freesewing/markdown/dev/tutorials/pattern-design/drawing-the-straps/en.md

---
title: Drawing the straps
order: 230
---

All we have to do now is flip a bunch of points on the other side,
and create one single path that follows our bib outline.

And as we now have one path to draw the bib, we can (and should)
remove the earlier paths we drew to see what we are doing.

The `round` macro we added earlier is still required to calculate the points we
need to construct the half-circle. But we don't want it to draw the half-circle
path. As it happens, that is the default behaviour, so we merely have to remove
it's `hidden: false` property.

<Example tutorial caption="It is starting to look good. But this sharp corners at the bottom don't exactly say baby, do they?">
```js
function draftBib({ 
  Path, 
  Point, 
  paths, 
  points, 
  measurements,
  options,
  macro,
  part,
}) {

  // Construct the quarter 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.quarterNeck = new Path()
  	  .move(points.right)
  	  .curve(points.rightCp1, points.bottomCp2, points.bottom)
      .hide() // Add this line
  
  	delta = paths.quarterNeck.length() - target
    if (delta > 0) tweak = tweak * 0.99
    else tweak = tweak * 1.02
  } while (Math.abs(delta) > 1)

  // Construct the complete neck opening
  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()

  // strikeout-start
  /* Remove this path
  paths.neck = new Path()
    .move(points.top)
    .curve(points.topCp2, points.leftCp1, points.left)
    .curve(points.leftCp2, points.bottomCp1, points.bottom)
    .curve(points.bottomCp2, points.rightCp1, points.right)
    .curve(points.rightCp2, points.topCp1, points.top)
    .close()
    .addClass('fabric')
   */
  // strikeout-end

  // Drawing the bib outline 
  const width = measurements.head * options.widthRatio
  const 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)
  
  // strikeout-start
  /* Remove this path
  paths.rect = new Path()
    .move(points.topLeft)
    .line(points.bottomLeft)
    .line(points.bottomRight)
    .line(points.topRight)
    .line(points.topLeft)
    .close()
    .addClass('fabric')
   */ 
  // strikeout-end

  // Shape the straps
  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 straps
  const 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",
    // strikeout-start
    /* Remove this to have the macro
     * only create the points we need
     * and not draw a path
    hide: false
    */
    // strikeout-end
  })
  macro("round", {
    from: points.tipRight,
    to: points.top,
    via: points.tipRightBottom,
    prefix: "tipRightBottom",
    // strikeout-start
    /* Remove this to have the macro
     * only create the points we need
     * and not draw a path
    hide: false
    */
    // strikeout-end
  })
  const rotateThese = [
    "edgeTopLeftCp",
    "edgeTop",
    "tipRight",
    "tipRightTop",
    "tipRightTopStart",
    "tipRightTopCp1",
    "tipRightTopCp2",
    "tipRightTopEnd",
    "tipRightBottomStart",
    "tipRightBottomCp1",
    "tipRightBottomCp2",
    "tipRightBottomEnd",
    "tipRightBottom",
    "top",
    "topCp2"
  ]
  while (points.tipRightBottomStart.x > -1) {
    for (const p of rotateThese) points[p] = points[p].rotate(1, points.edgeLeft)
  }
  
  // strikeout-start
  /* Remove this repetition
  macro("round", {
    from: points.edgeTop,
    to: points.tipRight,
    via: points.tipRightTop,
    prefix: "tipRightTop",
    hide: false,
    class: 'contrast dotted',
  })
  macro("round", {
    from: points.tipRight,
    to: points.top,
    via: points.tipRightBottom,
    prefix: "tipRightBottom",
    hide: false,
    class: 'contrast dotted',
  })

  paths.rect = new Path()
    .move(points.edgeTop)
    .curve(points.edgeTopLeftCp, points.edgeLeftCp, points.edgeLeft)
    .line(points.bottomLeft)
    .line(points.bottomRight)
    .line(points.edgeRight)
    .curve(points.edgeRightCp, points.edgeTopRightCp, points.edgeTop)
    .close()
  */
  // strikeout-end

  // highlight-start
  // Add points for second strap
  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()

  // Create one path for the bib outline
  paths.seam = new Path()
    .move(points.edgeLeft)
    .line(points.bottomLeft)
    .line(points.bottomRight)
    .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()
    .addClass("fabric")
  // highlight-end

  return part
}
```
</Example>