freesewing/packages/tutorial/src/bib.js

export default function (part) {
  let {
    Point,
    points,
    Path,
    paths,
    measurements,
    options,
    macro,
    complete,
    snippets,
    Snippet,
    paperless,
  } = part.shorthand()

  // Construct the neck opening
  let tweak = 1
  let target = (measurements.head * options.neckRatio) / 4
  let delta
  do {
    points.right = new Point((tweak * measurements.head) / 10, 0)
    points.bottom = new Point(0, (tweak * measurements.head) / 12)

    points.rightCp1 = points.right.shift(90, points.bottom.dy(points.right) / 2)
    points.bottomCp2 = points.bottom.shift(0, points.bottom.dx(points.right) / 2)

    paths.neck = new Path()
      .move(points.right)
      .curve(points.rightCp1, points.bottomCp2, points.bottom)

    delta = paths.neck.length() - target
    if (delta > 0) tweak = tweak * 0.99
    else tweak = tweak * 1.02
  } while (Math.abs(delta) > 1)

  points.rightCp2 = points.rightCp1.flipY()
  points.bottomCp1 = points.bottomCp2.flipX()

  points.left = points.right.flipX()
  points.leftCp1 = points.rightCp2.flipX()
  points.leftCp2 = points.rightCp1.flipX()

  points.top = points.bottom.flipY()
  points.topCp1 = points.bottomCp2.flipY()
  points.topCp2 = points.bottomCp1.flipY()

  // Construct the outline
  let width = measurements.head * options.widthRatio
  let length = measurements.head * options.lengthRatio

  points.topLeft = new Point(width / -2, points.top.y - (width / 2 - points.right.x))
  points.topRight = points.topLeft.shift(0, width)
  points.bottomLeft = points.topLeft.shift(-90, length)
  points.bottomRight = points.topRight.shift(-90, length)

  points.edgeLeft = new Point(points.topLeft.x, points.left.y)
  points.edgeRight = new Point(points.topRight.x, points.right.y)
  points.edgeTop = new Point(0, points.topLeft.y)

  points.edgeLeftCp = points.edgeLeft.shiftFractionTowards(points.topLeft, 0.5)
  points.edgeRightCp = points.edgeLeftCp.flipX()
  points.edgeTopLeftCp = points.edgeTop.shiftFractionTowards(points.topLeft, 0.5)
  points.edgeTopRightCp = points.edgeTopLeftCp.flipX()

  // Round the end of the straps
  let strap = points.edgeTop.dy(points.top)

  points.tipRight = points.edgeTop.translate(strap / 2, strap / 2)
  points.tipRightTop = new Point(points.tipRight.x, points.edgeTop.y)
  points.tipRightBottom = new Point(points.tipRight.x, points.top.y)

  macro('round', {
    from: points.edgeTop,
    to: points.tipRight,
    via: points.tipRightTop,
    prefix: 'tipRightTop',
  })
  macro('round', {
    from: points.tipRight,
    to: points.top,
    via: points.tipRightBottom,
    prefix: 'tipRightBottom',
  })

  // Rotate straps so they don't overlap
  let rotateThese = [
    'edgeTopLeftCp',
    'edgeTop',
    'tipRight',
    'tipRightTop',
    'tipRightTopStart',
    'tipRightTopCp1',
    'tipRightTopCp2',
    'tipRightTopEnd',
    'tipRightBottomStart',
    'tipRightBottomCp1',
    'tipRightBottomCp2',
    'tipRightBottomEnd',
    'tipRightBottom',
    'top',
    'topCp2',
  ]

  while (points.tipRightBottomStart.x > -1) {
    for (let p of rotateThese) points[p] = points[p].rotate(1, points.edgeLeft)
  }

  // Add points to anchor snaps on
  points.snapLeft = points.top.shiftFractionTowards(points.edgeTop, 0.5)

  // Mirror points to the other side
  points.edgeTopRightCp = points.edgeTopLeftCp.flipX()
  points.topCp1 = points.topCp2.flipX()
  points.tipLeftTopStart = points.tipRightTopStart.flipX()
  points.tipLeftTopCp1 = points.tipRightTopCp1.flipX()
  points.tipLeftTopCp2 = points.tipRightTopCp2.flipX()
  points.tipLeftTopEnd = points.tipRightTopEnd.flipX()
  points.tipLeftBottomStart = points.tipRightBottomStart.flipX()
  points.tipLeftBottomCp1 = points.tipRightBottomCp1.flipX()
  points.tipLeftBottomCp2 = points.tipRightBottomCp2.flipX()
  points.tipLeftBottomEnd = points.tipRightBottomEnd.flipX()
  points.snapRight = points.snapLeft.flipX()

  // Round the bottom of the bib
  // Radius is fixed, but you could use an option for it)
  macro('round', {
    from: points.topLeft,
    to: points.bottomRight,
    via: points.bottomLeft,
    radius: points.bottomRight.x / 4,
    prefix: 'bottomLeft',
  })
  macro('round', {
    from: points.bottomLeft,
    to: points.topRight,
    via: points.bottomRight,
    radius: points.bottomRight.x / 4,
    prefix: 'bottomRight',
  })

  // Construct the path
  paths.seam = new Path()
    .move(points.edgeLeft)
    .line(points.bottomLeftStart)
    .curve(points.bottomLeftCp1, points.bottomLeftCp2, points.bottomLeftEnd)
    .line(points.bottomRightStart)
    .curve(points.bottomRightCp1, points.bottomRightCp2, points.bottomRightEnd)
    .line(points.edgeRight)
    .curve(points.edgeRightCp, points.edgeTopRightCp, points.tipLeftTopStart)
    .curve(points.tipLeftTopCp1, points.tipLeftTopCp2, points.tipLeftTopEnd)
    .curve(points.tipLeftBottomCp1, points.tipLeftBottomCp2, points.tipLeftBottomEnd)
    .curve(points.topCp1, points.rightCp2, points.right)
    .curve(points.rightCp1, points.bottomCp2, points.bottom)
    .curve(points.bottomCp1, points.leftCp2, points.left)
    .curve(points.leftCp1, points.topCp2, points.tipRightBottomEnd)
    .curve(points.tipRightBottomCp2, points.tipRightBottomCp1, points.tipRightBottomStart)
    .curve(points.tipRightTopCp2, points.tipRightTopCp1, points.tipRightTopStart)
    .curve(points.edgeTopLeftCp, points.edgeLeftCp, points.edgeLeft)
    .close()
    .attr('class', 'fabric')

  // Complete?
  if (complete) {
    // Add the snaps
    snippets.snapStud = new Snippet('snap-stud', points.snapLeft)
    snippets.snapSocket = new Snippet('snap-socket', points.snapRight).attr('opacity', 0.5)

    // Add the bias tape
    paths.bias = paths.seam
      .offset(-5)
      .attr('class', 'various dashed')
      .attr('data-text', 'finishWithBiasTape')
      .attr('data-text-class', 'center fill-various')

    // Add the title
    points.title = points.bottom.shift(-90, 45)
    macro('title', {
      at: points.title,
      nr: 1,
      title: 'bib',
    })

    // Add the scalebox
    points.scalebox = points.title.shift(-90, 55)
    macro('scalebox', { at: points.scalebox })

    // Add the logo
    points.logo = new Point(0, 0)
    snippets.logo = new Snippet('logo', points.logo)

    // Paperless?
    if (paperless) {
      // Add dimensions
      macro('hd', {
        from: points.bottomLeftStart,
        to: points.bottomRightEnd,
        y: points.bottomLeft.y + 15,
      })
      macro('vd', {
        from: points.bottomRightStart,
        to: points.bottom,
        x: points.bottomRight.x + 15,
      })
      macro('vd', {
        from: points.bottomRightStart,
        to: points.right,
        x: points.bottomRight.x + 30,
      })
      macro('vd', {
        from: points.bottomRightStart,
        to: points.tipLeftTopStart,
        x: points.bottomRight.x + 45,
      })
      macro('hd', {
        from: points.left,
        to: points.right,
        y: points.left.y + 25,
      })
      macro('ld', {
        from: points.tipLeftBottomEnd,
        to: points.tipLeftTopStart,
        d: -15,
      })
    }
  }

  return part
}