炫酷鼠标hover图片幻影跟随动画特效

这是一款炫酷的鼠标hover图片幻影跟随动画特效。该特效在鼠标hover图片时，会产生多种颜色形成的堆叠卡片幻影，跟随图片移动，效果非常炫酷。

使用方法

HTML结构

该图片hover效果的HMLT结构如下：

<div class="grid grid--effect-vega">
  <a href="#" class="grid__item grid__item--c1">
    <div class="stack">
      <div class="stack__deco"></div>
      <div class="stack__deco"></div>
      <div class="stack__deco"></div>
      <div class="stack__deco"></div>
      <div class="stack__figure">
        <img class="stack__img" src="img/1.png" alt="Image"/>
      </div>
    </div>
    <div class="grid__item-caption">
      <h3 class="grid__item-title">anaerobic</h3>
      <div class="column column--left">
        <span class="column__text">Period</span>
        <span class="column__text">Subjects</span>
        <span class="column__text">Result</span>
      </div>
      <div class="column column--right">
        <span class="column__text">2045</span>
        <span class="column__text">133456</span>
        <span class="column__text">Positive</span>
      </div>
    </div>
  </a>
  <a href="#" class="grid__item grid__item--c2"><!-- ... --></a>
  <a href="#" class="grid__item grid__item--c2"><!-- ... --></a>
</div><!-- /grid -->
                

CSS样式

在CSS布局中使用flexbox进行布局，其中，堆叠的幻影图片的css样式如下：

.stack {
  position: relative;
  width: 100%;
  height: 200px;
  transform-style: preserve-3d;
}

.stack__deco {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: currentColor;
  transform-origin: 50% 100%;
}

.stack__deco:first-child {
  opacity: 0.2;
}

.stack__deco:nth-child(2) {
  opacity: 0.4;
}

.stack__deco:nth-child(3) {
  opacity: 0.6;
}

.stack__deco:nth-child(4) {
  opacity: 0.8;
}

.stack__figure {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  width: 100%;
  height: 100%;
  cursor: pointer;
  transform-origin: 50% 100%;
}

.stack__img {
  position: relative;
  display: block;
  flex: none;
}
                

JAVASCRIPT

特效中使用js来驱动动画效果，其中的一种效果的js代码如下：

HamalFx.prototype._in = function() {
  var self = this;

  this.DOM.stackItems.map(function(e, i) {
    e.style.opacity = i !== self.totalItems - 1 ? 0.2*i+0.2 : 1
  });

  anime({
    targets: this.DOM.stackItems,
    duration: 1000,
    easing: 'easeOutExpo',
    translateY: function(target, index) {
      return -1*index*5;
    },
    rotate: function(target, index, cnt) {
      if( index === cnt - 1 ) {
        return 0;
      }
      else {
        return index%2 ? (cnt-index)*1 : -1*(cnt-index)*1;
      }
    },
    scale: function(target, index, cnt) {
      if( index === cnt - 1 ) {
        return 1;
      }
      else {
        return 1.05;
      }
    },
    delay: function(target, index, cnt) {
      return (cnt-index-1)*30
    }
  });
  
  anime({
    targets: this.DOM.img,
    duration: 1000,
    easing: 'easeOutExpo',
    scale: 0.7
  });

  anime({
    targets: [this.DOM.columns.left, this.DOM.columns.right],
    duration: 1000,
    easing: 'easeOutExpo',
    translateX: function(target, index) {
      return index === 0 ? -30 : 30;
    }
  });
  
};

HamalFx.prototype._out = function() {
  var self = this;

  anime({
    targets: this.DOM.stackItems,
    duration: 500,
    easing: 'easeOutExpo',
    translateY: 0,
    rotate: 0,
    scale: 1,
    opacity: function(target, index, cnt) {
      return index !== cnt - 1 ? 0 : 1
    }
  });

  anime({
    targets: this.DOM.img,
    duration: 1000,
    easing: 'easeOutElastic',
    scale: 1
  });

  anime({
    targets: [this.DOM.columns.left, this.DOM.columns.right],
    duration: 500,
    easing: 'easeOutExpo',
    translateX: 0
  });
};                  
                

该鼠标hover图片幻影跟随动画特效的github地址为：https://github.com/codrops/StackMotionHoverEffects/