Steps for adding a stroke to just the left and right sides of an SVG wave:

How do I apply a stroke only to the right and left sides of an SVG (specifically a wave SVG)?

<svg class="defs-only" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<symbol id="wave">
<svg viewBox="0 0 100 50" preserveAspectRatio="none" >
    <g>
    <path d="M100,30 Q70,40 50,30 T0,30 v20 h100Z" 
          style="fill:red;" />
    </g>
 </svg>
 </symbol>
</svg>

<div class="wave">

   <svg style="width: 100%; height: 150px; margin-top: -150px;">
      <use xlink:href="#wave"/>
   </svg>

</div>

The CSS code below currently applies a stroke around the entire SVG element. How can I modify it to only apply the stroke on the left and right sides:

svg {
   stroke: #000;
}

Fiddle: https://jsfiddle.net/fe43rt4v/1/

htmlcsssvg

Answer №1

  1. Adjust the path so that the left, bottom, and right edges are drawn first: 

    M0,30 v20 h100 v-20 Q70,40 50,30 T0,30
    . While not mandatory, this modification simplifies the process (otherwise you would have to calculate the length of the wave).

  2. Utilize stroke-dasharray to specify that the stroke should be drawn for the left edge (length 20), skip the bottom (length 100), add it for the right edge (length 20), and exclude the rest (using a length of 200 as a safety measure):

    stroke-dasharray: 20,100,20,200;

That's all there is to it!

Fiddle: https://jsfiddle.net/fe43rt4v/2/

svg {
stroke: #000;
  stroke-dasharray: 20,100,20,200;
}
<svg class="defs-only" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <symbol id="wave">
    <svg viewBox="0 0 100 50" preserveAspectRatio="none" >
    <g>
      <path d="M0,30 v20 h100 v-20 Q70,40 50,30 T0,30" 
              style="fill:red;" />
    </g>
    </svg>
  </symbol>
</svg>

<div class="wave">
   <svg style="width: 100%; height: 150px; margin-top: -150px;">
  <use xlink:href="#wave"/>
   </svg>
</div>

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