【问题标题】:Masking - Show div only on top of certain div?掩蔽 - 仅在某些 div 上显示 div?
【发布时间】:2020-02-08 19:38:52
【问题描述】:

我正在尝试使用 HTML 和 CSS 创建一个“眨眼”动画。

我想要的是,当眼睛眨眼时,眼球不显示。

从代码中可以看出,眼睛由 4 个元素组成。

Div“眼睛”是眼睛所在的容器。

div“eye1”和“eye2”。

div“眼罩”,有眨眼的效果。

div“eyeball1”和“eyeball2”。 这些应该只显示在“眼罩”的顶部,而不是“eye1”和“eye2”的顶部。

有人可以帮我实现这个目标吗?

body {
  margin: 0px;
}

#container {
  position: absolute;
  z-index: 100;
  width: 300px;
  height: 300px;
  background: lightblue;
  display: flex;
  justify-content: center;
  align-items: center;
}

#eyes {
  position: absolute;
  z-index: 12;
  width: 120px;
  height: 100px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#eye1,
#eye2 {
  z-index: 12;
}

#eye1,
#eye2,
#eyemask {
  position: absolute;
  width: 50px;
  height: 50px;
  background: #eee;
  display: flex;
  justify-content: center;
  align-items: center;
  clip-path: circle(50% at 50% 50%);
}

#eye2 {
  transform: translateX(60px);
}

#eyemask {
  background: #fff;
  animation-name: blink;
  animation-duration: 5s;
  animation-iteration-count: infinite;
}

@keyframes blink {
  0% {
    transform: scaleY(1);
  }
  20% {
    transform: scaleY(1);
  }
  30% {
    transform: scaleY(0);
  }
  40% {
    transform: scaleY(1);
  }
  100% {
    transform: scaleY(1);
  }
}

#eyeball1,
#eyeball2 {
  position: absolute;
  z-index: 11;
  width: 10px;
  height: 10px;
  background: #000;
  clip-path: circle(50% at 50% 50%);
}
<head>
  <link rel="stylesheet" type="text/css" href="Eyes.css">
</head>

<body>
  <div id="container">
    <div id="eyes">
      <div id="eye1">
        <div id="eyemask"></div>
        <div id="eyeball1"></div>
      </div>
      <div id="eye2">
        <div id="eyemask"></div>
        <div id="eyeball2"></div>
      </div>
    </div>
  </div>
</body>

这里有人可以帮我实现吗?

【问题讨论】:

    标签: html css css-animations clip-path


    【解决方案1】:

    您可以像下面这样简化代码并依赖剪辑路径动画:

    .eyes {
      padding:20px;
      background: lightblue;
      display: inline-flex;
    }
    
    .eyes span{
      width: 80px;
      height: 80px;
      background:grey;
      border-radius:50%;
      margin:10px;
      position:relative;
    }
    .eyes span:before {
      content:"";
      position:absolute;
      top:0;
      left:0;
      right:0;
      bottom:0;
      background:radial-gradient(black 7px, white 8px);
      animation:blink 0.8s linear infinite alternate;
    }
    @keyframes blink {
      from {
        clip-path: ellipse(50% 50% at 50% 50%);  
      }
      to {
        clip-path: ellipse(50%  0% at 50% 50%);
      }
    }
    <div class="eyes">
      <span></span>
      <span></span>
    </div>

    【讨论】:

      【解决方案2】:

      #eyemask 中创建#eyeball 就可以了

      body {
        margin: 0px;
      }
      
      #container {
        position: absolute;
        z-index: 100;
        width: 300px;
        height: 300px;
        background: lightblue;
        display: flex;
        justify-content: center;
        align-items: center;
      }
      
      #eyes {
        position: absolute;
        z-index: 12;
        width: 120px;
        height: 100px;
        display: flex;
        justify-content: space-between;
        align-items: center;
      }
      
      #eye1,
      #eye2 {
        z-index: 12;
      }
      
      #eye1,
      #eye2,
      #eyemask {
        position: absolute;
        width: 50px;
        height: 50px;
        background: #eee;
        display: flex;
        justify-content: center;
        align-items: center;
        clip-path: circle(50% at 50% 50%);
      }
      
      #eye2 {
        transform: translateX(60px);
      }
      
      #eyemask {
        background: #fff;
        animation-name: blink;
        animation-duration: 5s;
        animation-iteration-count: infinite;
      }
      
      @keyframes blink {
        0% {
          transform: scaleY(1);
        }
        20% {
          transform: scaleY(1);
        }
        30% {
          transform: scaleY(0);
        }
        40% {
          transform: scaleY(1);
        }
        100% {
          transform: scaleY(1);
        }
      }
      
      #eyeball1,
      #eyeball2 {
        position: absolute;
        z-index: 11;
        width: 10px;
        height: 10px;
        background: #000;
        clip-path: circle(50% at 50% 50%);
      }
      <head>
        <link rel="stylesheet" type="text/css" href="Eyes.css">
      </head>
      
      <body>
        <div id="container">
          <div id="eyes">
            <div id="eye1">
              <div id="eyemask">
                <div id="eyeball1"></div>
              </div>
            </div>
            <div id="eye2">
              <div id="eyemask">
                <div id="eyeball2"></div>
              </div>
            </div>
          </div>
        </div>
      </body>

      【讨论】:

      • 是的,如果没有其他解决方案,我会这样做。但是,如果我只想让白色部分闪烁,而不是眼球呢?使用像 Animate CC 这样的工具很容易实现,但我想知道我是否可以仅使用 HTML 和 CSS 来做到这一点。
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