本文实例为大家分享了canvas实现五子棋小游戏的具体代码,供大家参考,具体内容如下
效果
思路
- canvans 绘制棋盘,绘制时候边缘预留棋子位置
- 监听点击事件绘制落子并记录到字典中
- 获胜判定,在四个方向上检测是否有足够数量的连贯棋子
代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>ym</title> <style> canvas { display: block; margin: 0 auto; border: 0 } .result { text-align: center; } button{ display: block; margin: 0 auto; padding: 4px 20px; border:0; color: #fff; outline: none; border-radius: 3px; background: #43a6ff } button:hover{ font-weight: bold; cursor: pointer; } </style> </head> <body> <canvas id="cv" width="200px" height="200px"></canvas> <p class="result"></p> <button onclick="loadPanel(400, 400,30,13)">刷新</button> <script> loadPanel(400, 400,30,13); /** * 1) 点击落子并切换执子者 * 2)以当前落子位置为基准,以‘米'字型判定,是否能构成五连及以上 * @param w 棋盘宽度 * @param h 棋盘高度 * @param cs 格子尺寸 * @param ps 棋子半径 */ function loadPanel(w, h, cs, ps) { let i, j, k; let chks = [[1, 0], [0, 1], [1, 1], [1, -1]];//水平,纵向,斜下,斜上 四个方向 let successNum = 5;//赢棋标准 let resultEl = document.querySelector('.result'); //1)绘制棋盘,边缘应隔开棋子半径的距离 cs = cs || 16;//默认格子宽高 ps = ps || 4;//棋子半径 h = h || w;//高度默认等于宽度 let el = document.getElementById('cv'); el.setAttribute('width', w + 'px'); el.setAttribute('height', h + 'px'); let context = el.getContext("2d"); //计算棋盘分割,向下取整 let splitX = ~~((w - 2 * ps) / cs), splitY = ~~((h - 2 * ps) / cs); //初始化落子位置使用字典存储,相较于数组简单且减少内存占用 let pieces = {}; //循环划线 context.translate(ps, ps); context.beginPath(); context.strokeStyle = '#000'; //垂直线 for (i = 0; i < splitX + 1; i++) { context.moveTo(cs * i, 0); context.lineTo(cs * i, splitY * cs); context.stroke(); } //水平线 for (j = 0; j < splitY + 1; j++) { context.moveTo(0, cs * j); context.lineTo(splitX * cs, cs * j); context.stroke(); } context.closePath(); let user = 0, colors = ['#000', '#fefefe']; el.addEventListener('click', function (e) { let x = e.offsetX, y = e.offsetY, //计算落子范围 rx = ~~((x - ps) / cs) + (((x - ps) % cs <= cs / 2) ? 0 : 1), ry = ~~((y - ps) / cs) + (((y - ps) % cs <= cs / 2) ? 0 : 1); //绘制棋子 context.beginPath(); context.arc(cs * rx, cs * ry, ps, 2 * Math.PI, false); context.fillStyle = colors[user]; context.strokeStyle = '#000'; user ? user = 0 : user = 1;//切换执子者 context.fill(); context.stroke(); context.closePath(); //记录棋子位置 let piece = pieces[rx + '-' + ry] = user; //米字型计算结果,以当前落子位置计算是否存在某个方向上具有连续的五个相同棋子 for (j = 0; j < chks.length; j++) { let num = 1, chk = chks[j]; for (i = 1; i <= 4; i++) { if (pieces[(rx + chk[0] * i) + '-' + (ry + chk[1] * i)] == piece) { num++ } else { for (i = -1; i >= -4; i--) { if (pieces[(rx + chk[0] * i) + '-' + (ry + chk[1] * i)] == piece) { num++ } } break } } if (num == successNum) { resultEl.innerHTML = ['白', '黑'][user] + '方赢'; break; } } }) } </script> </body> </html>
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持NICE源码。