recursion - 渲染递归 SVG 文件

Question

是否有可以智能处理递归(即自引用)svg 文件的现有渲染器？

例如，来自 this question 的代码:

<svg width="100%" height="100%" viewBox="-100 -100 200 200" version="1.1"
     xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink">
  <circle cx="-50" cy="-50" r="30" style="fill:red" />
  <image x="10" y="20" width="80" height="80" xlink:href="recursion.svg" />
</svg>

未在 Firefox、Chrome 或 Inkscape 中正确呈现 - 但似乎并非如此
很难制作一个渲染器来跟踪它打开特定文件的次数，并在经过一定次数的迭代后停止......

(如果一个不存在，如果我想自己编写一个代码，我可以去哪里寻找？)

Answer 1

您可以重复引用一个定义。虽然这不是无限递归，但它比其他答案/评论中引用的嵌套方法简单得多。

请参阅我发现的 Dudley Storey 的这些示例( Example 1 、 Example 2 ):

svg {
display: block;
width: 40%;
margin: 0 auto;
}
polygon, line { 
fill: none; stroke: #32679D; 
stroke-width: 5px; 
vector-effect: non-scaling-stroke;
}

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 750 750">
<defs>
	<g id="hex" transform="rotate(30 375 375)">
		<polygon points="229.3,627.5 83.6,375.5 229.3,123.5 520.7,123.5 666.4,375.5 520.7,627.5" />
		<line x1="229.3" y1="123.5" x2="520.7" y2="627.5"/>
		<line x1="666" y1="375.5" x2="84" y2="375.5"/>
		<line x1="520.7" y1="123.5" x2="229.3" y2="627.5"/>
	</g>
</defs>	
<use xlink:href="#hex" />
<use xlink:href="#hex" transform="translate(470.75, 172) scale(.25)" />
<use xlink:href="#hex" transform="translate(470.75, 390.5) scale(.25)" />
<use xlink:href="#hex" transform="translate(91.75, 172) scale(.25)" /> 
<use xlink:href="#hex" transform="translate(91.75, 390.5) scale(.25)" /> 	
<use xlink:href="#hex" transform="translate(155, 281.25) scale(.25)" />
<use xlink:href="#hex" transform="translate(407.5, 281.25) scale(.25)" />
<use xlink:href="#hex" transform="translate(281.25, 63.5) scale(.25)" />
<use xlink:href="#hex" transform="translate(281.25, 500) scale(.25)" />
<use xlink:href="#hex" transform="translate(344.5, 172) scale(.25)" />
<use xlink:href="#hex" transform="translate(218, 172) scale(.25)" />
<use xlink:href="#hex" transform="translate(344.5, 390.5) scale(.25)" />
<use xlink:href="#hex" transform="translate(218, 390.5) scale(.25)" />
</svg>

嵌套可能会变得更复杂:

body {
margin: 0;
min-height: 100vh;
background: #fff;
}
svg {
display: block;
width: 100%;
min-height: 100vh;
}
polygon { 
fill: none; 
stroke: rgba(0,0,0,0.3); 
stroke-width: 3; 
}

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<defs>
	<pattern id="tesselation" patternUnits="userSpaceOnUse" width="562.6" height="325" patternTransform="scale(.75)">
	<g id="group">
		<polygon points="281.4,0 375.2, 162.5 281.4, 325 187, 161.5" id="base" />
		<g id="basetwist" >
			<use xlink:href="#base" transform="rotate(90 280 162.5) translate(116, 67) scale(.58)" id="base_level1" />
			<g id="diamond"> 
				<use xlink:href="#base" transform="translate(188.85, 108) scale(.33)" id="base_level2" />
				<g id="sidediamond">
					<use xlink:href="#base_level1" transform="translate(188.85, 108) scale(.33)" id="base_level3" />
						<use xlink:href="#base_level2" transform="translate(188.85, 108) scale(.33)" id="base_level4" />
							<use xlink:href="#base_level3" transform="translate(188.85, 108) scale(.33)" /> 
								<use xlink:href="#base_level4" transform="translate(188.85, 108) scale(.33)" />
				</g>
			</g>
			<use xlink:href="#sidediamond" transform="translate(62,0)" />
			<use xlink:href="#sidediamond" transform="translate(-62,0)" />
			<use xlink:href="#diamond" transform="translate(0,-107)" />
			<use xlink:href="#diamond" transform="translate(0, 107)" />
		</g>
	</g>
	<g id="tesselation">
		<use xlink:href="#group" />
		<use xlink:href="#group" transform="rotate(60 281 0)" />
		<use xlink:href="#group" transform="rotate(-60 281 0)" />
		<use xlink:href="#group" transform="rotate(-60 281 325)" />
		<use xlink:href="#group" transform="rotate(60 281 325)" />
		<g id="vert">
			<use xlink:href="#group" transform="translate(-282, -162)" />
			<use xlink:href="#group" transform="translate(-282, 162)" />
		</g>
		<use xlink:href="#vert" transform="translate(564, 0)" />
	</g>
	</pattern>
</defs>
<rect width="100%" height="100%" fill="url(#tesselation)" />	
</svg>

编辑:他的博客文章描述了他如何创建它们:

https://thenewcode.com/1141/Recursive-SVG-Designs-Part-1

https://thenewcode.com/1147/Recursive-SVG-Patterns-Part-2