Candlestick Chart

// Candlestick Chart · syxUI · https://syxui.dev/components/chart-candles
// 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())
            }
        }
    }
}
// 8. Candlestick
struct CandlestickCard: View {
    let candles: [(Double, Double, Double, Double)] = [
        (0.4, 0.6, 0.35, 0.55), (0.55, 0.7, 0.5, 0.52), (0.52, 0.58, 0.4, 0.45),
        (0.45, 0.5, 0.3, 0.48), (0.48, 0.72, 0.45, 0.68), (0.68, 0.8, 0.6, 0.62),
        (0.62, 0.66, 0.5, 0.58), (0.58, 0.9, 0.55, 0.85)]
    var body: some View {
        VStack(alignment: .leading, spacing: 14) {
            CardHeader(label: "AAPL", value: "$237.61", trend: "+1.07%")
            GeometryReader { g in
                let h = g.size.height
                HStack(alignment: .bottom, spacing: 8) {
                    ForEach(candles.indices, id: \.self) { i in
                        let c = candles[i]; let up = c.3 >= c.0
                        ZStack {
                            Rectangle().fill(Color.primary.opacity(0.4)).frame(width: 1.5, height: h * (c.1 - c.2))
                                .offset(y: -h * (min(c.0, c.3) - c.2) + h * (max(c.0, c.3) - min(c.0, c.3)) / 2 - h * (c.1 - max(c.0, c.3)))
                            RoundedRectangle(cornerRadius: 1).fill(up ? Color.primary : Color.primary.opacity(0.28))
                                .frame(width: 7, height: max(3, h * abs(c.3 - c.0)))
                        }
                        .frame(maxHeight: .infinity, alignment: .bottom)
                        .offset(y: -h * min(c.0, c.3))
                    }
                }
            }
            .frame(height: 90)
        }
        .formaCard()
    }
}