我在 svg 中有一个围绕给定点旋转的圆圈。我又加了一个圈。我想围绕第一个旋转圆旋转第二个圆。我怎样才能做到这一点？到目前为止，我能够围绕一个点旋转第一个圆。第二个圆圈正在旋转，但不围绕第一个旋转。我正在分享我的代码：
firstCircle= document.createElementNS(namespace, "circle");
firstCircle.setAttributeNS(null, "id", "firstCircle");
firstCircle.setAttributeNS(null, "cx", 700);
firstCircle.setAttributeNS(null, "cy", 400);
firstCircle.setAttributeNS(null, "r", 30);
firstCircle.setAttributeNS(null, "fill", "#0077BE");
svg.appendChild(firstCircle);
firstCircleAnimate = document.createElementNS(namespace, "animateTransform");
firstCircleAnimate.setAttributeNS(null, "attributeName", "transform");
firstCircleAnimate.setAttributeNS(null, "type", "rotate");
firstCircleAnimate.setAttributeNS(null, "from", "0 400 400");
firstCircleAnimate.setAttributeNS(null, "to", "360 400 400");
firstCircleAnimate.setAttributeNS(null, "begin", "0s");
firstCircleAnimate.setAttributeNS(null, "dur", "5s");
firstCircleAnimate.setAttributeNS(null, "repeatCount", "indefinite");
firstCircle.appendChild(firstCircleAnimate);
secondCircle= document.createElementNS(namespace, "circle");
secondCircle.setAttributeNS(null, "id", "secondCircle");
secondCircle.setAttributeNS(null, "cx", 760);
secondCircle.setAttributeNS(null, "cy", 400);
secondCircle.setAttributeNS(null, "r", 10);
secondCircle.setAttributeNS(null, "fill", "#D0D5D2");
svg.appendChild(secondCircle);
secondCircleAnimate = document.createElementNS(namespace, "animateTransform");
secondCircleAnimate.setAttributeNS(null, "attributeName", "transform");
secondCircleAnimate.setAttributeNS(null, "type", "rotate");
secondCircleAnimate.setAttributeNS(null, "from", "0 " + firstCircle.getAttributeNS(null, "cx") + " " + firstCircle.getAttributeNS(null, "cy"));
secondCircleAnimate.setAttributeNS(null, "to", "360 " + firstCircle.getAttributeNS(null, "cx") + " " + firstCircle.getAttributeNS(null, "cy"));
secondCircleAnimate.setAttributeNS(null, "begin", "0s");
secondCircleAnimate.setAttributeNS(null, "dur", "2s");
secondCircleAnimate.setAttributeNS(null, "repeatCount", "indefinite");
secondCircle.appendChild(secondCircleAnimate );
在这里，我将secondCircleAnimatefrom 和 to 属性设置为firstCircle的中心坐标，但第一个圆本身是旋转的，在 DOM 中，第一个圆的中心似乎在整个旋转过程中都没有改变。那么如何围绕旋转的第一个圆圈旋转第二个圆圈？
提前致谢。
终于找到了解决办法。我<g>在第二个圆圈周围添加了一个标签。我添加了相同animateTransform的<g>并使其围绕中心点和内部旋转<g>，对于第二个圆，我使第二个圆围绕第一个圆旋转。
重要的是第一圈的持续时间和第二圈的持续时间应该相等（只是为了使它们的旋转同步）。
添加的代码是：
group= document.createElementNS(namespace, "g");
group.setAttributeNS(null, "id", "group");
svg.appendChild(group);
groupAnimate= document.createElementNS(namespace, "animateTransform");
groupAnimate.setAttributeNS(null, "attributeName", "transform");
groupAnimate.setAttributeNS(null, "type", "rotate");
groupAnimate.setAttributeNS(null, "from", "0 400 400");
groupAnimate.setAttributeNS(null, "to", "360 400 400");
groupAnimate.setAttributeNS(null, "begin", "0s");
groupAnimate.setAttributeNS(null, "dur", "5s");
groupAnimate.setAttributeNS(null, "repeatCount", "indefinite");
group.appendChild(groupAnimate);
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我来说两句