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javascript結合Flexbox簡單實現滑動拼圖游戲
編輯:關於JavaScript     

滑動拼圖就是把一張圖片分成幾等份,打亂順序(下圖),然後通過滑動拼湊成一張完整的圖片。

要實現一個拼圖游戲,需要考慮怎樣隨機的打亂順序,怎樣交換兩張圖片的位置,等等。但是,使用了Flexbox布局以後,這都不需要你去考慮,浏覽器會幫你做,Flexbox就是這麼的強大。關於Flexbox的介紹可以點擊這裡。
這個游戲中要用的是Flexbox布局的order屬性,order屬性可以用來控制Flex項目的順序。
這裡我用九個canvas元素來把圖片分成九等分,也可以用其他方法,比如背景圖片定位:

<div class="wrap">
  <canvas></canvas>
  <canvas></canvas>
  <canvas></canvas>
  <canvas></canvas>
  <canvas></canvas>
  <canvas></canvas>
  <canvas></canvas>
  <canvas></canvas>
  <canvas></canvas>
</div>

如果不僅限於九宮格,還要十六宮格等,上面的元素完全可以動態生成。
下面是生成打亂順序的九張圖代碼:

var drawImage = function (url) {
  return new Promise(function (resolve, reject) {
    var img = new Image();
    img.onload = function () {
      resolve(img);
    };
    img.src = url;
  })
};

drawImage("2.jpg").then(function (img) {
  var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
  var random = arr.sort(function() {return Math.random() > 0.5});
  [].forEach.call(document.querySelectorAll("canvas"), function (item, i) {
    item.width = $(".wrap").clientWidth / 3;
    item.height = $(".wrap").clientHeight / 3;
    item.style.order = random[i];
    var ctx = item.getContext("2d");
    ctx.drawImage(img, img.width * (i % 3) / 3, img.height * Math.floor(i / 3) / 3, img.width / 3, img.height / 3, 0, 0, item.width, item.height);
  });
});

上面的關鍵代碼是:

item.style.order = random[i];

通過將數字打亂順序,隨機賦值給每個canvas元素的order屬性,這樣浏覽器就自動幫你排序了。
關於代碼的其他細節就不講了,這裡說一下怎樣交換兩張圖片的位置,真是出乎意料的簡單:

var order1 = item.style.order;
var order2 = target.style.order;

只需要交換雙方的order屬性值就可以了。

完整代碼

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport" />
  <meta content="yes" name="apple-mobile-web-app-capable" />
  <meta content="black" name="apple-mobile-web-app-status-bar-style" />
  <meta content="telephone=no" name="format-detection" />
  <title></title>
  <style>
    html, body {
      height: 100%;
    }
    body {
      margin: 0;
      padding: 0;
      overflow: hidden;
    }
    .wrap {
      display: flex;
      flex-wrap: wrap;
      width: 100%;
      height: 100%;
      overflow: hidden;
    }
    .wrap canvas {
      width: 33.3333%;
      height: 33.3333%;
      border: 1px solid red;
      box-sizing: border-box;
    }
  </style>
</head>
<body>
<div class="wrap">
  <canvas data-value="1"></canvas>
  <canvas data-value="2"></canvas>
  <canvas data-value="3"></canvas>
  <canvas data-value="4"></canvas>
  <canvas data-value="5"></canvas>
  <canvas data-value="6"></canvas>
  <canvas data-value="7"></canvas>
  <canvas data-value="8"></canvas>
  <canvas data-value="9"></canvas>
</div>
<script>
  var $ = function (el) {
    return document.querySelector(el);
  };
  var touchMove, touchEnd;
  var drawImage = function (url) {
    return new Promise(function (resolve, reject) {
      var img = new Image();
      img.onload = function () {
        resolve(img);
      };
      img.src = url;
    })
  };
  drawImage("2.jpg").then(function (img) {
    var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
    var random = arr.sort(function() {return Math.random() > 0.5});
    [].forEach.call(document.querySelectorAll("canvas"), function (item, i) {
      item.width = $(".wrap").clientWidth / 3;
      item.height = $(".wrap").clientHeight / 3;
      item.style.order = random[i];
      var ctx = item.getContext("2d");
      ctx.drawImage(img, img.width * (i % 3) / 3, img.height * Math.floor(i / 3) / 3, img.width / 3, img.height / 3, 0, 0, item.width, item.height);
    });
  });
  document.addEventListener("touchstart", function (e) {
    var target = e.target;
    if (e.target.tagName.toLowerCase() !== "canvas") {
      return;
    }
    var ctx = target.getContext("2d");
    var image = ctx.getImageData(0, 0, target.width, target.height);
    var obj = target.cloneNode(true);
    obj.getContext("2d").putImageData(image, 0, 0);
    var top = target.getBoundingClientRect().top, left = target.getBoundingClientRect().left;
    obj.style.cssText = "position: absolute; top: " + top + "px; left: " + left + "px";
    document.body.appendChild(obj);
    var point = {"x": e.touches[0].pageX, "y": e.touches[0].pageY};
    document.addEventListener("touchmove", touchMove = function (e) {
      obj.style.cssText = "position: absolute; top:" + (e.touches[0].pageY - point.y + top) + "px; left: " + (e.touches[0].pageX - point.x + left) + "px";
    });
    document.addEventListener("touchend", touchEnd = function (e) {
      var pos = {"x": e.changedTouches[0].pageX, "y": e.changedTouches[0].pageY};
      [].forEach.call(document.querySelectorAll(".wrap canvas"), function (item, i) {
        var offset = item.getBoundingClientRect();
        if (pos.x > offset.left && pos.x < (offset.left + item.width) && pos.y > offset.top && pos.y < (offset.top + item.height)) {
          var order1 = item.style.order;
          var order2 = target.style.order;
          if (obj.parentNode) {
            document.body.removeChild(obj);
          }
          item.style.order = order2;
          target.style.order = order1;
        }
      });
      document.removeEventListener("touchmove", touchMove);
      document.removeEventListener("touchend", touchEnd);
    })
  })
</script>
</body>
</html>

大家做測試的時候,最好用谷歌模擬器或者手機打開,因為只支持移動端觸摸事件。

代碼中只實現了基本功能,並沒有實現完整功能。

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