Question

我想仅使用 CSS 围绕大圆的圆周移动一个小圆。

@keyframes moveAround {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

#small {
  animation: moveAround 2s infinite linear;
}

<svg width="120" height="100" viewBox="0 0 120 100" fill="none" xmlns="http://www.w3.org/2000/svg">
    <g id="circles">
      <circle id="big" cx="60" cy="50" r="30" fill="white" stroke="#2493AB" stroke-width="20" />
      <circle id="small" cx="60" cy="20" r="10" fill="#EF6868" />
    </g>
  </svg>

Answer 1

您必须指定圆应围绕哪个坐标旋转。默认情况下，这是坐标 0,0，但您希望它绕大圆的中心运行。

在 CSS 中，您可以使用 transform-origin：

#small {
    transform-origin: 60px 50px;
    animation: moveAround 2s infinite linear;
}
@keyframes moveAround {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

<svg width="120" height="100" viewBox="0 0 120 100" fill="none" xmlns="http://www.w3.org/2000/svg">
    <g id="circles">
        <circle id="big" cx="60" cy="50" r="30" fill="white" stroke="#2493AB" stroke-width="20" />
        <circle id="small" cx="60" cy="20" r="10" fill="#EF6868" />
    </g>
</svg>

Answer 2

没有 SVG 的纯 CSS 解决方案

.box {
  width: 60px;
  height: 60px;
  border: 20px solid #2493AB;
  border-radius: 50%;
  position: relative;
}

.box::before {
  content: "";
  width: 20px;
  height: 20px;
  border-radius: 50%;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  background: #EF6868;
  animation: moveAround 3s linear infinite;
}

@keyframes moveAround {
  from {
    transform: rotate(0deg) translate(40px);
  }
  to {
    transform: rotate(360deg) translate(40px);
  }
}

<div class="box"></div>

Answer 3

纯 SMIL SVG 解决方案

要旋转球，请使用 animateTransform

<svg width="120" height="100" viewBox="0 0 120 100" fill="none" xmlns="http://www.w3.org/2000/svg">
    <g id="circles">
      <circle id="big" cx="60" cy="50" r="30" fill="white" stroke="#2493AB" stroke-width="20" />
      <circle id="small" cx="60" cy="20" r="10" fill="#EF6868" >
       <animateTransform
         attributeName="transform"
         type="rotate"
         begin="0s"
         dur="3s"
         values="
           0 60 50;
           360 60 50"
          repeatCount="indefinite" /> 
      </circle>
    </g>
  </svg>

在完整旋转之间暂停的球旋转

<svg width="120" height="100" viewBox="0 0 120 100" fill="none" xmlns="http://www.w3.org/2000/svg">
    <g id="circles">
      <circle id="big" cx="60" cy="50" r="30" fill="white" stroke="#2493AB" stroke-width="20" />
      <circle id="small" cx="60" cy="20" r="10" fill="#EF6868" >
       <animateTransform id="an"
         attributeName="transform"
         type="rotate"
         begin="0s;an.end+1s"
         dur="2s"
         values="
           0 60 50;
           360 60 50"
           /> 
      </circle>
    </g>
  </svg>

前后旋转

<svg width="120" height="100" viewBox="0 0 120 100" fill="none" xmlns="http://www.w3.org/2000/svg">
    <g id="circles">
      <circle id="big" cx="60" cy="50" r="30" fill="white" stroke="#2493AB" stroke-width="20" />
      <circle id="small" cx="60" cy="20" r="10" fill="#EF6868" >
       <animateTransform
         attributeName="transform"
         type="rotate"
         begin="0s"
         dur="4s"
         values="
           0 60 50;
           360 60 50;
           360 60 50;
           0 60 50;
           0 60 50"
          repeatCount="indefinite" /> 
      </circle>
    </g>
  </svg>

Answer 4

单个 div 的另一个想法。

.circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  position: relative;
  background: radial-gradient(#EF6868 0 9.5px, transparent 10.5px) 50% 0% / 20px 20px no-repeat, 
              radial-gradient(transparent 29px, #2493AB 30px 50px) 0 0 / 100% 100% no-repeat;
  animation: animate 3s linear infinite;
}


@keyframes animate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

<div class="circle"></div>

围绕另一个大圆的圆周动画一个圆

4 个答案: