37 lines
769 B
Markdown
37 lines
769 B
Markdown
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---
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title: beamIntersectsY()
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---
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```js
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Point | false utils.beamIntersectsY(Point A, Point B, float Y)
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```
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Finds the intersection between an endless line and a given Y-value. Returns a [Point](#point) object
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for the intersection, or `false` there is no intersection.
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<Example part="utils_beamintersectsy" caption="A Utils.beamIntersectsY() example" />
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```js
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let {
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Point,
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points,
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Path,
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paths,
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Snippet,
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snippets,
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utils
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} = part.shorthand();
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points.A = new Point(10, 10);
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points.B = new Point(50, 40);
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paths.AB = new Path().move(points.A).line(points.B);
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snippets.x = new Snippet("notch", utils.beamIntersectsY(points.A, points.B, 30));
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paths.help = new Path()
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.move(new Point(0, 30))
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.line(new Point(50, 30))
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.attr("class", "note dashed");
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```
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