Repository: Awalz/SwiftyDraw
Branch: master
Commit: dab0f3295187
Files: 29
Total size: 106.6 KB

Directory structure:
gitextract_rxluaobk/

├── LICENSE
├── Package.swift
├── README.md
├── Source/
│   ├── Brush.swift
│   ├── Color.swift
│   └── SwiftyDraw.swift
├── SwiftyDraw/
│   ├── Info.plist
│   └── SwiftyDraw.h
├── SwiftyDraw.podspec
├── SwiftyDraw.xcodeproj/
│   ├── project.pbxproj
│   ├── project.xcworkspace/
│   │   ├── contents.xcworkspacedata
│   │   ├── xcshareddata/
│   │   │   └── IDEWorkspaceChecks.plist
│   │   └── xcuserdata/
│   │       ├── darrenjones.xcuserdatad/
│   │       │   └── UserInterfaceState.xcuserstate
│   │       └── shunzhema.xcuserdatad/
│   │           └── UserInterfaceState.xcuserstate
│   ├── xcshareddata/
│   │   └── xcschemes/
│   │       └── SwiftyDraw.xcscheme
│   └── xcuserdata/
│       └── shunzhema.xcuserdatad/
│           └── xcschemes/
│               └── xcschememanagement.plist
└── SwiftyDrawExample/
    ├── .gitignore
    ├── SwiftyDrawExample/
    │   ├── AppDelegate.swift
    │   ├── Assets.xcassets/
    │   │   └── AppIcon.appiconset/
    │   │       └── Contents.json
    │   ├── Base.lproj/
    │   │   ├── LaunchScreen.storyboard
    │   │   └── Main.storyboard
    │   ├── Extensions.swift
    │   ├── Info.plist
    │   ├── SwiftyDrawExample.entitlements
    │   └── ViewController.swift
    └── SwiftyDrawExample.xcodeproj/
        ├── project.pbxproj
        ├── project.xcworkspace/
        │   ├── contents.xcworkspacedata
        │   └── xcshareddata/
        │       └── IDEWorkspaceChecks.plist
        └── xcshareddata/
            └── xcschemes/
                └── SwiftyDrawExample.xcscheme

================================================
FILE CONTENTS
================================================

================================================
FILE: LICENSE
================================================
Copyright (c) 2018 Linus Geffarth <hello@ogli.codes>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.


================================================
FILE: Package.swift
================================================
// swift-tools-version:5.3

import PackageDescription

let package = Package(
    name: "SwiftyDraw",
    platforms: [
        .iOS(.v9)
    ],
    products: [
        .library(name: "SwiftyDraw", targets: ["SwiftyDraw"])
    ],
    targets: [
        .target(name: "SwiftyDraw", path: "Source")
    ]
)


================================================
FILE: README.md
================================================
<h1 align="center">SwiftyDraw</h1>

<p align="center">
    <img src="https://img.shields.io/badge/platform-iOS%209%2B-blue.svg?style=flat" alt="Platform: iOS 9.1+"/>
    <a href="https://developer.apple.com/swift"><img src="https://img.shields.io/badge/language-swift%205-4BC51D.svg?style=flat" alt="Language: Swift 5" /></a>
    <a href="https://cocoapods.org/pods/SwiftyDraw"><img src="https://img.shields.io/cocoapods/v/SwiftyDraw.svg?style=flat" alt="CocoaPods" /></a>
    <img src="http://img.shields.io/badge/license-MIT-lightgrey.svg?style=flat" alt="License: MIT" /> <br><br>
</p>


## Overview

SwiftyDraw is a simple, light-weight drawing framework written in Swift. SwiftyDraw is built using Core Gaphics and is very easy to implement.

## Requirements
* iOS 9.1+
* Swift 5.0

## Installation

### Cocoapods:

SwiftyDraw is available through [CocoaPods](http://cocoapods.org). To install
it, add the following line to your Podfile:

```ruby
pod 'SwiftyDraw'
```

### Carthage

SwiftyDraw is also available through [Carthage](https://github.com/Carthage/Carthage/blob/master/README.md). To install, add the following line to your Cartfile:

```ruby
github "awalz/SwiftyDraw" "master"
```

### Manual Installation:

Simply copy the contents of the Source folder into your project.

## Usage

Using SwiftyDraw is very simple:

### Getting Started:

Create a SwiftyDrawView and add it to your ViewController:

```swift
let drawView = SwiftyDrawView(frame: self.view.frame)
self.view.addSubview(drawView)
```

By default, the view will automatically respond to touch gestures and begin drawing. The default brush is `.default`, which has a **black** color.

To disable drawing, simply set the `isEnabled` property to `false`:

```swift
drawView.isEnabled = false
```

## Brushes

For drawing, we use `Brush` to keep track of styles like `width`, `color`, etc.. We have multiple different default brushes, you can use as follows:

```swift
drawView.brush = Brush.default
```

The default brushed are:

```swift
public static var `default`: Brush { get } // black, width 3
public static var thin     : Brush { get } // black, width 2
public static var medium   : Brush { get } // black, width 7
public static var thick    : Brush { get } // black, width 10
public static var marker   : Brush { get } // flat red-ish, width 10
public static var eraser   : Brush { get } // clear, width 8; uses CGBlendMode to erase things
```

### Adjusted Width Factor

`SwiftyDrawView` supports drawing-angle-adjusted brushes. This effectively means, if the user (using an Pencil) draws with the tip of the pencil, the brush will reduce its width a little. If the user draws at a very low angle, with the side of the pencil, the brush will be a little thicker.
You can modify this behavior by setting `adjustedWidthFactor` of a brush. If you increase the number (to, say, `5`) the changes will increase. If you reduce the number to `0`, the width will not be adjusted at all.
The default value is `1` which causes a slight de-/increase in width.

This is an opt-in feature. That means, in `shouldBeginDrawingIn`, you need to call `drawingView.brush.adjustWidth(for: touch)`.

## Further Customization:

For more customization, you can modify the different properties of a brush to fit your needs.

### Line Color:

The color of a line stroke can be changed by adjusting the `color` property of a brush. SwiftyDraw accepts any `Color`:

```swift
drawView.brush.color = Color(.red)
```
    
<p align="center">
  or
</p>

```swift
drawView.brush.color = Color(UIColor(colorLiteralRed: 0.75, green: 0.50, blue: 0.88, alpha: 1.0))
```

We have our own implementation of `UIColor` – `Color` – to be able to de-/encode it.

### Line Width:

The width of a line stroke can be changed by adjusting the `width` property of a brush. SwiftyDraw accepts any positive `CGFloat`:

```swift
drawView.brush.width = 5.0
```

### Line Opacity:

The opacity of a line stroke can be changed by adjusting the `lineOpacity` property. SwiftyDraw accepts any `CGFloat` between `0` and `1`:

```swift
drawView.brush.opacity = 0.5
```
    
## Editing

### Clear All:

If you wish to clear the entire canvas, simply call the `clear` function:

```swift
drawView.clear()
``` 

### Drawing History:

```swift
drawView.undo()
``` 

...and redo:

```swift
drawView.redo()
``` 

To en-/disable custom un- & redo buttons, you can use `.canUndo` and `.canRedo`.

## Apple Pencil Integration
Apple Pencil can be used for drawing in a SwiftyDrawView, just like a finger.  
Special features, however, regarding Apple Pencil 2 are only supported on iOS 12.1 and above versions.

### Apple Pencil 2 Double Tap action
#### Enable/ Disable pencil interaction
Apple Pencil interaction is enabled by default, but you can set `drawView.isPencilInteractive` to change that setting.
#### Pencil Events
When double tapping the pencil, SwiftyDraw will check the user preferences set in the system. If the preference is set to switch to eraser, SwiftyDraw will switch between normal and erasing mode; if set to last used tool, SwiftyDraw will switch between current and previous brush.

## Delegate

SwiftyDraw has delegate functions to notify you when a user is interacting with a SwiftDrawView. To access these delegate methods, have your View Controller conform to the `SwiftyDrawViewDelegate` protocol:

```swift
class ViewController: UIViewController, SwiftyDrawViewDelegate
```

### Delegate methods

```swift
func swiftyDraw(shouldBeginDrawingIn drawingView: SwiftyDrawView, using touch: UITouch) -> Bool

func swiftyDraw(didBeginDrawingIn drawingView: SwiftyDrawView, using touch: UITouch)

func swiftyDraw(isDrawingIn drawingView: SwiftyDrawView, using touch: UITouch)
    
func swiftyDraw(didFinishDrawingIn drawingView: SwiftyDrawView, using touch: UITouch)
    
func swiftyDraw(didCancelDrawingIn drawingView: SwiftyDrawView, using touch: UITouch)
```

---
 
## Contribution

This project was built by [Awalz](https://github.com/Awalz) and is mostly maintained & improved by [LinusGeffarth](https://github.com/LinusGeffarth).

If you'd like to propose any enhancements, bug fixes, etc., feel free to create a pull request or an issue respectively.

### Contact

If you have any questions, or just want to say *Hi!*, you can reach me via [Twitter](https://twitter.com/linusgeffarth), or [email](mailto:linus@geffarth.com).

### LICENSE

SwiftyDraw is available under the MIT license. See the LICENSE file for more info.


================================================
FILE: Source/Brush.swift
================================================
//
//  Brush.swift
//  Sketch
//
//  Created by Linus Geffarth on 02.05.18.
//  Copyright © 2018 Linus Geffarth. All rights reserved.
//

import UIKit

public class Brush: Codable {
    
    public var color: Color
    /// Original brush width set when initializing the brush. Not affected by updating the brush width. Used to determine adjusted width
    private var _originalWidth: CGFloat
    /// Original brush width set when initializing the brush. Not affected by updating the brush width. Used to determine adjusted width
    public var originalWidth: CGFloat { return _originalWidth }
    public var width: CGFloat
    public var opacity: CGFloat
    
    public var adjustedWidthFactor: CGFloat = 1
    
    /// Allows for actually erasing content, by setting it to `.clear`. Default is `.normal`
    public var blendMode: BlendMode = .normal
    
    public init(color: UIColor = .black, width: CGFloat = 3, opacity: CGFloat = 1, adjustedWidthFactor: CGFloat = 1, blendMode: BlendMode = .normal) {
        self.color = Color(color)
        self._originalWidth = width
        self.width = width
        self.opacity = opacity
        self.adjustedWidthFactor = adjustedWidthFactor
        self.blendMode = blendMode
    }
    
    private func adjustedWidth(for touch: UITouch) -> CGFloat {
        guard #available(iOS 9.1, *), touch.type == .pencil else { return originalWidth }
        return (originalWidth*(1-adjustedWidthFactor/10*2)) + (adjustedWidthFactor/touch.altitudeAngle)
    }
    
    public func adjustWidth(for touch: UITouch) {
        width = adjustedWidth(for: touch)
    }
    
    // MARK: - Static brushes
    
    public static var `default`: Brush {
        return Brush(color: .black, width: 3, opacity: 1)
    }
    
    public static var thin: Brush {
        return Brush(color: .black, width: 2, opacity: 1)
    }
    
    public static var medium: Brush {
        return Brush(color: .black, width: 7, opacity: 1)
    }
    
    public static var thick: Brush {
        return Brush(color: .black, width: 12, opacity: 1)
    }
    
    public static var marker: Brush {
        return Brush(color: #colorLiteral(red: 0.920953393, green: 0.447560966, blue: 0.4741248488, alpha: 1), width: 10, opacity: 0.3)
    }
    
    public static var eraser: Brush {
        return Brush(adjustedWidthFactor: 5, blendMode: .clear)
    }
    
    public static var selection: Brush {
        return Brush(color: .clear, width: 1, opacity: 1)
    }
}

extension Brush: Equatable, Comparable, CustomStringConvertible {
    
    public static func ==(lhs: Brush, rhs: Brush) -> Bool {
        return (
          lhs.color.uiColor == rhs.color.uiColor &&
                lhs.originalWidth == rhs.originalWidth &&
                lhs.opacity == rhs.opacity
        )
    }
    
    public static func <(lhs: Brush, rhs: Brush) -> Bool {
        return (
            lhs.width < rhs.width
        )
    }
    
    public var description: String {
        return "<Brush: color: \(color), width: (original: \(originalWidth), current: \(width)), opacity: \(opacity)>"
    }
}


================================================
FILE: Source/Color.swift
================================================
//
//  Color.swift
//  SwiftyDrawExample
//
//  Created by Linus Geffarth on 17.04.19.
//  Copyright © 2019 Walzy. All rights reserved.
//

import UIKit

public struct Color : Codable {
    private var red: CGFloat = 0.0
    private var green: CGFloat = 0.0
    private var blue: CGFloat = 0.0
    private var alpha: CGFloat = 0.0

    public var uiColor: UIColor {
        UIColor(red: red, green: green, blue: blue, alpha: alpha)
    }

    public init(_ uiColor: UIColor) {
        uiColor.getRed(&red, green: &green, blue: &blue, alpha: &alpha)
    }
}

public enum BlendMode: String, Codable {
    case normal = "normal"
    case clear = "clear"
    
    var cgBlendMode: CGBlendMode {
        switch self {
        case .normal:
            return .normal
        case .clear:
            return .clear
        }
    }
}


================================================
FILE: Source/SwiftyDraw.swift
================================================
/*Copyright (c) 2016, Andrew Walz.
 
 Redistribution and use in source and binary forms, with or without modification,are permitted provided that the following conditions are met:
 
 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

import UIKit

// MARK: - Public Protocol Declarations

/// SwiftyDrawView Delegate
@objc public protocol SwiftyDrawViewDelegate: AnyObject {
    
    /**
     SwiftyDrawViewDelegate called when a touch gesture should begin on the SwiftyDrawView using given touch type
     
     - Parameter view: SwiftyDrawView where touches occured.
     - Parameter touchType: Type of touch occuring.
     */
    func swiftyDraw(shouldBeginDrawingIn drawingView: SwiftyDrawView, using touch: UITouch) -> Bool
    /**
     SwiftyDrawViewDelegate called when a touch gesture begins on the SwiftyDrawView.
     
     - Parameter view: SwiftyDrawView where touches occured.
     */
    func swiftyDraw(didBeginDrawingIn drawingView: SwiftyDrawView, using touch: UITouch)
    
    /**
     SwiftyDrawViewDelegate called when touch gestures continue on the SwiftyDrawView.
     
     - Parameter view: SwiftyDrawView where touches occured.
     */
    func swiftyDraw(isDrawingIn drawingView: SwiftyDrawView, using touch: UITouch)
    
    /**
     SwiftyDrawViewDelegate called when touches gestures finish on the SwiftyDrawView.
     
     - Parameter view: SwiftyDrawView where touches occured.
     */
    func swiftyDraw(didFinishDrawingIn drawingView: SwiftyDrawView, using touch: UITouch)
    
    /**
     SwiftyDrawViewDelegate called when there is an issue registering touch gestures on the  SwiftyDrawView.
     
     - Parameter view: SwiftyDrawView where touches occured.
     */
    func swiftyDraw(didCancelDrawingIn drawingView: SwiftyDrawView, using touch: UITouch)
}

/// UIView Subclass where touch gestures are translated into Core Graphics drawing
open class SwiftyDrawView: UIView {
    
    /// Current brush being used for drawing
    public var brush: Brush = .default {
        didSet {
            previousBrush = oldValue
        }
    }
    /// Determines whether touch gestures should be registered as drawing strokes on the current canvas
    public var isEnabled = true

    /// Determines how touch gestures are treated
    /// draw - freehand draw
    /// line - draws straight lines **WARNING:** experimental feature, may not work properly.
    public enum DrawMode { case draw, line, ellipse, rect }
    public var drawMode:DrawMode = .draw
    
    /// Determines whether paths being draw would be filled or stroked.
    public var shouldFillPath = false

    /// Determines whether responde to Apple Pencil interactions, like the Double tap for Apple Pencil 2 to switch tools.
    public var isPencilInteractive : Bool = true {
        didSet {
            if #available(iOS 12.1, *) {
                pencilInteraction.isEnabled  = isPencilInteractive
            }
        }
    }
    /// Public SwiftyDrawView delegate
    @IBOutlet public weak var delegate: SwiftyDrawViewDelegate?
    
    @available(iOS 9.1, *)
    public enum TouchType: Equatable, CaseIterable {
        case finger, pencil
        
        var uiTouchTypes: [UITouch.TouchType] {
            switch self {
            case .finger:
                return [.direct, .indirect]
            case .pencil:
                return [.pencil, .stylus  ]
            }
        }
    }
    /// Determines which touch types are allowed to draw; default: `[.finger, .pencil]` (all)
    @available(iOS 9.1, *)
    public lazy var allowedTouchTypes: [TouchType] = [.finger, .pencil]
    
    public  var drawItems: [DrawItem] = []
    public  var drawingHistory: [DrawItem] = []
    public  var firstPoint: CGPoint = .zero      // created this variable
    public  var currentPoint: CGPoint = .zero     // made public
    private var previousPoint: CGPoint = .zero
    private var previousPreviousPoint: CGPoint = .zero
    
    // For pencil interactions
    @available(iOS 12.1, *)
    lazy private var pencilInteraction = UIPencilInteraction()
    
    /// Save the previous brush for Apple Pencil interaction Switch to previous tool
    private var previousBrush: Brush = .default
    
    public enum ShapeType { case rectangle, roundedRectangle, ellipse }

    public struct DrawItem {
        public var path: CGMutablePath
        public var brush: Brush
        public var isFillPath: Bool
        
        public init(path: CGMutablePath, brush: Brush, isFillPath: Bool) {
            self.path = path
            self.brush = brush
            self.isFillPath = isFillPath
        }
    }
    
    /// Public init(frame:) implementation
    override public init(frame: CGRect) {
        super.init(frame: frame)
        self.backgroundColor = .clear
        // receive pencil interaction if supported
        if #available(iOS 12.1, *) {
            pencilInteraction.delegate = self
            self.addInteraction(pencilInteraction)
        }
    }
    
    /// Public init(coder:) implementation
    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.backgroundColor = .clear
        //Receive pencil interaction if supported
        if #available(iOS 12.1, *) {
            pencilInteraction.delegate = self
            self.addInteraction(pencilInteraction)
        }
    }
    
    /// Overriding draw(rect:) to stroke paths
    override open func draw(_ rect: CGRect) {
        guard let context: CGContext = UIGraphicsGetCurrentContext() else { return }
        
        for item in drawItems {
            context.setLineCap(.round)
            context.setLineJoin(.round)
            context.setLineWidth(item.brush.width)
            context.setBlendMode(item.brush.blendMode.cgBlendMode)
            context.setAlpha(item.brush.opacity)
            if (item.isFillPath)
            {
                context.setFillColor(item.brush.color.uiColor.cgColor)
                context.addPath(item.path)
                context.fillPath()
            }
            else {
                context.setStrokeColor(item.brush.color.uiColor.cgColor)
                context.addPath(item.path)
                context.strokePath()
            }
        }
    }
    
    /// touchesBegan implementation to capture strokes
    override open func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        guard isEnabled, let touch = touches.first else { return }
        if #available(iOS 9.1, *) {
            guard allowedTouchTypes.flatMap({ $0.uiTouchTypes }).contains(touch.type) else { return }
        }
        guard delegate?.swiftyDraw(shouldBeginDrawingIn: self, using: touch) ?? true else { return }
        delegate?.swiftyDraw(didBeginDrawingIn: self, using: touch)
        
        setTouchPoints(touch, view: self)
        firstPoint = touch.location(in: self)
        let newLine = DrawItem(path: CGMutablePath(),
                           brush: Brush(color: brush.color.uiColor, width: brush.width, opacity: brush.opacity, blendMode: brush.blendMode), isFillPath: drawMode != .draw && drawMode != .line ? shouldFillPath : false)
        addLine(newLine)
    }
    
    /// touchesMoves implementation to capture strokes
    override open func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        guard isEnabled, let touch = touches.first else { return }
        if #available(iOS 9.1, *) {
            guard allowedTouchTypes.flatMap({ $0.uiTouchTypes }).contains(touch.type) else { return }
        }
        delegate?.swiftyDraw(isDrawingIn: self, using: touch)
        
        updateTouchPoints(for: touch, in: self)
        
        switch (drawMode) {
        case .line:
            drawItems.removeLast()
            setNeedsDisplay()
            let newLine = DrawItem(path: CGMutablePath(),
                               brush: Brush(color: brush.color.uiColor, width: brush.width, opacity: brush.opacity, blendMode: brush.blendMode), isFillPath: false)
            newLine.path.addPath(createNewStraightPath())
            addLine(newLine)
            break
        case .draw:
            let newPath = createNewPath()
            if let currentPath = drawItems.last {
                currentPath.path.addPath(newPath)
            }
            break
        case .ellipse:
            drawItems.removeLast()
            setNeedsDisplay()
            let newLine = DrawItem(path: CGMutablePath(),
                               brush: Brush(color: brush.color.uiColor, width: brush.width, opacity: brush.opacity, blendMode: brush.blendMode), isFillPath: shouldFillPath)
            newLine.path.addPath(createNewShape(type: .ellipse))
            addLine(newLine)
            break
        case .rect:
            drawItems.removeLast()
            setNeedsDisplay()
            let newLine = DrawItem(path: CGMutablePath(),
                               brush: Brush(color: brush.color.uiColor, width: brush.width, opacity: brush.opacity, blendMode: brush.blendMode), isFillPath: shouldFillPath)
            newLine.path.addPath(createNewShape(type: .rectangle))
            addLine(newLine)
            break
        }
    }
    
    func addLine(_ newLine: DrawItem) {
        drawItems.append(newLine)
        drawingHistory = drawItems // adding a new item should also update history
    }
    
    /// touchedEnded implementation to capture strokes
    override open func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        guard isEnabled, let touch = touches.first else { return }
        delegate?.swiftyDraw(didFinishDrawingIn: self, using: touch)
    }
    
    /// touchedCancelled implementation
    override open func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
        guard isEnabled, let touch = touches.first else { return }
        delegate?.swiftyDraw(didCancelDrawingIn: self, using: touch)
    }
    
    /// Displays paths passed by replacing all other contents with provided paths
    public func display(drawItems: [DrawItem]) {
        self.drawItems = drawItems
        drawingHistory = drawItems
        setNeedsDisplay()
    }
    
    /// Determines whether a last change can be undone
    public var canUndo: Bool {
        return drawItems.count > 0
    }
    
    /// Determines whether an undone change can be redone
    public var canRedo: Bool {
        return drawingHistory.count > drawItems.count
    }
    
    /// Undo the last change
    public func undo() {
        guard canUndo else { return }
        drawItems.removeLast()
        setNeedsDisplay()
    }
    
    /// Redo the last change
    public func redo() {
        guard canRedo, let line = drawingHistory[safe: drawItems.count] else { return }
        drawItems.append(line)
        setNeedsDisplay()
    }
    
    /// Clear all stroked lines on canvas
    public func clear() {
        drawItems = []
        setNeedsDisplay()
    }
    
    /********************************** Private Functions **********************************/
    
    private func setTouchPoints(_ touch: UITouch,view: UIView) {
        previousPoint = touch.previousLocation(in: view)
        previousPreviousPoint = touch.previousLocation(in: view)
        currentPoint = touch.location(in: view)
    }
    
    private func updateTouchPoints(for touch: UITouch,in view: UIView) {
        previousPreviousPoint = previousPoint
        previousPoint = touch.previousLocation(in: view)
        currentPoint = touch.location(in: view)
    }
    
    private func createNewPath() -> CGMutablePath {
        let midPoints = getMidPoints()
        let subPath = createSubPath(midPoints.0, mid2: midPoints.1)
        let newPath = addSubPathToPath(subPath)
        return newPath
    }
    
    private func createNewStraightPath() -> CGMutablePath {
        let pt1 : CGPoint = firstPoint
        let pt2 : CGPoint = currentPoint
        let subPath = createStraightSubPath(pt1, mid2: pt2)
        let newPath = addSubPathToPath(subPath)
        return newPath
    }
    
    private func createNewShape(type :ShapeType, corner:CGPoint = CGPoint(x: 1.0, y: 1.0)) -> CGMutablePath {
        let pt1 : CGPoint = firstPoint
        let pt2 : CGPoint = currentPoint
        let width = abs(pt1.x - pt2.x)
        let height = abs(pt1.y - pt2.y)
        let newPath = CGMutablePath()
        if width > 0, height > 0 {
            let bounds = CGRect(x: min(pt1.x, pt2.x), y: min(pt1.y, pt2.y), width: width, height: height)
            switch (type) {
            case .ellipse:
                newPath.addEllipse(in: bounds)
                break
            case .rectangle:
                newPath.addRect(bounds)
                break
            case .roundedRectangle:
                newPath.addRoundedRect(in: bounds, cornerWidth: corner.x, cornerHeight: corner.y)
            }
        }
        return addSubPathToPath(newPath)
    }
    
    private func calculateMidPoint(_ p1 : CGPoint, p2 : CGPoint) -> CGPoint {
        return CGPoint(x: (p1.x + p2.x) * 0.5, y: (p1.y + p2.y) * 0.5);
    }
    
    private func getMidPoints() -> (CGPoint,  CGPoint) {
        let mid1 : CGPoint = calculateMidPoint(previousPoint, p2: previousPreviousPoint)
        let mid2 : CGPoint = calculateMidPoint(currentPoint, p2: previousPoint)
        return (mid1, mid2)
    }
    
    private func createSubPath(_ mid1: CGPoint, mid2: CGPoint) -> CGMutablePath {
        let subpath : CGMutablePath = CGMutablePath()
        subpath.move(to: CGPoint(x: mid1.x, y: mid1.y))
        subpath.addQuadCurve(to: CGPoint(x: mid2.x, y: mid2.y), control: CGPoint(x: previousPoint.x, y: previousPoint.y))
        return subpath
    }
    
    private func createStraightSubPath(_ mid1: CGPoint, mid2: CGPoint) -> CGMutablePath {
        let subpath : CGMutablePath = CGMutablePath()
        subpath.move(to: mid1)
        subpath.addLine(to: mid2)
        return subpath
    }
    
    private func addSubPathToPath(_ subpath: CGMutablePath) -> CGMutablePath {
        let bounds : CGRect = subpath.boundingBox
        let drawBox : CGRect = bounds.insetBy(dx: -2.0 * brush.width, dy: -2.0 * brush.width)
        self.setNeedsDisplay(drawBox)
        return subpath
    }
}

// MARK: - Extensions

extension Collection {
    /// Returns the element at the specified index if it is within bounds, otherwise nil.
    subscript (safe index: Index) -> Element? {
        return indices.contains(index) ? self[index] : nil
    }
}

@available(iOS 12.1, *)
extension SwiftyDrawView : UIPencilInteractionDelegate{
    public func pencilInteractionDidTap(_ interaction: UIPencilInteraction) {
        let preference = UIPencilInteraction.preferredTapAction
        if preference == .switchEraser {
            let currentBlend = self.brush.blendMode
            if currentBlend != .clear {
                self.brush.blendMode = .clear
            } else {
                self.brush.blendMode = .normal
            }
        } else if preference == .switchPrevious {
            self.brush = self.previousBrush
        }
    }
}

extension SwiftyDrawView.DrawItem: Codable {
    public init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        
        let pathData = try container.decode(Data.self, forKey: .path)
        let uiBezierPath = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(pathData) as! UIBezierPath
        path = uiBezierPath.cgPath as! CGMutablePath
    
        brush = try container.decode(Brush.self, forKey: .brush)
        isFillPath = try container.decode(Bool.self, forKey: .isFillPath)
    }
    
    public func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)
        
        let uiBezierPath = UIBezierPath(cgPath: path)
        var pathData: Data?
        if #available(iOS 11.0, *) {
            pathData = try NSKeyedArchiver.archivedData(withRootObject: uiBezierPath, requiringSecureCoding: false)
        } else {
            pathData = NSKeyedArchiver.archivedData(withRootObject: uiBezierPath)
        }
        try container.encode(pathData!, forKey: .path)
        
        try container.encode(brush, forKey: .brush)
        try container.encode(isFillPath, forKey: .isFillPath)
    }
    
    enum CodingKeys: String, CodingKey {
        case brush
        case path
        case isFillPath
    }
}


================================================
FILE: SwiftyDraw/Info.plist
================================================
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>CFBundleDevelopmentRegion</key>
	<string>$(DEVELOPMENT_LANGUAGE)</string>
	<key>CFBundleExecutable</key>
	<string>$(EXECUTABLE_NAME)</string>
	<key>CFBundleIdentifier</key>
	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
	<key>CFBundleInfoDictionaryVersion</key>
	<string>6.0</string>
	<key>CFBundleName</key>
	<string>$(PRODUCT_NAME)</string>
	<key>CFBundlePackageType</key>
	<string>FMWK</string>
	<key>CFBundleShortVersionString</key>
	<string>1.0</string>
	<key>CFBundleVersion</key>
	<string>$(CURRENT_PROJECT_VERSION)</string>
</dict>
</plist>


================================================
FILE: SwiftyDraw/SwiftyDraw.h
================================================
//
//  SwiftyDraw.h
//  SwiftyDraw
//
//  Created by Shunzhe Ma on 2/6/19.
//

#import <UIKit/UIKit.h>

//! Project version number for SwiftyDraw.
FOUNDATION_EXPORT double SwiftyDrawVersionNumber;

//! Project version string for SwiftyDraw.
FOUNDATION_EXPORT const unsigned char SwiftyDrawVersionString[];

// In this header, you should import all the public headers of your framework using statements like #import <SwiftyDraw/PublicHeader.h>




================================================
FILE: SwiftyDraw.podspec
================================================

Pod::Spec.new do |s|
  s.name             = 'SwiftyDraw'
  s.version          = '2.4.1'
  s.summary          = 'A simple, core graphics drawing framework written in Swift'

  s.description      = <<-DESC
  SwiftyDraw is a simple drawing framework written in Swift. SwiftyDraw is built using Core Gaphics and is very easy to implement
                       DESC

  s.homepage         = 'https://github.com/Awalz/SwiftyDraw'
  s.license          = { :type => 'MIT', :file => 'LICENSE' }
  s.author           = { 'Linus Geffarth' => 'hello@ogli.codes' }
  s.source           = { :git => 'https://github.com/Awalz/SwiftyDraw.git', :tag => s.version }
  s.social_media_url = ''

  s.ios.deployment_target = '9.0'
  s.swift_version = '5.0'

  s.source_files = 'Source/**/*'

  s.frameworks = 'UIKit'

end


================================================
FILE: SwiftyDraw.xcodeproj/project.pbxproj
================================================
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FILE: SwiftyDraw.xcodeproj/project.xcworkspace/contents.xcworkspacedata
================================================
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================================================
FILE: SwiftyDraw.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
================================================
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================================================
FILE: SwiftyDraw.xcodeproj/xcshareddata/xcschemes/SwiftyDraw.xcscheme
================================================
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FILE: SwiftyDraw.xcodeproj/xcuserdata/shunzhema.xcuserdatad/xcschemes/xcschememanagement.plist
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================================================
FILE: SwiftyDrawExample/.gitignore
================================================
# OS X
.DS_Store

# Xcode
build/
*.pbxuser
!default.pbxuser
*.mode1v3
!default.mode1v3
*.mode2v3
!default.mode2v3
*.perspectivev3
!default.perspectivev3
xcuserdata/
*.xccheckout
profile
*.moved-aside
DerivedData
*.hmap
*.ipa

# Bundler
.bundle

# Add this line if you want to avoid checking in source code from Carthage dependencies.
# Carthage/Checkouts

Carthage/Build

# We recommend against adding the Pods directory to your .gitignore. However
# you should judge for yourself, the pros and cons are mentioned at:
# http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control
# 
# Note: if you ignore the Pods directory, make sure to uncomment
# `pod install` in .travis.yml
#
# Pods/


================================================
FILE: SwiftyDrawExample/SwiftyDrawExample/AppDelegate.swift
================================================
import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        return true
    }

    func applicationWillResignActive(_ application: UIApplication) {  }

    func applicationDidEnterBackground(_ application: UIApplication) {  }

    func applicationWillEnterForeground(_ application: UIApplication) {  }

    func applicationDidBecomeActive(_ application: UIApplication) {  }

    func applicationWillTerminate(_ application: UIApplication) {  }
}



================================================
FILE: SwiftyDrawExample/SwiftyDrawExample/Assets.xcassets/AppIcon.appiconset/Contents.json
================================================
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      "scale" : "3x"
    },
    {
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      "size" : "60x60",
      "scale" : "2x"
    },
    {
      "idiom" : "iphone",
      "size" : "60x60",
      "scale" : "3x"
    },
    {
      "idiom" : "ios-marketing",
      "size" : "1024x1024",
      "scale" : "1x"
    }
  ],
  "info" : {
    "version" : 1,
    "author" : "xcode"
  }
}

================================================
FILE: SwiftyDrawExample/SwiftyDrawExample/Base.lproj/LaunchScreen.storyboard
================================================
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================================================
FILE: SwiftyDrawExample/SwiftyDrawExample/Base.lproj/Main.storyboard
================================================
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                                    </stackView>
                                </subviews>
                            </stackView>
                            <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" alignment="bottom" translatesAutoresizingMaskIntoConstraints="NO" id="KOY-Z9-BOV">
                                <rect key="frame" x="131" y="68" width="239" height="221"/>
                                <subviews>
                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="HvD-af-j12">
                                        <rect key="frame" x="176" y="0.0" width="63" height="30"/>
                                        <state key="normal" title="undo last"/>
                                        <connections>
                                            <action selector="undo" destination="BYZ-38-t0r" eventType="touchUpInside" id="lSE-z7-GXx"/>
                                        </connections>
                                    </button>
                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="5W0-QH-ugr">
                                        <rect key="frame" x="179" y="30" width="60" height="30"/>
                                        <state key="normal" title="redo last"/>
                                        <connections>
                                            <action selector="redo" destination="BYZ-38-t0r" eventType="touchUpInside" id="zhT-4A-xVW"/>
                                        </connections>
                                    </button>
                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="4iX-SS-q0C" userLabel="spacing view">
                                        <rect key="frame" x="238" y="60" width="1" height="20"/>
                                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                        <constraints>
                                            <constraint firstAttribute="width" constant="1" id="nN9-zi-Xoc"/>
                                            <constraint firstAttribute="height" constant="20" id="wuh-nE-lHr"/>
                                        </constraints>
                                    </view>
                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="p8A-ij-1ZV">
                                        <rect key="frame" x="137" y="80" width="102" height="30"/>
                                        <state key="normal" title="activate eraser"/>
                                        <connections>
                                            <action selector="toggleEraser" destination="BYZ-38-t0r" eventType="touchUpInside" id="K1M-gE-mXI"/>
                                        </connections>
                                    </button>
                                    <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="bordered" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="Y2m-U0-61l" userLabel="Draw Mode">
                                        <rect key="frame" x="0.0" y="110" width="239" height="32"/>
                                        <segments>
                                            <segment title="draw"/>
                                            <segment title="line"/>
                                            <segment title="ellipse"/>
                                            <segment title="rect"/>
                                        </segments>
                                        <color key="selectedSegmentTintColor" white="0.66666666666666663" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                        <userDefinedRuntimeAttributes>
                                            <userDefinedRuntimeAttribute type="number" keyPath="cornerRadius">
                                                <real key="value" value="0.0"/>
                                            </userDefinedRuntimeAttribute>
                                        </userDefinedRuntimeAttributes>
                                        <connections>
                                            <action selector="setDrawMode" destination="BYZ-38-t0r" eventType="valueChanged" id="e65-uL-mSh"/>
                                        </connections>
                                    </segmentedControl>
                                    <button hidden="YES" opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="daf-Np-eua" userLabel="Fill Mode Button">
                                        <rect key="frame" x="54" y="141" width="117" height="0.0"/>
                                        <state key="normal" title="activate fill mode"/>
                                        <connections>
                                            <action selector="toggleStraightLine" destination="BYZ-38-t0r" eventType="touchUpInside" id="voc-cU-tG9"/>
                                        </connections>
                                    </button>
                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="K8j-Iq-kHk" userLabel="spacing view">
                                        <rect key="frame" x="170" y="141" width="1" height="20"/>
                                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                        <constraints>
                                            <constraint firstAttribute="height" constant="20" id="BYC-lO-dZb"/>
                                            <constraint firstAttribute="width" constant="1" id="V7g-CM-sYq"/>
                                        </constraints>
                                    </view>
                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="esB-7f-w8W">
                                        <rect key="frame" x="85" y="161" width="86" height="30"/>
                                        <state key="normal" title="clear canvas"/>
                                        <connections>
                                            <action selector="clearCanvas" destination="BYZ-38-t0r" eventType="touchUpInside" id="U2m-A5-dvl"/>
                                        </connections>
                                    </button>
                                </subviews>
                            </stackView>
                        </subviews>
                        <color key="backgroundColor" red="0.96470588239999999" green="0.96470588239999999" blue="0.96470588239999999" alpha="1" colorSpace="calibratedRGB"/>
                        <constraints>
                            <constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="fna-t5-PmT" secondAttribute="bottom" constant="24" id="MV5-Jq-Qvr"/>
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                        </constraints>
                    </view>
                    <connections>
                        <outlet property="drawModeSelector" destination="Y2m-U0-61l" id="9nI-Pd-gyo"/>
                        <outlet property="drawView" destination="Jqo-l8-EIq" id="1LA-Mx-mEv"/>
                        <outlet property="eraserButton" destination="p8A-ij-1ZV" id="kce-EN-Pni"/>
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                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="137.68844221105527" y="133.81294964028777"/>
        </scene>
    </scenes>
</document>


================================================
FILE: SwiftyDrawExample/SwiftyDrawExample/Extensions.swift
================================================
//
//  Extensions.swift
//  SwiftyDrawExample
//
//  Created by Linus Geffarth on 22.02.19.
//  Copyright © 2019 Walzy. All rights reserved.
//

import UIKit

@IBDesignable
extension UIView {
    @IBInspectable var cornerRadius: CGFloat {
        set { layer.cornerRadius = newValue }
        get { return layer.cornerRadius }
    }
    
    @IBInspectable var borderColor: UIColor {
        set { layer.borderColor = newValue.cgColor }
        get { return UIColor(cgColor: layer.borderColor!) }
    }
    
    @IBInspectable var borderWidth: CGFloat {
        set { layer.borderWidth = newValue }
        get { return layer.borderWidth }
    }
}

extension CGMutablePath {
    func adding(path: CGPath) -> CGMutablePath {
        addPath(path)
        return self
    }
}


================================================
FILE: SwiftyDrawExample/SwiftyDrawExample/Info.plist
================================================
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>CFBundleDevelopmentRegion</key>
	<string>en</string>
	<key>CFBundleExecutable</key>
	<string>$(EXECUTABLE_NAME)</string>
	<key>CFBundleIdentifier</key>
	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
	<key>CFBundleInfoDictionaryVersion</key>
	<string>6.0</string>
	<key>CFBundleName</key>
	<string>$(PRODUCT_NAME)</string>
	<key>CFBundlePackageType</key>
	<string>APPL</string>
	<key>CFBundleShortVersionString</key>
	<string>1.0</string>
	<key>CFBundleVersion</key>
	<string>1</string>
	<key>LSRequiresIPhoneOS</key>
	<true/>
	<key>UILaunchStoryboardName</key>
	<string>LaunchScreen</string>
	<key>UIMainStoryboardFile</key>
	<string>Main</string>
	<key>UIRequiredDeviceCapabilities</key>
	<array>
		<string>armv7</string>
	</array>
	<key>UIRequiresFullScreen</key>
	<true/>
	<key>UISupportedInterfaceOrientations</key>
	<array>
		<string>UIInterfaceOrientationPortrait</string>
		<string>UIInterfaceOrientationLandscapeLeft</string>
		<string>UIInterfaceOrientationLandscapeRight</string>
	</array>
</dict>
</plist>


================================================
FILE: SwiftyDrawExample/SwiftyDrawExample/SwiftyDrawExample.entitlements
================================================
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>com.apple.security.app-sandbox</key>
	<true/>
	<key>com.apple.security.network.client</key>
	<true/>
</dict>
</plist>


================================================
FILE: SwiftyDrawExample/SwiftyDrawExample/ViewController.swift
================================================
import UIKit

extension ViewController: SwiftyDrawViewDelegate {
    func swiftyDraw(shouldBeginDrawingIn drawingView: SwiftyDrawView, using touch: UITouch) -> Bool { return true }
    func swiftyDraw(didBeginDrawingIn    drawingView: SwiftyDrawView, using touch: UITouch) { updateHistoryButtons() }
    func swiftyDraw(isDrawingIn          drawingView: SwiftyDrawView, using touch: UITouch) {  }
    func swiftyDraw(didFinishDrawingIn   drawingView: SwiftyDrawView, using touch: UITouch) {  }
    func swiftyDraw(didCancelDrawingIn   drawingView: SwiftyDrawView, using touch: UITouch) {  }
}

class ViewController: UIViewController {
    
    @IBOutlet weak var drawView: SwiftyDrawView!
    @IBOutlet weak var eraserButton: UIButton!
    @IBOutlet weak var fillModeButton: UIButton!
    @IBOutlet weak var drawModeSelector: UISegmentedControl!
    
    @IBOutlet weak var undoButton: UIButton!
    @IBOutlet weak var redoButton: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        updateHistoryButtons()
        
        drawView.delegate = self
        drawView.brush.width = 7
        
        if #available(iOS 9.1, *) {
            drawView.allowedTouchTypes = [.finger, .pencil]
        }
    }
    
    @IBAction func selectedColor(_ button: UIButton) {
        guard let color = button.backgroundColor else { return }
        drawView.brush.color = Color(color)
        deactivateEraser()
    }
    
    @IBAction func undo() {
        drawView.undo()
        updateHistoryButtons()
    }
    
    @IBAction func redo() {
        drawView.redo()
        updateHistoryButtons()
    }
    
    func updateHistoryButtons() {
        undoButton.isEnabled = drawView.canUndo
        redoButton.isEnabled = drawView.canRedo
    }
    
    @IBAction func toggleEraser() {
        if drawView.brush.blendMode == .normal {
            //Switch to clear
            activateEraser()
        } else {
            //Switch to normal
            deactivateEraser()
        }
    }
    
    @IBAction func clearCanvas() {
        drawView.clear()
        deactivateEraser()
    }
    
    @IBAction func setDrawMode() {
        switch (drawModeSelector.selectedSegmentIndex) {
        case 1:
            drawView.drawMode = .line
            fillModeButton.isHidden = true
            break
        case 2:
            drawView.drawMode = .ellipse
            fillModeButton.isHidden = false
            break
        case 3:
            drawView.drawMode = .rect
            fillModeButton.isHidden = false
            break
        default:
            drawView.drawMode = .draw
            fillModeButton.isHidden = true
            break
        }
    }
    
    @IBAction func toggleStraightLine() {
        drawView.shouldFillPath = !drawView.shouldFillPath
        if (drawView.shouldFillPath) {
            fillModeButton.tintColor = .red
            fillModeButton.setTitle("activate stroke mode", for: .normal)
        } else {
            fillModeButton.tintColor = self.view.tintColor
            fillModeButton.setTitle("activate fill mode", for: .normal)
        }
    }
        
    @IBAction func changedWidth(_ slider: UISlider) {
        drawView.brush.width = CGFloat(slider.value)
    }
    
    @IBAction func changedOpacity(_ slider: UISlider) {
        drawView.brush.opacity = CGFloat(slider.value)
        deactivateEraser()
    }
    
    func activateEraser() {
        drawView.brush.blendMode = .clear
        eraserButton.tintColor = .red
        eraserButton.setTitle("deactivate eraser", for: .normal)
    }
    
    func deactivateEraser() {
        drawView.brush.blendMode = .normal
        eraserButton.tintColor = self.view.tintColor
        eraserButton.setTitle("activate eraser", for: .normal)
    }
}



================================================
FILE: SwiftyDrawExample/SwiftyDrawExample.xcodeproj/project.pbxproj
================================================
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