freesewing/packages/bent/src/sleeve.js

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

  function draftSleeve(part, tweak) {
    let {
      Point,
      Path,
      points,
      paths,
      store,
      options,
      measurements,
      utils
    } = part.shorthand();
    // Sleeve frame
    points.top = new Point(0, 0);
    points.boxTopRight = points.top.shift(
      0,
      (store.get("sleevecapTarget") / 5.8) * tweak
    );
    points.boxTopLeft = points.boxTopRight.flipX();
    points.boxBottom = points.top.shift(
      -90,
      measurements.shoulderToWrist * (1 + options.sleeveLengthBonus)
    );
    points.boxBottomRight = points.boxBottom.shift(0, points.boxTopRight.x);
    points.boxBottomLeft = points.boxBottomRight.flipX();
    points.armCenter = points.top.shift(
      -90,
      measurements.bicepsCircumference *
        (1 + options.bicepsEase) *
        options.sleevecapHeight *
        tweak
    );
    points.armRight = points.armCenter.shift(0, points.boxTopRight.x);
    points.armLeft = points.armRight.flipX();
    points.elbowCenter = points.top.shift(-90, measurements.shoulderToElbow);
    points.elbowRight = points.elbowCenter.shift(0, points.boxTopRight.x);
    points.elbowLeft = points.elbowRight.flipX();

    // Using sleeve width to adapt other values
    let factor = points.boxTopRight.x;

    // Note: us = undersleeve, ts = topsleeve
    points.backPitchPoint = new Point(factor, points.armCenter.y / 3);
    points.usTip = points.backPitchPoint.shift(180, factor / 4);
    points.tsLeftEdge = points.armLeft.shift(180, factor / 4);
    points.usLeftEdge = points.armLeft.shift(0, factor / 4);
    points.tsRightEdge = points.armRight.shift(0, factor / 9);
    points.usRightEdge = points.armRight.shift(180, factor / 9);
    points.frontPitchPoint = new Point(
      points.boxTopLeft.x,
      points.armCenter.y * 0.6
    );
    points.tsElbowLeft = points.elbowLeft.shift(180, factor / 9);
    points.usElbowLeft = points.elbowLeft.shift(0, factor / 2.4);

    // Different approach to sleeve bend, wrist right first
    points.tsWristRight = utils.beamsIntersect(
      points.elbowRight,
      points.boxBottomRight.rotate(options.sleeveBend * -1, points.elbowRight),
      points.boxBottomLeft,
      points.boxBottomRight
    );
    points.usWristRight = points.tsWristRight.clone();

    // Shift wrist left to the exact wrist width
    let wristWidth = measurements.wristCircumference * (1 + options.cuffEase);
    let topWrist = wristWidth / 2 + factor / 5;
    let underWrist = wristWidth / 2 - factor / 5;
    points.tsWristLeftHelperBottom = points.tsWristRight.shift(
      180,
      topWrist / 2
    );
    points.usWristLeftHelperBottom = points.usWristRight.shift(
      180,
      underWrist / 2
    );
    points.tsWristLeftHelperTop = points.tsElbowLeft.shiftFractionTowards(
      points.elbowRight,
      0.5
    );
    points.usWristLeftHelperTop = points.usElbowLeft.shiftFractionTowards(
      points.elbowRight,
      0.5
    );
    let tsWristAngle = points.tsWristLeftHelperBottom.angle(
      points.tsWristLeftHelperTop
    );
    let usWristAngle = points.usWristLeftHelperBottom.angle(
      points.usWristLeftHelperTop
    );
    points.tsWristLeft = points.tsWristRight.shift(
      tsWristAngle - 90,
      topWrist * -1
    );
    points.usWristLeft = points.usWristRight.shift(
      usWristAngle - 90,
      underWrist * -1
    );

    // Control points ts
    points.tsRightEdgeCpTop = points.tsRightEdge.shift(
      90,
      points.backPitchPoint.dy(points.tsRightEdge) / 2
    );
    points.tsRightEdgeCpBottom = points.tsRightEdgeCpTop.flipY(
      points.tsRightEdge
    );
    points.elbowRightCpTop = points.tsWristRight.shiftFractionTowards(
      points.elbowRight,
      1.15
    );
    points.topCpRight = points.top.shift(0, factor / 1.6);
    points.topCpLeft = points.topCpRight.flipX();
    points.tsLeftEdgeCpRight = points.tsLeftEdge.shift(
      0,
      points.tsLeftEdge.dist(points.armLeft) / 2
    );
    points.frontPitchPointCpBottom = points.frontPitchPoint.shiftFractionTowards(
      points.tsLeftEdgeCpRight,
      0.666
    );
    points.frontPitchPointCpTop = points.frontPitchPointCpBottom.rotate(
      180,
      points.frontPitchPoint
    );
    points.tsElbowLeftCpTop = points.tsWristLeft.shiftFractionTowards(
      points.tsElbowLeft,
      1.2
    );

    // Control points us
    points.usRightEdgeCpBottom = points.usRightEdge.shift(
      points.usTip.angle(points.elbowRight),
      points.usTip.dy(points.usRightEdge) / 2
    );
    points.usRightEdgeCpTop = points.usRightEdgeCpBottom.rotate(
      180,
      points.usRightEdge
    );
    points._helper1 = new Path()
      .move(points.backPitchPoint)
      ._curve(points.topCpRight, points.top)
      .shiftAlong(5);
    points._helper2 = new Path()
      .move(points.backPitchPoint)
      ._curve(points.tsRightEdgeCpTop, points.tsRightEdge)
      .shiftAlong(5);
    points.usLeftEdgeRight = points.usLeftEdge.shift(
      0,
      points.usLeftEdge.dist(points.armCenter) / 3
    );
    points.usLeftEdgeCpRight = points.usLeftEdge.shift(
      0,
      points.usLeftEdge.dist(points.armCenter) / 1.2
    );

    // Angle of the usTip
    let angle =
      points._helper1.angle(points.backPitchPoint) -
      points.backPitchPoint.angle(points._helper2);
    points.usTipCpBottom = points.usRightEdgeCpTop.rotate(
      angle * -1,
      points.usTip
    );
    points.usElbowLeftCpTop = points.usWristLeft.shiftFractionTowards(
      points.usElbowLeft,
      1.2
    );

    // Calculate length of the sleevecap seam
    let lenTop = new Path()
      .move(points.backPitchPoint)
      .curve(points.backPitchPoint, points.topCpRight, points.top)
      .curve(
        points.topCpLeft,
        points.frontPitchPointCpTop,
        points.frontPitchPoint
      )
      .curve(
        points.frontPitchPointCpBottom,
        points.tsLeftEdgeCpRight,
        points.tsLeftEdge
      )
      .length();
    let lenUnder = new Path()
      .move(points.usTip)
      .curve(
        points.usTipCpBottom,
        points.usLeftEdgeCpRight,
        points.usLeftEdgeRight
      )
      .line(points.usLeftEdge)
      .length();
    store.set("sleevecapLength", lenTop + lenUnder);
  }

  let armholeLength =
    store.get("frontArmholeLength") + store.get("backArmholeLength");
  let sleevecapEase = armholeLength * options.sleevecapEase;
  store.set("sleevecapEase", sleevecapEase);
  store.set("sleevecapTarget", armholeLength + sleevecapEase);

  let delta = 0;
  let runs = 0;
  let tweak = 1;
  let target = store.get("sleevecapTarget");
  do {
    draftSleeve(part, tweak);
    runs++;
    delta = store.get("sleevecapLength") - target;
    if (delta > 0) tweak = tweak * 0.99;
    else tweak = tweak * 1.02;
  } while (Math.abs(delta) > 2 && runs < 25);

  // Paths
  paths.ts = new Path()
    .move(points.tsWristRight)
    .line(points.elbowRight)
    .curve(
      points.elbowRightCpTop,
      points.tsRightEdgeCpBottom,
      points.tsRightEdge
    )
    .curve_(points.tsRightEdgeCpTop, points.backPitchPoint)
    .curve(points.backPitchPoint, points.topCpRight, points.top)
    .curve(
      points.topCpLeft,
      points.frontPitchPointCpTop,
      points.frontPitchPoint
    )
    .curve(
      points.frontPitchPointCpBottom,
      points.tsLeftEdgeCpRight,
      points.tsLeftEdge
    )
    .curve(points.tsLeftEdge, points.tsElbowLeftCpTop, points.tsElbowLeft)
    .line(points.tsWristLeft)
    .line(points.tsWristRight)
    .close()
    .attr("class", "lining");

  paths.us = new Path()
    .move(points.usWristRight)
    .line(points.elbowRight)
    .curve(
      points.elbowRightCpTop,
      points.usRightEdgeCpBottom,
      points.usRightEdge
    )
    .curve_(points.usRightEdgeCpTop, points.usTip)
    .curve(
      points.usTipCpBottom,
      points.usLeftEdgeCpRight,
      points.usLeftEdgeRight
    )
    .line(points.usLeftEdge)
    .curve(points.usLeftEdge, points.usElbowLeftCpTop, points.usElbowLeft)
    .line(points.usWristLeft)
    .line(points.usWristRight)
    .close()
    .attr("class", "stroke-xl interfacing");

  return part;
}