CSS3鼠标HOVER图片悬停方向感知特效

这是一款使用CSS3制作的鼠标HOVER图片悬停方向感知特效。该特效能够在鼠标hover图片时，在图片上产生一个遮罩层，并且在移动鼠标时，遮罩层会根据鼠标的方向进行移动。

使用方法

HTML结构

该CSS3鼠标HOVER图片悬停方向感知特效的HTML结构如下：

<div class="container">
  <div class="row">
    <div class="col">
      <div class="photo-container" style="background-image:url(img/1.jpg)"></div>
      <h2>图片标题 </h2>
      <div class="slide">
        <p>图片的描述文本</p>
      </div>
    </div>
    <div class="col">
      <div class="photo-container" style="background-image:url(img/2.jpg)"></div>
      <h2>图片标题 </h2>
      <div class="slide">
        <p>图片的描述文本</p>
      </div>
    </div>
    ......
  </div>
</div>               
                

CSS样式

使用下面的CSS代码来制作一个九宫格布局的图片画廊：

.container {
  margin: 0 auto;
  padding: 2rem;
  max-width: 1200px;
}

.row {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
}

.col {
  color: #fff;
  -webkit-box-flex: 1;
      -ms-flex: 1 1 auto;
          flex: 1 1 auto;
  min-height: 260px;
  position: relative;
}
.col h2 {
  font-weight: 300;
  font-size: 1.33333rem;
  line-height: 1.25;
  margin: 0;
  position: absolute;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 0;
}

.col:nth-child(2) {
  min-width: 20%;
}

.col:nth-child(4) {
  min-width: 33%;
}

.col:nth-child(3) + .col:nth-child(3) {
  min-width: 50%;
}

.photo-container {
  background: #0f0523 50% 50% / cover;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  -webkit-transition: 1s;
  transition: 1s;
  -webkit-transform-origin: bottom right;
          transform-origin: bottom right;
}
.photo-container::before {
  background: -webkit-linear-gradient(transparent, rgba(67, 17, 51, 0.5), #000320);
  background: linear-gradient(transparent, rgba(67, 17, 51, 0.5), #000320);
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}
.col:hover .photo-container {
  -webkit-transform: scale(1.25);
          transform: scale(1.25);
}

.slide {
  background: rgba(25, 1, 21, 0.8);
  padding: 0 1.5rem;
}                 
                

产生方向感知的核心CSS3代码如下：

.col {
  overflow: hidden;
  position: relative;
}

.slide {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
 
  -webkit-transition: all 0.275s ease-in-out, visibility 0s 0.275s;
  transition: all 0.275s ease-in-out, visibility 0s 0.275s;
  visibility: hidden;
  will-change: transform;
  -webkit-transform: translateY(100%);
          transform: translateY(100%);
}

.row:hover ~ .row .slide {
  -webkit-transform: translateY(-100%);
          transform: translateY(-100%);
}
.row:hover .slide {
  -webkit-transform: translateX(100%);
          transform: translateX(100%);
}
.row:hover .col:hover ~ .col .slide {
  -webkit-transform: translateX(-100%);
          transform: translateX(-100%);
}
.row:hover .col:hover .slide {
  -webkit-transform: none;
          transform: none;
  visibility: visible;
  -webkit-transition-delay: 0s;
          transition-delay: 0s;
}