b34a2ee2ed
This is a flat (without history) import of (some of) the content from our markdown module. We've imported this without history because the repo contains our blog posts and showcases posts content prior to porting them to strapi. Since this contains many images, it would balloon the size of this repo to import the full history. Instead, please refer to the history of the (archived) markdown repo at: https://github.com/freesewing/markdown
79 lines
2 KiB
Markdown
79 lines
2 KiB
Markdown
---
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title: lineIntersectsCircle()
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---
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```js
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array | false utils.lineIntersectsCircle(
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Point center,
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float radius,
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Point from,
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Point to,
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string sort = 'x'
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)
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```
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Finds the intersection between a line segment from point `from` to point `to`
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and a circle with its center at point `center` and a radius of `radius` mm.
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The 5th and last parameter controls the *sorting* of the found intersections.
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When this returns 2 intersections, you can choose how they are ordered in the returned array:
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Set sort to:
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- `x` : The point with the lowest X-coordinate will go first (left to right)
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- `y` : The point with the lowest Y-coordinate will go first (top to bottom)
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<Example part="utils_lineintersectscircle" caption="A Utils.lineIntersectsCircle() 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(95, 45)
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.attr("data-circle", 35)
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.attr("data-circle-class", "fabric");
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points.B = new Point(55, 50);
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points.C = new Point(75, 30);
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points.D = new Point(55, 65);
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points.E = new Point(115, 5);
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points.F = new Point(65, 75);
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points.G = new Point(125, 15);
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paths.line1 = new Path().move(points.B).line(points.C);
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paths.line2 = new Path().move(points.D).line(points.E);
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paths.line3 = new Path().move(points.F).line(points.G);
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let intersections1 = utils.lineIntersectsCircle(
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points.A,
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points.A.attributes.get("data-circle"),
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points.B,
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points.C
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);
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let intersections2 = utils.lineIntersectsCircle(
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points.A,
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points.A.attributes.get("data-circle"),
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points.D,
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points.E,
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"y"
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);
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let intersections3 = utils.lineIntersectsCircle(
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points.A,
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points.A.attributes.get("data-circle"),
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points.F,
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points.G
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);
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snippets.first1 = new Snippet("bnotch", intersections1[0]);
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snippets.first2 = new Snippet("bnotch", intersections2[0]);
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snippets.second2 = new Snippet("notch", intersections2[1]);
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snippets.first3 = new Snippet("bnotch", intersections3[0]);
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snippets.second3 = new Snippet("notch", intersections3[1]);
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```
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