freesewing/packages/examples/src/path_trim.js

export default part => {
  let { Point, points, Path, paths } = part.shorthand();

  points.center = new Point(0, 0);
  points.base = new Point(0, 10);
  points.tip = new Point(0, 50);
  points.tipCpRight = new Point(30, 50);
  points.tipCpLeft = new Point(-30, 50);
  paths.example = new Path().move(points.base);
  for (let i = 0; i < 4; i++) {
    points["base" + i] = points.base.rotate(60 * i, points.center);
    points["tip" + i] = points.tip.rotate(60 * i, points.center);
    points["tipCpRight" + i] = points.tipCpRight.rotate(60 * i, points.center);
    points["tipCpLeft" + i] = points.tipCpLeft.rotate(60 * i, points.center);
    if (i < 2) {
      paths.example
        .line(points["base" + i])
        .curve(points["base" + i], points["tipCpLeft" + i], points["tip" + i])
        .curve(
          points["tipCpRight" + i],
          points["base" + i],
          points["base" + i]
        );
    } else {
      paths.example
        .line(points["base" + i])
        .line(points["tip" + i])
        .line(points["tipCpRight" + i])
        .line(points["base" + i]);
    }
  }

  paths.offset = paths.example
    .offset(10)
    .attr("class", "lining dotted stroke-sm");

  paths.trimmed = paths.offset
    .trim()
    .attr("class", "various stroke-xl")
    .attr("style", "stroke-opacity: 0.5;");
  return part;
};