I'm trying to generate an svg icon to use as Leaflet map markers. There's a circle which should be partially filled (vertically) based on a percentage variable between 0 and 1 (0 = no fill, 1 = full circle). I managed to accomplish what I need using a linear gradient, and that was working fine in Google Maps. Now I'm migrating to Leaflet, and apparently Leaflet doesn't support linear gradients in icons, as it doesn't render it properly. Or maybe it just doesn't support referencing elements with url().
This is what I have been using, using 0.4 as the fill percentage:
<svg width="25px" height="25px" viewBox="0 0 100 100" version="1.1">
<linearGradient id="perc" x1="0.4" y1="1" x2="0.4" y2="0">
<stop stop-color="#80C000" offset="0.4"/>
<stop stop-color="#fff" />
</linearGradient>
<ellipse id="outsideCircle" fill="#80C000" cx="50" cy="50" rx="42.8" ry="42.8"/>
<ellipse id="middleCircle" fill="url(#perc)" cx="50" cy="50" rx="41.2" ry="41.2"/>
<ellipse id="insideCircle" stroke="#80C000" fill="#EFFADC" stroke-width="1.6" cx="50" cy="50" rx="32" ry="32"/>
<text text-anchor="middle" font-family="Verdana" font-size="320%" font-weight="bold" dominant-baseline="central" x="50" y="48" fill="#80C000">A</text>
</svg>
Which renders as (enlarged for clarity):
However, using the exact same code in Leaflet always renders the full green circle, and I'm not sure why. So I'm looking for another way to accomplish this, maybe using Arcs? It would be great if I could generate the icons based on the same percentage variable, but I'm also open to just using 11 static icons (0, 0.1, 0.2, ..., 0.9, 1) and selecting one to use based on the percentage, rounding it.
I've found this question with some promising results, but I've been unable to adapt it to my use case.
An alternative solution would be using a line path that you clip with the circle. Now you can use the stroke-dasharray attribute to set the stroke and the gap length of the path.
I'm using an input type range only to show how the result for different values.
let len = line.getTotalLength();
itr.addEventListener("input",()=>{
let dash = itr.value * len/100;
line.setAttribute("stroke-dasharray",`${dash},${100 - dash}`);
console.clear();console.log(itr.value)
})
<P><input type="range" value="25" id="itr"/></p>
<svg width="100" viewBox="0 0 100 100" version="1.1">
<text text-anchor="middle" font-family="Verdana" font-size="320%" font-weight="bold" dominant-baseline="central" x="50" y="48" fill="#80C000">A</text>
<clipPath id="clip">
<path id="circ" d="M92.8,50A42.8, 42.8 0 1 1 7.2,50A42.8,42.8 0 1 1 92.8,50 M82,50A32,32 0 1 0 18,50 A32,32 0 1 0 82,50" />
</clipPath>
<path id="line" stroke="#80C000" stroke-width="86" d="M50,92.8V7.2" clip-path="url(#clip)" stroke-dasharray="25 75" />
<use href="#circ" fill="none" stroke="#80C000" />
</svg>
Observation: I'm rewriting thecircle as a path with a hole in the middle like so:
<svg width="100" viewBox="0 0 100 100" version="1.1">
<path id="circ" d="M92.8,50A42.8, 42.8 0 1 1 7.2,50A42.8,42.8 0 1 1 92.8,50 M82,50A32,32 0 1 0 18,50 A32,32 0 1 0 82,50" />
</svg>
In order to draw a hole into the circle I'm drawing first the outer circle clockwise and nextnthe inner circle counterclockwise. I will use this shape for the clipPath but also for a <use> element to draw the green stroke of the circle.
I'm trying to create my custom icon for FontAwesome using this tool: https://editor.method.ac/
It came with code:
<svg width="512" height="512" xmlns="http://www.w3.org/2000/svg">
<!-- Created with Method Draw - http://github.com/duopixel/Method-Draw/ -->
<g>
<title>background</title>
<rect fill="#fff" id="canvas_background" height="514" width="514" y="-1" x="-1"/>
<g display="none" overflow="visible" y="0" x="0" height="100%" width="100%" id="canvasGrid">
<rect fill="url(#gridpattern)" stroke-width="0" y="0" x="0" height="100%" width="100%"/>
</g>
</g>
<g>
<title>Layer 1</title>
<path id="svg_3" d="m367.967458,193.5l-23.50001,13.50001c0.00001,0.49999 -65.99999,-58.00001 -118,-53.00001c-52,5 -55.5,39.500009 -49,71.00001c6.5,31.5 14,63 64,111.5c50.00001,48.50001 97.50001,63.00001 119.50001,62.50001c22,-0.5 22.5,-1.5 29,-4c6.5,-2.5 8,-4.5 8,-4.5c0,0 59.49997,60.49998 61.99999,63.49999c2.50002,3.00001 -14.99998,42.50001 -80.49999,44.50001c-65.5,2 -162.50001,-44 -231.50001,-113c-69.00001,-69.00001 -100.50001,-130.00001 -103.50001,-213.00002c-3,-83.000009 62.500008,-97 90.500009,-100c28.000001,-3 85.000011,8.5 132.500011,39c47.5,30.5 68.99999,43.00001 100.5,82z" fill-opacity="null" stroke-opacity="null" stroke-width="1.5" stroke="#000" fill="#fff"/>
<path id="svg_5" d="m258.451949,258.000015l47.75001,-31.000008c0.249993,0.000007 81.249998,71.000011 105.75,36.500009c24.500001,-34.500002 -27.000002,-96.000006 -55.000004,-127.500008c-28.000001,-31.500002 -90.000005,-55.500003 -90.249997,-55.500005c0.249992,0.000002 -57.750012,-66.500002 -58.500002,-68.000003c0.000006,0.499993 46.500009,12.499994 106.500012,54.999997c60.000004,42.500002 129.000008,139.500008 141.000009,170.00001c12,30.500002 19.000001,75.500004 -3.5,94.000005c-22.500002,18.500001 -64.000004,8.000001 -90.500006,-2.5c-26.500001,-10.5 -64.500004,-41.000002 -71.500004,-45.000002c-7.000001,-4.000001 -31.500002,-25.500002 -31.750018,-25.999995z" fill-opacity="null" stroke-opacity="null" stroke-width="1.5" stroke="#000" fill="#fff"/>
</g>
</svg>
It looks good in browser.
So I prepared code for FontAwesome using this guide: https://github.com/FortAwesome/Font-Awesome/wiki/Customize-Font-Awesome
const faMyCustomIcon = {
prefix: 'fac',
iconName: 'my-custom-icon',
icon: [512, 512, [], 'e001', 'm367.967458,193.5l-23.50001,13.50001c0.00001,0.49999 -65.99999,-58.00001 -118,-53.00001c-52,5 -55.5,39.500009 -49,71.00001c6.5,31.5 14,63 64,111.5c50.00001,48.50001 97.50001,63.00001 119.50001,62.50001c22,-0.5 22.5,-1.5 29,-4c6.5,-2.5 8,-4.5 8,-4.5c0,0 59.49997,60.49998 61.99999,63.49999c2.50002,3.00001 -14.99998,42.50001 -80.49999,44.50001c-65.5,2 -162.50001,-44 -231.50001,-113c-69.00001,-69.00001 -100.50001,-130.00001 -103.50001,-213.00002c-3,-83.000009 62.500008,-97 90.500009,-100c28.000001,-3 85.000011,8.5 132.500011,39c47.5,30.5 68.99999,43.00001 100.5,82zm258.451949,258.000015l47.75001,-31.000008c0.249993,0.000007 81.249998,71.000011 105.75,36.500009c24.500001,-34.500002 -27.000002,-96.000006 -55.000004,-127.500008c-28.000001,-31.500002 -90.000005,-55.500003 -90.249997,-55.500005c0.249992,0.000002 -57.750012,-66.500002 -58.500002,-68.000003c0.000006,0.499993 46.500009,12.499994 106.500012,54.999997c60.000004,42.500002 129.000008,139.500008 141.000009,170.00001c12,30.500002 19.000001,75.500004 -3.5,94.000005c-22.500002,18.500001 -64.000004,8.000001 -90.500006,-2.5c-26.500001,-10.5 -64.500004,-41.000002 -71.500004,-45.000002c-7.000001,-4.000001 -31.500002,-25.500002 -31.750018,-25.999995z']
};
Problem is that result is this:
And should be this: (or near)
What I'm doing wrong?
This is not the answer you are expecting. I would have putted it as a comment but I need to add some code.
This is how a FontAwesome icon is looking like in SVG:
no width attribute,
no height attribute,
a viewBox attribute
inside nothing else but one path with a fill="currentColor" attribute
<svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="address-book" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="svg-inline--fa fa-address-book fa-w-14 fa-7x"><path fill="currentColor" d="M436 160c6.6 0 12-5.4 12-12v-40c0-6.6-5.4-12-12-12h-20V48c0-26.5-21.5-48-48-48H48C21.5 0 0 21.5 0 48v416c0 26.5 21.5 48 48 48h320c26.5 0 48-21.5 48-48v-48h20c6.6 0 12-5.4 12-12v-40c0-6.6-5.4-12-12-12h-20v-64h20c6.6 0 12-5.4 12-12v-40c0-6.6-5.4-12-12-12h-20v-64h20zm-228-32c35.3 0 64 28.7 64 64s-28.7 64-64 64-64-28.7-64-64 28.7-64 64-64zm112 236.8c0 10.6-10 19.2-22.4 19.2H118.4C106 384 96 375.4 96 364.8v-19.2c0-31.8 30.1-57.6 67.2-57.6h5c12.3 5.1 25.7 8 39.8 8s27.6-2.9 39.8-8h5c37.1 0 67.2 25.8 67.2 57.6v19.2z" class=""></path></svg>
Your SVG has:
a width attribute,
a height attribute,
NO viewBox attribute
inside 2 groups the second one with 2 paths.
I think you should try using only one path. In order to join the 2 paths in one path ypu can do something like this:
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
<path id="svg_3" d="m367.967458,193.5l-23.50001,13.50001c0.00001,0.49999 -65.99999,-58.00001 -118,-53.00001c-52,5 -55.5,39.500009 -49,71.00001c6.5,31.5 14,63 64,111.5c50.00001,48.50001 97.50001,63.00001 119.50001,62.50001c22,-0.5 22.5,-1.5 29,-4c6.5,-2.5 8,-4.5 8,-4.5c0,0 59.49997,60.49998 61.99999,63.49999c2.50002,3.00001 -14.99998,42.50001 -80.49999,44.50001c-65.5,2 -162.50001,-44 -231.50001,-113c-69.00001,-69.00001 -100.50001,-130.00001 -103.50001,-213.00002c-3,-83.000009 62.500008,-97 90.500009,-100c28.000001,-3 85.000011,8.5 132.500011,39c47.5,30.5 68.99999,43.00001 100.5,82z
M258.451949,258.000015l47.75001,-31.000008c0.249993,0.000007 81.249998,71.000011 105.75,36.500009c24.500001,-34.500002 -27.000002,-96.000006 -55.000004,-127.500008c-28.000001,-31.500002 -90.000005,-55.500003 -90.249997,-55.500005c0.249992,0.000002 -57.750012,-66.500002 -58.500002,-68.000003c0.000006,0.499993 46.500009,12.499994 106.500012,54.999997c60.000004,42.500002 129.000008,139.500008 141.000009,170.00001c12,30.500002 19.000001,75.500004 -3.5,94.000005c-22.500002,18.500001 -64.000004,8.000001 -90.500006,-2.5c-26.500001,-10.5 -64.500004,-41.000002 -71.500004,-45.000002c-7.000001,-4.000001 -31.500002,-25.500002 -31.750018,-25.999995z" fill="currentColor" />
</svg>
I hope it helps.