├── README.md
├── Screenshots
    ├── screenshot_1.PNG
    ├── screenshot_2.PNG
    └── screenshot_3.PNG
└── Tree Trouble.playgroundbook
    └── Contents
        ├── Chapters
            ├── Chapter1.playgroundchapter
            │   ├── Manifest.plist
            │   └── Pages
            │   │   ├── Page1.playgroundpage
            │   │       ├── Contents.swift
            │   │       └── Manifest.plist
            │   │   └── Page2.playgroundpage
            │   │       ├── Contents.swift
            │   │       └── Manifest.plist
            └── Chapter2.playgroundchapter
            │   ├── Manifest.plist
            │   └── Pages
            │       ├── Page3.playgroundpage
            │           ├── Contents.swift
            │           ├── Manifest.plist
            │           └── PrivateResources
            │           │   └── Hints.plist
            │       ├── Page4.playgroundpage
            │           ├── Contents.swift
            │           └── Manifest.plist
            │       └── TreeTrouble.cutscenepage
            │           ├── Manifest.plist
            │           └── Resources
            │               ├── treeTroubleCutscene.html
            │               └── treeTroubleCutscene.hyperesources
            │                   ├── 484D19-restorable.plist
            │                   ├── HYPE-576.full.min.js
            │                   ├── HYPE-576.thin.min.js
            │                   ├── PIE.htc
            │                   ├── blank.gif
            │                   ├── treetroublecutscene_hype_generated_script.js
            │                   └── underlay.jpg
        ├── Manifest.plist
        ├── Resources
            ├── background.png
            ├── correct.wav
            ├── icon.png
            ├── loop.wav
            ├── underlay.jpg
            └── wrong.wav
        └── Sources
            ├── BSTScene.swift
            ├── BSTView.swift
            ├── BinarySearchTree.swift
            ├── GameScene.swift
            ├── GameView.swift
            └── Node.swift


/README.md:
--------------------------------------------------------------------------------
 1 | # Tree Trouble
 2 | >An interactive Swift Playground Book about Binary Search Trees, designed for the Swift Playgrounds application on the iPad. 
 3 | This is my personal entry for the WWDC 2017 scholarship application. The book is a simple, responsive tutorial with a 
 4 | game on the last page. You will help create, insert nodes, and traverse your own Binary Search Tree using the Swift coding 
 5 | language.
 6 | 
 7 | </br>
 8 | <img src="https://github.com/joelrorseth/Tree-Trouble/blob/master/Screenshots/screenshot_3.PNG" height="400" width="550">
 9 | </br>
10 | 
11 | # Install Instructions
12 | To run the playground book, you will need an iPad with the Swift Playgrounds application installed.
13 | 
14 | 1. In a command line, type `git clone https://github.com/joelrorseth/Tree-Trouble`
15 | 2. Open the new folder in Finder, and use Airdrop or email to `transfer the Tree Trouble.playgroundbook to the iPad device`.
16 | You can also upload the file to iCloud Drive or Google Drive, then choose to import from one of these services in the 
17 | Swift Playgrounds application.
18 | 3. On the iPad, open the file in Swift Playgrounds.
19 | 
20 | </br>
21 | 
22 | # License
23 | MIT License
24 | 
25 | Copyright (c) [2017] [Joel Rorseth]
26 | 
27 | Permission is hereby granted, free of charge, to any person obtaining a copy
28 | of this software and associated documentation files (the "Software"), to deal
29 | in the Software without restriction, including without limitation the rights
30 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
31 | copies of the Software, and to permit persons to whom the Software is
32 | furnished to do so, subject to the following conditions:
33 | 
34 | The above copyright notice and this permission notice shall be included in all
35 | copies or substantial portions of the Software.
36 | 
37 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
38 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
39 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
40 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
41 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
42 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
43 | SOFTWARE.
44 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter1.playgroundchapter/Manifest.plist:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>Version</key>
 6 | 	<string>1.0</string>
 7 | 	<key>Name</key>
 8 | 	<string>Introducing Binary Search Trees</string>
 9 | 	<key>Pages</key>
10 | 	<array>
11 | 		<string>Page1.playgroundpage</string>
12 | 		<string>Page2.playgroundpage</string>
13 | 	</array>
14 | </dict>
15 | </plist>
16 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter1.playgroundchapter/Pages/Page1.playgroundpage/Contents.swift:
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 1 | //: # Binary Search Trees
 2 | //: In the world of computer science, a high level of efficiency is expected and demanded when designing an algorithm. One of the most famous data structures employed for this use is the [Binary Search Tree](https://en.wikipedia.org/wiki/Binary_search_tree). In this playground, you’ll learn how binary search trees work by making one yourself!
 3 | 
 4 | //: ## How Do They Work?
 5 | //: Each tree is made up of several *nodes* (represented as circles) that contain a value, each being connected to other nodes by one or more *edges* (represented as lines). Each node can have zero or one parent nodes (nodes connected above a node), and zero to two child nodes (connected below). The value of each left node is less than its parent's value, and each right child's value is greater.
 6 | 
 7 | //: [Next: The Ordering Property](@next)
 8 | 
 9 | // Run the code to see how the Binary Search Tree will insert the values!
10 | var bst = BinarySearchTree(array: [4, 2, 6, 1, 3, 5, 7])
11 | 
12 | //#-hidden-code
13 | 
14 | import PlaygroundSupport
15 | var bstView = BSTView(tree: bst)
16 | PlaygroundPage.current.liveView = bstView
17 | 
18 | //#-end-hidden-code
19 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter1.playgroundchapter/Pages/Page1.playgroundpage/Manifest.plist:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>Version</key>
 6 | 	<string>1.0</string>
 7 | 	<key>Name</key>
 8 | 	<string>What is a Binary Search Tree?</string>
 9 | 	<key>LiveViewMode</key>
10 | 	<string>VisibleByDefault</string>
11 | 	<key>LiveViewEdgeToEdge</key>
12 | 	<true/>
13 | </dict>
14 | </plist>
15 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter1.playgroundchapter/Pages/Page2.playgroundpage/Contents.swift:
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 1 | //: ## But What Makes It A BST?
 2 | //: The most important part of the Binary Search Tree is the ordering property. For every node, the value of each left child node is *less than* the value of itself, and the value of each right child node is *greater than* itself! Easy!
 3 | 
 4 | //: ## Insertion
 5 | //: To insert a node, start at the root (the topmost node). Determine if the value of the new node is less than or greater than this node, and follow the left edge or right edge respectively. If there is no edge in this direction, create a *new edge* here and connect it to the new node!
 6 | 
 7 | //: Finish the code to create the tree
 8 | var bst = BinarySearchTree(value:/*#-editable-code root node*/<#T##node##Int#>/*#-end-editable-code*/)
 9 | 
10 | //: Add nodes into the tree!
11 | bst.insert(value: /*#-editable-code number*/<#T##node##Int#>/*#-end-editable-code*/)
12 | bst.insert(value: /*#-editable-code number*/<#T##node##Int#>/*#-end-editable-code*/)
13 | bst.insert(value: /*#-editable-code number*/<#T##node##Int#>/*#-end-editable-code*/)
14 | bst.insert(value: /*#-editable-code number*/<#T##node##Int#>/*#-end-editable-code*/)
15 | bst.insert(value: /*#-editable-code number*/<#T##node##Int#>/*#-end-editable-code*/)
16 | bst.insert(value: /*#-editable-code number*/<#T##node##Int#>/*#-end-editable-code*/)
17 | 
18 | //: [Next: Traversal and Ordering](@next)
19 | 
20 | //#-hidden-code
21 | 
22 | import PlaygroundSupport
23 | var bstView = BSTView(tree: bst)
24 | PlaygroundPage.current.liveView = bstView
25 | 
26 | //#-end-hidden-code
27 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter1.playgroundchapter/Pages/Page2.playgroundpage/Manifest.plist:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>Version</key>
 6 | 	<string>1.0</string>
 7 | 	<key>Name</key>
 8 | 	<string>The Ordering Property</string>
 9 | 	<key>LiveViewMode</key>
10 | 	<string>VisibleByDefault</string>
11 | 	<key>LiveViewEdgeToEdge</key>
12 | 	<true/>
13 | </dict>
14 | </plist>
15 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter2.playgroundchapter/Manifest.plist:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>Version</key>
 6 | 	<string>1.0</string>
 7 | 	<key>Name</key>
 8 | 	<string>Traversal and Ordering</string>
 9 | 	<key>Pages</key>
10 | 	<array>
11 | 		<string>Page3.playgroundpage</string>
12 | 		<string>TreeTrouble.cutscenepage</string>
13 | 		<string>Page4.playgroundpage</string>
14 | 	</array>
15 | </dict>
16 | </plist>
17 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter2.playgroundchapter/Pages/Page3.playgroundpage/Contents.swift:
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 1 | //: ## Traversal
 2 | //: One of the most notable features to the Binary Search Tree is the natural sorted nature of its elements. Using an [in-order traversal](https://en.wikipedia.org/wiki/Tree_traversal#In-order), a Binary Search Tree of any size can output its elements in ascending, sorted order!
 3 | 
 4 | //: ## In-Order Traversal
 5 | //: In a [tree traversal](https://en.wikipedia.org/wiki/Tree_traversal), we simply retrieve or process all tree nodes in a given order. To perform an *in-order traversal*, we will start at the root node, checking if it exists. The algorithm will then traverse the left subtree by recursively calling the traversal function again. It will then output the value of the current root node, followed by traversing the right subtree recursively.
 6 | 
 7 | //: Fill in the in order traversal below! Note that each BinarySearchTree has a *left*, *right*, and *parent* member variable that is itself a BinarySearchTree.
 8 | 
 9 | var sorted = [Int]()
10 | 
11 | extension BinarySearchTree {
12 |     
13 |     // Remember the order!
14 |     public func traverseInOrder() {
15 |         <#branch#>?.traverseInOrder()
16 |         sorted.append(value)
17 |         <#branch#>?.traverseInOrder()
18 |     }
19 | }
20 | 
21 | var bst = BinarySearchTree(array: [21, 14, 27, 7, 16, 24, 32])
22 | bst.traverseInOrder()
23 | 
24 | // Click the square to the right to check your answer!
25 | print(sorted)
26 | 
27 | //: [Next: Tree Trouble Challenge](@next)
28 | 
29 | //#-hidden-code
30 | 
31 | import PlaygroundSupport
32 | var bstView = BSTView(tree: bst)
33 | PlaygroundPage.current.liveView = bstView
34 | 
35 | //#-end-hidden-code
36 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter2.playgroundchapter/Pages/Page3.playgroundpage/Manifest.plist:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>Version</key>
 6 | 	<string>1.0</string>
 7 | 	<key>Name</key>
 8 | 	<string>Traversing the Tree</string>
 9 | 	<key>LiveViewMode</key>
10 | 	<string>VisibleByDefault</string>
11 | 	<key>LiveViewEdgeToEdge</key>
12 | 	<true/>
13 | </dict>
14 | </plist>
15 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter2.playgroundchapter/Pages/Page3.playgroundpage/PrivateResources/Hints.plist:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>Hints</key>
 6 | 	<array>
 7 | 		<dict>
 8 | 			<key>Content</key>
 9 | 			<string>For inorder traversal, traverse left, process the value, then traverse right!</string>
10 | 		</dict>
11 | 	</array>
12 | </dict>
13 | </plist>
14 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter2.playgroundchapter/Pages/Page4.playgroundpage/Contents.swift:
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 1 | //: ## Tree Trouble Challenge
 2 | //: Now that you have an understanding of how the Binary Search Tree works, put your skills to the test!
 3 | 
 4 | /*:
 5 |  Rules
 6 |  * Time: 60 seconds
 7 |  * Objective: Identify the incorrectly placed node in each Binary Search Tree
 8 |  * Description: The game will continuously load random Binary Search Trees that need correcting. It is your job to identify the mistake in as many as possible!
 9 |  */
10 | 
11 | import PlaygroundSupport
12 | 
13 | PlaygroundPage.current.liveView = GameView()
14 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter2.playgroundchapter/Pages/Page4.playgroundpage/Manifest.plist:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>Version</key>
 6 | 	<string>1.0</string>
 7 | 	<key>Name</key>
 8 | 	<string>Tree Trouble</string>
 9 | 	<key>LiveViewMode</key>
10 | 	<string>VisibleByDefault</string>
11 | 	<key>LiveViewEdgeToEdge</key>
12 | 	<true/>
13 | </dict>
14 | </plist>
15 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter2.playgroundchapter/Pages/TreeTrouble.cutscenepage/Manifest.plist:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>Name</key>
 6 | 	<string>Tree Trouble Cutscene</string>
 7 | 	<key>CutsceneReference</key>
 8 | 	<string>treeTroubleCutscene.html</string>
 9 | </dict>
10 | </plist>
11 | 


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/Tree Trouble.playgroundbook/Contents/Chapters/Chapter2.playgroundchapter/Pages/TreeTrouble.cutscenepage/Resources/treeTroubleCutscene.html:
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 1 | <!DOCTYPE html>
 2 | <html>
 3 |   <head>
 4 | 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 5 | 	<meta http-equiv="X-UA-Compatible" content="chrome=1,IE=edge" />
 6 | 	<title>treeTroubleCutscene</title>
 7 | 	<style>
 8 | 		html {
 9 | 			height:100%;
10 | 		}
11 | 		body {
12 | 			background-color:#FFFFFF;
13 | 			margin:0;
14 | 			height:100%;
15 | 		}
16 | 	</style>
17 | 	<!-- copy these lines to your document head: -->
18 | 
19 | 	<meta name="viewport" content="user-scalable=yes, width=1024" />
20 | 
21 | 	<!-- end copy -->
22 |   </head>
23 |   <body>
24 | 	<!-- copy these lines to your document: -->
25 | 
26 | 	<div id="treetroublecutscene_hype_container" style="margin:auto;position:relative;width:1024px;height:768px;overflow:hidden;">
27 | 		<script type="text/javascript" charset="utf-8" src="treeTroubleCutscene.hyperesources/treetroublecutscene_hype_generated_script.js?52049"></script>
28 | 	</div>
29 | 
30 | 	<!-- end copy -->
31 | 	
32 | 
33 | 
34 | 	<!-- text content for search engines: -->
35 | 
36 | 	<div style="display:none" aria-hidden=true>
37 | 
38 | 		<div>I am ready!</div>
39 | 		<div>Are you ready to test your knowledge? Hopefully you 
40 | have memorized the Binary Search Tree ordering property!</div>
41 | 		<div>Tree Trouble Challenge
42 | </div>
43 | 		<div>I need more practice!
44 | 
45 | </div>
46 | 
47 | 	</div>
48 | 
49 | 	<!-- end text content: -->
50 | 
51 |   </body>
52 | </html>
53 | 


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15 | 	<key>DeploymentTarget</key>
16 | 	<string>ios10.0</string>
17 | 	<key>Chapters</key>
18 | 	<array>
19 | 		<string>Chapter1.playgroundchapter</string>
20 | 		<string>Chapter2.playgroundchapter</string>
21 | 	</array>
22 | </dict>
23 | </plist>
24 | 


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/Tree Trouble.playgroundbook/Contents/Sources/BSTScene.swift:
--------------------------------------------------------------------------------
  1 | import SpriteKit
  2 | 
  3 | public class BSTScene: SKScene {
  4 |     
  5 |     var background = SKSpriteNode(imageNamed: "background.png")
  6 |     var nodePoints: [CGPoint] = []
  7 |     
  8 |     // =====================================
  9 |     // =====================================
 10 |     override public func didMove(to view: SKView) {
 11 |         
 12 |         // Add background image to scene as a node
 13 |         background.position = CGPoint(x: frame.size.width / 2, y: frame.size.height / 2)
 14 |         background.scale(to: self.size)
 15 |         addChild(background)
 16 |     }
 17 |     
 18 |     // =====================================
 19 |     // =====================================
 20 |     func createTree(tree: BinarySearchTree) {
 21 |         
 22 |         drawBST(tree: tree,
 23 |                 within: CGSize(width: self.size.width,
 24 |                                height: self.size.height),
 25 |                 at: CGPoint(x: self.size.width / 2, y: self.size.height - 80),
 26 |                 offset: CGFloat(tree.height()),
 27 |                 originalHeight: tree.height())
 28 |     }
 29 |     
 30 |     
 31 |     // MARK: Drawing
 32 |     // =====================================
 33 |     // =====================================
 34 |     public func drawEdge(from pointA: CGPoint, to pointB: CGPoint, width: CGFloat) {
 35 |         
 36 |         let edgePath  = CGMutablePath()
 37 |         edgePath.move(to: CGPoint(x: pointA.x, y: pointA.y))
 38 |         edgePath.addLine(to: CGPoint(x: pointB.x, y: pointB.y))
 39 |         
 40 |         // Create a SKShapeNode to represent the edge as a straight line
 41 |         let shape = SKShapeNode()
 42 |         shape.path = edgePath
 43 |         shape.strokeColor = SKColor.black
 44 |         shape.lineWidth = width
 45 |         shape.zPosition = 4
 46 |         
 47 |         addChild(shape)
 48 |     }
 49 |     
 50 |     // =====================================
 51 |     // =====================================
 52 |     public func drawNode(at point: CGPoint, value: Int, radius: CGFloat, color: SKColor, dynamic: Bool = false) {
 53 |         
 54 |         // Create Node and set position in scene
 55 |         let sprite = Node()
 56 |         sprite.setup(value: value, radius: radius, color: color, dynamic: dynamic)
 57 |         sprite.position = point
 58 |         
 59 |         self.addChild(sprite)
 60 |     }
 61 |     
 62 |     // =====================================
 63 |     // =====================================
 64 |     public func drawBST(tree: BinarySearchTree, within size: CGSize, at point: CGPoint, offset: CGFloat, originalHeight: Int) {
 65 |         
 66 |         
 67 |         // Use temp placeholders for size and color
 68 |         let nodeColor = SKColor.white
 69 |         let temp = tree
 70 |         
 71 |         let nodeRadius = CGFloat(size.width / (2 * pow(2, CGFloat(originalHeight + 1))))
 72 |         let spacingWidth = CGFloat(size.width / (2 * pow(2, CGFloat(temp.depth() + 1))))
 73 |         let spacingHeight = size.height / CGFloat(originalHeight + 1)
 74 |         
 75 |         
 76 |         // Traverse left branch, decrement x and increment y positions
 77 |         if (temp.hasLeftChild) {
 78 |             
 79 |             // Calculate new point, draw edge between current and new nodes
 80 |             let newPoint = CGPoint(x: point.x - spacingWidth, y: point.y - spacingHeight)
 81 |             self.drawEdge(from: point, to: newPoint, width: 2)
 82 |             
 83 |             drawBST(tree: temp.left!,
 84 |                     within: size,
 85 |                     at: newPoint,
 86 |                     offset: (offset - 1),
 87 |                     originalHeight: originalHeight)
 88 |         }
 89 |         
 90 |         
 91 |         // Traverse right branch, increment x and y positions
 92 |         if (temp.hasRightChild) {
 93 |             
 94 |             // Calculate new point, draw edge between current and new nodes
 95 |             let newPoint = CGPoint(x: point.x + spacingWidth, y: point.y - spacingHeight)
 96 |             self.drawEdge(from: point, to: newPoint, width: 2)
 97 |             
 98 |             drawBST(tree: temp.right!,
 99 |                     within: size,
100 |                     at: newPoint,
101 |                     offset: (offset - 1),
102 |                     originalHeight: originalHeight)
103 |         }
104 |         
105 |         // Add node now that traversal has exhausted itself to this Node
106 |         drawNode(at: point, value: temp.value, radius: nodeRadius, color: nodeColor)
107 |     }
108 | }
109 | 


--------------------------------------------------------------------------------
/Tree Trouble.playgroundbook/Contents/Sources/BSTView.swift:
--------------------------------------------------------------------------------
  1 | import SpriteKit
  2 | 
  3 | public class BSTView: UIViewController {
  4 |     
  5 |     var gameView: SKView!
  6 |     var binarySearchTree: BinarySearchTree?
  7 |     
  8 |     // =====================================
  9 |     // =====================================
 10 |     public init (tree: BinarySearchTree) {
 11 |         super.init(nibName: nil, bundle: nil)
 12 |         self.binarySearchTree = tree
 13 |     }
 14 |     
 15 |     // =====================================
 16 |     // =====================================
 17 |     required public init?(coder aDecoder: NSCoder) {
 18 |         fatalError("init(coder:) has not been implemented")
 19 |     }
 20 |     
 21 |     // =====================================
 22 |     // =====================================
 23 |     public override func viewDidLoad() {
 24 |         
 25 |         // Underlay will take up entire Playground liveView
 26 |         let backgroundView = UIImageView(image: UIImage(named: "underlay.jpg"))
 27 |         backgroundView.isUserInteractionEnabled = true
 28 |         self.view = backgroundView
 29 |         
 30 |         // Setup content view, disable automatic constraints
 31 |         gameView = SKView()
 32 |         gameView.translatesAutoresizingMaskIntoConstraints = false
 33 |         gameView.backgroundColor = UIColor.clear
 34 |         self.view.addSubview(gameView)
 35 |         
 36 |         // These constraints have lower priority, kick in if it can satisfy others
 37 |         let leading = NSLayoutConstraint(item: gameView,
 38 |                                          attribute: .leading,
 39 |                                          relatedBy: .equal,
 40 |                                          toItem: self.view,
 41 |                                          attribute: .leading,
 42 |                                          multiplier: 1.0,
 43 |                                          constant: 0)
 44 |         leading.priority = UILayoutPriority(750.0)
 45 |         
 46 |         let trailing = NSLayoutConstraint(item: gameView,
 47 |                                           attribute: .trailing,
 48 |                                           relatedBy: .equal,
 49 |                                           toItem: self.view,
 50 |                                           attribute: .trailing,
 51 |                                           multiplier: 1.0,
 52 |                                           constant: 0)
 53 |         trailing.priority = UILayoutPriority(750.0)
 54 |         
 55 |         // These constraints have highest priority
 56 |         let centerHorizontally = NSLayoutConstraint(item: gameView,
 57 |                                                     attribute: .centerX,
 58 |                                                     relatedBy: .equal,
 59 |                                                     toItem: self.view,
 60 |                                                     attribute: .centerX,
 61 |                                                     multiplier: 1.0,
 62 |                                                     constant: 0.0)
 63 |         centerHorizontally.priority = UILayoutPriority(1000.0)
 64 |         
 65 |         let centerVertically = NSLayoutConstraint(item: gameView,
 66 |                                                   attribute: .centerY,
 67 |                                                   relatedBy: .equal,
 68 |                                                   toItem: self.view,
 69 |                                                   attribute: .centerY,
 70 |                                                   multiplier: 1.0,
 71 |                                                   constant: 0.0)
 72 |         centerVertically.priority = UILayoutPriority(1000.0)
 73 |         
 74 |         let aspectRatio = NSLayoutConstraint(item: gameView,
 75 |                                              attribute: .height,
 76 |                                              relatedBy: .equal,
 77 |                                              toItem: gameView,
 78 |                                              attribute: .width,
 79 |                                              multiplier: 1.0,
 80 |                                              constant: 0.0)
 81 |         aspectRatio.priority = UILayoutPriority(1000.0)
 82 |         
 83 |         let width = NSLayoutConstraint(item: gameView,
 84 |                                        attribute: .width,
 85 |                                        relatedBy: .lessThanOrEqual,
 86 |                                        toItem: self.view,
 87 |                                        attribute: .width,
 88 |                                        multiplier: 1.0,
 89 |                                        constant: 0)
 90 |         width.priority = UILayoutPriority(1000.0)
 91 |         
 92 |         let height = NSLayoutConstraint(item: gameView,
 93 |                                         attribute: .height,
 94 |                                         relatedBy: .lessThanOrEqual,
 95 |                                         toItem: self.view,
 96 |                                         attribute: .height,
 97 |                                         multiplier: 1.0,
 98 |                                         constant: 0)
 99 |         height.priority = UILayoutPriority(1000.0)
100 |         
101 |         
102 |         // Add constraints to the view to resize gameView dynamically
103 |         // These constraints are especially important on the iPad
104 |         NSLayoutConstraint.activate([leading, trailing, centerVertically, centerHorizontally, aspectRatio, width, height])
105 |     }
106 |     
107 |     // =====================================
108 |     // =====================================
109 |     public override func viewDidAppear(_ animated: Bool) {
110 |         
111 |         // Scene must be setup after gameView size has been determined
112 |         let scene = BSTScene(size: CGSize(
113 |             width: gameView.frame.size.width,
114 |             height: gameView.frame.size.height
115 |         ))
116 |         
117 |         // Scene will be identical in size to gameView
118 |         scene.scaleMode = .aspectFit
119 |         
120 |         // Create the Binary Search Tree that this scene will be displaying
121 |         scene.createTree(tree: self.binarySearchTree!)
122 |         self.gameView.presentScene(scene)
123 |     }
124 | }
125 | 


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/Tree Trouble.playgroundbook/Contents/Sources/BinarySearchTree.swift:
--------------------------------------------------------------------------------
  1 | public class BinarySearchTree {
  2 |     
  3 |     fileprivate(set) public var value: Int
  4 |     fileprivate(set) public var parent: BinarySearchTree?
  5 |     fileprivate(set) public var left: BinarySearchTree?
  6 |     fileprivate(set) public var right: BinarySearchTree?
  7 |     
  8 |     // =====================================
  9 |     // =====================================
 10 |     public init(value: Int) {
 11 |         self.value = value
 12 |     }
 13 |     
 14 |     // =====================================
 15 |     // =====================================
 16 |     public convenience init(array: [Int]) {
 17 |         precondition(array.count > 0)
 18 |         self.init(value: array.first!)
 19 |         
 20 |         // Insert each value one by one using insert()
 21 |         for value in array.dropFirst() {
 22 |             insert(value: value)
 23 |         }
 24 |     }
 25 |     
 26 |     // =====================================
 27 |     // =====================================
 28 |     public func insert(value: Int) {
 29 |         
 30 |         // If less, insert into left branch recursively
 31 |         if value < self.value {
 32 |             if let left = left {
 33 |                 left.insert(value: value)
 34 |             } else {
 35 |                 left = BinarySearchTree(value: value)
 36 |                 left?.parent = self
 37 |             }
 38 |             
 39 |             // Else insert into right branch recursively
 40 |         } else {
 41 |             if let right = right {
 42 |                 right.insert(value: value)
 43 |             } else {
 44 |                 right = BinarySearchTree(value: value)
 45 |                 right?.parent = self
 46 |             }
 47 |         }
 48 |     }
 49 |     
 50 |     // =====================================
 51 |     // =====================================
 52 |     public var isRoot: Bool {
 53 |         return parent == nil
 54 |     }
 55 |     
 56 |     // =====================================
 57 |     // =====================================
 58 |     public var isLeaf: Bool {
 59 |         return left == nil && right == nil
 60 |     }
 61 |     
 62 |     // =====================================
 63 |     // =====================================
 64 |     public var hasLeftChild: Bool {
 65 |         return left != nil
 66 |     }
 67 |     
 68 |     // =====================================
 69 |     // =====================================
 70 |     public var hasRightChild: Bool {
 71 |         return right != nil
 72 |     }
 73 |     
 74 |     // =====================================
 75 |     // Nuber of nodes in subtree
 76 |     // =====================================
 77 |     public var count: Int {
 78 |         return (left?.count ?? 0) + 1 + (right?.count ?? 0)
 79 |     }
 80 |     
 81 |     // =====================================
 82 |     // =====================================
 83 |     public func depth() -> Int {
 84 |         var node = self
 85 |         var edges = 0
 86 |         while case let parent? = node.parent {
 87 |             node = parent
 88 |             edges += 1
 89 |         }
 90 |         return edges
 91 |     }
 92 |     
 93 |     // =====================================
 94 |     // =====================================
 95 |     public func height() -> Int {
 96 |         if isLeaf {
 97 |             return 0
 98 |         } else {
 99 |             return 1 + max(left?.height() ?? 0, right?.height() ?? 0)
100 |         }
101 |     }
102 |     
103 |     // =====================================
104 |     // Important for the game (Validate correctness of BST)
105 |     // =====================================
106 |     public func isBST(minValue: Int, maxValue: Int) -> Bool {
107 |         
108 |         if (value < minValue || value > maxValue) { return false }
109 |         let leftBST = left?.isBST(minValue: minValue, maxValue: value) ?? true
110 |         let rightBST = right?.isBST(minValue: value, maxValue: maxValue) ?? true
111 |         return leftBST && rightBST
112 |     }
113 |     
114 |     // =====================================
115 |     // Search / Find node with value
116 |     // =====================================
117 |     public func findNode(value: Int) -> BinarySearchTree? {
118 |         var nodeToCheck: BinarySearchTree? = self
119 |         
120 |         while case let currentNode? = nodeToCheck {
121 |             if value < currentNode.value {
122 |                 nodeToCheck = currentNode.left
123 |             } else if value > currentNode.value {
124 |                 nodeToCheck = currentNode.right
125 |             } else {
126 |                 return nodeToCheck
127 |             }
128 |         }
129 |         return nil
130 |     }
131 | }
132 | 


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/Tree Trouble.playgroundbook/Contents/Sources/GameScene.swift:
--------------------------------------------------------------------------------
  1 | import SpriteKit
  2 | import Social
  3 | import GameplayKit
  4 | 
  5 | public class GameScene: SKScene {
  6 |     
  7 |     // Sound properties
  8 |     let correctSound = SKAction.playSoundFileNamed("correct.wav", waitForCompletion: false)
  9 |     let wrongSound = SKAction.playSoundFileNamed("wrong.wav", waitForCompletion: false)
 10 |     let backgroundLoop = SKAudioNode(fileNamed: "loop.wav")
 11 |     
 12 |     // Properties tracking the incorrect node
 13 |     var selectedNode : Node?
 14 |     var currentRandomSkewedValue: Int?
 15 |     var currentRandomOriginalValue: Int?
 16 |     
 17 |     // Properties tracking all visible BST sprites
 18 |     var currentNodes = [Node]()
 19 |     var currentEdges = [SKShapeNode]()
 20 |     
 21 |     // Properties referencing misc. game nodes
 22 |     var background = SKSpriteNode(imageNamed: "background.png")
 23 |     var countdownNode = SKLabelNode(fontNamed: "Arial")
 24 |     var scoreNode = SKLabelNode(fontNamed: "Arial")
 25 |     
 26 |     // Variables to track time, score, and update their nodes when changed
 27 |     var countdownValue: Int = 60 {
 28 |         didSet {
 29 |             countdownNode.text = "Time left: \(countdownValue)"
 30 |         }
 31 |     }
 32 |     
 33 |     var score: Int = 0 {
 34 |         didSet {
 35 |             scoreNode.text = "Score: \(score)"
 36 |         }
 37 |     }
 38 |     
 39 |     // =====================================
 40 |     // =====================================
 41 |     override public func didMove(to view: SKView) {
 42 |         
 43 |         // Load first level
 44 |         presentNextLevel()
 45 |         
 46 |         // Add background image to scene as a node
 47 |         background.position = CGPoint(x: frame.size.width / 2, y: frame.size.height / 2)
 48 |         background.scale(to: self.size)
 49 |         addChild(background)
 50 |         
 51 |         // Add score label to the scene
 52 |         scoreNode.fontColor = SKColor.white
 53 |         scoreNode.fontSize = 20
 54 |         scoreNode.position = CGPoint(x: (self.scene?.size.width)! - 70, y: 20)
 55 |         scoreNode.text = "Score: \(score)"
 56 |         addChild(scoreNode)
 57 |         
 58 |         // Add countdown timer to the scene
 59 |         countdownNode.fontColor = SKColor.white
 60 |         countdownNode.fontSize = 20
 61 |         countdownNode.position = CGPoint(x: 70, y: 20)
 62 |         countdownNode.text = "Time left: \(countdownValue)"
 63 |         addChild(countdownNode)
 64 |         
 65 |         // Run game sound loop forever
 66 |         backgroundLoop.run(SKAction.changeVolume(to: Float(0.9), duration: 0))
 67 |         self.addChild(backgroundLoop)
 68 |         
 69 |         // Create SKAction to decrement the time remaining every second
 70 |         let wait = SKAction.wait(forDuration: 1.0)
 71 |         let block = SKAction.run({ [unowned self] in
 72 |             
 73 |             if self.countdownValue > 0 {
 74 |                 self.countdownValue -= 1
 75 |             } else {
 76 |                 self.gameOver(score: self.score)
 77 |             }
 78 |         })
 79 |         
 80 |         let sequence = SKAction.sequence([wait,block])
 81 |         run(SKAction.repeatForever(sequence), withKey: "countdown")
 82 |     }
 83 |     
 84 |     // =====================================
 85 |     // =====================================
 86 |     func createRandomBST(withCount count: Int) {
 87 |         
 88 |         let nodeCount = Int(NSDecimalNumber(decimal: pow(2, count + 1))) - 1
 89 |         
 90 |         // Choose position of node that will be randomly skewed
 91 |         let randomNodePosition = GKARC4RandomSource().nextInt(upperBound: nodeCount - 1) + 1
 92 |         
 93 |         var array: [Int] = []
 94 |         
 95 |         // Assign random numbers to a temp array
 96 |         for _ in 0..<nodeCount {
 97 |             var rand = Int(arc4random_uniform(100))
 98 |             
 99 |             // If array already has this value, remove duplicate node
100 |             while (array.contains(rand)) {
101 |                 rand = Int(arc4random_uniform(100))
102 |             }
103 |             
104 |             array.append(rand)
105 |         }
106 |         
107 |         // Sort the array in preparation for balancing algorithm
108 |         array.sort()
109 |         
110 |         // Reorder array to distribute as balanced / complete BST, copy back
111 |         let newOrder = sortForCompleteTree(array: array, index: 0)
112 |         for (index, value) in newOrder {
113 |             array[index] = value
114 |         }
115 |         
116 |         // Create BST and insert sequentially with newly balanced array
117 |         let tree = BinarySearchTree(value: array[0])
118 |         for i in 1..<nodeCount {
119 |             tree.insert(value: array[i])
120 |         }
121 |         
122 |         
123 |         // Set skewed value to the value of randomly selected node
124 |         currentRandomOriginalValue = array[randomNodePosition]
125 |         
126 |         // Obtain the tree object for the selected incorrect node
127 |         let nodeToSkew = tree.findNode(value: currentRandomOriginalValue!)
128 |         let parentValue = (nodeToSkew?.parent?.value)!
129 |         
130 |         if (parentValue > currentRandomOriginalValue!) {
131 |             
132 |             // Chosen node it to the left of parent
133 |             // For correctness, we must generate a skewed value greater than the parent
134 |             currentRandomSkewedValue = GKARC4RandomSource().nextInt(upperBound: 99 - parentValue) + (parentValue + 1)
135 |         } else {
136 |             
137 |             // Chosen node is to the right
138 |             // Generate a skewed value that is less than parent to be incorrect
139 |             currentRandomSkewedValue = GKARC4RandomSource().nextInt(upperBound: parentValue - 1) + 1
140 |         }
141 |         
142 |         //print("DEBUG: Generated \(currentRandomSkewedValue!) as next incorrect node")
143 |         
144 |         
145 |         let topHalfView = CGSize(width: self.size.width, height: self.size.height / 2)
146 |         
147 |         self.drawBST(tree: tree,
148 |                      within: topHalfView,
149 |                      at: CGPoint(x: topHalfView.width / 2, y: self.size.height - 80),
150 |                      offset: CGFloat(tree.height()),
151 |                      originalHeight: tree.height())
152 |     }
153 |     
154 |     // =====================================
155 |     // Balance trees with 2^h - 1 nodes
156 |     // =====================================
157 |     func sortForCompleteTree(array: [Int], index: Int) -> [Int : Int] {
158 |         
159 |         var array = array
160 |         let midpoint = array.count / 2
161 |         var result: [Int:Int] = [:]
162 |         
163 |         if (midpoint == 0) {
164 |             return [index: array[midpoint]]
165 |         }
166 |         
167 |         // Divide array in half and call recursively
168 |         let firstHalf = Array(array.prefix(upTo: midpoint))
169 |         let secondHalf = Array(array.suffix(from: midpoint + 1))
170 |         
171 |         // The index of the node must increment based on left and right
172 |         result += sortForCompleteTree(array: firstHalf, index: (index*2) + 1)
173 |         result += sortForCompleteTree(array: secondHalf, index: (2*index) + 2)
174 |         
175 |         // Result will hold key,value pairs corresponding to an array index
176 |         result += [index:array[midpoint]]
177 |         return result
178 |     }
179 |     
180 |     
181 |     
182 |     // MARK: Drawing
183 |     // =====================================
184 |     // =====================================
185 |     public func drawEdge(from pointA: CGPoint, to pointB: CGPoint, width: CGFloat) {
186 |         
187 |         let edgePath  = CGMutablePath()
188 |         edgePath.move(to: CGPoint(x: pointA.x, y: pointA.y))
189 |         edgePath.addLine(to: CGPoint(x: pointB.x, y: pointB.y))
190 |         
191 |         // Create a SKShapeNode to represent the edge as a straight line
192 |         let shape = SKShapeNode()
193 |         shape.path = edgePath
194 |         shape.strokeColor = SKColor.black
195 |         shape.lineWidth = width
196 |         shape.zPosition = 4
197 |         
198 |         self.currentEdges.append(shape)
199 |         addChild(shape)
200 |     }
201 |     
202 |     // =====================================
203 |     // =====================================
204 |     public func drawNode(at point: CGPoint, value: Int, radius: CGFloat, color: SKColor, dynamic: Bool = false) {
205 |         
206 |         // Create Node and set position in scene
207 |         let sprite = Node()
208 |         sprite.setup(value: value, radius: radius, color: color, dynamic: dynamic)
209 |         sprite.position = point
210 |         
211 |         self.currentNodes.append(sprite)
212 |         self.addChild(sprite)
213 |     }
214 |     
215 |     // =====================================
216 |     // =====================================
217 |     public func drawBST(tree: BinarySearchTree, within size: CGSize, at point: CGPoint, offset: CGFloat, originalHeight: Int) {
218 |         
219 |         
220 |         // Use temp placeholders for size and color
221 |         let nodeColor = SKColor.white
222 |         let temp = tree
223 |         
224 |         let nodeRadius = CGFloat(size.width / (2 * pow(2, CGFloat(originalHeight + 1))))
225 |         let spacingWidth = CGFloat(size.width / (2 * pow(2, CGFloat(temp.depth() + 1))))
226 |         let spacingHeight = size.height / CGFloat(originalHeight + 1)
227 |         
228 |         
229 |         // Traverse left branch, decrement x and increment y positions
230 |         if (temp.hasLeftChild) {
231 |             
232 |             // Calculate new point, draw edge between current and new nodes
233 |             let newPoint = CGPoint(x: point.x - spacingWidth, y: point.y - spacingHeight)
234 |             self.drawEdge(from: point, to: newPoint, width: 2)
235 |             
236 |             drawBST(tree: temp.left!,
237 |                     within: size,
238 |                     at: newPoint,
239 |                     offset: (offset - 1),
240 |                     originalHeight: originalHeight)
241 |         }
242 |         
243 |         
244 |         // Traverse right branch, increment x and y positions
245 |         if (temp.hasRightChild) {
246 |             
247 |             // Calculate new point, draw edge between current and new nodes
248 |             let newPoint = CGPoint(x: point.x + spacingWidth, y: point.y - spacingHeight)
249 |             self.drawEdge(from: point, to: newPoint, width: 2)
250 |             
251 |             drawBST(tree: temp.right!,
252 |                     within: size,
253 |                     at: newPoint,
254 |                     offset: (offset - 1),
255 |                     originalHeight: originalHeight)
256 |         }
257 |         
258 |         // If this is the randomly selected node, skew its value
259 |         // Otherwise, add node to the tree
260 |         if (tree.value == currentRandomOriginalValue) {
261 |             
262 |             drawNode(at: point, value: currentRandomSkewedValue!, radius: nodeRadius, color: nodeColor)
263 |             
264 |         } else {
265 |             drawNode(at: point, value: temp.value, radius: nodeRadius, color: nodeColor)
266 |         }
267 |     }
268 |     
269 |     
270 |     // MARK: Game Control
271 |     // =====================================
272 |     // =====================================
273 |     private func gameOver(score: Int) {
274 |         
275 |         // Stop the countdown timer and background music
276 |         self.removeAction(forKey: "countdown")
277 |         self.backgroundLoop.removeFromParent()
278 |         
279 |         if let vc = SLComposeViewController(forServiceType: SLServiceTypeTwitter) {
280 |             vc.add(UIImage(named: "background")!)
281 |             vc.setInitialText("I fixed \(score) Binary Search Trees in 60 seconds in the Tree Trouble Challenge!")
282 |             
283 |             // Extract rootViewController to present the SLComposeViewController (social media posting)
284 |             self.view?.window?.rootViewController?.present(vc, animated: true, completion: nil)
285 |         }
286 |     }
287 |     
288 |     // =====================================
289 |     // =====================================
290 |     private func checkSelection(value: Int) {
291 |         
292 |         // If correct guess, increment score and load next level
293 |         if (currentRandomSkewedValue == value) {
294 |             score += 1
295 |             playSound(sound: correctSound)
296 |             
297 |             // Correct, so load next level
298 |             presentNextLevel()
299 |             return
300 |         }
301 |         
302 |         // At this point the guess was wrong; the challenge is over!
303 |         playSound(sound: wrongSound)
304 |         gameOver(score: score)
305 |     }
306 |     
307 |     // =====================================
308 |     // =====================================
309 |     private func presentNextLevel() {
310 |         
311 |         // Generate random BST height between 2 and 4
312 |         let randomHeight = GKARC4RandomSource().nextInt(upperBound: 3) + 2
313 |         
314 |         // Remove all node and edge sprites from the scene
315 |         for node in currentNodes { node.removeFromParent() }
316 |         for edge in currentEdges { edge.removeFromParent() }
317 |         
318 |         // Remove all references to nodes and edges from the past round
319 |         currentNodes.removeAll()
320 |         currentEdges.removeAll()
321 |         
322 |         createRandomBST(withCount: randomHeight)
323 |     }
324 |     
325 |     // =====================================
326 |     // =====================================
327 |     func playSound(sound : SKAction) {
328 |         run(sound)
329 |     }
330 |     
331 |     // MARK: Touch Handling
332 |     // =====================================
333 |     // =====================================
334 |     override public func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
335 |         
336 |         if let touch = touches.first {
337 |             
338 |             // Extract touch location and all nodes under this point
339 |             let location = touch.location(in: self)
340 |             let touchedNodes = self.nodes(at: location)
341 |             
342 |             if (touchedNodes.isEmpty) { return }
343 |             
344 |             // Check all nodes under point of contact just in case zPosition varies
345 |             for nodeUnderTouch in touchedNodes {
346 |                 
347 |                 // If this is a Node, check its value to determine if correct!
348 |                 if nodeUnderTouch is Node {
349 |                     selectedNode = (nodeUnderTouch as! Node)
350 |                     checkSelection(value: (selectedNode?.value)!)
351 |                 }
352 |             }
353 |         }
354 |     }
355 | }
356 | 
357 | // ================================================
358 | // Convenience function for adding dictionaries
359 | // ================================================
360 | func += <K, V> ( left: inout [K:V], right: [K:V]) {
361 |     for (k, v) in right {
362 |         left.updateValue(v, forKey: k)
363 |     }
364 | }
365 | 


--------------------------------------------------------------------------------
/Tree Trouble.playgroundbook/Contents/Sources/GameView.swift:
--------------------------------------------------------------------------------
  1 | import SpriteKit
  2 | 
  3 | public class GameView: UIViewController {
  4 |     
  5 |     // A container view for the SKScene
  6 |     var gameView: SKView!
  7 |     
  8 |     // =====================================
  9 |     // =====================================
 10 |     public override func viewDidLoad() {
 11 |         
 12 |         // Underlay will take up entire Playground liveView
 13 |         let backgroundView = UIImageView(image: UIImage(named: "underlay.jpg"))
 14 |         backgroundView.isUserInteractionEnabled = true
 15 |         self.view = backgroundView
 16 |         
 17 |         // Setup content view, disable automatic constraints
 18 |         gameView = SKView()
 19 |         gameView.translatesAutoresizingMaskIntoConstraints = false
 20 |         gameView.backgroundColor = UIColor.clear
 21 |         self.view.addSubview(gameView)
 22 |         
 23 |         // These constraints have lower priority, kick in if it can satisfy others
 24 |         let leading = NSLayoutConstraint(item: gameView,
 25 |                                          attribute: .leading,
 26 |                                          relatedBy: .equal,
 27 |                                          toItem: self.view,
 28 |                                          attribute: .leading,
 29 |                                          multiplier: 1.0,
 30 |                                          constant: 0)
 31 |         leading.priority = UILayoutPriority(750.0)
 32 |         
 33 |         let trailing = NSLayoutConstraint(item: gameView,
 34 |                                           attribute: .trailing,
 35 |                                           relatedBy: .equal,
 36 |                                           toItem: self.view,
 37 |                                           attribute: .trailing,
 38 |                                           multiplier: 1.0,
 39 |                                           constant: 0)
 40 |         trailing.priority = UILayoutPriority(750.0)
 41 |         
 42 |         // These constraints have highest priority
 43 |         let centerHorizontally = NSLayoutConstraint(item: gameView,
 44 |                                                     attribute: .centerX,
 45 |                                                     relatedBy: .equal,
 46 |                                                     toItem: self.view,
 47 |                                                     attribute: .centerX,
 48 |                                                     multiplier: 1.0,
 49 |                                                     constant: 0.0)
 50 |         centerHorizontally.priority = UILayoutPriority(1000.0)
 51 |         
 52 |         let centerVertically = NSLayoutConstraint(item: gameView,
 53 |                                                   attribute: .centerY,
 54 |                                                   relatedBy: .equal,
 55 |                                                   toItem: self.view,
 56 |                                                   attribute: .centerY,
 57 |                                                   multiplier: 1.0,
 58 |                                                   constant: 0.0)
 59 |         centerVertically.priority = UILayoutPriority(1000.0)
 60 |         
 61 |         let aspectRatio = NSLayoutConstraint(item: gameView,
 62 |                                              attribute: .height,
 63 |                                              relatedBy: .equal,
 64 |                                              toItem: gameView,
 65 |                                              attribute: .width,
 66 |                                              multiplier: 1.0,
 67 |                                              constant: 0.0)
 68 |         aspectRatio.priority = UILayoutPriority(1000.0)
 69 |         
 70 |         let width = NSLayoutConstraint(item: gameView,
 71 |                                        attribute: .width,
 72 |                                        relatedBy: .lessThanOrEqual,
 73 |                                        toItem: self.view,
 74 |                                        attribute: .width,
 75 |                                        multiplier: 1.0,
 76 |                                        constant: 0.0)
 77 |         width.priority = UILayoutPriority(1000.0)
 78 |         
 79 |         let height = NSLayoutConstraint(item: gameView,
 80 |                                         attribute: .height,
 81 |                                         relatedBy: .lessThanOrEqual,
 82 |                                         toItem: self.view,
 83 |                                         attribute: .height,
 84 |                                         multiplier: 1.0,
 85 |                                         constant: 0.0)
 86 |         height.priority = UILayoutPriority(1000.0)
 87 |         
 88 |         
 89 |         // Add constraints to the view to resize gameView dynamically
 90 |         // These constraints are especially important on the iPad
 91 |         NSLayoutConstraint.activate([leading, trailing, centerVertically, centerHorizontally, aspectRatio, width, height])
 92 |     }
 93 |     
 94 |     // =====================================
 95 |     // =====================================
 96 |     public override func viewDidAppear(_ animated: Bool) {
 97 |         
 98 |         // Scene must be setup after gameView size has been determined
 99 |         let scene = GameScene(size:
100 |             CGSize(
101 |                 width: gameView.frame.size.width,
102 |                 height: gameView.frame.size.height
103 |         ))
104 |         
105 |         // Scene will be identical in size to gameView
106 |         scene.scaleMode = .aspectFit
107 |         self.gameView.presentScene(scene)
108 |     }
109 | }
110 | 


--------------------------------------------------------------------------------
/Tree Trouble.playgroundbook/Contents/Sources/Node.swift:
--------------------------------------------------------------------------------
 1 | import PlaygroundSupport
 2 | import SpriteKit
 3 | 
 4 | class Node: SKSpriteNode {
 5 |     
 6 |     // Each node requires a publicly accessible value
 7 |     public var value: Int!
 8 |     
 9 |     // =====================================
10 |     // =====================================
11 |     func setup(value: Int, radius: CGFloat, color: SKColor, dynamic: Bool = false) {
12 |         
13 |         self.value = value
14 |         
15 |         // Draw a circle
16 |         let circle = SKShapeNode(circleOfRadius: radius)
17 |         circle.strokeColor = SKColor.black
18 |         circle.lineWidth = 2
19 |         circle.fillColor = color
20 |         
21 |         // Establish the text (number value) of the Node
22 |         let text = SKLabelNode(text: String(value))
23 |         text.position = circle.position
24 |         text.horizontalAlignmentMode = .center
25 |         text.verticalAlignmentMode = .center
26 |         text.fontColor = SKColor.black
27 |         text.fontName = "Arial"
28 |         text.fontSize = CGFloat(radius)
29 |         
30 |         // Establish the physicsBody to determine how it reacts to gravity
31 |         self.physicsBody = SKPhysicsBody(circleOfRadius: radius)
32 |         self.physicsBody!.allowsRotation = true
33 |         self.physicsBody!.friction = 0
34 |         self.physicsBody!.linearDamping = 0
35 |         self.physicsBody!.restitution = 0.7
36 |         self.physicsBody!.affectedByGravity = dynamic
37 |         
38 |         // Z-position will be above edges, background
39 |         self.zPosition = 5
40 |         
41 |         // Layer the text and circle node into this NodeSprite
42 |         self.addChild(circle)
43 |         self.addChild(text)
44 |     }
45 | }
46 | 


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