freesewing/packages/cathrin/src/base.js

export default function(part) {
  let {
    measurements,
    options,
    store,
    points,
    paths,
    Point,
    Path,
    utils,
    debug
  } = part.shorthand();

  // Where to divide our corset into panels
  if (options.panels === 11) store.set("gaps", [0.15, 0.275, 0.4, 0.6, 0.75]);
  else store.set("gaps", [0.2, 0.35, 0.5, 0.65, 0.8]);

  // Absolute values for some options
  store.set(
    "waistReduction",
    measurements.naturalWaist * options.waistReduction
  );
  debug({
    type: "info",
    label: "✅ Waist reduction",
    msg: utils.units(store.get("waistReduction"))
  });
  store.set("backOpening", measurements.underbust * options.backOpening);
  debug({
    type: "info",
    label: "✅ Back opening",
    msg: utils.units(store.get("backOpening"))
  });
  let len =
    measurements.naturalWaistToUnderbust + measurements.naturalWaistToHip;
  for (let option of [
    "backRise",
    "backDrop",
    "frontRise",
    "frontDrop",
    "hipRise"
  ])
    store.set(option, len * options[option]);
  store.set("length", len);

  /**
   * How much should we take in the corset at waist and bust
   *
   * I assume that the hips are larger than the underbust.
   * Can I be sure? Maybe not, but a larger underbust than hip
   * measurements seems very rare to say the least.
   */
  store.set(
    "width",
    0.5 * (measurements.hipsCircumference - store.get("backOpening"))
  );
  store.set(
    "waistIntake",
    0.5 *
      (measurements.hipsCircumference -
        measurements.naturalWaist +
        store.get("waistReduction"))
  );
  store.set(
    "bustIntake",
    0.5 * (measurements.hipsCircumference - measurements.underbust)
  );

  // Basic box (CB = Center back, CF = Center front)
  let wid = store.get("width");
  points.underbustCF = new Point(0, 0);
  points.hipsCF = new Point(0, len);
  points.hipsCB = new Point(wid, len);
  points.underbustCB = new Point(wid, 0);
  points.topSide = points.underbustCF.shiftFractionTowards(
    points.underbustCB,
    0.5
  );
  points.bottomSide = points.hipsCF.shiftFractionTowards(points.hipsCB, 0.5);
  points.waistCF = points.underbustCF.shift(
    -90,
    measurements.naturalWaistToUnderbust
  );
  points.waistCB = new Point(points.hipsCB.x, points.waistCF.y);

  // frontRise
  points.topCF = points.underbustCF.shift(90, store.get("frontRise"));
  points.frontRiseStart = points.underbustCF.shift(0, wid * 0.15);
  points.frontRiseStartCp2 = points.underbustCF.shift(0, wid * 0.11);
  points.topCFCp1 = points.topCF.shift(0, wid * 0.11);

  // frontDrop
  points.bottomCF = points.hipsCF.shift(-90, store.get("frontDrop"));
  points.bottomCFCp2 = points.bottomCF.shift(0, wid * 0.11);

  // hipRise
  points.hipRise = points.bottomSide.shift(90, store.get("hipRise"));
  points.hipRiseCp1 = points.hipRise.shift(180, wid * 0.3);
  points.hipRiseCp2 = points.hipRise.shift(0, wid * 0.2);

  // backDrop
  points.backDrop = points.hipsCB.shift(-90, store.get("backDrop"));
  points.backDropCp1 = points.backDrop.shift(180, wid * 0.3);

  // backRise
  points.backRise = points.underbustCB.shift(90, store.get("backRise"));
  points.backRiseCp1 = points.backRise.shift(180, wid * 0.4);
  points.topSideCp1 = points.topSide.shift(0, wid * 0.2);

  // Paths
  paths.help1 = new Path()
    .move(points.underbustCF)
    .line(points.hipsCF)
    .line(points.hipsCB)
    .line(points.underbustCB)
    .close();
  paths.help2 = new Path()
    .move(points.topSide)
    .line(points.bottomSide)
    .line(points.waistCF)
    .line(points.waistCB);
  paths.help1.render = false;
  paths.help2.render = false;

  paths.outline = new Path()
    .move(points.bottomCF)
    .curve(points.bottomCFCp2, points.hipRiseCp1, points.hipRise)
    .curve(points.hipRiseCp2, points.backDropCp1, points.backDrop)
    .line(points.backRise)
    .curve(points.backRiseCp1, points.topSideCp1, points.topSide)
    .line(points.frontRiseStart)
    .curve(points.frontRiseStartCp2, points.topCFCp1, points.topCF)
    .line(points.bottomCF)
    .close();

  return part;
}