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154 lines
5.1 KiB
154 lines
5.1 KiB
// The MIT License (MIT)
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//
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// Copyright (c) 2016 Luke Zhao <me@lkzhao.com>
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//
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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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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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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
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// THE SOFTWARE.
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import MetalKit
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let π = CGFloat.pi
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internal struct KeySet<Key: Hashable, Value: Hashable> {
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var dict: [Key: Set<Value>] = [:]
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internal subscript(key: Key) -> Set<Value> {
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mutating get {
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if dict[key] == nil {
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dict[key] = Set<Value>()
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}
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return dict[key]!
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}
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set {
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dict[key] = newValue
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}
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}
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}
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internal extension CGSize {
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internal var center: CGPoint {
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return CGPoint(x: width / 2, y: height / 2)
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}
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internal var point: CGPoint {
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return CGPoint(x: width, y: height)
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}
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internal func transform(_ t: CGAffineTransform) -> CGSize {
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return self.applying(t)
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}
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internal func transform(_ t: CATransform3D) -> CGSize {
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return self.applying(CATransform3DGetAffineTransform(t))
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}
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}
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internal extension CGRect {
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internal var center: CGPoint {
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return CGPoint(x: origin.x + width / 2, y: origin.y + height / 2)
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}
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internal var bounds: CGRect {
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return CGRect(origin: CGPoint.zero, size: size)
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}
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init(center: CGPoint, size: CGSize) {
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self.init(x: center.x - size.width / 2, y: center.y - size.height / 2, width: size.width, height: size.height)
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}
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}
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extension CGFloat {
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internal func clamp(_ a: CGFloat, _ b: CGFloat) -> CGFloat {
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return self < a ? a : (self > b ? b : self)
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}
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}
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extension TimeInterval {
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internal func clamp(_ a: TimeInterval, _ b: TimeInterval) -> TimeInterval {
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return self < a ? a : (self > b ? b : self)
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}
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}
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extension CGPoint {
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internal func translate(_ dx: CGFloat, dy: CGFloat) -> CGPoint {
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return CGPoint(x: self.x + dx, y: self.y + dy)
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}
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internal func transform(_ t: CGAffineTransform) -> CGPoint {
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return self.applying(t)
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}
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internal func transform(_ t: CATransform3D) -> CGPoint {
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return self.applying(CATransform3DGetAffineTransform(t))
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}
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internal func distance(_ b: CGPoint) -> CGFloat {
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return sqrt(pow(self.x - b.x, 2) + pow(self.y - b.y, 2))
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}
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internal static func + (left: CGPoint, right: CGPoint) -> CGPoint {
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return CGPoint(x: left.x + right.x, y: left.y + right.y)
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}
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internal static func - (left: CGPoint, right: CGPoint) -> CGPoint {
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return CGPoint(x: left.x - right.x, y: left.y - right.y)
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}
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internal static func / (left: CGPoint, right: CGFloat) -> CGPoint {
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return CGPoint(x: left.x / right, y: left.y / right)
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}
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internal static func / (left: CGPoint, right: CGPoint) -> CGPoint {
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return CGPoint(x: left.x / right.x, y: left.y / right.y)
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}
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internal static func * (left: CGPoint, right: CGFloat) -> CGPoint {
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return CGPoint(x: left.x * right, y: left.y * right)
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}
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internal static func * (left: CGPoint, right: CGSize) -> CGPoint {
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return CGPoint(x: left.x * right.width, y: left.y * right.height)
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}
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internal static func * (left: CGFloat, right: CGPoint) -> CGPoint {
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return right * left
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}
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internal static func * (left: CGPoint, right: CGPoint) -> CGPoint {
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return CGPoint(x: left.x * right.x, y: left.y * right.y)
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}
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internal static prefix func - (point: CGPoint) -> CGPoint {
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return .zero - point
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}
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internal static func abs(_ p: CGPoint) -> CGPoint {
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return CGPoint(x: Swift.abs(p.x), y: Swift.abs(p.y))
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}
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}
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extension CGSize {
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internal static func * (left: CGSize, right: CGFloat) -> CGSize {
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return CGSize(width: left.width * right, height: left.height * right)
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}
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internal static func * (left: CGSize, right: CGSize) -> CGSize {
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return CGSize(width: left.width * right.width, height: left.height * right.height)
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}
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internal static func / (left: CGSize, right: CGSize) -> CGSize {
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return CGSize(width: left.width / right.width, height: left.height / right.height)
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}
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internal static func / (left: CGPoint, right: CGSize) -> CGPoint {
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return CGPoint(x: left.x / right.width, y: left.y / right.height)
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}
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}
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extension CATransform3D: Equatable {
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public static func == (lhs: CATransform3D, rhs: CATransform3D) -> Bool {
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var lhs = lhs
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var rhs = rhs
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return memcmp(&lhs, &rhs, MemoryLayout<CATransform3D>.size) == 0
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}
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}
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