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| // MIT License | ||
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| // Copyright (c) 2020 Haik Aslanyan | ||
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| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
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| // The above copyright notice and this permission notice shall be included in all | ||
| // copies or substantial portions of the Software. | ||
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| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| // SOFTWARE. | ||
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| import QuartzCore | ||
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| struct RCPointMapper { | ||
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| private var transform: CATransform3D | ||
| private let denominatorX: CGFloat | ||
| private let denominatorY: CGFloat | ||
| private let denominatorW: CGFloat | ||
| private let size: CGFloat | ||
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| init(transform: CATransform3D, size: Int) { | ||
| let translateDueToDisposition = CATransform3DMakeTranslation(-CGFloat(size) / 2, -CGFloat(size) / 2, 0) | ||
| self.transform = CATransform3DConcat(transform, translateDueToDisposition) | ||
| self.size = CGFloat(size) | ||
| self.denominatorX = transform.m12 * transform.m21 - transform.m11 * transform.m22 + transform.m14 * transform.m22 * transform.m41 - transform.m12 * transform.m24 * transform.m41 - transform.m14 * transform.m21 * transform.m42 + transform.m11 * transform.m24 * transform.m42 | ||
| self.denominatorY = -transform.m12 * transform.m21 + transform.m11 * transform.m22 - transform.m14 * transform.m22 * transform.m41 + transform.m12 * transform.m24 * transform.m41 + transform.m14 * transform.m21 * transform.m42 - transform.m11 * transform.m24 * transform.m42 | ||
| self.denominatorW = transform.m12 * transform.m21 - transform.m11 * transform.m22 + transform.m14 * transform.m22 * transform.m41 - transform.m12 * transform.m24 * transform.m41 - transform.m14 * transform.m21 * transform.m42 + transform.m11 * transform.m24 * transform.m42 | ||
| } | ||
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| func map(points: [CGPoint]) -> [CGPoint] { | ||
| return points.map { point in | ||
| let modelPoint = CGPoint(x: (point.x * 2.0 - size) / 2.0, y: (point.y * 2.0 - size) / 2.0) | ||
| let x = modelPoint.x | ||
| let y = modelPoint.y | ||
| let xp: CGFloat = (transform.m22 * transform.m41 - transform.m21 * transform.m42 - transform.m22 * x + transform.m24 * transform.m42 * x + transform.m21 * y - transform.m24 * transform.m41 * y) / denominatorX | ||
| let yp: CGFloat = (-transform.m11 * transform.m42 + transform.m12 * (transform.m41 - x) + transform.m14 * transform.m42 * x + transform.m11 * y - transform.m14 * transform.m41 * y) / denominatorY | ||
| let wp: CGFloat = (transform.m12 * transform.m21 - transform.m11 * transform.m22 + transform.m14 * transform.m22 * x - transform.m12 * transform.m24 * x - transform.m14 * transform.m21 * y + transform.m11 * transform.m24 * y) / denominatorW | ||
| let actualPoint = CGPoint(x: xp / wp, y: yp / wp) | ||
| let isOutOfBounds = !(0...size).contains(actualPoint.x) || !(0...size).contains(actualPoint.y) | ||
| return isOutOfBounds ? .zero : actualPoint | ||
| } | ||
| } | ||
| } |
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