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go.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="Basic Go Game UI">
<title>Go</title>
<style>
body {
background-color: #000;
color: #fff;
}
canvas {
width: 761px;
height: 761px;
}
</style>
</head>
<body>
<canvas id="c" width="761" height="761"></canvas><br>
<input type="button" value="Clear" id="clear">
<input type="button" value="Undo" id="undo">
<input type="button" value="Pass" id="pass">
<input type="checkbox" id="editing">
<label for="editing">Edit board</label>
<input type="radio" name="color" id="black" value="1" checked disabled><label for="black">Black</label>
<input type="radio" name="color" id="white" value="-1" disabled><label for="white">White</label>
<input type="radio" name="color" id="empty" value="0" disabled><label for="empty">Empty</label>
<script type="text/javascript">'use strict';
const t = c.getContext('2d'), side = 40, radius = 20;
let board = new Array(19), player = 1;
for(let i = 19; i--;) board[i] = new Int8Array(19);
let prevBoard = board.map(col => col.slice());
c.addEventListener('click', e => {
const x = e.offsetX / side | 0, y = e.offsetY / side | 0;
if(editing.checked) {
prevBoard = board.map(col => col.slice());
const c = +document.querySelector('input[name="color"]:checked').value;
if(board[x][y] == c)
board[x][y] = 0;
else
board[x][y] = c;
draw();
return;
}
if(board[x][y])
return;
const nextBoard = board.map(col => col.slice());
nextBoard[x][y] = player;
if(x > 0 && nextBoard[x - 1][y] == -player)
capturePieces(nextBoard, x - 1, y);
if(x <18 && nextBoard[x + 1][y] == -player)
capturePieces(nextBoard, x + 1, y);
if(y > 0 && nextBoard[x][y - 1] == -player)
capturePieces(nextBoard, x, y - 1);
if(y <18 && nextBoard[x][y + 1] == -player)
capturePieces(nextBoard, x, y + 1);
if(capturePieces(nextBoard, x, y))
return;
if(nextBoard.every((col, i) => col.every((cell, j) => prevBoard[i][j] == cell)))
return;
prevBoard = board;
board = nextBoard;
white.checked = player == 1;
player = -player;
black.checked = player == 1;
draw();
});
function capturePieces(board, x, y) {
const visited = new Int32Array(19), stack = [[x, y]], group = [], c = board[x][y];
do {
const [x, y] = stack.pop();
group.push([x, y]);
visited[x] |= 1 << y;
let d;
if(x > 0) {
d = x - 1;
if(!board[d][y])
return false;
if(board[d][y] == c && !(visited[d] >> y & 1))
stack.push([d, y]);
}
if(x < 18) {
d = x + 1;
if(!board[d][y])
return false;
if(board[d][y] == c && !(visited[d] >> y & 1))
stack.push([d, y]);
}
if(y > 0) {
d = y - 1;
if(!board[x][d])
return false;
if(board[x][d] == c && !(visited[x] >> d & 1))
stack.push([x, d]);
}
if(y < 18) {
d = y + 1;
if(!board[x][d])
return false;
if(board[x][d] == c && !(visited[x] >> d & 1))
stack.push([x, d]);
}
} while(stack.length);
for(const [x, y] of group)
board[x][y] = 0;
return true;
}
function draw() {
t.fillStyle = '#888';
t.fillRect(0, 0, 761, 761);
t.fillStyle = '#333';
for(let i = 19; i--;) {
t.fillRect(radius, i * side + radius, 721, 1);
t.fillRect(i * side + radius, radius, 1, 721);
}
t.strokeStyle = t.fillStyle = '#000';
t.strokeRect(141, 141, 480, 480);
for(let i = 15; i > 0; i -= 6)
for(let j = 15; j > 0; j -= 6) {
t.beginPath();
t.arc(i * side + radius + .5, j * side + radius + .5, 4, 0, Math.PI * 2);
t.fill();
}
for(let i = 19; i--;)
for(let j = 19; j--;)
if(board[i][j]) {
t.fillStyle = board[i][j] > 0 ? '#000' : '#fff';
t.beginPath();
t.arc(i * side + radius + .5, j * side + radius + .5, radius, 0, Math.PI * 2);
t.fill();
}
}
clear.addEventListener('click', e => {
if(!confirm("Are you sure to reset the game?"))
return;
for(let i = 19; i--;)
board[i].fill(0);
player = 1;
editing.checked = false;
black.checked = black.disabled = white.disabled = empty.disabled = true;
draw();
});
undo.addEventListener('click', e => {
[prevBoard, board] = [board, prevBoard];
draw();
if(editing.checked)
return;
white.checked = player == 1;
player = -player;
black.checked = player == 1;
});
pass.addEventListener('click', e => {
prevBoard = board.map(col => col.slice());
white.checked = player == 1;
player = -player;
black.checked = player == 1;
});
editing.addEventListener('input', e => {
for(const clr of document.getElementsByName('color'))
clr.disabled = !editing.checked;
if(!editing.checked) {
if(empty.checked)
black.checked = true;
player = +document.querySelector('input[name="color"]:checked').value;
}
});
draw();
</script>
</body>
</html>