4b83212f41
- Add path.intersectsBeam() method - Add utils.beamIntersectsLine() method - Simplify calculation and improve precision on beam intersections - Document return types properly - beamIntersectsCurve now uses the proper function from Bezier library instead of emulating it by constructing a huge line - docs: path.intersect... methods never return false, they simply return an empty array in case of no intersection
58 lines
1.3 KiB
Text
58 lines
1.3 KiB
Text
---
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title: Path.intersectsY()
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---
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The `Path.intersectsY()` method returns the Point object(s) where the path
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intersects with a given Y-value.
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:::warning
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This method can sometimes fail to find intersections in some curves
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due to a limitation in an underlying Bézier library.
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Please see [Bug #3367](https://github.com/freesewing/freesewing/issues/3367)
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for more information.
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:::
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## Signature
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```js
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array path.intersectsY(float y)
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```
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## Example
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<Example caption="Example of the Path.intersectsY() method">
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```js
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({ Point, points, Path, paths, snippets, Snippet, getId, part }) => {
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points.A = new Point(55, 40)
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points.B = new Point(10, 70)
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points.BCp2 = new Point(40, 20)
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points.C = new Point(90, 60)
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points.CCp1 = new Point(50, -30)
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points.D = new Point(50, 80)
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points.DCp1 = new Point(140, 50)
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points.top = new Point(10, 58)
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points.bot = new Point(130, 58)
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paths.line = new Path()
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.move(points.top)
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.line(points.bot)
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.attr("class", "lining dashed")
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paths.demo = new Path()
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.move(points.A)
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.line(points.B)
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.curve(points.BCp2, points.CCp1, points.C)
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.curve(points.DCp1, points.DCp1, points.D)
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for (let p of paths.demo.intersectsY(58)) {
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snippets[getId()] = new Snippet("notch", p)
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}
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return part
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}
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```
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</Example>
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