├── FurrySketch.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── simongladman.xcuserdatad
    │       └── xcschemes
    │           ├── FurrySketch.xcscheme
    │           └── xcschememanagement.plist
├── FurrySketch
    ├── AppDelegate.swift
    ├── Assets.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Base.lproj
    │   ├── LaunchScreen.storyboard
    │   └── Main.storyboard
    ├── Info.plist
    ├── ViewController.swift
    └── assets
    │   └── furry.jpg
└── README.md


/FurrySketch.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/FurrySketch/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  FurrySketch
 4 | //
 5 | //  Created by Simon Gladman on 25/11/2015.
 6 | //  Copyright © 2015 Simon Gladman. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 |     var window: UIWindow?
15 | 
16 | 
17 |     func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
18 |         // Override point for customization after application launch.
19 |         return true
20 |     }
21 | 
22 |     func applicationWillResignActive(application: UIApplication) {
23 |         // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
24 |         // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
25 |     }
26 | 
27 |     func applicationDidEnterBackground(application: UIApplication) {
28 |         // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
29 |         // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
30 |     }
31 | 
32 |     func applicationWillEnterForeground(application: UIApplication) {
33 |         // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
34 |     }
35 | 
36 |     func applicationDidBecomeActive(application: UIApplication) {
37 |         // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
38 |     }
39 | 
40 |     func applicationWillTerminate(application: UIApplication) {
41 |         // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
42 |     }
43 | 
44 | 
45 | }
46 | 
47 | 


--------------------------------------------------------------------------------
/FurrySketch/Assets.xcassets/AppIcon.appiconset/Contents.json:
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 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "ipad",
 5 |       "size" : "29x29",
 6 |       "scale" : "1x"
 7 |     },
 8 |     {
 9 |       "idiom" : "ipad",
10 |       "size" : "29x29",
11 |       "scale" : "2x"
12 |     },
13 |     {
14 |       "idiom" : "ipad",
15 |       "size" : "40x40",
16 |       "scale" : "1x"
17 |     },
18 |     {
19 |       "idiom" : "ipad",
20 |       "size" : "40x40",
21 |       "scale" : "2x"
22 |     },
23 |     {
24 |       "idiom" : "ipad",
25 |       "size" : "76x76",
26 |       "scale" : "1x"
27 |     },
28 |     {
29 |       "idiom" : "ipad",
30 |       "size" : "76x76",
31 |       "scale" : "2x"
32 |     }
33 |   ],
34 |   "info" : {
35 |     "version" : 1,
36 |     "author" : "xcode"
37 |   }
38 | }


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/FurrySketch/Base.lproj/LaunchScreen.storyboard:
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 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8150" systemVersion="15A204g" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8122"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="EHf-IW-A2E">
 9 |             <objects>
10 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <animations/>
19 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
20 |                     </view>
21 |                 </viewController>
22 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
23 |             </objects>
24 |             <point key="canvasLocation" x="53" y="375"/>
25 |         </scene>
26 |     </scenes>
27 | </document>
28 | 


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/FurrySketch/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6211" systemVersion="14A298i" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6204"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="tne-QT-ifu">
 9 |             <objects>
10 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="target" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
19 |                     </view>
20 |                 </viewController>
21 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
22 |             </objects>
23 |         </scene>
24 |     </scenes>
25 | </document>
26 | 


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/FurrySketch/Info.plist:
--------------------------------------------------------------------------------
 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>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleSignature</key>
20 | 	<string>????</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | 	<key>LSRequiresIPhoneOS</key>
24 | 	<true/>
25 | 	<key>UILaunchStoryboardName</key>
26 | 	<string>LaunchScreen</string>
27 | 	<key>UIMainStoryboardFile</key>
28 | 	<string>Main</string>
29 | 	<key>UIRequiredDeviceCapabilities</key>
30 | 	<array>
31 | 		<string>armv7</string>
32 | 	</array>
33 | 	<key>UISupportedInterfaceOrientations~ipad</key>
34 | 	<array>
35 | 		<string>UIInterfaceOrientationPortrait</string>
36 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
37 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
38 | 		<string>UIInterfaceOrientationLandscapeRight</string>
39 | 	</array>
40 | </dict>
41 | </plist>
42 | 


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/FurrySketch/ViewController.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  ViewController.swift
  3 | //  FurrySketch
  4 | //
  5 | //  Created by Simon Gladman on 25/11/2015.
  6 | //  Copyright © 2015 Simon Gladman. All rights reserved.
  7 | //
  8 | 
  9 | 
 10 | import UIKit
 11 | 
 12 | class ViewController: UIViewController
 13 | {
 14 |     
 15 |     let halfPi = CGFloat(M_PI_2)
 16 |     let imageView = UIImageView()
 17 |     let compositeFilter = CIFilter(name: "CISourceOverCompositing")!
 18 |     
 19 |     let slider = UISlider()
 20 |     var hue = CGFloat(0)
 21 |     
 22 |     lazy var imageAccumulator: CIImageAccumulator =
 23 |     {
 24 |         [unowned self] in
 25 |         return CIImageAccumulator(extent: self.view.frame, format: kCIFormatARGB8)
 26 |         }()
 27 |     
 28 |     override func viewDidLoad()
 29 |     {
 30 |         super.viewDidLoad()
 31 |         
 32 |         slider.maximumValue = 1
 33 |         slider.addTarget(self, action: "sliderChangeHandler", forControlEvents: .ValueChanged)
 34 |         
 35 |         view.addSubview(imageView)
 36 |         view.addSubview(slider)
 37 |         
 38 |         view.backgroundColor =  UIColor.blackColor()
 39 |         
 40 |         sliderChangeHandler()
 41 |     }
 42 |     
 43 |     func sliderChangeHandler()
 44 |     {
 45 |         hue = CGFloat(slider.value)
 46 |         
 47 |         slider.minimumTrackTintColor = color
 48 |         slider.maximumTrackTintColor = color
 49 |         slider.thumbTintColor = color
 50 |     }
 51 |     
 52 |     var color: UIColor
 53 |         {
 54 |             return UIColor(hue: hue, saturation: 1, brightness: 1, alpha: 1)
 55 |     }
 56 |     
 57 |     override func motionBegan(motion: UIEventSubtype, withEvent event: UIEvent?)
 58 |     {
 59 |         if motion == UIEventSubtype.MotionShake
 60 |         {
 61 |             imageAccumulator.clear()
 62 |             imageAccumulator.setImage(CIImage(color: CIColor(string: "00000000")))
 63 |             
 64 |             imageView.image = nil
 65 |         }
 66 |     }
 67 |     
 68 |     override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?)
 69 |     {
 70 |         guard let
 71 |             touch = touches.first,
 72 |             coalescedTouces = event?.coalescedTouchesForTouch(touch) where
 73 |             touch.type == UITouchType.Stylus else
 74 |         {
 75 |             return
 76 |         }
 77 |         
 78 |         UIGraphicsBeginImageContext(view.frame.size)
 79 |         
 80 |         let cgContext = UIGraphicsGetCurrentContext()
 81 |         
 82 |         CGContextSetLineWidth(cgContext, 1)
 83 |         
 84 |         CGContextSetStrokeColorWithColor(cgContext, color.colorWithAlphaComponent(0.025).CGColor)
 85 |         
 86 |         for coalescedTouch in coalescedTouces
 87 |         {
 88 |             let touchLocation = coalescedTouch.locationInView(view)
 89 |             
 90 |             let normalisedAlititudeAngle =  (halfPi - touch.altitudeAngle) / halfPi
 91 |             let dx = coalescedTouch.azimuthUnitVectorInView(view).dx * 20 * normalisedAlititudeAngle
 92 |             let dy = coalescedTouch.azimuthUnitVectorInView(view).dy * 20 * normalisedAlititudeAngle
 93 |             
 94 |             let count = 10 + Int((coalescedTouch.force / coalescedTouch.maximumPossibleForce) * 100)
 95 |             
 96 |             for _ in 0 ... count
 97 |             {
 98 |                 let randomAngle = drand48() * (M_PI * 2)
 99 |                 
100 |     let innerRandomRadius = drand48() * 20
101 |     let innerRandomX = CGFloat(sin(randomAngle) * innerRandomRadius)
102 |     let innerRandomY = CGFloat(cos(randomAngle) * innerRandomRadius)
103 |                 
104 |     let outerRandomRadius = innerRandomRadius + drand48() * 40 * Double(normalisedAlititudeAngle)
105 |     let outerRandomX = CGFloat(sin(randomAngle) * outerRandomRadius) - dx
106 |     let outerRandomY = CGFloat(cos(randomAngle) * outerRandomRadius) - dy
107 |                 
108 |     CGContextMoveToPoint(cgContext,
109 |         touchLocation.x + innerRandomX,
110 |         touchLocation.y + innerRandomY)
111 |     
112 |     CGContextAddLineToPoint(cgContext,
113 |         touchLocation.x + outerRandomX,
114 |         touchLocation.y + outerRandomY)
115 |     
116 |     CGContextStrokePath(cgContext)
117 |             }
118 |         }
119 |         
120 |     let drawnImage = UIGraphicsGetImageFromCurrentImageContext()
121 |     
122 |     UIGraphicsEndImageContext()
123 |     
124 |     compositeFilter.setValue(CIImage(image: drawnImage),
125 |         forKey: kCIInputImageKey)
126 |     compositeFilter.setValue(imageAccumulator.image(),
127 |         forKey: kCIInputBackgroundImageKey)
128 |     
129 |     imageAccumulator.setImage(compositeFilter.valueForKey(kCIOutputImageKey) as! CIImage)
130 |     
131 |     imageView.image = UIImage(CIImage: imageAccumulator.image())
132 |     }
133 |     
134 |     override func viewDidLayoutSubviews()
135 |     {
136 |         imageView.frame = view.bounds
137 |         
138 |         slider.frame = CGRect(x: 0,
139 |             y: view.frame.height - slider.intrinsicContentSize().height - 20,
140 |             width: view.frame.width,
141 |             height: slider.intrinsicContentSize().height).insetBy(dx: 20, dy: 0)
142 |     }
143 | }


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/FurrySketch/assets/furry.jpg:
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https://raw.githubusercontent.com/FlexMonkey/FurrySketch/2cfcfdd4e495179428f942e217f04628e075ee21/FurrySketch/assets/furry.jpg


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/README.md:
--------------------------------------------------------------------------------
 1 | # FurrySketch
 2 | ##### Using Apple Pencil's Azimuth &amp; Altitude Data for Creating Furry Brush Strokes
 3 | 
 4 | ##### _Companion project to this blog post: http://flexmonkey.blogspot.co.uk/2015/11/furrysketch-hirsute-drawing-with-apple.html_
 5 | 
 6 | ![image](/FurrySketch/assets/furry.jpg)
 7 | 
 8 | 
 9 | After my recent experiments (mis)using my Apple Pencil for nefarious and alternative uses, I thought it was about time to play with the Pencil for its intended purpose, sketching, and see how I could use its orientation data to affect brush strokes. 
10 | 
11 | FurrySketch is a Pencil powered drawing application that draws a sort of multicoloured hair and, most excitingly, the hair's direction matches the angle of the Pencil. It was super simple to write and, at least in my opinion, gives really nice results.
12 | 
13 | The basic mechanics are lifted from my ForceSketch project: I use a `CIImageAccumulator` with each new bitmap (created inside `touchesMoved`) composited over the previously accumulated images with a Core Image `CISourceOverCompositing` filter.  
14 | 
15 | The interesting part for Pencil fans is creating the hairy brush strokes:
16 | 
17 | ## Hirsute Brush Mechanics
18 | 
19 | Inside `touchesMoved`, I loop over the coalesced touches (you can read about coalesced touches in my Advanced Touch Handling blog post). For each of the intermediate touches, I want to find its location in the view, its altitude angle and its azimuth vector. This vector points in the direction of the Pencil's azimuth angle and by multiplying it with the normalised altitude angle, I get an offset I can use when drawing my little hairs:
20 | 
21 | ```swift
22 |     for coalescedTouch in coalescedTouces
23 |     {
24 |         let touchLocation = coalescedTouch.locationInView(view)
25 |         
26 |         let normalisedAlititudeAngle =  (halfPi - touch.altitudeAngle) / halfPi
27 |         let dx = coalescedTouch.azimuthUnitVectorInView(view).dx * 20 * normalisedAlititudeAngle
28 |         let dy = coalescedTouch.azimuthUnitVectorInView(view).dy * 20 * normalisedAlititudeAngle
29 | ```
30 | 
31 | I then use the touch's force to decide how many hairs to draw...
32 | 
33 | ```swift
34 |     let count = 10 + Int((coalescedTouch.force / coalescedTouch.maximumPossibleForce) * 100)
35 | ```
36 | 
37 | Now I iterate `count` times. With each iteration, I create a random angle and create constants for the inner radius and start point for each hair:
38 | 
39 | ```swift
40 |     let innerRandomRadius = drand48() * 20
41 |     let innerRandomX = CGFloat(sin(randomAngle) * innerRandomRadius)
42 | 
43 |     let innerRandomY = CGFloat(cos(randomAngle) * innerRandomRadius)
44 | ```
45 | 
46 | Although the start point of the hair isn't affected by the Pencil's orientation, the end point is. Here, I create another, larger, random radius, use the same angle and offset the end point by dx and dy I created above:
47 | 
48 | ```swift
49 |     randomRadius = innerRandomRadius + drand48() * 40 * Double(normalisedAlititudeAngle)
50 |     
51 |     let outerRandomX = CGFloat(sin(randomAngle) * outerRandomRadius) - dx
52 |     let outerRandomY = CGFloat(cos(randomAngle) * outerRandomRadius) - dy
53 | ```
54 | 
55 | With those values, I can draw the hairs to my context and repeat over:
56 | 
57 | ```swift
58 |     CGContextMoveToPoint(cgContext,
59 |         touchLocation.x + innerRandomX,
60 |         touchLocation.y + innerRandomY)
61 |     
62 |     CGContextAddLineToPoint(cgContext,
63 |         touchLocation.x + outerRandomX,
64 |         touchLocation.y + outerRandomY)
65 |     
66 |     CGContextStrokePath(cgContext)
67 | ```    
68 | 
69 | A quick reminder on `CIImageAccumulator`: once the big, hairy loop is finished, I can get the newly generated image from the context and use the `CISourceOverCompositing` filter to composite that image for that touch move over the previous and finally display it in an `UIImageView`:
70 | 
71 | ```swift
72 |     let drawnImage = UIGraphicsGetImageFromCurrentImageContext()
73 |     
74 |     UIGraphicsEndImageContext()
75 |     
76 |     compositeFilter.setValue(CIImage(image: drawnImage),
77 |         forKey: kCIInputImageKey)
78 |     compositeFilter.setValue(imageAccumulator.image(),
79 |         forKey: kCIInputBackgroundImageKey)
80 |     
81 |     imageAccumulator.setImage(compositeFilter.valueForKey(kCIOutputImageKey) as! CIImage)
82 |     
83 |     imageView.image = UIImage(CIImage: imageAccumulator.image())
84 | ```
85 | 
86 | ## In Conclusion
87 | 
88 | If you are writing drawing apps, adding Pencil support is not only super easy, it adds real value for your users. The technique I've used here to draw hair is only a few lines of code way from spray cans and air brushes and I genuinely believe the iPad Pro will prove to be an amazing device for creatives.
89 | 


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