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freesewing/markdown/dev/reference/api/utils/pointoncurve/en.md
Joost De Cock b34a2ee2ed feat: Flat import of markdown repo
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
2021-08-25 16:09:31 +02:00

1.2 KiB

title
pointOnCurve()
bool utils.pointOnCurve(
  Point start, 
  Point cp1, 
  Point cp2, 
  Point end, 
  Point check
)

Returns true if the point check lies on a curve described by points start, cp1, cp2, and end.

Keep in mind that calculations with Bezier curves are often aproximations.

let {
  Point,
  points,
  Path,
  paths,
  Snippet,
  snippets,
  utils
} = part.shorthand();

points.start = new Point(10, 10);
points.cp1 = new Point(90, 10);
points.cp2 = new Point(10, 60);
points.end = new Point(90, 60);

let scatter = [];
for (let i = 1; i < 19; i++) {
  for (let j = 1; j < 14; j++) {
    scatter.push(new Point(i * 10, j * 10));
  }
}
let snippet;
for (let point of scatter) {
  if (
    utils.pointOnCurve(
      points.start,
      points.cp1,
      points.cp2,
      points.end,
      point
    )
  ) {
    snippet = "notch";
  } else snippet = "bnotch";
  snippets[part.getId()] = new Snippet(snippet, point);
}
paths.curve = new Path()
  .move(points.start)
  .curve(points.cp1, points.cp2, points.end)
  .attr("class", "fabric stroke-lg");