< filter>的巨大高度值不阻止截止 [英] Humongous height value for <filter> not preventing cutoff

问题描述

我正在尝试在<path>上应用<filter>，但是我遇到了裁剪对象的问题，不仅是模糊，而且还有原始图像的某些部分(即标记).

I am trying to apply a <filter> on a <path> but I am having problems with things being clipped, not just the blur but also parts of original image, namely the markers.

所以我尝试增加默认滤镜高度(为120%)，但似乎无济于事.

So I tried increasing the default filter height (which is 120%) but it did not seem to help.

<svg style="height:400px;width:100%;background-color:LightCyan">

<defs>
  <filter id="colorFilter" height="999%">
    <feGaussianBlur in="SourceAlpha" stdDeviation="1" result="blur"></feGaussianBlur>
    <feColorMatrix type="matrix" values="0 0 0 0 0 0 0 0 0 255 0 0 0 0 0 0 0 0 3 0" result="lightenedBlur"></feColorMatrix>
    <feMerge>
      <feMergeNode in="lightenedBlur"></feMergeNode>
      <feMergeNode in="SourceGraphic"></feMergeNode>
    </feMerge>
  </filter>
  <marker id="arrow" viewBox="0 -5 10 10" refX="0" refY="0" markerWidth="8" markerHeight="8" orient="auto" style="fill: grey;">
    <path d="M0,-5L10,0L0,5"></path>
  </marker>
</defs>

<g transform="scale(2)">

  <g transform="translate(-500,-230)">
    <path stroke="grey" fill="none" marker-end="url(#arrow)" d="M555,274L657.4632873535149,274L657.4632873535149,271.03831481933645L759.92657470703,271.03831481933645"></path>
  </g>

  <g transform="translate(-500,-200)" filter="url(#colorFilter)">
    <path stroke="grey" fill="none" marker-end="url(#arrow)" d="M555,274L657.4632873535149,274L657.4632873535149,271.03831481933645L759.92657470703,271.03831481933645"></path>
  </g>

  <g transform="translate(-500,-120)" filter="url(#colorFilter)">
    <path stroke="grey" fill="none" marker-end="url(#arrow)" d="M555,274L657.6947631835931,274L657.6947631835931,222.58172607421926L760.3895263671862,222.58172607421926"></path>
  </g>

</g>

</svg>

现在<g>的跨度足以包围它的所有子项，这意味着对于顶部箭头而言，高度并不是很高，因此我尝试为但这都不起作用:

Now the <g> spans as much as is necessary to surround all its children, which means that for the top arrow the height isn't very much to begin with so I tried using absolute instead of relative values for the height but that does not help either:

<svg style="height:300px;width:100%;background-color:LightCyan">

<defs>
  <filter id="colorFilter" height="1234">
    <feGaussianBlur in="SourceAlpha" stdDeviation="1" result="blur"></feGaussianBlur>
    <feColorMatrix type="matrix" values="0 0 0 0 0 0 0 0 0 255 0 0 0 0 0 0 0 0 3 0" result="lightenedBlur"></feColorMatrix>
    <feMerge>
      <feMergeNode in="lightenedBlur"></feMergeNode>
      <feMergeNode in="SourceGraphic"></feMergeNode>
    </feMerge>
  </filter>
  <marker id="arrow" viewBox="0 -5 10 10" refX="0" refY="0" markerWidth="8" markerHeight="8" orient="auto" style="fill: grey;">
    <path d="M0,-5L10,0L0,5"></path>
  </marker>
</defs>

<g transform="scale(2)">

  <g transform="translate(-500,-230)" filter="url(#colorFilter)">
    <path stroke="grey" fill="none" marker-end="url(#arrow)" d="M555,274L657.4632873535149,274L657.4632873535149,271.03831481933645L759.92657470703,271.03831481933645"></path>
  </g>

  <g transform="translate(-500,-150)" filter="url(#colorFilter)">
    <path stroke="grey" fill="none" marker-end="url(#arrow)" d="M555,274L657.6947631835931,274L657.6947631835931,222.58172607421926L760.3895263671862,222.58172607421926"></path>
  </g>

</g>

</svg>

任何想法都可能导致这种剪裁，对此可以采取什么措施?为什么在特定点以上的height属性值在这里不起作用?

Any idea what might cause this clipping and what can be done about it? Why do height attribute values above a certain point have not effect here?

(在Chrome，Firefox和Edge中复制-看起来不像是浏览器错误.)

(Reproduced in Chrome, Firefox and Edge – does not look like a browser bug.)

推荐答案

您还必须移动滤镜效果区域的上边框.默认值为y=-10%.

You have to move the upper border of the filter effect region as well. Default is y=-10%.

<svg style="height:400px;width:100%;background-color:LightCyan">

<defs>
  <filter id="colorFilter" y="-200%" height="500%">
    <feGaussianBlur in="SourceAlpha" stdDeviation="1" result="blur"></feGaussianBlur>
    <feColorMatrix type="matrix" values="0 0 0 0 0 0 0 0 0 255 0 0 0 0 0 0 0 0 3 0" result="lightenedBlur"></feColorMatrix>
    <feMerge>
      <feMergeNode in="lightenedBlur"></feMergeNode>
      <feMergeNode in="SourceGraphic"></feMergeNode>
    </feMerge>
  </filter>
  <marker id="arrow" viewBox="0 -5 10 10" refX="0" refY="0" markerWidth="8" markerHeight="8" orient="auto" style="fill: grey;">
    <path d="M0,-5L10,0L0,5"></path>
  </marker>
</defs>

<g transform="scale(2)">

  <g transform="translate(-500,-230)">
    <path stroke="grey" fill="none" marker-end="url(#arrow)" d="M555,274L657.4632873535149,274L657.4632873535149,271.03831481933645L759.92657470703,271.03831481933645"></path>
  </g>

  <g transform="translate(-500,-200)" filter="url(#colorFilter)">
    <path stroke="grey" fill="none" marker-end="url(#arrow)" d="M555,274L657.4632873535149,274L657.4632873535149,271.03831481933645L759.92657470703,271.03831481933645"></path>
  </g>

  <g transform="translate(-500,-120)" filter="url(#colorFilter)">
    <path stroke="grey" fill="none" marker-end="url(#arrow)" d="M555,274L657.6947631835931,274L657.6947631835931,222.58172607421926L760.3895263671862,222.58172607421926"></path>
  </g>

</g>

</svg>

顺便说一句，仅当设置filterUnits="userSpaceOnUse"时，才使用绝对值.有关使用y值的相同说明也适用.

As an aside, using absolute values only works if you set filterUnits="userSpaceOnUse". The same note on the use of y values applies.

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