is it possible to make SVG circle fill color from bottom to top based on percentage?

Question

<svg viewbox="-20 -20 100 100">

  <circle r="15.29563" cx="0" stroke="#7dc4c2" fill="#5ea4a2">

</svg>

How to fill the circle as below based on percentage!!

http://i.stack.imgur.com/gVAN5.png

Thanks in advance.

Answer 1

you could use a gradient with stop-opacity to do this. you would add two "middle" stops with opacity 0 and 1 respectively an set the offset of both to the percentage you need.

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="200" height="200">
  <linearGradient id="lg" x1="0.5" y1="1" x2="0.5" y2="0">
      <stop offset="0%" stop-opacity="1" stop-color="royalblue"/>
      <stop offset="40%" stop-opacity="1" stop-color="royalblue"/>
      <stop offset="40%" stop-opacity="0" stop-color="royalblue"/>
      <stop offset="100%" stop-opacity="0" stop-color="royalblue"/>
  </linearGradient>
  <circle cx="50" cy="50" r="45" fill="url(#lg)" stroke="crimson" stroke-width="5"/>
</svg>

you could even animate it

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="200" height="200">
      <linearGradient id="lg" x1="0.5" y1="1" x2="0.5" y2="0">
          <stop offset="0%" stop-opacity="1" stop-color="royalblue"/>
          <stop offset="40%" stop-opacity="1" stop-color="royalblue">
            <animate attributeName="offset" values="0;1;0" repeatCount="indefinite" dur="10s" begin="0s"/>
          </stop>
          <stop offset="40%" stop-opacity="0" stop-color="royalblue">
            <animate attributeName="offset" values="0;1;0" repeatCount="indefinite" dur="10s"  begin="0s"/>
          </stop>
          <stop offset="100%" stop-opacity="0" stop-color="royalblue"/>
      </linearGradient>
      <circle cx="50" cy="50" r="45" fill="url(#lg)" stroke="crimson" stroke-width="5"/>
</svg>

the advantage is that this works on any shape and size without changing the gradient

   <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 600 300" width="400" height="200">
      <linearGradient id="lg" x1="0.5" y1="1" x2="0.5" y2="0">
          <stop offset="0%" stop-opacity="1" stop-color="royalblue"/>
          <stop offset="40%" stop-opacity="1" stop-color="royalblue"/>
          <stop offset="40%" stop-opacity="0" stop-color="royalblue"/>
          <stop offset="100%" stop-opacity="0" stop-color="royalblue"/>
      </linearGradient>
      <circle cx="50" cy="50" r="45" fill="url(#lg)" stroke="crimson" stroke-width="5"/>
     <circle cx="250" cy="150" r="145" fill="url(#lg)" stroke="crimson" stroke-width="5"/>
     <rect x="400" y="20" width="100" height="100" fill="url(#lg)" stroke="crimson" stroke-width="5"/>
     <path d="M50 150L95 290 h-90z" fill="url(#lg)" stroke="crimson" stroke-width="5"/>

     <path d="M450 205 A45 45 0 0 1 450 295A100 100 0 0 0 450 205z" fill="url(#lg)" stroke="crimson" stroke-width="5"/>
   </svg>