Apply CSS on part of line element in SVG [duplicate] - d3.js

Question

This question already has an answer here:
line segmentation in D3.js
(1 answer)
Closed 6 years ago.
I am creating several horizontal and vertical lines and I want to paint a segment of the line say from point a to point b in some other color. I can to the same creting multiple lines but can it be done using some svg or d3 library where you can keep the same line and just paint a segment part of that line in different css?

Answer 1

You can use a gradient for the stroke
<!-- Learn about this code on MDN: https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Gradients -->
<svg width="120" height="240" version="1.1" xmlns="http://www.w3.org/2000/svg">
<defs>
<linearGradient id="Gradient1">
<stop class="stop1" offset="0%" />
<stop class="stop2" offset="50%" />
<stop class="stop3" offset="100%" />
</linearGradient>
<linearGradient id="Gradient2" x1="0" x2="0" y1="0" y2="1">
<stop offset="0%" stop-color="red" />
<stop offset="50%" stop-color="black" stop-opacity="0" />
<stop offset="100%" stop-color="blue" />
</linearGradient>
<style type="text/css">
<![CDATA[ #rect1 {
fill: url(#Gradient1);
}
.stop1 {
stop-color: red;
}
.stop2 {
stop-color: black;
stop-opacity: 0;
}
.stop3 {
stop-color: blue;
}
]]>
</style>
</defs>
<line x1="20" y1="100" x2="100" y2="20" stroke="url(#Gradient2)" />
<rect x="10" y="120" rx="15" ry="15" width="100" height="100" fill="url(#Gradient2)" />
</svg>