Drawsana is a generalized framework for making freehand drawing views on iOS. You can let users scribble over images, add shapes and text, and even make your own tools.
Do you want to let your users mark up images? Are you writing a simple painting app? Drawsana might work for you!
Blog post: Let your users mark up images on iOS with Drawsana
Like what you see? Come work with us!
- Built-in tools
- Pen with line smoothing
- Eraser
- Ellipse, rect, line, arrow
- Selection
- Text
- Undo/redo
- Drawings are
Codable, so you can save and load them - Extensible—make your own shapes and tools without forking the library
Add Asana/Drawsana to your Cartfile and update your project like you would for any other
Carthage framework, or clone the source code and add the project to your workspace.
github "Asana/Drawsana" == 0.12.0
import Drawsana
class MyViewController: UIViewController {
let drawsanaView = DrawsanaView()
let penTool = PenTool()
func viewDidLoad() {
/* ... */
drawsanaView.set(tool: penTool)
drawsanaView.userSettings.strokeWidth = 5
drawsanaView.userSettings.strokeColor = .blue
drawsanaView.userSettings.fillColor = .yellow
drawsanaView.userSettings.fontSize = 24
drawsanaView.userSettings.fontName = "Marker Felt"
}
func save() {
let jsonEncoder = JSONEncoder()
jsonEncoder.outputFormatting = [.prettyPrinted, .sortedKeys]
let jsonData = try! jsonEncoder.encode(drawingView.drawing)
// store jsonData somewhere
}
func load() {
let data = // load data from somewhere
let jsonDecoder = JSONDecoder()
let drawing = try! jsonDecoder.decode(Drawing.self, from: jsonData)
drawsanaView.drawing = drawing
}
func showFinalImage() {
imageView.image = drawsanaView.render()
}
}Drawsana does not currently have a way to automatically show an image under your drawing.
We recommend that, like in the example class, you add a UIImageView underneath your
DrawsanaView and make sure your DrawsanaView's frame matches the image frame. When
it's time to get the final image, use DrawsanaView.render(over: myImage).
sudo gem install jazzy
make docs
open .docs/index.html
pip install ghp-import
make publish-docs
open https://asana.github.io/Drawsana- Undo operations are now accessible outside the framework to enable you to make undoable changes with your own UI.
AddShapeOperationRemoveShapeOperationChangeTransformOperationEditTextOperationChangeExplicitWidthOperation
- Fix drawing view not being redrawn after being resized.
- Fix bugs related to color serialization.
- Fix bugs related to text entry.
DrawingOperationStack.clearRedoStack()clears all redo operations from the redo stack.DrawingToolForShapeWithThreePointsandDrawingToolForShapeWithTwoPointsare declaredopeninstead ofpublicso they can be subclassed.PenShapenow works with the selection tool.DrawsanaView.selectionIndicatorAnchorPointOffsetallows Drawsana to keep working when you change the anchorPoint.Shape.idis now settable.- Fix bug that prevented character input of some languages, including Chinese.
- Fix bugs in gesture recognizer.
- Convert to Swift 5
- Fix
NgonShapeandTextShapeserialization bugs. Old data can't be fixed, but new data will be correct. - Deserialization error reporting is more detailed. Shapes that find a JSON object with
the correct type will now throw errors instead of causing the whole operation to silently
fail, as long as you enable
Drawing.debugSerialization. - Replacing
DrawingView.drawingnow behaves correctly instead of being unusably buggy. PenLineSegment's members are now public.ShapeTransformandPenLineSegmentare nowEquatable.
- Star, triangle, pentagon, and angle tools
DrawsanaView.render()accepts ascaleparameter instead of always using zero
- Convert to Swift 4.2
- CocoaPods support
DrawsanaView.selectionIndicatorViewShapeLayeris exposed, allowing you to more easily customize the appearance of the selection indicator- Changes to
DrawsanaView.selectionIndicatorView's style are animated in fewer cases, which more closely matches user intent - Improved text tool use in the demo app
Initial release
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