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Provides a CGAffineTransform suitable for flipping the Y Axis.
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| private func flipped(size: CGSize) -> CGAffineTransform { | |
| let mirror = CGAffineTransform(scaleX: 1, y: -1) | |
| let translate = CGAffineTransform(translationX: 0, y: size.height) | |
| return mirror.concatenating(translate) | |
| } |
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