect(i, j, color = '#F5F5F5') {
ctx.fillStyle = color;
ctx.fillRect(i * cell_size, j * cell_size, cell_size, cell_size);
}
var draw = {
grid: (color = '#ccc') => {
for (let i = 1; i < cell_count; i++) {
line(cell_size * i, 0, 0, size, color);
line(0, cell_size * i, size, 0, color);
}
},
// draw nothing, stub
0: (i, j, _) => {
},
// draw X figure
1: (i, j, color = '#3F51B5') => {
let left = (i + 0.1) * cell_size,
top = (j + 0.1) * cell_size,
size = 0.8 * cell_size;
line(left, top, size, size, color);
line(left + size, top, -size, size, color);
},
// draw O figure
2: (i, j, color = '#FF5722') => {
ctx.beginPath();
ctx.arc((i + 0.5) * cell_size, (j + 0.5) * cell_size, 0.4 * cell_size, 0, Math.PI * 2, false);
ctx.strokeStyle = color;
ctx.stroke();
ctx.closePath();
},
// draw Δ figure
3: (i, j, color = '#FDE619'/*'#FFEB3B'*/) => {
let center = (i + 0.5) * cell_size,
size = Math.sqrt(3) * 0.525 * cell_size,
top = (j + 0.125) * cell_size,
height = 0.75 * cell_size,
step = size / 2;
line(center, top, -step, height, color);
line(center, top, step, height, color);
line(center - step, top + height, size, 0, color);
}
};
let grid = new Array(cell_count * cell_count).fill(0),
get = (i, j) => grid[j * cell_count + i],
set = (i, j, val = 0) => grid[j * cell_count + i] = val,
isFree = (i, j) => get(i, j) == 0,
checkVictory = (who) => {
let iterate = getter => {
for (let i = 0; i < winCount; i++)
if (getter(i) != who)
return false;
return true;
};
let row, col, path = {
vertical: _ => iterate(i => get(row + i, col)),
horizntl: _ => iterate(j => get(col, row + j)),
diagonal: _ => iterate(i => get(row + i, col + i)),
opposite: _ => iterate(i => get(row + i, col + winCount - 1 - i)),
};
for (row = 0; row <= cell_count - winCount; row++) {
for (col = 0; col < cell_count; col++) {
if (path.vertical())
return ['vertical', row, col];
if (path.horizntl())
return ['horizntl', col, row];
}
for (col = 0; col <= cell_count - winCount; col++) {
if (path.diagonal())
return ['diagonal', row, col];
if (path.opposite())
return ['opposite', row, col];
}
}
return [];
},
onWin = ([type, row, col]) => {
if (!type)
return;
let iterate = action => {
for (let i = 0; i < winCount; i++)
action(i);
};
let drawSequence = {
vertical: _ => iterate(i => fillRect(row + i, col)),
horizntl: _ => iterate(j => fillRect(row, col + j)),
diagonal: _ => iterate(i => fillRect(row + i, col + i)),
opposite: _ => iterate(i => fillRect(row + i, col + winCount - 1 - i)),
};
clear();
drawSequence[type]();
draw.grid();
for (let i = 0; i < cell_count; i++) {
for (let j = 0; j < cell_count; j++)
draw[get(i, j)](i, j);
}
return true;
};
let playerTurn = 0;
function click(e) {
let i = e.offsetX / cell_size | 0,
j = e.offsetY / cell_size | 0;
if (isFree(i, j)) {
let figure = playerTurn++ % players + 1;
set(i, j, figure);
draw[figure](i, j);
onWin(checkVictory(figure)) && canvas.removeEventListener('click', click, false);
;
}
}
draw.grid();以上是“JavaScript中Canvas如何實現井字棋游戲”這篇文章的所有內容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內容對大家有所幫助，如果還想學習更多知識，歡迎關注億速云行業資訊頻道！
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