javascript - 望实现矩形径向删除动画显示

Question

我正在制作一个全 Angular 英雄动画，它将以径向删除方式显示图像/HTML div。这是我到目前为止所拥有的: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/ - 我遇到的问题是图像平铺，因为动画将“馅饼”分成两半 - 我希望在没有图像平铺的情况下执行效果。我不反对 Javascript 解决方案。谢谢。

//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

这就是我的解决方案。

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;
}

最复杂的问题是将拆分后的左侧元素重新用于右侧开头。 我必须将容器移动到动画中间的左侧。 背景图设置了封面，所有的尺寸都是百分比，所以这个方案应该是完全响应式的

fiddle

该演示的迭代次数为无限，因此更容易看到它的进行情况。