Area Chart

// Area Chart · syxUI · https://syxui.dev/components/chart-area
// Free in any project. Keep this line and credit syxUI where a person can read it.

import SwiftUI

extension View {
    func formaCard(_ pad: CGFloat = 18) -> some View {
        self.padding(pad)
            .background(Color(.systemBackground), in: RoundedRectangle(cornerRadius: 20, style: .continuous))
            .overlay(RoundedRectangle(cornerRadius: 20, style: .continuous).stroke(Color.primary.opacity(0.06), lineWidth: 1))
            .shadow(color: .black.opacity(0.05), radius: 14, x: 0, y: 6)
    }
}

struct CardHeader: View {
    let label: String; let value: String; var trend: String? = nil
    var body: some View {
        HStack(alignment: .firstTextBaseline) {
            VStack(alignment: .leading, spacing: 3) {
                Text(label).font(.system(size: 13, weight: .medium)).foregroundStyle(.secondary)
                Text(value).font(.system(size: 26, weight: .bold))
            }
            Spacer()
            if let trend {
                Text(trend).font(.system(size: 12, weight: .semibold))
                    .padding(.horizontal, 8).padding(.vertical, 3)
                    .background(Color.primary.opacity(0.06), in: Capsule())
            }
        }
    }
}
// 3. Area chart (two series)
struct AreaChartCard: View {
    let a: [Double] = [0.4, 0.5, 0.45, 0.62, 0.58, 0.75, 0.7]
    let b: [Double] = [0.2, 0.28, 0.24, 0.35, 0.3, 0.42, 0.38]
    var body: some View {
        VStack(alignment: .leading, spacing: 14) {
            CardHeader(label: "Sessions", value: "12.4k")
            GeometryReader { geo in
                let w = geo.size.width, h = geo.size.height
                let mk: ([Double]) -> [CGPoint] = { vals in
                    vals.enumerated().map { i, v in CGPoint(x: w * CGFloat(i) / CGFloat(vals.count - 1), y: h * (1 - CGFloat(v))) }
                }
                let pa = mk(a), pb = mk(b)
                ZStack {
                    Path { p in p.move(to: CGPoint(x: 0, y: h)); pa.forEach { p.addLine(to: $0) }; p.addLine(to: CGPoint(x: w, y: h)); p.closeSubpath() }
                        .fill(Color.primary.opacity(0.10))
                    Path { p in p.move(to: pa[0]); pa.dropFirst().forEach { p.addLine(to: $0) } }.stroke(Color.primary, lineWidth: 2)
                    Path { p in p.move(to: pb[0]); pb.dropFirst().forEach { p.addLine(to: $0) } }.stroke(Color.primary.opacity(0.35), style: .init(lineWidth: 2, dash: [4, 4]))
                }
            }
            .frame(height: 96)
        }
        .formaCard()
    }
}