Things are starting to look good, but we can’t fit the bib over the baby’s head like this. So we must create a closure. We’ll let the straps overlap at the end, and put in a snap later.
Using macros
To round the straps, we’ll use something new: a macro. To use macros, we
need the macro method, which we can destructure to get access to it.
Macros are little helpers that automate things that would otherwise get rather
tedious. There are macros to add titles to our pattern, or grainline
indicators, a scalebox, and there’s a macro to round corners. The round
macro.
NOTE
You can find more information on the
round macro in the macros docs.We need a half circle here, but the round macro works on 90° angles, so
we’ll use it twice. As such, we’ll add some points to guide the macro, and
then put it to work.
Like our neck opening, we’ve only drawn half since we can simply copy the points to the other side.
mjs
design/src/bib
function draftBib({
Path,
Point,
paths,
points,
measurements,
options,
macro, part,
}
) {
/*
* Construct the quarter neck opening
*/
const target = (measurements.head * options.neckRatio) /4
let tweak = 1
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()
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()
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')
/*
* 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)
paths.rect = new Path()
.move(points.topLeft)
.line(points.bottomLeft)
.line(points.bottomRight)
.line(points.topRight)
.line(points.topLeft)
.close()
.addClass('fabric')
/*
* 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()
/*
* Now, adapt our `rect` path so it's no longer a rectangle:
*/
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()
// 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", {
id: "tipRightTop",
from: points.edgeTop,
to: points.tipRight,
via: points.tipRightTop,
hide: false
})
macro("round", {
id: "tipRightBottom",
from: points.tipRight,
to: points.top,
via: points.tipRightBottom,
hide: false
})
return part
}