Haik Aslanyan
56 lines
3.5 KiB
Swift
56 lines
3.5 KiB
Swift
// 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
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// 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
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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import QuartzCore
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struct RCPointMapper {
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private var transform: CATransform3D
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private let denominatorX: CGFloat
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private let denominatorY: CGFloat
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private let denominatorW: CGFloat
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private let size: CGFloat
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init(transform: CATransform3D, size: Int) {
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let translateDueToDisposition = CATransform3DMakeTranslation(-CGFloat(size) / 2, -CGFloat(size) / 2, 0)
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self.transform = CATransform3DConcat(transform, translateDueToDisposition)
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self.size = CGFloat(size)
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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
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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
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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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}
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func map(points: [CGPoint]) -> [CGPoint] {
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return points.map { point in
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let modelPoint = CGPoint(x: (point.x * 2.0 - size) / 2.0, y: (point.y * 2.0 - size) / 2.0)
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let x = modelPoint.x
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let y = modelPoint.y
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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
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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
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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
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let actualPoint = CGPoint(x: xp / wp, y: yp / wp)
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let isOutOfBounds = !(0...size).contains(actualPoint.x) || !(0...size).contains(actualPoint.y)
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return isOutOfBounds ? .zero : actualPoint
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}
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}
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}
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