之前写 Life Game 时渲染用的是div，这次换 canvas 试试。
找了个canvas 库 p5i，用起来还可以
写着玩的，代码还有很多可优化的，懒得弄了。
代码
DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<script src="http://unpkg.com/p5i">script>
<title>五子棋demotitle>
head>
<body>
<div id="target">div>
<script>
useWuziqi();
function useWuziqi({ count = 15 } = {}) {
const steps = [];
let nextPlayer = 1;
let winner;
useUI();
function onPlayingStoneOnBoard(clickedStone) {
steps.push({
player: nextPlayer,
position: clickedStone,
});
if (checkWinning()) {
winner = nextPlayer;
} else {
nextPlayer = 3 - nextPlayer;
}
}
function checkWinning() {
const { player: lastPlayer, position: lastPosition } = steps[steps.length - 1];
const lastPlayerStepsPositions = steps
.filter((o) => o.player === lastPlayer)
.map((o) => o.position);
function checkCommon(xpianyiliang, ypianyiliang) {
let count = 1;
let xSpan = 0;
let ySpan = 0;
let flag = true;
while (flag) {
xSpan -= xpianyiliang;
ySpan -= ypianyiliang;
flag = lastPlayerStepsPositions.find((o) =>
isSamePosition(o, [lastPosition[0] + xSpan, lastPosition[1] + ySpan])
);
if (flag) {
count++;
}
}
xSpan = 0;
ySpan = 0;
flag = true;
while (flag) {
xSpan += xpianyiliang;
ySpan += ypianyiliang;
flag = lastPlayerStepsPositions.find((o) =>
isSamePosition(o, [lastPosition[0] + xSpan, lastPosition[1] + ySpan])
);
if (flag) {
count++;
}
}
return count === 5;
}
function checkHorizontal() {
return checkCommon(0, 1);
}
function checkVertical() {
return checkCommon(1, 0);
}
function check_leftTop_to_rightBottom() {
return checkCommon(1, 1);
}
function check_rightTop_to_leftBottom() {
return checkCommon(-1, 1);
}
return (
checkHorizontal() ||
checkVertical() ||
check_leftTop_to_rightBottom() ||
check_rightTop_to_leftBottom()
);
}
function useUI() {
const boardOffsetX = 40;
const boardOffsetY = 20;
const cellSize = 20;
const cellsPositions = [];
for (let i = 0; i < count; i++) {
cellsPositions.push([]);
for (let j = 0; j < count; j++) {
cellsPositions[i].push([boardOffsetX + j * cellSize, boardOffsetY + i * cellSize]);
}
}
function drawBoard({ line, rect, circle, fill, stroke }) {
const boardPadding = 10;
fill("aliceblue");
stroke("#ccc");
rect(
boardOffsetX - boardPadding,
boardOffsetY - boardPadding,
(count - 1) * cellSize + 2 * boardPadding
);
for (let i = 0; i < count; i++) {
for (let j = 0; j < count; j++) {
let y = boardOffsetY + i * cellSize;
line(boardOffsetX, y, (count - 1) * cellSize + boardOffsetX, y);
let x = boardOffsetX + j * cellSize;
line(x, boardOffsetY, x, (count - 1) * cellSize + boardOffsetY);
}
}
fill("#333");
circle(
boardOffsetX + ((count - 1) / 2) * cellSize,
boardOffsetY + ((count - 1) / 2) * cellSize,
5
);
}
let highlightCell;
function drawHighlightCross({ fill, rect, noStroke }) {
if (highlightCell) {
const [cellX, cellY] = cellsPositions[highlightCell[0]][highlightCell[1]];
noStroke();
fill("#535bf2");
rect(cellX - 5, cellY - 1, 10, 2);
rect(cellX - 1, cellY - 5, 2, 10);
}
}
function drawPlayedStones({ circle, fill, stroke }) {
steps.forEach((step) => {
const [cellX, cellY] = cellsPositions[step.position[0]][step.position[1]];
stroke("gray");
fill(step.player === 1 ? "black" : "white");
circle(cellX, cellY, 15);
});
}
function drawResults({ text, textSize }) {
if (winner) {
textSize(16);
text(winner === 1 ? "黑胜" : "白胜", 400, 20);
}
}
function replay() {
steps.length = 0;
winner = undefined;
}
let button;
function setup({ createCanvas, createButton }) {
createCanvas(500, 500);
button = createButton("REPLAY");
button.position(380, 50);
button.mousePressed(replay);
}
function draw({
background,
rect,
fill,
noStroke,
line,
stroke,
circle,
text,
textSize,
}) {
background("#fafafa");
noStroke();
drawBoard({ line, rect, circle, fill, stroke });
drawHighlightCross({ rect, fill, noStroke });
drawPlayedStones({ circle, fill, stroke });
drawResults({ text, textSize });
}
function mouseClicked({ mouseX, mouseY }) {
const clickedStone = findTargetStone({ mouseX, mouseY });
if (clickedStone) {
onPlayingStoneOnBoard(clickedStone);
}
}
function mouseMoved({ mouseX, mouseY }) {
highlightCell = findTargetStone({ mouseX, mouseY });
}
P5I.p5i({ setup, draw, mouseClicked, mouseMoved }, document.getElementById("target"));
function findTargetStone({ mouseX, mouseY }) {
if (winner) return;
for (let i = 0; i < count; i++) {
for (let j = 0; j < count; j++) {
const [cellX, cellY] = cellsPositions[i][j];
if (Math.pow(cellX - mouseX, 2) + Math.pow(cellY - mouseY, 2) <= 40) {
const avaliable = !steps.find((step) => isSamePosition(step.position, [i, j]));
if (avaliable) {
return [i, j];
}
}
}
}
return;
}
}
}
function isSamePosition(pos1, pos2) {
return pos1[0] === pos2[0] && pos1[1] === pos2[1];
}
script>
body>
html>
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