SVG 中的固定笔画宽度 [英] Fixed stroke width in SVG

问题描述

我希望能够将 SVG 元素上的笔触宽度设置为像素感知"，无论当前应用的缩放转换如何，它始终为 1px 宽.我知道这很可能是不可能的，因为 SVG 的全部意义在于与像素无关.

I would like to be able to set the stroke-width on an SVG element to be "pixel-aware", that is always be 1px wide regardless of the current scaling transformations applied. I am aware that this may well be impossible, since the whole point of SVG is to be pixel independent.

上下文如下:

我有一个 SVG 元素，它设置了 viewBox 和 preserveAspectRatio 属性.看起来像这样

I have an SVG element with its viewBox and preserveAspectRatio attributes set. It looks something like this

<svg version="1.1" baseProfile="full"
    viewBox="-100 -100 200 200" preserveAspectRatio="xMidYMid meet"
    xmlns="http://www.w3.org/2000/svg" >
</svg>

这意味着当我缩放该元素时，它内部的实际形状会相应地缩放(到目前为止效果很好).

This means that when I scale that element, the actual shapes inside it scale accordingly (so far so good).

如您所见，我已经设置了 viewBox，使原点位于中心.我想在该元素内绘制一个 x 轴和一个 y 轴，我这样做:

As you can see, I have set up the viewBox so that the origin is in the center. I would like to draw an x- and a y-axis within that element, which I do thus:

<line x1="-1000" x2="1000" y1="0" y2="0" />

同样，这很好用.但是，理想情况下，该轴始终只有 1px 宽.当我缩放父 svg 元素时，我对轴变粗不感兴趣.

Again, this works fine. Ideally, though, this axis would always be only 1px wide. I have no interest in the axes getting fatter when i scale the parent svg element.

那我是不是搞砸了?

推荐答案

您可以使用 vector-effect 属性设置为 non-scaling-stroke，参见 文档.另一种方法是使用 transform(ref).

You can use the vector-effect property set to non-scaling-stroke, see the docs. Another way is to use transform(ref).

这将适用于支持 SVG Tiny 1.2 中那些部分的浏览器，例如 Opera 10.回退包括编写一个小脚本来执行相同的操作，基本上反转 CTM 并将其应用于不应缩放的元素.

That will work in browsers that support those parts from SVG Tiny 1.2, for example Opera 10. The fallback includes writing a small script to do the same, basically inverting the CTM and applying it on the elements that shouldn't scale.

如果您想要更清晰的线条，您还可以禁用抗锯齿(shape-rendering=optimizeSpeed 或 shape-rendering=crispEdges) 和/或玩定位.

If you want sharper lines you can also disable antialiasing (shape-rendering=optimizeSpeed or shape-rendering=crispEdges) and/or play with the positioning.

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