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
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1.5 KiB
| title |
|---|
| curveIntersectsY() |
array | Point | false utils.curveIntersectsY(
Point start,
Point cp1,
Point cp2,
Point end,
float y)
Finds the point(s) where a curve intersects a given Y-value.
This is a low-level variant
of Path.intersectsY().
Instead of a path, you describe a single curve by passing the four
points that describes it.
This returns false if no intersections are found,
a Point object if
a single intersection is found, and an array
of Point objects if
multiple intersections are found.
let {
Point,
points,
Path,
paths,
utils,
snippets,
Snippet
} = part.shorthand();
points.start = new Point(10, 45);
points.cp1 = new Point(50, 10);
points.cp2 = new Point(0, 80);
points.end = new Point(110, 70);
paths.curve = new Path()
.move(points.start)
.curve(points.cp1, points.cp2, points.end);
for (let y of [40, 50]) {
points["from" + y] = new Point(10, y);
points["to" + y] = new Point(110, y);
paths["line" + y] = new Path()
.move(points["from" + y])
.line(points["to" + y])
.attr("class", "lining dashed");
}
snippets.i50 = new Snippet(
"notch",
utils.curveIntersectsY(points.start, points.cp1, points.cp2, points.end, 50)
);
for (let p of utils.curveIntersectsY(
points.start,
points.cp1,
points.cp2,
points.end,
40
))
snippets[p.x] = new Snippet("notch", p);