I hope this is an ID: FB15716546

Those circles are defined in brown noise random positions and sizes, but generated PDF has visible grid, many circles are became elipses. Smallest circle in picture has size 1pt x 1pt.

Instead of using GeometryReader and SwiftUI structs for dot shape, I used Canvas and draw paths into its context

For now like this, in a simplest way struct ContentView: View { @ObservedObject var manager = Manager() var body: some View { ... VStack { ScrollView([.horizontal, .vertical]) { DotTestView(dots: $manager.dots) .frame(width: manager.size.width, height: manager.size.height) } HStack { Button(action: { Task { await manager.updateDots(in: manager.size) }}, label: {Text("start")}) Button(action: { print ("stop")}, label: {Text("How to Stop")}) } } ... } } Manager keeps all configuration data, has @Published var dots:[Dot]. Simple as that. And a problem is that Rainbow Wheel does not allow me to touch any Button. I suspect: @MainActor public struct DotGenerator {....} but I don't know how to make it different way in Swift6

Bindings in superview was defined inside body.