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Slash and spread

When we slash and spread a pattern, we cut out a triangle, and then rotate it around the tip of the triangle.

And that's exactly what we do in code. We just need to know:

  • What point we want to rotate around
  • Which points we want to rotate
  • By how much we want to rotate
let rotate = [
  'splitEdge',
  'neckEdge',
  'cfNeck',
  'cfNeckCp1',
  'neckCp2Front',
  'neck',
  'shoulder',
  'shoulderCp1',
  'armholePitchCp2',
  'armholePitch',
  'armholePitchCp1',
  'armholeHollowCp2',
  'armholeHollow',
  'armholeHollowCp1',
  'splitCp2',
  'frontNeckCpEdge'
]
for (let p of rotate) {
  points[p] = points[p].rotate(options.chestShapingMax * options.chestShaping * -1, points.split)
}