How to Rotate Clip Path without rotating image?

问题

I have an image with CSS property clip-path. I have added animation to rotate the clip path. I want to only rotate clip-path, not the image. From below code, you can get an idea of what I want to achieve. I did this to give you an idea of what I want to achieve. The problem with my code is that it takes a lot of time of manually set clip-path points on each keyframe. So Is there any short method to achieve the below code result without changing the points manually on keyframes? I want it to be smooth, which is pretty hard to set with manually setting the points. (Keep in mind, I don't need that last animation which makes the image invisible, I am unable to figure out why it's happening.

#profile-img {
    width: 15%;
    margin: 5%;
    -webkit-clip-path: polygon(20% 0%, 0% 20%, 30% 50%, 0% 80%, 20% 100%, 50% 70%, 80% 100%, 100% 80%, 70% 50%, 100% 20%, 80% 0%, 50% 30%);
    clip-path: polygon(20% 0%, 0% 20%, 30% 50%, 0% 80%, 20% 100%, 50% 70%, 80% 100%, 100% 80%, 70% 50%, 100% 20%, 80% 0%, 50% 30%);
    animation: clipRotateAnim 2s linear infinite;
}

@keyframes clipRotateAnim {
    0% {
        -webkit-clip-path: polygon(20% 0%, 0% 20%, 30% 50%, 0% 80%, 20% 100%, 50% 70%, 80% 100%, 100% 80%, 70% 50%, 100% 20%, 80% 0%, 50% 30%);
        clip-path: polygon(20% 0%, 0% 20%, 30% 50%, 0% 80%, 20% 100%, 50% 70%, 80% 100%, 100% 80%, 70% 50%, 100% 20%, 80% 0%, 50% 30%);
    }
    
    25% {
        -webkit-clip-path: polygon(100% 23%, 80% 0, 47% 34%, 16% 0, 0 19%, 26% 53%, 0 78%, 19% 100%, 51% 71%, 76% 100%, 100% 81%, 68% 51%);
        clip-path: polygon(100% 23%, 80% 0, 47% 34%, 16% 0, 0 19%, 26% 53%, 0 78%, 19% 100%, 51% 71%, 76% 100%, 100% 81%, 68% 51%);
    }
    50% {
        -webkit-clip-path: polygon(84% 100%, 100% 75%, 64% 56%, 100% 13%, 81% 0, 49% 28%, 22% 0, 0 29%, 28% 57%, 0 83%, 21% 100%, 42% 74%);
        clip-path: polygon(84% 100%, 100% 75%, 64% 56%, 100% 13%, 81% 0, 49% 28%, 22% 0, 0 29%, 28% 57%, 0 83%, 21% 100%, 42% 74%);
    }
    100% {
        -webkit-clip-path: polygon(27% 0, 0 19%, 29% 49%, 0 79%, 19% 100%, 45% 76%, 84% 100%, 100% 80%, 69% 56%, 100% 18%, 80% 0, 47% 33%);
        clip-path: polygon(27% 0, 0 19%, 29% 49%, 0 79%, 19% 100%, 45% 76%, 84% 100%, 100% 80%, 69% 56%, 100% 18%, 80% 0, 47% 33%);

    }
 
}

<img id="profile-img" src="https://images.pexels.com/photos/1025804/pexels-photo-1025804.jpeg?auto=compress&cs=tinysrgb&h=350">

回答1:

Use the image as a background of a pseudo element and rotate it in the opposite direction:

.image {
    width:200px;
    height:200px;
    margin: 20px;
    -webkit-clip-path: polygon(20% 0%, 0% 20%, 30% 50%, 0% 80%, 20% 100%, 50% 70%, 80% 100%, 100% 80%, 70% 50%, 100% 20%, 80% 0%, 50% 30%);
    clip-path: polygon(20% 0%, 0% 20%, 30% 50%, 0% 80%, 20% 100%, 50% 70%, 80% 100%, 100% 80%, 70% 50%, 100% 20%, 80% 0%, 50% 30%);
    animation: clipRotateAnim 2s linear infinite;
    position:relative;
    overflow:hidden;
}
.image:before {
  content:"";
  position:absolute;
  top:-10%;
  bottom:-10%;
  left:-10%;
  right:-10%;
  background:var(--i) center/cover;
  animation: clipRotateAnim 2s linear infinite reverse;
}
@keyframes clipRotateAnim{
  from{transform:rotate(0)}
  to{transform:rotate(360deg)}
}

<div class="image"  style="--i:url(https://images.pexels.com/photos/1025804/pexels-photo-1025804.jpeg?auto=compress&cs=tinysrgb&h=350)">
</div>

Another idea to avoid clip-path is to use background to create another layer above the image that you rotate. In this case you will not have the transparency but you will have better browser support.

.image {
    width:200px;
    height:200px;
    margin: 20px;
    position:relative;
   background:var(--i) center/cover;
   overflow:hidden;
}
.image:before {
  content:"";
  position:absolute;
  top:0;
  bottom:0;
  left:0;
  right:0;
  box-shadow:0 0 200px 200px #fff;
  background-image:
    linear-gradient(#fff,#fff),linear-gradient(#fff,#fff),linear-gradient(#fff,#fff),linear-gradient(#fff,#fff);
  background-size:calc(50% - 30px) calc(50% - 30px);
  background-position:top left,top right,bottom left,bottom right;
  background-repeat:no-repeat;
  animation: clipRotateAnim 2s linear infinite;
}
@keyframes clipRotateAnim{
  from{transform:rotate(0)}
  to{transform:rotate(360deg)}
}

<div class="image"  style="--i:url(https://images.pexels.com/photos/1025804/pexels-photo-1025804.jpeg?auto=compress&cs=tinysrgb&h=350)">
  
</div>

来源：https://stackoverflow.com/questions/51010556/how-to-rotate-clip-path-without-rotating-image