js canvas实现五子棋小游戏

Wilona ·

更新时间:2024-09-20

· 886 次阅读

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>

小游戏五子棋 canvas js

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