freesewing/packages/simon/src/back.js

import { calculateReduction } from "./shared";

export default part => {
  part.paths = {}; // Removes paperless dimensions from brian
  let {
    store,
    measurements,
    utils,
    sa,
    Point,
    points,
    Path,
    paths,
    Snippet,
    snippets,
    complete,
    paperless,
    macro,
    options
  } = part.shorthand();

  // Populare store with data we need
  calculateReduction(part);
  store.set(
    "backArmholeLength",
    new Path()
      .move(points.armhole)
      .curve(points.armholeCp2, points.armholeHollowCp1, points.armholeHollow)
      .curve(
        points.armholeHollowCp2,
        points.armholePitchCp1,
        points.armholePitch
      )
      .curve(points.armholePitchCp2, points.shoulderCp1, points.shoulder)
      .length()
  );

  // Hip shaping
  points.hips = points.hips.shift(180, store.get("hipsReduction") / 4);
  points.hem = points.hem.shift(180, store.get("hipsReduction") / 4);

  // Waist shaping
  let reduce = store.get("waistReduction");
  if (reduce / 4 > options.minimalDartShaping) {
    // Add darts in the back
    points.waist = points.waist.shift(180, reduce / 8);
    points.dartCenter = points.cbWaist.shiftFractionTowards(points.waist, 0.6);
    points.dartTop = points.dartCenter.shift(
      90,
      points.armhole.dy(points.waist) * 0.75
    );
    points.dartBottom = points.dartCenter.shift(
      -90,
      measurements.naturalWaistToHip * 0.75
    );
    points.dartCenterIn = points.dartCenter.shift(180, reduce / 8);
    points.dartCenterOut = points.dartCenter.shift(0, reduce / 8);
    points.dartCenterInCp1 = points.dartCenterIn.shift(
      90,
      points.dartTop.dy(points.dartCenter) * 0.2
    );
    points.dartCenterInCp2 = points.dartCenterIn.shift(
      90,
      points.dartBottom.dy(points.dartCenter) * 0.2
    );
    points.dartCenterOutCp1 = points.dartCenterOut.shift(
      90,
      points.dartBottom.dy(points.dartCenter) * 0.2
    );
    points.dartCenterOutCp2 = points.dartCenterOut.shift(
      90,
      points.dartTop.dy(points.dartCenter) * 0.2
    );
    paths.dart = new Path()
      .move(points.dartTop)
      ._curve(points.dartCenterInCp1, points.dartCenterIn)
      .curve_(points.dartCenterInCp2, points.dartBottom)
      ._curve(points.dartCenterOutCp1, points.dartCenterOut)
      .curve_(points.dartCenterOutCp2, points.dartTop)
      .close()
      .attr("class", "fabric");
  } else {
    // No darts in the back
    points.waist = points.waist.shift(180, reduce / 4);
  }
  points.waistCp1 = points.waist.shift(
    -90,
    measurements.naturalWaistToHip * 0.5
  );
  points.waistCp2 = points.waist.shift(90, points.armhole.dy(points.waist) / 2);
  points.hipsCp2 = points.hips.shift(90, points.waist.dy(points.hips) / 4);

  // Yoke dart
  paths.armhole = new Path()
    .move(points.armhole)
    .curve(points.armholeCp2, points.armholeHollowCp1, points.armholeHollow)
    .curve(
      points.armholeHollowCp2,
      points.armholePitchCp1,
      points.armholePitch
    );
  paths.armhole.render = false;
  if (options.yokeDart > 0) {
    points.tmp1 = points.armholePitch.shift(
      -90,
      points.armholePitch.dy(points.armhole) * options.yokeDart
    );
    points.tmp2 = points.tmp1.shift(180, 50);
    points.tmp3 = points.tmp1.shift(0, 50);
    points.yokeDartEdge = utils.lineIntersectsCurve(
      points.tmp2,
      points.tmp3,
      points.armholePitch,
      points.armholePitchCp1,
      points.armholeHollowCp2,
      points.armholeHollow
    );
    points.yokeDartTip = points.armholePitch.shift(
      180,
      points.armholePitch.x * 0.4
    );
    points.yokeDartTipCp1 = points.armholePitch.shiftFractionTowards(
      points.yokeDartTip,
      0.4
    );
    paths.armhole = paths.armhole.split(points.yokeDartEdge)[0];
    paths.armhole._curve(points.yokeDartTipCp1, points.yokeDartTip);
    // Adapt armhole length to accomodate dart
    store.set(
      "backArmholeLength",
      store.get("backArmholeLength") -
        points.yokeDartEdge.dist(points.armholePitch)
    );
  }

  // Cut off at yoke
  points.cbYoke = new Point(0, points.armholePitch.y);

  // Draft hem
  switch (options.hemStyle) {
    case "baseball":
      points.bballStart = points.cbHem.shiftFractionTowards(points.hem, 0.5);
      points.bballEnd = points.hem.shiftFractionTowards(
        points.hips,
        options.hemCurve
      );
      points.bballCp1 = points.bballStart.shiftFractionTowards(points.hem, 0.5);
      points.bballCp2 = new Point(points.bballCp1.x, points.bballEnd.y);
      paths.saBase = new Path()
        .move(points.bballEnd)
        .line(points.hips)
        .curve(points.hipsCp2, points.waistCp1, points.waist)
        .curve_(points.waistCp2, points.armhole)
        .join(paths.armhole)
        .line(points.cbYoke);
      paths.hemBase = new Path()
        .move(points.cbHem)
        .line(points.bballStart)
        .curve(points.bballCp1, points.bballCp2, points.bballEnd);
      break;
    case "slashed":
      macro("round", {
        from: points.hips,
        to: points.cbHem,
        via: points.hem,
        radius: points.hips.dist(points.hem) * options.hemCurve,
        prefix: "slash"
      });
      paths.saBase = new Path()
        .move(points.hips)
        .curve(points.hipsCp2, points.waistCp1, points.waist)
        .curve_(points.waistCp2, points.armhole)
        .join(paths.armhole)
        .line(points.cbYoke);
      paths.hemBase = new Path()
        .move(points.cbHem)
        .line(points.slashEnd)
        .curve(points.slashCp2, points.slashCp1, points.slashStart);
      break;
    default:
      paths.saBase = new Path()
        .move(points.hem)
        .line(points.hips)
        .curve(points.hipsCp2, points.waistCp1, points.waist)
        .curve_(points.waistCp2, points.armhole)
        .join(paths.armhole)
        .line(points.cbYoke);
      paths.hemBase = new Path().move(points.cbHem).line(points.hem);
  }

  // Paths
  paths.saBase.render = false;
  paths.hemBase.render = false;
  paths.seam = paths.hemBase
    .join(paths.saBase)
    .close()
    .attr("class", "fabric");

  // Complete pattern?
  if (complete) {
    delete snippets.armholePitchNotch;
    macro("cutonfold", {
      from: points.cbYoke,
      to: points.cbHem,
      grainline: true
    });
    points.title = new Point(points.armhole.x / 4, points.armhole.y);
    macro("title", { at: points.title, nr: 3, title: "back" });
    points.logo = points.title.shift(-90, 70);
    snippets.logo = new Snippet("logo", points.logo);

    if (sa) {
      paths.sa = paths.saBase.offset(sa).attr("class", "fabric sa");
      paths.hemSa = paths.hemBase.offset(sa * 3).attr("class", "fabric sa");
      paths.saConnect = new Path()
        .move(points.cbHem)
        .line(paths.hemSa.start())
        .move(paths.hemSa.end())
        .line(paths.sa.start())
        .move(paths.sa.end())
        .line(points.cbYoke)
        .attr("class", "fabric sa");
      macro("banner", {
        path: "hemSa",
        text: ["hem", ": 3x", "seamAllowance"]
      });
    }
  }

  // Paperless?
  if (paperless) {
    if (reduce / 4 > options.minimalDartShaping) {
      macro("vd", {
        from: points.dartBottom,
        to: points.dartCenterIn,
        x: points.dartCenterIn.x - 15
      });
      macro("vd", {
        from: points.dartCenterIn,
        to: points.dartTop,
        x: points.dartCenterIn.x - 15
      });
      macro("hd", {
        from: points.dartCenterIn,
        to: points.dartCenterOut,
        y: points.dartBottom.y + 15
      });
      macro("hd", {
        from: points.dartCenterOut,
        to: points.waist
      });
      macro("hd", {
        from: points.cbWaist,
        to: points.dartCenterIn
      });
    } else {
      macro("hd", {
        from: points.cbWaist,
        to: points.waist
      });
    }
    let bottomRight;
    if (typeof points.slashEnd !== "undefined") {
      macro("hd", {
        from: points.cbHem,
        to: points.slashEnd,
        y: points.cbHem.y + 15 + 3 * sa
      });
      macro("vd", {
        from: points.slashEnd,
        to: points.slashStart,
        x: points.slashStart.x + 15 + 3 * sa
      });
      bottomRight = points.slashEnd;
    } else if (typeof points.bballStart !== "undefined") {
      macro("hd", {
        from: points.cbHem,
        to: points.bballStart,
        y: points.cbHem.y + 15 + 3 * sa
      });
      macro("vd", {
        from: points.bballStart,
        to: points.bballEnd,
        x: points.hips.x + 15 + sa
      });
      bottomRight = points.bballStart;
    } else bottomRight = points.hem;
    macro("hd", {
      from: points.cbHem,
      to: points.hips,
      y: points.cbHem.y + 30 + 3 * sa
    });
    macro("vd", {
      from: bottomRight,
      to: points.hips,
      x: points.hips.x + 30 + sa
    });
    macro("vd", {
      from: bottomRight,
      to: points.waist,
      x: points.hips.x + 45 + sa
    });
    macro("vd", {
      from: bottomRight,
      to: points.armhole,
      x: points.hips.x + 60 + sa
    });
    if (options.yokeDart > 0) {
      macro("vd", {
        from: points.armhole,
        to: points.yokeDartEdge,
        x: points.armhole.x + 15 + sa
      });
      macro("vd", {
        from: points.armhole,
        to: points.yokeDartTip,
        x: points.armhole.x + 30 + sa
      });
      macro("hd", {
        from: points.cbYoke,
        to: points.yokeDartTip,
        y: points.cbYoke.y - 15 - sa
      });
      macro("hd", {
        from: points.cbYoke,
        to: points.yokeDartEdge,
        y: points.cbYoke.y - 30 - sa
      });
    } else {
      macro("vd", {
        from: points.armhole,
        to: points.armholePitch,
        x: points.armhole.x + 15 + sa
      });
      macro("hd", {
        from: points.cbYoke,
        to: points.armholePitch,
        y: points.cbYoke.y - 15 - sa
      });
    }
    macro("vd", {
      from: points.cbHem,
      to: points.cbYoke,
      x: points.cbHem.x - 15
    });
  }

  return part;
};