freesewing/packages/hugo/src/waistband.js

export default function(part) {
  // prettier-ignore
  let {measurements, options, sa, Point, points, Path, paths, complete, paperless, macro, units} = part.shorthand();

  let width =
    (measurements.centerBackNeckToWaist + measurements.naturalWaistToHip) *
    options.ribbingHeight *
    2;

  points.topLeft = new Point(0, 0);
  points.bottomLeft = new Point(0, width);
  points.topMidLeft = new Point(width, 0);
  points.bottomMidLeft = new Point(width, width);
  points.topMidRight = new Point(width * 1.5, 0);
  points.bottomMidRight = new Point(width * 1.5, width);
  points.topRight = new Point(width * 2.5, 0);
  points.bottomRight = new Point(width * 2.5, width);

  paths.seam = new Path()
    .move(points.topMidLeft)
    .line(points.topLeft)
    .line(points.bottomLeft)
    .line(points.bottomMidLeft)
    .move(points.bottomMidRight)
    .line(points.bottomRight)
    .line(points.topRight)
    .line(points.topMidRight)
    .attr("class", "fabric");
  paths.hint = new Path()
    .move(points.topMidLeft)
    .line(points.topMidRight)
    .move(points.bottomMidLeft)
    .line(points.bottomMidRight)
    .attr("class", "fabric dashed");

  // Complete pattern?
  if (complete) {
    if (sa) {
      paths.sa = paths.seam.offset(sa);
    }
    points.title = points.bottomLeft.shiftFractionTowards(points.topRight, 0.5);
    macro("title", { at: points.title, nr: 8, title: "waistband" });
    macro("grainline", {
      from: points.bottomMidLeft,
      to: points.topMidLeft
    });
  }

  // Paperless?
  if (paperless) {
    macro("vd", {
      from: points.bottomRight,
      to: points.topRight,
      x: points.topRight.x + sa + 15
    });
    macro("hd", {
      from: points.bottomLeft,
      to: points.bottomRight,
      y: points.bottomRight.y + sa + 15,
      text: units(
        measurements.chestCircumference *
          (1 + options.chestEase) *
          (1 - options.ribbingStretch)
      )
    });
  }

  return part;
}