freesewing/markdown/dev/tutorials/pattern-design/completing-the-neck-opening/en.md

title	order
Completing the neck opening	180

As the neck opening is symmetrical, there's no need to re-calculate the points on the other side. You can just flip them over, so to speak. And that's exactly what you'll do:

First create some new points:

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()

We're using the Point.flipX() and Point.flipY() methods here. Perhaps you can figure out what they do? If not, check the API documentation.

Then, update your 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()