This is a scaling static pie chart - use as starter code for your project. This is based on the code in [App Coda's tutorial](https://www.appcoda.com/swiftui-pie-chart/) but it scales into whatever frame it is in rather than having hard coded center and radius. I've also changed the clockwise parameter to false to allow for logical building.

ScalingStaticPieChart.swift

import SwiftUI


struct ScalingStaticPieChart: View {
    var body: some View {
        GeometryReader { geometry in
            let gc = geometry.size.width * 0.5
            let gcenter = CGPoint(x: gc, y: gc)
            let outsize = geometry.size.width * 0.4
        ZStack {
            Path { path in
                path.move(to: gcenter)
                path.addArc(center: .init (x: gc, y: gc), radius: outsize, startAngle: Angle(degrees: 0.0), endAngle: Angle(degrees: 110), clockwise: false)
            }
            .fill(Color(.systemYellow))
         
            Path { path in
                path.move(to: gcenter)
                path.addArc(center: gcenter, radius: outsize, startAngle: Angle(degrees: 110), endAngle: Angle(degrees: 190), clockwise: false)
            }
            .fill(Color(.systemTeal))
         
            Path { path in
                path.move(to: gcenter)
                path.addArc(center: gcenter, radius: outsize, startAngle: Angle(degrees: 190), endAngle: Angle(degrees: 290), clockwise: false)
            }
            .fill(Color(.systemBlue))
         
            Path { path in
                path.move(to: gcenter)
                path.addArc(center: gcenter, radius: outsize, startAngle: Angle(degrees: 290.0), endAngle: Angle(degrees: 360), clockwise: false)
            }
            .fill(Color(.systemPurple))
        
        }
        }
    }
}

struct ScalingStaticPieChart_Previews: PreviewProvider {
    static var previews: some View {
        ScalingStaticPieChart()
    }
}

To turn this into a donut, add another path at the end that does the whole 360 degrees.

If you use clockwise = false, you can logically go up in angle to calculate based on your values from degrees = 0 to degrees = 360