Panzoom 库并用居中图像填充 div

Question

Panzoom 库 (https://timmywil.com/panzoom/demo/) 允许您在 div:

中移动和缩放图像

var panzoom1 = Panzoom(document.querySelector(".zoom-area1"), {
  maxScale: 6
});
document.querySelector(".zoom-wrapper1").addEventListener("wheel", panzoom1.zoomWithWheel);


var panzoom2 = Panzoom(document.querySelector(".zoom-area2"), {
  maxScale: 6
});
document.querySelector(".zoom-wrapper2").addEventListener("wheel", panzoom2.zoomWithWheel);

.main-container {
  display: flex;
}
.zoom-wrapper1 {
  width: 300px;
  height: 300px;
  border: 5px solid #1C6EA4;
}

.zoom-wrapper2 {
  width: 300px;
  height: 300px;
  border: 5px solid #1C6EA4;
}

<script src="https://timmywil.com/panzoom/demo/panzoom.js"></script>
<div class="main-container">
  <div class="zoom-wrapper1">
    <div class="zoom-area1">
      <img src="https://ironcodestudio.com/wp-content/uploads/2015/03/css-remove-horizontal-scrollbar.jpg" />
    </div>
  </div>

  <div class="zoom-wrapper2">
    <div class="zoom-area2">
      <img src="https://image.freepik.com/free-photo/vertical-view-eiffel-tower-paris-france_1258-3169.jpg" />
    </div>
  </div>
</div>

一切正常。

现在我希望这些图像能够填充它们的 div 但是：

图像必须垂直和水平居中
如果图片是水平方向，其高度不能高于 div
如果图像是垂直方向，则其宽度不能大于 div 的宽度。就像这里一样：https://drive.google.com/file/d/1znFq-EJVE4Dv2j9sc3xZUZuMH0bhRsfz/view?usp=sharing

怎么做？我正在尝试不同的方法，但我已经运行没主意了。

Answer 1

我不确定，但我认为这没问题：

var zoomWraper1 = document.querySelector(".zoom-wrapper1");
var zoomWraper2 = document.querySelector(".zoom-wrapper2");

var panzoom1 = Panzoom(document.querySelector(".zoom-area1"), {
  maxScale: 6
});
zoomWraper1.addEventListener("wheel", panzoom1.zoomWithWheel);

var panzoom2 = Panzoom(document.querySelector(".zoom-area2"), {
  maxScale: 6
});
zoomWraper2.addEventListener("wheel", panzoom2.zoomWithWheel);

panzoom1.pan(0, 0);
panzoom1.zoom(300 / document.querySelector(".zoom-area1 img").height);

panzoom2.pan(0, 0);
panzoom2.zoom(300 / document.querySelector(".zoom-area2 img").width);

body {
    width: 100%;
    height: 100vh;
}

button {
  margin-right: 20px;
}

.main-container {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.zoom-wrapper1 {
    width: 300px;
    height: 300px;
    border: 5px solid #1c6ea4;
  display: flex;
    align-items: center;
    justify-content: center;
}

.zoom-wrapper2 {
    width: 300px;
    height: 300px;
    border: 5px solid #1c6ea4;
  display: flex;
    align-items: center;
    justify-content: center;
}

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="style.css">
    <title>Document</title>
</head>

<body>
    <div class="main-container">
        <div class="zoom-wrapper1">
            <div class="zoom-area1">
                <img src="https://images.unsplash.com/photo-1552288092-76e7d732366c?ixid=MnwxMjA3fDB8MHxzZWFyY2h8MXx8cGFub3JhbWljfGVufDB8fDB8fA%3D%3D&ixlib=rb-1.2.1&w=1000&q=80">
            </div>
        </div>
        <div class="zoom-wrapper2">
            <div class="zoom-area2">
                <img src="https://i2.wp.com/digital-photography-school.com/wp-content/uploads/2013/08/1.-Moraine_final.jpg">
            </div>
        </div>
    </div>
    <script src="https://timmywil.com/panzoom/demo/panzoom.js"></script>
    <script src="script.js"></script>
</body>

</html>

问题肯定是变焦向两侧逃逸，它没有指向鼠标指向的点。这需要改进。

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