我怎样才能创造一个“发光"?围绕一个带有 svg 的矩形? [英] How can I create a "glow" around a rectangle with svg?

问题描述

我有类似以下内容:

<svg id="svgLogo1" style="left:0; top:0; position:absolute"
        width="980" height="80" viewBox="0 0 980 80" 
        xmlns="http://www.w3.org/2000/svg">
    <rect x="0" y="5" width="980" height="54" rx="6" ry="6" 
            style="stroke-width:2; xstroke:#FFF; fill:#555"/>
</svg>

我想在这个周围创造一个白色的光芒.

I would like to create a white glow around this.

有什么方法可以在 svg 中做到这一点.我环顾四周，我能找到的只是阴影"，这并不是我真正想要的，因为我想要矩形的所有四个边周围都有阴影(发光).

Is there some way that I can do this in svg. I looked around and all I can find is "shadow" which is not really what I am looking for as I want a shadow (Glow) around all four sides of the rectangle.

推荐答案

以下是一些提供不同类型效果的过滤器:

Here are some filters that provide different types of effect:

• 阴影(带有轻微偏移的透明黑色阴影)
• 黑色发光(具有固定颜色)
• 物体颜色的发光(采用它所应用的物体的颜色)

示例:

这里有一个演示.

代码:

<!-- a transparent grey drop-shadow that blends with the background colour -->
<filter id="shadow" width="1.5" height="1.5" x="-.25" y="-.25">
    <feGaussianBlur in="SourceAlpha" stdDeviation="2.5" result="blur"/>
    <feColorMatrix result="bluralpha" type="matrix" values=
            "1 0 0 0   0
             0 1 0 0   0
             0 0 1 0   0
             0 0 0 0.4 0 "/>
    <feOffset in="bluralpha" dx="3" dy="3" result="offsetBlur"/>
    <feMerge>
        <feMergeNode in="offsetBlur"/>
        <feMergeNode in="SourceGraphic"/>
    </feMerge>
</filter>

<!-- a transparent grey glow with no offset -->
<filter id="black-glow">
    <feColorMatrix type="matrix" values=
                "0 0 0 0   0
                 0 0 0 0   0
                 0 0 0 0   0
                 0 0 0 0.7 0"/>
    <feGaussianBlur stdDeviation="2.5" result="coloredBlur"/>
    <feMerge>
        <feMergeNode in="coloredBlur"/>
        <feMergeNode in="SourceGraphic"/>
    </feMerge>
</filter>

<!-- a transparent glow that takes on the colour of the object it's applied to -->
<filter id="glow">
    <feGaussianBlur stdDeviation="2.5" result="coloredBlur"/>
    <feMerge>
        <feMergeNode in="coloredBlur"/>
        <feMergeNode in="SourceGraphic"/>
    </feMerge>
</filter>

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