blitcurve

blitcurve is a C/C++ library for bezier curves and similar 2D geometric primitives, including common algorithms.
These mathematical objects have applications in games, animations, physical behaviors, simulations, etc.

blitcurve has a first-class Swift API for use in iOS and macOS applications. It also cross-compiles for Metal and can be used entirely on-GPU, in which case it is many orders-of-magnitude faster than alternative bezier curve approaches.

Installation

See the Installation page.

Using blitcurve

For more examples, see the Wiki and the Playgrounds directory.

Demos

Rect intersection

Intersecting rects at 4 gigaintersections/sec:

This demo is located here. For more details, see this blogpost.

Cubic drawing

24M paths per second

This demo is located here

SwiftUI

Many types embed a View type which is a SwiftUI view.

let cubic = Cubic(a: .zero, b: SIMD2<Float>(20,10),c: SIMD2<Float>(7,7),d: SIMD2<Float>(5,5))
struct Demo: View {
    var body: some View {
        ZStack {
            Cubic.View(cubic).scale(by: 5)
        }
        
    }
}

For more examples, see the Playgrounds folder.

Drawing curves

See the LineShader demo.