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在SVG中创建发光效果是否可行？

htmlcsssvg
10
我正在学习SVG，想知道是否可以通过SVG以交互方式创建以下示例中的发光效果，即触发悬停效果：https://codepen.io/FelixRilling/pen/qzfoc。
事实上，我在想如何让光线来来去去，使用SVG的好处是可以更精确地跟踪形状，这样就能得到更好的效果。是否可能使用SVG实现这个效果？
接下来是HTML CSS代码：
<div id="container">

    <p><a href="https://en.wikipedia.org/wiki/Red">
        RED
    </a></p>

    <p><a href="https://en.wikipedia.org/wiki/Blue">
        BLUE
    </a></p>

    <p><a href="https://en.wikipedia.org/wiki/Yellow">
        Yellow
    </a></p>

    <p><a href="https://en.wikipedia.org/wiki/Green">
        GREEN
    </a></p>

    <p><a href="https://en.wikipedia.org/wiki/Orange_(colour)">
        ORANGE
    </a></p>

    <p><a href="https://en.wikipedia.org/wiki/Violet_(color)">
        VIOLET
    </a></p>

</div>

<div id="linkBack" style="position:absolute;right:0px;top:0px;background-color:#333;margin:0;width:60px;padding:5px"><a href="http://www.f-rilling.com/projects/" target="_blank" style="font-size:14px;text-decoration:none;color:#fff;padding:0 0 0 5px;font-family:sans-serif">My Site</a></div>

CSS（层叠样式表）：
body {
  background-color: #222222;
  background: repeating-linear-gradient(45deg, #2b2b2b 0%, #2b2b2b 10%, #222222 0%, #222222 50%) 0 / 15px 15px;
}

#container {
  width: 500px;
  margin: auto;
}

/*Neon*/
p {
  text-align: center;
  font-size: 7em;
  margin: 20px 0 20px 0;
}

a {
  text-decoration: none;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  transition: all 0.5s;
}

p:nth-child(1) a {
  color: #fff;
  font-family: Monoton;
  -webkit-animation: neon1 1.5s ease-in-out infinite alternate;
  -moz-animation: neon1 1.5s ease-in-out infinite alternate;
  animation: neon1 1.5s ease-in-out infinite alternate;
}

p:nth-child(1) a:hover {
  color: #FF1177;
  -webkit-animation: none;
  -moz-animation: none;
  animation: none;
}

p:nth-child(2) a {
  font-size: 1.5em;
  color: #228DFF;
  font-family: Iceland;
}

p:nth-child(2) a:hover {
  -webkit-animation: neon2 1.5s ease-in-out infinite alternate;
  -moz-animation: neon2 1.5s ease-in-out infinite alternate;
  animation: neon2 1.5s ease-in-out infinite alternate;
}

p:nth-child(3) a {
  color: #FFDD1B;
  font-family: Pacifico;
}

p:nth-child(3) a:hover {
  -webkit-animation: neon3 1.5s ease-in-out infinite alternate;
  -moz-animation: neon3 1.5s ease-in-out infinite alternate;
  animation: neon3 1.5s ease-in-out infinite alternate;
}

p:nth-child(4) a {
  color: #B6FF00;
  font-family: "Press Start 2P";
  font-size: 0.8em;
}

p:nth-child(4) a:hover {
  -webkit-animation: neon4 1.5s ease-in-out infinite alternate;
  -moz-animation: neon4 1.5s ease-in-out infinite alternate;
  animation: neon4 1.5s ease-in-out infinite alternate;
}

p:nth-child(5) a {
  color: #FF9900;
  font-family: Audiowide;
}

p:nth-child(5) a:hover {
  -webkit-animation: neon5 1.5s ease-in-out infinite alternate;
  -moz-animation: neon5 1.5s ease-in-out infinite alternate;
  animation: neon5 1.5s ease-in-out infinite alternate;
}

p:nth-child(6) a {
  color: #BA01FF;
  font-family: Vampiro One;
}

p:nth-child(6) a:hover {
  -webkit-animation: neon6 1.5s ease-in-out infinite alternate;
  -moz-animation: neon6 1.5s ease-in-out infinite alternate;
  animation: neon6 1.5s ease-in-out infinite alternate;
}

p a:hover {
  color: #ffffff;
}
/*glow for webkit*/

@-webkit-keyframes neon1 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #FF1177, 0 0 70px #FF1177, 0 0 80px #FF1177, 0 0 100px #FF1177, 0 0 150px #FF1177;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #FF1177, 0 0 35px #FF1177, 0 0 40px #FF1177, 0 0 50px #FF1177, 0 0 75px #FF1177;
  }
}

@-webkit-keyframes neon2 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #228DFF, 0 0 70px #228DFF, 0 0 80px #228DFF, 0 0 100px #228DFF, 0 0 150px #228DFF;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #228DFF, 0 0 35px #228DFF, 0 0 40px #228DFF, 0 0 50px #228DFF, 0 0 75px #228DFF;
  }
}

@-webkit-keyframes neon3 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #FFDD1B, 0 0 70px #FFDD1B, 0 0 80px #FFDD1B, 0 0 100px #FFDD1B, 0 0 150px #FFDD1B;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #FFDD1B, 0 0 35px #FFDD1B, 0 0 40px #FFDD1B, 0 0 50px #FFDD1B, 0 0 75px #FFDD1B;
  }
}

@-webkit-keyframes neon4 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #B6FF00, 0 0 70px #B6FF00, 0 0 80px #B6FF00, 0 0 100px #B6FF00, 0 0 150px #B6FF00;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #B6FF00, 0 0 35px #B6FF00, 0 0 40px #B6FF00, 0 0 50px #B6FF00, 0 0 75px #B6FF00;
  }
}

@-webkit-keyframes neon5 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #FF9900, 0 0 70px #FF9900, 0 0 80px #FF9900, 0 0 100px #FF9900, 0 0 150px #FF9900;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #FF9900, 0 0 35px #FF9900, 0 0 40px #FF9900, 0 0 50px #FF9900, 0 0 75px #FF9900;
  }
}

@-webkit-keyframes neon6 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #ff00de, 0 0 70px #ff00de, 0 0 80px #ff00de, 0 0 100px #ff00de, 0 0 150px #ff00de;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #ff00de, 0 0 35px #ff00de, 0 0 40px #ff00de, 0 0 50px #ff00de, 0 0 75px #ff00de;
  }
}
/*glow for mozilla*/

@-moz-keyframes neon1 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #FF1177, 0 0 70px #FF1177, 0 0 80px #FF1177, 0 0 100px #FF1177, 0 0 150px #FF1177;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #FF1177, 0 0 35px #FF1177, 0 0 40px #FF1177, 0 0 50px #FF1177, 0 0 75px #FF1177;
  }
}

@-moz-keyframes neon2 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #228DFF, 0 0 70px #228DFF, 0 0 80px #228DFF, 0 0 100px #228DFF, 0 0 150px #228DFF;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #228DFF, 0 0 35px #228DFF, 0 0 40px #228DFF, 0 0 50px #228DFF, 0 0 75px #228DFF;
  }
}

@-moz-keyframes neon3 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #FFDD1B, 0 0 70px #FFDD1B, 0 0 80px #FFDD1B, 0 0 100px #FFDD1B, 0 0 150px #FFDD1B;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #FFDD1B, 0 0 35px #FFDD1B, 0 0 40px #FFDD1B, 0 0 50px #FFDD1B, 0 0 75px #FFDD1B;
  }
}

@-moz-keyframes neon4 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #B6FF00, 0 0 70px #B6FF00, 0 0 80px #B6FF00, 0 0 100px #B6FF00, 0 0 150px #B6FF00;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #B6FF00, 0 0 35px #B6FF00, 0 0 40px #B6FF00, 0 0 50px #B6FF00, 0 0 75px #B6FF00;
  }
}

@-moz-keyframes neon5 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #FF9900, 0 0 70px #FF9900, 0 0 80px #FF9900, 0 0 100px #FF9900, 0 0 150px #FF9900;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #FF9900, 0 0 35px #FF9900, 0 0 40px #FF9900, 0 0 50px #FF9900, 0 0 75px #FF9900;
  }
}

@-moz-keyframes neon6 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #ff00de, 0 0 70px #ff00de, 0 0 80px #ff00de, 0 0 100px #ff00de, 0 0 150px #ff00de;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #ff00de, 0 0 35px #ff00de, 0 0 40px #ff00de, 0 0 50px #ff00de, 0 0 75px #ff00de;
  }
}
/*glow*/

@keyframes neon1 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #FF1177, 0 0 70px #FF1177, 0 0 80px #FF1177, 0 0 100px #FF1177, 0 0 150px #FF1177;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #FF1177, 0 0 35px #FF1177, 0 0 40px #FF1177, 0 0 50px #FF1177, 0 0 75px #FF1177;
  }
}

@keyframes neon2 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #228DFF, 0 0 70px #228DFF, 0 0 80px #228DFF, 0 0 100px #228DFF, 0 0 150px #228DFF;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #228DFF, 0 0 35px #228DFF, 0 0 40px #228DFF, 0 0 50px #228DFF, 0 0 75px #228DFF;
  }
}

@keyframes neon3 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #FFDD1B, 0 0 70px #FFDD1B, 0 0 80px #FFDD1B, 0 0 100px #FFDD1B, 0 0 150px #FFDD1B;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #FFDD1B, 0 0 35px #FFDD1B, 0 0 40px #FFDD1B, 0 0 50px #FFDD1B, 0 0 75px #FFDD1B;
  }
}

@keyframes neon4 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #B6FF00, 0 0 70px #B6FF00, 0 0 80px #B6FF00, 0 0 100px #B6FF00, 0 0 150px #B6FF00;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #B6FF00, 0 0 35px #B6FF00, 0 0 40px #B6FF00, 0 0 50px #B6FF00, 0 0 75px #B6FF00;
  }
}

@keyframes neon5 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #FF9900, 0 0 70px #FF9900, 0 0 80px #FF9900, 0 0 100px #FF9900, 0 0 150px #FF9900;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #FF9900, 0 0 35px #FF9900, 0 0 40px #FF9900, 0 0 50px #FF9900, 0 0 75px #FF9900;
  }
}

@keyframes neon6 {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #ff00de, 0 0 70px #ff00de, 0 0 80px #ff00de, 0 0 100px #ff00de, 0 0 150px #ff00de;
  }
  to {
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #ff00de, 0 0 35px #ff00de, 0 0 40px #ff00de, 0 0 50px #ff00de, 0 0 75px #ff00de;
  }
}
/*REEEEEEEEEEESPONSIVE*/

@media (max-width: 650px) {
  #container {
    width: 100%;
  }
  p {
    font-size: 3.5em;
  }
}
你尝试过用SVG图像替换字体吗？ - Jeremy Thille
我对SVG非常陌生，很想知道是否有可能实现这一点。我在网上进行了一些搜索，但没有找到任何关于SVG中此效果的示例。因此，我想知道SVG是否可以轻松或至少舒适地实现这一点，这是我的疑问。 - HoCo_
但是你尝试过这个吗？用SVG图像替换字体？ :) 看看它会做什么。 - Jeremy Thille
1
如果结果相同，那就意味着你可以做到。问题解决了。 - Jeremy Thille
1
啊哈，我现在明白了 >_< 嗯，答案显然是肯定的，因为Illustrator有一个“glow”滤镜，所以你的SVG可以发光。但这个问题不属于Stackoverflow，它涉及到矢量设计，这就是为什么我感到困惑的原因。 - Jeremy Thille
显示剩余5条评论
2个回答
20
是的，这是可能的。
基本思路是使用过滤器来模糊形状，将模糊的形状着色为您的霓虹颜色，然后将其放在原始文本后面。
但是，要实现最佳的霓虹效果，您需要调整颜色和发光强度。在下面的示例中，我使用了一系列不同程度的模糊层叠在一起，以获得更好的效果。这是与您链接的codepen类似的方法。但也会有其他方法来实现它。
请注意，为简单起见，此处使用的特定过滤器定义期望原始形状（文本）为白色。它可能与其他颜色配合效果不佳。但可以调整过滤器以解决此问题。 

svg {
  background-color: black;
  width: 400px;
}

text {
  font-family: Helvetica, Arial, sansserif;
  font-size: 100px;
  font-weight: 900;
  fill: white;
  filter: url(#red-glow);
}
<svg viewBox="0 0 400 400">
  <defs>
    <filter id="red-glow" filterUnits="userSpaceOnUse"
            x="-50%" y="-50%" width="200%" height="200%">
       <!-- blur the text at different levels-->
      <feGaussianBlur in="SourceGraphic" stdDeviation="5" result="blur5"/>
      <feGaussianBlur in="SourceGraphic" stdDeviation="10" result="blur10"/>
      <feGaussianBlur in="SourceGraphic" stdDeviation="20" result="blur20"/>
      <feGaussianBlur in="SourceGraphic" stdDeviation="30" result="blur30"/>
      <feGaussianBlur in="SourceGraphic" stdDeviation="50" result="blur50"/>
      <!-- merge all the blurs except for the first one -->
      <feMerge result="blur-merged">
        <feMergeNode in="blur10"/>
        <feMergeNode in="blur20"/>
        <feMergeNode in="blur30"/>
        <feMergeNode in="blur50"/>
      </feMerge>
      <!-- recolour the merged blurs red-->
      <feColorMatrix result="red-blur" in="blur-merged" type="matrix"
                     values="1 0 0 0 0
                             0 0.06 0 0 0
                             0 0 0.44 0 0
                             0 0 0 1 0" />
      <feMerge>
        <feMergeNode in="red-blur"/>       <!-- largest blurs coloured red -->
        <feMergeNode in="blur5"/>          <!-- smallest blur left white -->
        <feMergeNode in="SourceGraphic"/>  <!-- original white text -->
      </feMerge>
    </filter>
  </defs>

  <text x="200" y="200" text-anchor="middle">RED</text>
</svg>

2
可能有用的是，feColorMatrix 的倒数第二个数字在我的解决方案中具有与 feComponentTransfer 相同的效果，并且如果提高，则会增强发光效果。 - ccprog
15

以下是基本设置：

<svg width="100%" height="300">
  <filter id="neon">
    <feFlood flood-color="rgb(255,255,128)" flood-opacity="0.5" in="SourceGraphic" />
    <feComposite operator="in" in2="SourceGraphic" />
    <feGaussianBlur stdDeviation="10" />
    <feComponentTransfer result="glow1">
      <feFuncA type="linear" slope="4" intercept="0" />
    </feComponentTransfer>
    <feMerge>
       <feMergeNode in="glow1" />
       <feMergeNode in="SourceGraphic" />
    </feMerge>
  </filter>
  <rect width="100%" height="100%" fill="black" />
  <text text-anchor="middle" font-size="100" font-family="sans-serif" x="50%" y="200" fill="yellow" filter="url(#neon)">NEON</text>
</svg>

  • flood-color是发光颜色。
  • stdDeviation表示近似大小，数值越高，强度越小。
  • slope增强了发光效果并抵消了高斯模糊的稀释作用。flood-opacity也有同样的效果，但上限为1。
  • 如果要将发光效果放在字母前面，请更改<feMergeNode>的顺序。
  • 如果要叠加多个发光层（如pen中），请重复滤镜原语，除了最后一个<feMerge>，并以希望它们出现的顺序添加它们的结果到<feMerge>中。
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