SwiftUI-Line.swift

struct Line: View {
    var data: [(Double)]
    @Binding var frame: CGRect

    let padding:CGFloat = 30
    
    var stepWidth: CGFloat {
        if data.count < 2 {
            return 0
        }
        return frame.size.width / CGFloat(data.count-1)
    }
    var stepHeight: CGFloat {
        var min: Double?
        var max: Double?
        let points = self.data
        if let minPoint = points.min(), let maxPoint = points.max(), minPoint != maxPoint {
            min = minPoint
            max = maxPoint
        }else {
            return 0
        }
        if let min = min, let max = max, min != max {
            if (min <= 0){
                return (frame.size.height-padding) / CGFloat(max - min)
            }else{
                return (frame.size.height-padding) / CGFloat(max + min)
            }
        }
        
        return 0
    }
    var path: Path {
        let points = self.data
        return Path.lineChart(points: points, step: CGPoint(x: stepWidth, y: stepHeight))
    }
    
    public var body: some View {
        
        ZStack {

            self.path
                .stroke(Color.green ,style: StrokeStyle(lineWidth: 3, lineJoin: .round))
                .rotationEffect(.degrees(180), anchor: .center)
                .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
                .drawingGroup()
        }
    }
}