ed8a166ea9
This PR reverts the incorrect lint/prettier changes applied to <Example> code in the reference Core API docs l by the husky pre-commit hook, the problem mentioned in Issue #333. (These are just the changes for the Core API docs. Additional PRs will be filed for changes in the other reference, howtos, and guides documentation.) Co-authored-by: Benjamin Fan <ben-git@swinglonga.com> Reviewed-on: https://codeberg.org/freesewing/freesewing/pulls/367 Reviewed-by: Joost De Cock <joostdecock@noreply.codeberg.org> Co-authored-by: Benjamin Fan <benjamesben@noreply.codeberg.org> Co-committed-by: Benjamin Fan <benjamesben@noreply.codeberg.org>
73 lines
1.6 KiB
Text
73 lines
1.6 KiB
Text
---
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title: utils.curveIntersectsY()
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---
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The `utils.curveIntersectsY()` function finds the point(s) where a curve
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intersects a given Y-value.
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## Signature
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```js
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array | Point | false utils.curveIntersectsY(
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Point start,
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Point cp1,
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Point cp2,
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Point end,
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float y)
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```
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This returns `false` if no intersections are found,
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a [Point](/reference/api/point/) object if
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a single intersection is found, and an array
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of [Point](/reference/api/point/) objects if
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multiple intersections are found.
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## Example
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<Example caption="A Utils.curveIntersectY() example">
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```js
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({ Point, points, Path, paths, Snippet, snippets, utils, part }) => {
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points.start = new Point(10, 45)
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points.cp1 = new Point(50, 10)
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points.cp2 = new Point(0, 80)
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points.end = new Point(110, 70)
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paths.curve = new Path()
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.move(points.start)
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.curve(points.cp1, points.cp2, points.end)
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for (let y of [40, 50]) {
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points["from" + y] = new Point(10, y)
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points["to" + y] = new Point(110, y)
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paths["line" + y] = new Path()
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.move(points["from" + y])
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.line(points["to" + y])
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.addClass("lining dashed")
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}
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snippets.i50 = new Snippet(
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"notch",
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utils.curveIntersectsY(points.start, points.cp1, points.cp2, points.end, 50)
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)
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for (let p of utils.curveIntersectsY(
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points.start,
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points.cp1,
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points.cp2,
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points.end,
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40
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))
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snippets[p.x] = new Snippet("notch", p)
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return part
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}
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```
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</Example>
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## Notes
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This is a low-level (and faster) variant
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of [`Path.intersectsY()`](/reference/api/path/intersectsy).
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Instead of a path, you describe a single curve by passing the four
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points that describes it.
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