期待实现矩形径向擦除动画显示

Question

我正在制作一个全角度的英雄动画，它会以径向擦除的方式显示图像/ HTML div。这是我到目前为止的内容：http://jsfiddle.net/andrewkerr/bjqSv/ - （下面的代码）主要基于这些部分：http://codepen.io/tmyg/pen/bwLom和http://css-tricks.com/css-pie-timer/ - 我遇到的问题是事实上，图像拼贴，因为动画分裂＆＃34;馅饼＆＃34;一半 - 我希望在没有图像拼贴的情况下执行效果。我并不反对Javascript解决方案。感谢。

//html
<div class="spinner-new">
  <span><em></em></span>
  <span><em></em></span>
</div>

//css
  .spinner-new {
  width: 100%;
  height: 400px;
  margin: 0 auto;
  position: relative;
  background:#3f9e35;
  overflow:hidden
}

.spinner-new span em {
  background-image:url('http://cdn.acidcow.com/pics/20100707/funny_family_photos_04.jpg');
    -webkit-animation-delay:1s;
    -webkit-animation-duration: 3s;
}

@-webkit-keyframes rotate-rt {
  0% {    -webkit-transform: rotate(0deg); }
  25% {   -webkit-transform: rotate(180deg); }
  50% {   -webkit-transform: rotate(180deg); }
  75% {   -webkit-transform: rotate(180deg); }
  100% {  -webkit-transform: rotate(180deg); }
}
@-webkit-keyframes rotate-lt {
  0% {    -webkit-transform: rotate(0deg); }
  25% {   -webkit-transform: rotate(0deg); }
  50% {   -webkit-transform: rotate(180deg); }
  75% {   -webkit-transform: rotate(180deg); }
  100% {  -webkit-transform: rotate(180deg); }
}

.spinner-new {
  position: relative;
}

.spinner-new span {
  width: 50%;
  height: 400%;
  overflow: hidden;
  position: absolute;
}

.spinner-new span:first-child {
  left: 0;
}

.spinner-new span:last-child {
  left: 50%;
}

.spinner-new span em {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-animation-iteration-count: 1;
  -webkit-animation-timing-function: linear;
  animation-fill-mode: forwards;
  -webkit-animation-fill-mode: forwards;
}

.spinner-new span:first-child em {
  left: 100%;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  -webkit-animation-name: rotate-lt; 
  -webkit-transform-origin: 0 12.5%;
}

.spinner-new span:last-child em {
  left: -100%;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  -webkit-animation-name: rotate-rt; 
  -webkit-transform-origin: 100% 12.5%;
 }

Answer 1

这是我的解决方案。

CSS

@-webkit-keyframes span-left {
  0%      {   right: 0%; }
  24.999% {   right: 0%;}
  25% {  right: 50%;}
  100% { right: 50%;}
}

@-webkit-keyframes rotate-first {
  0%      {   right: 100%;
              -webkit-transform: rotate(0deg);  
              -webkit-transform-origin: right center; }
  24.999% {   right: 100%;
              -webkit-transform: rotate(180deg);  
              -webkit-transform-origin: right center; }
  25% {  right: 0%;
              -webkit-transform: rotate(180deg);  
              -webkit-transform-origin: right center; } 
  50% {  right: 0%;
              -webkit-transform: rotate(360deg);  
              -webkit-transform-origin: right center; } 
  100% { right: 0%;
              -webkit-transform: rotate(360deg);  
              -webkit-transform-origin: right center; }
}

@-webkit-keyframes rotate-last {
   0%     { -webkit-transform: rotate(0deg);   opacity: 0; }
  24.999% { -webkit-transform: rotate(180deg); opacity: 0;}
  25% { -webkit-transform: rotate(180deg); opacity: 1;}
  50% {   -webkit-transform: rotate(360deg); opacity: 1; }
  100% {  -webkit-transform: rotate(360deg); opacity: 1;}
}

.spinner-new {
  width: 400px;
  height: 300px;
  position: relative;
  overflow:hidden;
  position: relative;
  left: 50px;
  top: 20px;
}


.spinner-new span {
  width: 50%;
  height: 100%;
  overflow: hidden;
  position: absolute;
}

.spinner-new span:first-child {
  right: 50%;
}

.spinner-new span:last-child {
  left: 50%;
}

.spinner-new span em {
  position: absolute;
  width: 100%;
  height: 100%;
}

.spinner-new span em,
.spinner-new span:first-child {
  -webkit-animation-duration: 30s;
  -webkit-animation-iteration-count: infinite;
  -webkit-animation-timing-function: linear;
}
.spinner-new span:first-child {
    -webkit-animation-name: span-left;
}
.spinner-new span:first-child em {
  -webkit-animation-name: rotate-first;
  overflow: hidden;
}

.spinner-new span:last-child em {
  left: 0;
  -webkit-animation-name: rotate-last;
  -webkit-transform-origin: left center;
  -webkit-transform: rotate(204deg);
 }
.spinner-new span em:after {
  content: "";
  position: absolute;
  width: 200%;
  height: 100%;
  top: 0px;
  background-image:url('image.jpg');
  background-size: cover;
}

.spinner-new span:first-child em:after {
  left: 0px;
}

.spinner-new span:last-child em:after {
  right: 0px;
}

最复杂的问题是重新使用左侧分裂元素作为右手开头。 我必须在动画中间将容器移到左侧。 背景图像设置为封面，所有大小均为百分比，因此此解决方案应完全响应

fiddle

该演示使迭代计数无限，因此更容易看到它继续。

Answer 2

可能不是实现这一目标的最优雅方式，但我最终使用CSS动画逐渐展示了馅饼。这是指向工作示例的链接：http://jsfiddle.net/andrewkerr/dsTm6/ - 下面的代码

    //html
    <div class="wrapper">
        <div class="headline">Some really cool supporting text</div>
        <div class='shutter-1 first' style="left:400px;top:0px;"></div>
        <div class='shutter-2 fourth' style="left:400px;top:400px;"></div>
        <div class='shutter-1a third' style="left:400px;top:400px;"></div>
        <div class='shutter-3 seventh' style="left:0px;top:0px"></div>
        <div class='shutter second' style="left:400px;top:0px;"></div>
        <div class='shutter-2a sixth' style="left:0px;top:400px;"></div>
        <div class='shutter fifth' style="left:0px;top:400px;"></div>
        <div class='shutter-3a eighth' style="left:0px;top:0px"></div>
    </div>

    //css
        .wrapper {
        position:relative;
          background-image:url('main.jpg');

        width:800px;
        height:800px;
        margin:0px auto;
    }

    .shutter
    {
        position: absolute;
        width: 0; 
        height: 0; 
        width: 0px;
        height: 0px;
        border-left;150px solid transparent;
        border-bottom: 400px solid #e7e7e7;
        text-indent: -9999px;
        border-left-width: 400px;
        border-left-style: solid;
        border-left-color: transparent;
        -webkit-transform:rotate(360deg);
    }

    .shutter-1
    {
        position: absolute;
        width: 0; 
        height: 0; 
        width: 0px;
        height: 0px;
        border-right;150px solid transparent;
        border-top: 400px solid #e7e7e7;
        text-indent: -9999px;
        border-right-width: 400px;
        border-right-style: solid;
        border-right-color: transparent;
        -webkit-transform:rotate(360deg);
    }
    .shutter-1a
    {
        position: absolute;
        width: 0; 
        height: 0; 
        width: 0px;
        height: 0px;
        border-left;150px solid transparent;
        border-top: 400px solid #e7e7e7;
        text-indent: -9999px;
        border-left-width: 400px;
        border-left-style: solid;
        border-left-color: transparent;
        -webkit-transform:rotate(360deg);
    }
    .shutter-2
    {
        position: absolute;
        width: 0; 
        height: 0; 
        width: 0px;
        height: 0px;
        border-right;150px solid transparent;
        border-bottom: 400px solid #e7e7e7;
        text-indent: -9999px;
        border-right-width: 400px;
        border-right-style: solid;
        border-right-color: transparent;
        -webkit-transform:rotate(360deg);
    }
    .shutter-2a
    {
        position: absolute;
        width: 0; 
        height: 0; 
        width: 0px;
        height: 0px;
        border-right;150px solid transparent;
        border-top: 400px solid #e7e7e7;
        text-indent: -9999px;
        border-right-width: 400px;
        border-right-style: solid;
        border-right-color: transparent;
        -webkit-transform:rotate(360deg);
    }
    .shutter-3
    {
        position: absolute;
        width: 0; 
        height: 0; 
        width: 0px;
        height: 0px;
        border-top;150px solid transparent;
        border-left: 400px solid #e7e7e7;
        text-indent: -9999px;
        border-top-width: 400px;
        border-top-style: solid;
        border-top-color: transparent;
        -webkit-transform:rotate(360deg);
    }
    .shutter-3a
    {
        position: absolute;
        width: 0; 
        height: 0; 
        width: 0px;
        height: 0px;
        border-left;150px solid transparent;
        border-top: 400px solid #e7e7e7;
        text-indent: -9999px;
        border-left-width: 400px;
        border-left-style: solid;
        border-left-color: transparent;
        -webkit-transform:rotate(360deg);
    }


    @keyframes first
    {
        from {opacity: 1.0;}
        to {opacity: 0.0;}
    }

    @-moz-keyframes first /* Firefox */
    {
        from {opacity: 1.0;}
        to {opacity: 0.0;}
    }

    @-webkit-keyframes first /* Safari and Chrome */
    {
        from {opacity: 1.0 ;}
        to {opacity: 0.0;}
    }

    @-o-keyframes first /* Opera */
    {
        from {opacity: 1.0;}
        to {opacity: 0.0;}
    }
    .first
    {
        animation: first 1s;
        animation-delay: .08s;
        animation-fill-mode: forwards;
        -moz-animation: first 1s; /* Firefox */
        -moz-animation-delay: .08s;
        -moz-animation-fill-mode: forwards;
        -webkit-animation: first 1s ease-in-out; /* Safari and Chrome */
        -webkit-animation-fill-mode: forwards;
        -webkit-animation-delay: .08s;
        -o-animation: first 1s; /* Opera */
        -o-animation-delay: .08s;
        -o-animation-fill-mode: forwards;
    }
    .second
    {
        animation: first 1s;
        animation-delay: 1.0s;
        animation-fill-mode: forwards;
        -moz-animation: first 1s; /* Firefox */
        -moz-animation-delay: 1s;
        -moz-animation-fill-mode: forwards;
        -webkit-animation: first 1s ease-in-out; /* Safari and Chrome */
        -webkit-animation-fill-mode: forwards;
        -webkit-animation-delay: 1s;
        -o-animation: first 1s; /* Opera */
        -o-animation-delay: 1s;
        -o-animation-fill-mode: forwards;
    }
    .third
    {
        animation: first 1s;
        animation-delay: 1.05s;
        animation-fill-mode: forwards;
        -moz-animation: first 1s; /* Firefox */
        -moz-animation-delay: 1.05s;
        -moz-animation-fill-mode: forwards;
        -webkit-animation: first 1s ease-in-out; /* Safari and Chrome */
        -webkit-animation-delay: 1.05s;
        -webkit-animation-fill-mode: forwards;
        -o-animation: first 1s; /* Opera */
        -o-animation-delay: 1.05s;
        -o-animation-fill-mode: forwards;
    }
    .fourth
    {
        animation: first 1s;
        animation-delay: 1.2s;
        animation-fill-mode: forwards;
        -moz-animation: first 1s; /* Firefox */
        -moz-animation-delay: 1.2s;
        -moz-animation-fill-mode: forwards;
        -webkit-animation: first 1s ease-in-out; /* Safari and Chrome */
        -webkit-animation-delay:1.2s;
        -webkit-animation-fill-mode: forwards;
        -o-animation: first 1s; /* Opera */
        -o-animation-delay: 1.2s;
        -o-animation-fill-mode: forwards;
    }
    .fifth
    {
        animation: first 1s;
        animation-delay: 1.4s;
        animation-fill-mode: forwards;
        -moz-animation: first 1s; /* Firefox */
        -moz-animation-delay: 1.4s;
        -moz-animation-fill-mode: forwards;
        -webkit-animation: first 1s ease-in-out; /* Safari and Chrome */
        -webkit-animation-fill-mode: forwards;
        -webkit-animation-delay: 1.4s;
        -o-animation: first 1s; /* Opera */
        -o-animation-delay: 1.4s;
        -o-animation-fill-mode: forwards;
    }
    .sixth
    {
        animation: first 1s;
        animation-delay: 1.5s;
        animation-fill-mode: forwards;
        -moz-animation: first 1s; /* Firefox */
        -moz-animation-delay: 1.5s;
        -moz-animation-fill-mode: forwards;
        -webkit-animation: first 1s ease-in-out; /* Safari and Chrome */
        -webkit-animation-fill-mode: forwards;
        -webkit-animation-delay: 1.5s;
        -o-animation: first 1s; /* Opera */
        -o-animation-delay: 1.5s;
        -o-animation-fill-mode: forwards;
    }
    .seventh
    {
        animation: first 1s;
        animation-delay: 1.6s;
        animation-fill-mode: forwards;
        -moz-animation: first 1s; /* Firefox */
        -moz-animation-delay: 1.6s;
        -moz-animation-fill-mode: forwards;
        -webkit-animation: first 1s ease-in-out; /* Safari and Chrome */
        -webkit-animation-delay: 1.6s;
        -webkit-animation-fill-mode: forwards;
        -o-animation: first 1s; /* Opera */
        -o-animation-delay: 1.6s;
        -o-animation-fill-mode: forwards;
    }
    .eighth
    {
        animation: first 2s;
        animation-delay: 1.7s;
        animation-fill-mode: forwards;
        -moz-animation: first 2s; /* Firefox */
        -moz-animation-delay: 1.7s;
        -moz-animation-fill-mode: forwards;
        -webkit-animation: first 1s ease-in-out; /* Safari and Chrome */
        -webkit-animation-delay: 1.7s;
        -webkit-animation-fill-mode: forwards;
        -o-animation: first 2s; /* Opera */
        -o-animation-delay: 1.7s;
        -o-animation-fill-mode: forwards;
    }
    .headline {
        font-family: Arial, Helvetica, sans-serif;
        font-weight: 700;
        text-transform: uppercase;
        font-size:36px;
        text-align: center;
        color:#fff;
        padding-top:300px;
        width:300px;
        margin: 0 auto;
    }