Say you’ve gotten a line in SVG:
<svg>
<line x1=”0″ y1=”30″ x2=”500″ y2=”30″ stroke-color=”#f8a100″ />
</svg>
You need to use the stroke-dasharray property in CSS to make dashes:
line {
stroke-dasharray: 5;
}
That 5 worth is a relative unit primarily based on the dimensions of the SVG’s viewBox. We might use any CSS size, actually. However what it does is make a sample of dashes which are 5 items lengthy with 5 unit gaps between them.
Thus far, so good. We are able to use two values the place the second worth individually units the hole size:
Now now we have dashes which are 5 items and gaps which are 10. Let’s strive a 3rd worth:
See how we’re forming a sample right here? It goes:
Sprint: 5 unitsGap: 10 unitsDash: 15 items
You’d assume it repeats after that in the very same cadence. However no! It if did, we’d have dashes bumping into each other:
Sprint: 5 unitsGap: 10 itemsSprint: 15 itemsSprint: 5 itemsHole: 10 unitsDash: 15 items…and so forth.
As a substitute, stroke-dasharray will get all sensible and duplicates the sample if there are an odd variety of values So…
stroke-dasharray: 5 10 15;
/* is identical as */
stroke-dasharray: 5 10 15 5 10 15;
That’s really why a single worth works! Earlier, we declared a single 5 worth. That’s actually the identical as saying stroke-dasharray: 5 5. With out the second worth, stroke-dasharray implicitly duplicates the primary worth to get a repeatable sample. In any other case, it’d simply be a strong line of dashes which are 5 items lengthy, however no gaps between them!
The sample additionally is dependent upon the dimensions of the form itself. Our SVG line is 500 items. Let’s set bigger stroke-dasharray values and add them up:
stroke-dasharray: 10 20 30 40 50; /* 150 items */
If the sample runs 4 instances (150 items ⨉ 4 iterations), we’re coping with 600 complete items. That further 100 items is lopped off to forestall the sample from overflowing itself.
That’s all.
🎩 Hat tip to Joshua Dance for calling this out!
How stroke-dasharray Patterns Work initially printed on CSS-Tips. It’s best to get the publication.
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