Swift Graphics

2D drawing library for Swift with multiple backends, currently including

• Cairo (cross-platform)
• Core Graphics (Apple platforms)

Example

import PlatformGraphics
import Utils

// Create a new image and a graphics context
let ctx = try PlatformGraphicsContext(width: 300, height: 300)

// Draw some shapes
ctx.draw(line: LineSegment(fromX: 20, y: 20, toX: 50, y: 30))
ctx.draw(rect: Rectangle(fromX: 80, y: 90, width: 10, height: 40, color: Colors.yellow))
ctx.draw(text: Text("Test", at: Vec2(x: 0, y: 15)))
ctx.draw(ellipse: Ellipse(centerX: 150, y: 80, radius: 40))
ctx.draw(polygon: Polygon(points: [
    Vec2(x: 210.0, y: 150.0),
    Vec2(x: 100.0, y: 200.0),
    Vec2(x: 170.0, y: 250.0)
], isFilled: false))

// Encode the image to a byte buffer
let image = try ctx.makeImage()
let data = try image.pngEncoded()

The full example can be found in Snippets/DrawShapes.swift. To run it, invoke

swift run DrawShapes Output/shapes.png

The resulting PNG will be written to Output/shapes.png.

System Dependencies

• Swift 5.7+
• For the Cairo backend (required on Linux, optional on macOS):
  • Debian: apt-get install libcairo2-dev
  • macOS: brew install cairo

Building

swift build

Testing

swift test