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我必须编写一个代码，圆圈应该在SVG下面的一些路径下

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https://codepen.io/lzwdct/pen/poRYVXZ

想象一下路径就像车道，而圆圈在路径（如桥）下方经过，它不应该出现在桥下。

有没有办法实现它？

4

1 回答 1

3

SVG 遮罩的工作方式有点奇怪。它所应用的元素只会在遮罩为白色的地方渲染，而在遮罩为黑色（或只是不是白色）的地方，它将被隐藏。SVG 蒙版的另一个奇怪效果是，如果您正在为元素设置动画并将蒙版应用于正在设置动画的元素，则蒙版将随元素一起移动。

为了说明第一部分很简单，只需在蒙版内添加一个与 SVG 本身大小相同的白色矩形，并使用较小的黑色形状进行蒙版。解决移动遮罩的方法是将遮罩应用到动画元素而不是<g>包裹动画元素的标签上。

但是，如果您希望圆圈“在”某个部分“下方”然后“在”同一部分“上方”，那么您还需要在蒙版内进行一些动画处理。在此示例中，我animateTransform在蒙版的 rect 子项（进行蒙版的黑色部分）内部使用以在圆圈通过“桥下”后将其缩小，但您也可以轻松地使用 CSS 关键帧。

我强烈建议您也减少视图框，因为与可用空间相比，您的视觉元素非常小，在我刚刚估计的示例中，但最好的方法是在 Illustrator 中重新渲染您的图形并更好地将画板裁剪为您的对象.

此外，如果 SVG 将内联在 HTML 中，则不需要 Illustrator 生成的大多数附加标记。除了我的示例中显示的 viewBox 之外，您几乎可以丢失所有内容，因为这些其他属性大多仅在 SVG 呈现为图像时使用，希望这会有所帮助。

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于 2021-05-03T06:14:57.450 回答