dnrops/RoughSwift

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Description

RoughSwift allows us to easily make shapes in hand drawn, sketchy, comic style in SwiftUI.

Support iOS, tvOS
Support all shapes: line, rectangle, circle, ellipse, linear path, arc, curve, polygon, svg path
Generate UIBezierPath for CAShapeLayer
Easy cusomizations with Options
Easy composable APIs
Convenient draw functions
Platform independant APIs which can easily support new platforms
Test coverage
Immutable and type safe data structure
SVG elliptical arc

There are Example project where you can explore further.

Basic

Use generator in draw function to specify which shape to render. The returned CALayer contains the rendered result in correct size and is updated everytime generator is instructed.

Here’s how to draw a green rectangle

RoughView()
    .fill(.yellow)
    .fillStyle(.hachure)
    .hachureAngle(-41)
    .hachureGap(-1)
    .fillWeight(-1)
    .stroke(.systemTeal)
    .strokeWidth(2)
    .curveTightness(0)
    .curveStepCount(9)
    .dashOffset(-1)
    .dashGap(-1)
    .zigzagOffset(-9)

The beauty of CALayer is that we can further animate, transform (translate, scale, rotate) and compose them into more powerful shapes.

Options

Options is used to custimize shape. It is immutable struct and apply to one shape at a time. The following properties are configurable

maxRandomnessOffset
toughness
bowing
fill
stroke
strokeWidth
curveTightness
curveStepCount
fillStyle
fillWeight
hachureAngle
hachureGap
dashOffset
dashGap
zigzagOffset

Shapes

RoughSwift supports all primitive shapes, including SVG path

line
rectangle
ellipse
circle
linearPath
arc
curve
polygon
path

Fill style

Most of the time, we use fill for solid fill color inside shape, stroke for shape border, and fillStyle for sketchy fill style.

Available fill styles

crossHatch
dashed
dots
hachure
solid
starBurst
zigzag
zigzagLine

Here’s how to draw circles in different fill styles. The default fill style is hachure

struct StylesView: View {
    var body: some View {
        LazyVGrid(columns: [.init(), .init(), .init()], spacing: 12) {
            RoughView()
                .fill(.red)
                .fillStyle(.crossHatch)
                .circle()
                .frame(width: 100, height: 100)

            RoughView()
                .fill(.green)
                .fillStyle(.dashed)
                .circle()
                .frame(width: 100, height: 100)

            RoughView()
                .fill(.purple)
                .fillStyle(.dots)
                .circle()
                .frame(width: 100, height: 100)

            RoughView()
                .fill(.cyan)
                .fillStyle(.hachure)
                .circle()
                .frame(width: 100, height: 100)

            RoughView()
                .fill(.orange)
                .fillStyle(.solid)
                .circle()
                .frame(width: 100, height: 100)

            RoughView()
                .fill(.gray)
                .fillStyle(.starBurst)
                .circle()
                .frame(width: 100, height: 100)

            RoughView()
                .fill(.yellow)
                .fillStyle(.zigzag)
                .circle()
                .frame(width: 100, height: 100)

            RoughView()
                .fill(.systemTeal)
                .fillStyle(.zigzagLine)
                .circle()
                .frame(width: 100, height: 100)
        }
    }
}

SVG

SVG shape can be bigger or smaller than the specifed layer size, so RoughSwift scales them to your requested size. This way we can compose and transform the SVG shape.

struct SVGView: View {
    var apple: String {
        "M85 32C115 68 239 170 281 192 311 126 274 43 244 0c97 58 146 167 121 254 28 28 40 89 29 108 -25-45-67-39-93-24C176 409 24 296 0 233c68 56 170 65 226 27C165 217 56 89 36 54c42 38 116 96 161 122C159 137 108 72 85 32z"
    }

    var body: some View {
        VStack {
            RoughView()
                .stroke(.systemTeal)
                .fill(.red)
                .draw(Path(d: apple))
                .frame(width: 300, height: 300)
        }
    }
}

Creative shapes

With all the primitive shapes, we can create more beautiful things. The only limit is your imagination.

Here’s how to create chart

struct Chartview: View {
    var heights: [CGFloat] {
        Array(0 ..< 10).map { _ in CGFloat.random(in: 0 ..< 150) }
    }

    var body: some View {
        HStack {
            ForEach(0 ..< 10) { index in
                VStack {
                    Spacer()
                    RoughView()
                        .fill(.yellow)
                        .rectangle()
                        .frame(height: heights[index])
                }
            }
        }
        .padding(.horizontal)
        .padding(.bottom, 100)
    }
}

Advance with Drawable, Generator and Renderer

Behind the screen, we composes Generator and Renderer.

We can instantiate Engine or use a shared Engine for memory efficiency, to make Generator. Every time we instruct Generator to draw a shape, the engine works hard to figure out information about the sketchy shape in Drawable.

The name of these concepts follow rough.js for better code reasoning.

For iOS, there is a Renderer that can handle Drawable and transform it into UIBezierPath and CALayer. There will be more Renderer that can render into graphics context, image and for other platforms like macOS and watchOS.

let layer = CALayer()
let size = CGSize(width: 200, heigh: 200)

let renderer = Renderer(layer: layer)
let generator = Engine.shared.generator(size: bounds.size)

let drawable: Drawable = Rectangle(x: 10, y: 10, width: 100, height: 50)
let drawing = generate.generate(drawable: drawable)

renderer.render(drawing: drawing)

Installation

Add the following line to the dependencies in your Package.swift file

.package(url: "https://github.com/onmyway133/RoughSwift"),

Author

Khoa Pham, onmyway133@gmail.com

Credit

rough for the generator that powers RoughSwift. All the hard work is done via rough in JavascriptCore.
SVGPath for constructing UIBezierPath from SVG path

Contributing

We would love you to contribute to RoughSwift, check the CONTRIBUTING file for more info.

License

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