├── .gitignore
├── Resources
    └── genie.gif
├── Genie.playground
    ├── Resources
    │   └── SysPrefs.png
    ├── contents.xcplayground
    ├── Sources
    │   ├── FloatingPoint+QuadraticEaseInOut.swift
    │   └── CGRect+Normalized.swift
    └── Contents.swift
├── README.md
└── LICENSE.md


/.gitignore:
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1 | xcuserdata/
2 | timeline.xctimeline
3 | playground.xcworkspace


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/Resources/genie.gif:
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https://raw.githubusercontent.com/HarshilShah/Genie/HEAD/Resources/genie.gif


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/Genie.playground/Resources/SysPrefs.png:
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https://raw.githubusercontent.com/HarshilShah/Genie/HEAD/Genie.playground/Resources/SysPrefs.png


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/Genie.playground/contents.xcplayground:
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1 | <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
2 | <playground version='5.0' target-platform='macos' display-mode='raw'>
3 |     <timeline fileName='timeline.xctimeline'/>
4 | </playground>


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/Genie.playground/Sources/FloatingPoint+QuadraticEaseInOut.swift:
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 1 | public extension FloatingPoint {
 2 | 	var quadraticEaseInOut: Self {
 3 | 		if self < 1 / 2 {
 4 | 			return 2 * self * self
 5 | 		} else {
 6 | 			return (-2 * self * self) + (4 * self) - 1
 7 | 		}
 8 | 	}
 9 | }
10 | 


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/Genie.playground/Sources/CGRect+Normalized.swift:
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 1 | import CoreGraphics
 2 | 
 3 | public extension CGRect {
 4 | 	func normalized(in other: CGRect) -> CGRect {
 5 | 		CGRect(
 6 | 			x: (origin.x - other.origin.x) / other.width,
 7 | 			y: (origin.y - other.origin.y) / other.height,
 8 | 			width: width / other.width,
 9 | 			height: height / other.height
10 | 		)
11 | 	}
12 | }
13 | 


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/README.md:
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 1 | # Genie
 2 | 
 3 | A Playground to recreate the macOS Genie Effect.
 4 | 
 5 | For more information, please read the accompanying blog post: [Recreating the macOS Genie Effect](https://harshil.net/blog/recreating-the-mac-genie-effect).
 6 | 
 7 | Note: The code has been changed a bit after the publication of the blog post. To see it as referenced there, see the [blog-post](https://github.com/HarshilShah/Genie/tree/blog-post) tag.
 8 | 
 9 | ![](https://raw.github.com/HarshilShah/Genie/main/Resources/genie.gif)
10 | 


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/LICENSE.md:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) 2021 Harshil Shah
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/Genie.playground/Contents.swift:
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  1 | import SpriteKit
  2 | import PlaygroundSupport
  3 | 
  4 | enum GenieAnimationEdge {
  5 | 	case top, bottom, left, right
  6 | 	
  7 | 	var isHorizontal: Bool {
  8 | 		switch self {
  9 | 		case .top, .bottom: return true
 10 | 		case .left, .right: return false
 11 | 		}
 12 | 	}
 13 | }
 14 | 
 15 | enum GenieAnimationDirection {
 16 | 	case minimize, maximize
 17 | }
 18 | 
 19 | func genie(maximized: CGRect, minimized: CGRect, direction: GenieAnimationDirection, edge: GenieAnimationEdge) -> SKAction {
 20 | 	let slideAnimationEndFraction = 0.5
 21 | 	let translateAnimationStartFraction = 0.4
 22 | 	
 23 | 	let duration = 0.7
 24 | 	let fps = 60.0
 25 | 	let frameCount = duration * fps
 26 | 
 27 | 	let rowCount = edge.isHorizontal ? 50 : 1
 28 | 	let columnCount = edge.isHorizontal ? 1 : 50
 29 | 	
 30 | 	let positions: [[SIMD2<Float>]] = {
 31 | 		switch edge {
 32 | 		case .top:
 33 | 			let leftBezierTopX = Double(maximized.minX)
 34 | 			let rightBezierTopX = Double(maximized.maxX)
 35 | 			
 36 | 			let leftEdgeDistanceToMove = Double(minimized.minX - maximized.minX)
 37 | 			let rightEdgeDistanceToMove = Double(minimized.maxX - maximized.maxX)
 38 | 			let verticalDistanceToMove = Double(minimized.maxY - maximized.maxY)
 39 | 			
 40 | 			let bezierTopY = Double(maximized.maxY)
 41 | 			let bezierBottomY = Double(minimized.maxY)
 42 | 			let bezierHeight = bezierTopY - bezierBottomY
 43 | 			
 44 | 			return stride(from: 0, to: frameCount, by: 1).map { frame in
 45 | 				let fraction = (frame / (frameCount - 1))
 46 | 				let slideProgress = max(0, min(1, fraction/slideAnimationEndFraction))
 47 | 				let translateProgress = max(0, min(1, (fraction - translateAnimationStartFraction)/(1 - translateAnimationStartFraction)))
 48 | 				
 49 | 				let translation = translateProgress * verticalDistanceToMove
 50 | 				let topEdgeVerticalPosition = Double(maximized.maxY) + translation
 51 | 				let bottomEdgeVerticalPosition = max(
 52 | 					Double(maximized.minY) + translation,
 53 | 					Double(minimized.minY)
 54 | 				)
 55 | 				
 56 | 				let leftBezierBottomX = leftBezierTopX + (slideProgress * leftEdgeDistanceToMove)
 57 | 				let rightBezierBottomX = rightBezierTopX + (slideProgress * rightEdgeDistanceToMove)
 58 | 				
 59 | 				func leftBezierPosition(forY y: Double) -> Double {
 60 | 					switch y {
 61 | 					case ..<bezierBottomY:
 62 | 						return leftBezierBottomX
 63 | 					case bezierBottomY ..< bezierTopY:
 64 | 						let progress = ((y - bezierBottomY) / bezierHeight).quadraticEaseInOut
 65 | 						return (progress * (leftBezierTopX - leftBezierBottomX)) + leftBezierBottomX
 66 | 					default:
 67 | 						return leftBezierTopX
 68 | 					}
 69 | 				}
 70 | 				
 71 | 				func rightBezierPosition(forY y: Double) -> Double {
 72 | 					switch y {
 73 | 					case ..<bezierBottomY:
 74 | 						return rightBezierBottomX
 75 | 					case bezierBottomY ..< bezierTopY:
 76 | 						let progress = ((y - bezierBottomY) / bezierHeight).quadraticEaseInOut
 77 | 						return (progress * (rightBezierTopX - rightBezierBottomX)) + rightBezierBottomX
 78 | 					default:
 79 | 						return rightBezierTopX
 80 | 					}
 81 | 				}
 82 | 				
 83 | 				return (0 ... rowCount)
 84 | 					.map { Double($0) / Double(rowCount) }
 85 | 					.flatMap { position -> [SIMD2<Double>] in
 86 | 						let y = (topEdgeVerticalPosition * position) + (bottomEdgeVerticalPosition * (1 - position))
 87 | 						let xMin = leftBezierPosition(forY: y)
 88 | 						let xMax = rightBezierPosition(forY: y)
 89 | 						return [SIMD2(xMin, y), SIMD2(xMax, y)]
 90 | 					}
 91 | 					.map(SIMD2<Float>.init)
 92 | 			}
 93 | 			
 94 | 		case .bottom:
 95 | 			let leftBezierBottomX = Double(maximized.minX)
 96 | 			let rightBezierBottomX = Double(maximized.maxX)
 97 | 			
 98 | 			let leftEdgeDistanceToMove = Double(minimized.minX - maximized.minX)
 99 | 			let rightEdgeDistanceToMove = Double(minimized.maxX - maximized.maxX)
100 | 			let verticalDistanceToMove = Double(minimized.minY - maximized.minY)
101 | 			
102 | 			let bezierTopY = Double(minimized.minY)
103 | 			let bezierBottomY = Double(maximized.minY)
104 | 			let bezierHeight = bezierTopY - bezierBottomY
105 | 			
106 | 			return stride(from: 0, to: frameCount, by: 1).map { frame in
107 | 				let fraction = (frame / (frameCount - 1))
108 | 				let slideProgress = max(0, min(1, fraction/slideAnimationEndFraction))
109 | 				let translateProgress = max(0, min(1, (fraction - translateAnimationStartFraction)/(1 - translateAnimationStartFraction)))
110 | 				
111 | 				let translation = translateProgress * verticalDistanceToMove
112 | 				let topEdgeVerticalPosition = min(
113 | 					Double(maximized.maxY) + translation,
114 | 					Double(minimized.maxY)
115 | 				)
116 | 				let bottomEdgeVerticalPosition = Double(maximized.minY) + translation
117 | 				
118 | 				let leftBezierTopX = leftBezierBottomX + (slideProgress * leftEdgeDistanceToMove)
119 | 				let rightBezierTopX = rightBezierBottomX + (slideProgress * rightEdgeDistanceToMove)
120 | 				
121 | 				func leftBezierPosition(forY y: Double) -> Double {
122 | 					switch y {
123 | 					case ..<bezierBottomY:
124 | 						return leftBezierBottomX
125 | 					case bezierBottomY ..< bezierTopY:
126 | 						let progress = ((y - bezierBottomY) / bezierHeight).quadraticEaseInOut
127 | 						return (progress * (leftBezierTopX - leftBezierBottomX)) + leftBezierBottomX
128 | 					default:
129 | 						return leftBezierTopX
130 | 					}
131 | 				}
132 | 				
133 | 				func rightBezierPosition(forY y: Double) -> Double {
134 | 					switch y {
135 | 					case ..<bezierBottomY:
136 | 						return rightBezierBottomX
137 | 					case bezierBottomY ..< bezierTopY:
138 | 						let progress = ((y - bezierBottomY) / bezierHeight).quadraticEaseInOut
139 | 						return (progress * (rightBezierTopX - rightBezierBottomX)) + rightBezierBottomX
140 | 					default:
141 | 						return rightBezierTopX
142 | 					}
143 | 				}
144 | 				
145 | 				return (0 ... rowCount)
146 | 					.map { Double($0) / Double(rowCount) }
147 | 					.flatMap { position -> [SIMD2<Double>] in
148 | 						let y = (topEdgeVerticalPosition * position) + (bottomEdgeVerticalPosition * (1 - position))
149 | 						let xMin = leftBezierPosition(forY: y)
150 | 						let xMax = rightBezierPosition(forY: y)
151 | 						return [SIMD2(xMin, y), SIMD2(xMax, y)]
152 | 					}
153 | 					.map(SIMD2<Float>.init)
154 | 			}
155 | 			
156 | 		case .left:
157 | 			let topBezierLeftY = Double(maximized.maxY)
158 | 			let bottomBezierLeftY = Double(maximized.minY)
159 | 			
160 | 			let topEdgeDistanceToMove = Double(minimized.maxY - maximized.maxY)
161 | 			let bottomEdgeDistanceToMove = Double(minimized.minY - maximized.minY)
162 | 			let horizontalDistanceToMove = Double(minimized.minX - maximized.minX)
163 | 			
164 | 			let bezierLeftX = Double(maximized.minX)
165 | 			let bezierRightX = Double(minimized.minX)
166 | 			let bezierWidth = bezierRightX - bezierLeftX
167 | 			
168 | 			return stride(from: 0, to: frameCount, by: 1).map { frame in
169 | 				let fraction = (frame / (frameCount - 1))
170 | 				let slideProgress = max(0, min(1, fraction/slideAnimationEndFraction))
171 | 				let translateProgress = max(0, min(1, (fraction - translateAnimationStartFraction)/(1 - translateAnimationStartFraction)))
172 | 				
173 | 				let translation = translateProgress * horizontalDistanceToMove
174 | 				let leftEdgeHorizontalPosition = Double(maximized.minX) + translation
175 | 				let rightEdgeVerticalPosition = min(
176 | 					Double(maximized.maxX) + translation,
177 | 					Double(minimized.maxX)
178 | 				)
179 | 				
180 | 				let topBezierRightY = topBezierLeftY + (slideProgress * topEdgeDistanceToMove)
181 | 				let bottomBezierRightY = bottomBezierLeftY + (slideProgress * bottomEdgeDistanceToMove)
182 | 				
183 | 				func topBezierPosition(forX x: Double) -> Double {
184 | 					switch x {
185 | 					case ..<bezierLeftX:
186 | 						return topBezierLeftY
187 | 					case bezierLeftX ..< bezierRightX:
188 | 						let progress = ((x - bezierLeftX) / bezierWidth).quadraticEaseInOut
189 | 						return (progress * (topBezierRightY - topBezierLeftY)) + topBezierLeftY
190 | 					default:
191 | 						return topBezierRightY
192 | 					}
193 | 				}
194 | 				
195 | 				func bottomBezierPosition(forX x: Double) -> Double {
196 | 					switch x {
197 | 					case ..<bezierLeftX:
198 | 						return bottomBezierLeftY
199 | 					case bezierLeftX ..< bezierRightX:
200 | 						let progress = ((x - bezierLeftX) / bezierWidth).quadraticEaseInOut
201 | 						return (progress * (bottomBezierRightY - bottomBezierLeftY)) + bottomBezierLeftY
202 | 					default:
203 | 						return bottomBezierRightY
204 | 					}
205 | 				}
206 | 				
207 | 				let topEdgePositions = (0 ... columnCount)
208 | 					.map { Double($0) / Double(columnCount) }
209 | 					.map { position -> SIMD2<Double> in
210 | 						let x = (leftEdgeHorizontalPosition * (1 - position)) + (rightEdgeVerticalPosition * position)
211 | 						let y = topBezierPosition(forX: x)
212 | 						return SIMD2(x, y)
213 | 					}
214 | 					.map(SIMD2<Float>.init)
215 | 				
216 | 				let bottomEdgePositions = (0 ... columnCount)
217 | 					.map { Double($0) / Double(columnCount) }
218 | 					.map { position -> SIMD2<Double> in
219 | 						let x = (leftEdgeHorizontalPosition * (1 - position)) + (rightEdgeVerticalPosition * position)
220 | 						let y = bottomBezierPosition(forX: x)
221 | 						return SIMD2(x, y)
222 | 					}
223 | 					.map(SIMD2<Float>.init)
224 | 				
225 | 				return bottomEdgePositions + topEdgePositions
226 | 			}
227 | 			
228 | 		case .right:
229 | 			let topBezierRightY = Double(maximized.maxY)
230 | 			let bottomBezierRightY = Double(maximized.minY)
231 | 			
232 | 			let topEdgeDistanceToMove = Double(minimized.maxY - maximized.maxY)
233 | 			let bottomEdgeDistanceToMove = Double(minimized.minY - maximized.minY)
234 | 			let horizontalDistanceToMove = Double(minimized.maxX - maximized.maxX)
235 | 			
236 | 			let bezierLeftX = Double(minimized.maxX)
237 | 			let bezierRightX = Double(maximized.maxX)
238 | 			let bezierWidth = bezierRightX - bezierLeftX
239 | 			
240 | 			return stride(from: 0, to: frameCount, by: 1).map { frame in
241 | 				let fraction = (frame / (frameCount - 1))
242 | 				let slideProgress = max(0, min(1, fraction/slideAnimationEndFraction))
243 | 				let translateProgress = max(0, min(1, (fraction - translateAnimationStartFraction)/(1 - translateAnimationStartFraction)))
244 | 				
245 | 				let translation = translateProgress * horizontalDistanceToMove
246 | 				let leftEdgeHorizontalPosition = max(
247 | 					Double(maximized.minX) + translation,
248 | 					Double(minimized.minX)
249 | 				)
250 | 				let rightEdgeVerticalPosition = Double(maximized.maxX) + translation
251 | 				
252 | 				let topBezierLeftY = topBezierRightY + (slideProgress * topEdgeDistanceToMove)
253 | 				let bottomBezierLeftY = bottomBezierRightY + (slideProgress * bottomEdgeDistanceToMove)
254 | 				
255 | 				func topBezierPosition(forX x: Double) -> Double {
256 | 					switch x {
257 | 					case ..<bezierLeftX:
258 | 						return topBezierLeftY
259 | 					case bezierLeftX ..< bezierRightX:
260 | 						let progress = ((x - bezierLeftX) / bezierWidth).quadraticEaseInOut
261 | 						return (progress * (topBezierRightY - topBezierLeftY)) + topBezierLeftY
262 | 					default:
263 | 						return topBezierRightY
264 | 					}
265 | 				}
266 | 				
267 | 				func bottomBezierPosition(forX x: Double) -> Double {
268 | 					switch x {
269 | 					case ..<bezierLeftX:
270 | 						return bottomBezierLeftY
271 | 					case bezierLeftX ..< bezierRightX:
272 | 						let progress = ((x - bezierLeftX) / bezierWidth).quadraticEaseInOut
273 | 						return (progress * (bottomBezierRightY - bottomBezierLeftY)) + bottomBezierLeftY
274 | 					default:
275 | 						return bottomBezierRightY
276 | 					}
277 | 				}
278 | 				
279 | 				let topEdgePositions = (0 ... columnCount)
280 | 					.map { Double($0) / Double(columnCount) }
281 | 					.map { position -> SIMD2<Double> in
282 | 						let x = (leftEdgeHorizontalPosition * (1 - position)) + (rightEdgeVerticalPosition * position)
283 | 						let y = topBezierPosition(forX: x)
284 | 						return SIMD2(x, y)
285 | 					}
286 | 					.map(SIMD2<Float>.init)
287 | 				
288 | 				let bottomEdgePositions = (0 ... columnCount)
289 | 					.map { Double($0) / Double(columnCount) }
290 | 					.map { position -> SIMD2<Double> in
291 | 						let x = (leftEdgeHorizontalPosition * (1 - position)) + (rightEdgeVerticalPosition * position)
292 | 						let y = bottomBezierPosition(forX: x)
293 | 						return SIMD2(x, y)
294 | 					}
295 | 					.map(SIMD2<Float>.init)
296 | 				
297 | 				return bottomEdgePositions + topEdgePositions
298 | 			}
299 | 		}
300 | 	}()
301 | 	
302 | 	let orientedPositions = direction == .minimize ? positions : positions.reversed()
303 | 	
304 | 	let warps = orientedPositions.map {
305 | 		SKWarpGeometryGrid(columns: columnCount, rows: rowCount, destinationPositions: $0)
306 | 	}
307 | 	
308 | 	return SKAction.animate(
309 | 		withWarps: warps,
310 | 		times: warps.enumerated().map {
311 | 			NSNumber(value: Double($0.offset) / fps)
312 | 		}
313 | 	)!
314 | }
315 | 
316 | let frame = CGRect(x: 0, y: 0, width: 800, height: 600)
317 | let skView = SKView(frame: frame)
318 | skView.appearance = NSAppearance(named: .aqua)
319 | PlaygroundPage.current.liveView = skView
320 | 
321 | let scene = SKScene(size: frame.size)
322 | scene.backgroundColor = .windowBackgroundColor
323 | 
324 | let imageNodes = [
325 | 	SKSpriteNode(imageNamed: "SysPrefs.png"),
326 | 	SKSpriteNode(imageNamed: "SysPrefs.png"),
327 | 	SKSpriteNode(imageNamed: "SysPrefs.png"),
328 | 	SKSpriteNode(imageNamed: "SysPrefs.png")
329 | ]
330 | 
331 | imageNodes.forEach { imageNode in
332 | 	imageNode.position = CGPoint(x: frame.midX, y: frame.midY)
333 | 	imageNode.size = frame.size
334 | 	scene.addChild(imageNode)
335 | }
336 | 
337 | skView.presentScene(scene)
338 | 
339 | let initialFrame = CGRect(x: 200, y: 100, width: 400, height: 400)
340 | 	.normalized(in: skView.frame)
341 | let initialPositions = [
342 | 	SIMD2(Float(initialFrame.minX), Float(initialFrame.minY)),
343 | 	SIMD2(Float(initialFrame.maxX), Float(initialFrame.minY)),
344 | 	SIMD2(Float(initialFrame.minX), Float(initialFrame.maxY)),
345 | 	SIMD2(Float(initialFrame.maxX), Float(initialFrame.maxY))
346 | ]
347 | imageNodes.forEach { imageNode in
348 | 	imageNode.warpGeometry = SKWarpGeometryGrid(
349 | 		columns: 1,
350 | 		rows: 1,
351 | 		destinationPositions: initialPositions
352 | 	)
353 | }
354 | 
355 | let endStates: [(edge: GenieAnimationEdge, origin: CGPoint)] = [
356 | 	(.top, CGPoint(x: 640, y: 0)),
357 | 	(.bottom, CGPoint(x: 120, y: 560)),
358 | 	(.right, CGPoint(x: 0, y: 80)),
359 | 	(.left, CGPoint(x: 760, y: 480)),
360 | ]
361 | 
362 | zip(imageNodes, endStates).forEach { imageNode, endState in
363 | 	let finalFrame = CGRect(origin: endState.origin, size: CGSize(width: 40, height: 40))
364 | 		.normalized(in: skView.frame)
365 | 	let action = genie(
366 | 		maximized: initialFrame,
367 | 		minimized: finalFrame,
368 | 		direction: .minimize,
369 | 		edge: endState.edge
370 | 	)
371 | 	imageNode.run(
372 | 		action
373 | 	)
374 | }
375 | 


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