freesewing/markdown/dev/reference/api/path/shiftfractionalong/en.md

title
shiftFractionAlong()

Point path.shiftFractionAlong(float fraction[, int stepsPerMm=25])

Returns a point that lies at fraction of the length of the path travelled along the path.

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

points.A = new Point(45, 60);
points.B = new Point(10, 30);
points.BCp2 = new Point(40, 20);
points.C = new Point(90, 30);
points.CCp1 = new Point(50, -30);

paths.example = new Path()
  .move(points.A)
  .line(points.B)
  .curve(points.BCp2, points.CCp1, points.C);

points.x1 = paths.example
  .shiftFractionAlong(0.2)
  .attr("data-text", "msg_20")
  .attr("data-text-class", "center")
  .attr("data-text-lineheight", 6);
points.x2 = paths.example
  .shiftFractionAlong(0.9)
  .attr("data-text", "msg_90")
  .attr("data-text-class", "center")
  .attr("data-text-lineheight", 6);

snippets.xl = new Snippet("notch", points.x1);
snippets.x2 = new Snippet("notch", points.x2);

The second parameter is optional

The second parameter controls the precision by which the path will be walked. By default, we'll divide it into 25 steps per mm.

If you don't need that precision, you can pass a lower number. But for most cases, you can just ignore it.