spb/prisme Public MIT

1//2//  PrismMark.swift3//  Prisme4//5//  Author: Simon-Pierre Boucher <contact@spboucher.ai>6//78import SwiftUI910/// The Prisme logo, drawn in code so it adapts to light/dark and any size.11/// Same geometry as the app icon (Design/icon/prisme-icon.svg): a white beam12/// enters a glass prism and exits as a spectrum fan.13struct PrismMark: View {14    var body: some View {15        Canvas { context, size in16            let s = min(size.width, size.height) / 10241718            func point(_ x: CGFloat, _ y: CGFloat) -> CGPoint {19                CGPoint(x: x * s, y: y * s)20            }21            func polygon(_ pts: [(CGFloat, CGFloat)]) -> Path {22                var path = Path()23                path.move(to: point(pts[0].0, pts[0].1))24                for p in pts.dropFirst() { path.addLine(to: point(p.0, p.1)) }25                path.closeSubpath()26                return path27            }2829            // Spectrum fan (clipped by the canvas, like the icon).30            let origin: (CGFloat, CGFloat) = (614, 470)31            let boundaries: [(CGFloat, CGFloat)] = [32                (1211, 248), (1238, 348), (1250, 451),33                (1244, 555), (1223, 657), (1185, 753), (1132, 843),34            ]35            let colors: [Color] = [36                Color(red: 1.00, green: 0.23, blue: 0.36),37                Color(red: 1.00, green: 0.62, blue: 0.11),38                Color(red: 1.00, green: 0.88, blue: 0.40),39                Color(red: 0.24, green: 0.86, blue: 0.52),40                Color(red: 0.22, green: 0.71, blue: 1.00),41                Color(red: 0.55, green: 0.36, blue: 0.96),42            ]43            for (index, color) in colors.enumerated() {44                let band = polygon([origin, boundaries[index], boundaries[index + 1]])45                context.fill(band, with: .color(color.opacity(0.95)))46            }4748            // Incoming beam, stopping on the left face. Light stays white in49            // both color schemes; a soft shadow keeps it visible on light50            // backgrounds.51            let beam = polygon([(82, 132), (142, 98), (398, 488), (372, 510)])52            context.drawLayer { layer in53                layer.addFilter(.shadow(color: .black.opacity(0.22), radius: 7 * s, y: 2 * s))54                layer.fill(beam, with: .color(.white))55            }56            context.stroke(beam, with: .color(.black.opacity(0.10)), lineWidth: 2 * s)5758            // Internal refraction.59            let inner = polygon([(386, 494), (614, 462), (614, 478), (390, 508)])60            context.fill(inner, with: .color(.white.opacity(0.9)))61            context.stroke(inner, with: .color(.black.opacity(0.08)), lineWidth: 1.5 * s)6263            // Glass triangle.64            let prism = polygon([(512, 268), (292, 688), (732, 688)])65            context.fill(prism, with: .color(.primary.opacity(0.07)))66            context.stroke(67                prism,68                with: .color(.primary.opacity(0.75)),69                style: StrokeStyle(lineWidth: 10 * s, lineCap: .round, lineJoin: .round)70            )71        }72    }73}7475#Preview {76    PrismMark()77        .frame(width: 160, height: 160)78        .padding()79}80